Updated on 2024/05/13

写真a

 
KAWASAKI Takeshi
 
Organization
Graduate School of Science Lecturer
Graduate School
Graduate School of Science
Undergraduate School
School of Science Department of Physics
Title
Lecturer
Contact information
メールアドレス
External link

Degree 1

  1. Doctor (Engineering) ( 2010.3   The University of Tokyo ) 

Research Areas 3

  1. Natural Science / Biophysics, chemical physics and soft matter physics  / glass transition

  2. Natural Science / Biophysics, chemical physics and soft matter physics  / Phase transition dynamics

  3. Natural Science / Biophysics, chemical physics and soft matter physics  / Soft matter physics

Research History 6

  1. 国立研究開発法人 科学技術振興機構 JST創発研究者

    2022.4

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  2. Nagoya University   Lecturer

    2020.3

  3. Nagoya University   Department of physics,   Assistant Professor

    2015.3 - 2020.2

  4. CNRS post-doc researcher

    2013.4 - 2015.2

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  5. JSPS Fellowship (PD at Kyoto University)

    2010.4 - 2013.3

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  6. JSPS Fellowship (DC2)

    2008.4 - 2010.3

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Education 3

  1. The University of Tokyo   Graduate School, Division of Engineering   Deartment of Applied Physics

    2007.4 - 2010.3

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    Country: Japan

  2. The University of Tokyo   Graduate School, Division of Engineering   Deartment of Applied Physics

    2005.4 - 2007.3

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    Country: Japan

  3. Keio University   Faculty of Science and Engineering

    2001.4 - 2005.3

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    Country: Japan

Professional Memberships 1

  1. Japan Physical Society

Committee Memberships 3

  1. Frontiers in Physics   Associate editor (Soft Matter Physics)  

    2022.10   

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    Committee type:Other

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  2. Frontiers in Physics   Review Editor  

    2021.2   

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    Committee type:Academic society

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  3. 日本物理学会 領域12 運営委員   化学物理分野 運営委員  

    2015.10 - 2016.9   

Awards 12

  1. Faculty Teaching Awards - Institute of Liberal Arts and Sciences

    2023.3   Nagoya University ILAS  

    Takeshi Kawasaki

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  2. IOP trusted reviewer award

    2020.9   Institute of Physics (IOP)  

    Takeshi Kawasaki

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    Country:United Kingdom

  3. The MEXT Young Scientists’ Prize

    2020.4   Ministry of Education, Culture, Sports, Science and Technology  

    Takeshi Kawasaki

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    Country:Japan

  4. The 13th Condensed matter prize

    2018.11  

    Takeshi Kawasaki

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    Country:Japan

  5. Young Scientist Award (Division 12)

    2015.3   Japan Physical Society  

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    Country:Japan

  6. Best practice award for lectures

    2020.10   Nagoya University ILAS  

    Takeshi Kawasaki

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  7. Editors' suggestion (Physical Review E)

    2015.1   American Phsical Society  

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    Country:United States

  8. Best oral presentation award for junior researchers

    2014.7   MIT and GDR MiDi conference on Modeling Granular Media Across Scales  

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    Country:France

  9. Editors' choices for 2011 (The Journal of Chemical Physics)

    2011.3   American Institute of Physics  

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    Country:United States

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  10. Journal of Physics: Condensed Matter's 2010 Highlights

    2010.3   Institute of Physics  

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    Country:United Kingdom

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  11. Best presentation award for students

    2007.9   Tohoku University  

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    Country:Japan

  12. Best presentation award for students

    2007.9   The 5th International Workshop on Complex Systems  

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    Country:Japan

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Papers 64

  1. Unified understanding of nonlinear rheology near the jamming transition point Reviewed

    Takeshi Kawasaki and Kunimasa Miyazaki

    Physical Review Letters   Vol. in press   2024.5

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    Authorship:Lead author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)  

  2. Scale Separation of Shear-induced Criticality in Glasses Reviewed

    Norihiro Oyama, Takeshi Kawasaki, Kang Kim, Hideyuki Mizuno

    Phys. Rev. Lett.   Vol. 132 ( 14 ) page: 148201-1 - 148201-6   2024.3

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    Language:English   Publishing type:Research paper (scientific journal)  

  3. ソフトマター物理学に基づく,時空間病態モデルの構築: 炎症から発がんへ Invited Reviewed

    川﨑猛史

    実験医学(羊土社)よい炎症と悪い炎症,3.1 節   Vol. 印刷中   2024

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    Authorship:Lead author, Last author, Corresponding author  

  4. Anomalous Long-Range Fluctuations in Homogeneous Fluid Phase of Active Brownian Particles Reviewed

    Yuta Kuroda, Hiromichi Matsuyama, Takeshi Kawasaki, Kunimasa Miyazaki

    Physical Review Research   Vol. 5   page: 013077   2023.1

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    Language:English  

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    Other Link: https://arxiv.org/abs/2202.04436

  5. What Do Deep Neural Networks Find in Disordered Structures of Glasses? Invited Reviewed

    Norihiro Oyama, Shihori Koyama, Takeshi Kawasaki

    Frontiers in Physics   Vol. 10   page: 1007861   2023.1

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    Authorship:Last author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.3389/fphy.2022.1007861

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    Other Link: https://www.frontiersin.org/articles/10.3389/fphy.2022.1007861/full

  6. Shear-induced diffusion and dynamic heterogeneities in dense granular flows Invited Reviewed

    Kuniyasu Saitoh, Takeshi Kawasaki

    Frontiers in Physics   Vol. 10   page: 992239   2022.10

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    Authorship:Last author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:Frontiers Media SA  

    We study two-dimensional dense granular flows by molecular dynamics simulations. We quantify shear-induced diffusion of granular particles by the transverse component of particle displacements. In long time scales, the transverse displacements are described as normal diffusion and obey Gaussian distributions, where time correlations of particle velocities entirely vanish. In short time scales, the transverse displacements are strongly non-Gaussian if the system is dense and sheared quasistatically though memory effects on the particle velocities are further suppressed. We also analyze spatio-temporal structures of the transverse displacements by self-intermediate scattering functions and dynamic susceptibilities. We find that the relation between the maximum intensity and characteristic time scale for dynamic heterogeneities is dependent on the models of contact damping (which exhibit different rheological properties such as the Newtonian fluids’ behavior and shear thickening). In addition, the diffusion coefficient over the shear rate is linear (sub-linear) in the maximum of dynamic susceptibility if the damping force is not restricted (restricted) to the normal direction between the particles in contact.

    DOI: 10.3389/fphy.2022.992239

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  7. Aging or DEAD: origin of the non-monotonic behavior in active glasses Invited Reviewed

    Natsuda Klongvessa, Christophe Ybert, Cecile Cottin-Bizonne, Takeshi Kawasaki, Mathieu Leocmach

    The Journal of Chemical Physics   Vol. 156   page: 154509   2022.5

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    DOI: 10.1063/5.0087578

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  8. Distribution and Structure Analysis of Fibril-Forming Peptides Focusing on Concentration Dependency Reviewed

    Yoshitake Sakae, Takeshi Kawasaki, Yuko Okamoto

    ACS Omega   Vol. 7   page: 10012   2022.3

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:American Chemical Society (ACS)  

    DOI: 10.1021/acsomega.1c04960

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  9. Emergent elastic fields induced by topological phase transitions: Impact of molecular chirality and steric anisotropy Reviewed

    Kyohei Takae, Takeshi Kawasaki

    Proc. Natl. Acad. Sci. USA   Vol. 119   page: e2118492119   2022.3

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    Authorship:Last author   Language:English   Publishing type:Research paper (scientific journal)  

    DOI: https://doi.org/10.1073/pnas.2118492119

  10. Nonlinear rheology in dense suspensions Invited Reviewed

    Takeshi Kawasaki

    The Journal of the Society of Rheology Japan   Vol. 50 ( 1 ) page: 63 - 67   2022.2

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    Authorship:Lead author, Last author, Corresponding author   Language:Japanese   Publishing type:Research paper (scientific journal)  

    DOI: https://doi.org/10.1678/rheology.50.63

    Other Link: https://www.jstage.jst.go.jp/article/rheology/50/1/50_63/_article/-char/ja

  11. Geometrical properties of mechanically annealed systems near the jamming transition Invited Reviewed International journal

    Hiromichi Matsuyama, Mari Toyoda, Takumi Kurahashi, Atsushi Ikeda, Takeshi Kawasaki, Kunimasa Miyazaki

    The European Physical Journal E   Vol. 44   page: 133   2021.10

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  12. Dynamic Susceptibilities in Dense Soft Athermal Spheres Under a Finite-Rate Shear Invited Reviewed

    Norihiro Oyama, Takeshi Kawasaki, Kuniyasu Saitoh

    Frontiers in Physics   Vol. 9   2021.5

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Frontiers Media SA  

    The mechanical responses of dense packings of soft athermal spheres under a finite-rate shear are studied by means of molecular dynamics simulations. We investigate the volume fraction and shear rate dependence of the fluctuations in the shear stress and the interparticle contact number. In particular, we quantify them by defining the susceptibility as the ratio of the global to local fluctuations. The obtained susceptibilities form ridges on the volume fraction-shear rate plane, which are reminiscent of the Widom lines around the critical point in an equilibrium phase transition.

    DOI: 10.3389/fphy.2021.667103

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  13. Acoustic resonance in periodically sheared glass: damping due to plastic events Invited Reviewed

    Takeshi Kawasaki and Akira Onuki

    Soft Matter   Vol. 16   page: 9357   2020.8

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    Authorship:Lead author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1039/d0sm00856g

  14. Active microrheology of a bulk metallic glass Reviewed International coauthorship

    Ji Woong Yu, S. H. E. Rahbari, Takeshi Kawasaki, Hyunggyu Park, Won Bo Lee

    Science Advances   Vol. 6   page: eaba8766   2020.7

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1126/sciadv.aba8766

  15. Glass stability changes the nature of yielding under oscillatory shear Reviewed

    Wei-Ting Yeh, Misaki Ozawa, Kunimasa Miyazaki, Takeshi Kawasaki, Ludovic Berthier

    Physical Review Letters   Vol. 124   page: 225502   2020.6

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    DOI: 10.1103/PhysRevLett.124.225502

  16. Critical scaling of diffusion coefficients and size of rigid clusters of soft athermal particles under shear, Invited Reviewed

    Kuniyasu Saitoh and Takeshi Kawasaki

    Frontiers in Physics   Vol. 8   page: 99   2020.4

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    DOI: 10.3389/fphy.2020.00099

  17. Universal relaxation dynamics of sphere packings below jamming, Reviewed

    Atsushi Ikeda, Takeshi Kawasaki, Ludovic Berthier, Kuniyasu Saitoh, Takahiro Hatano

    Physical Review Letters   Vol. 124 ( 5 ) page: 058001   2020.2

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    We show that non-Brownian suspensions of repulsive spheres below jamming display a slow relaxational dynamics with a characteristic timescale that diverges at jamming. This slow timescale is fully encoded in the structure of the unjammed packing and can be readily measured via the vibrational density of states. We show that the corresponding dynamic critical exponent is the same for randomly generated and sheared packings. Our results show that a wide variety of physical situations, from suspension rheology to algorithmic studies of the jamming transition are controlled by a unique diverging timescale, with a universal critical exponent.

    DOI: 10.1103/PhysRevLett.124.058001

    DOI: 10.1103/PhysRevLett.124.058001

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  18. Local density fluctuation governs the divergence of viscosity underlying elastic and hydrodynamic anomalies in a 2D glass-forming liquid Reviewed

    Hayato Shiba, Takeshi Kawasaki, and Kang Kim

    Physical Review Letters   Vol. 123   page: 265501-1 - 265501-5   2019

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  19. Glassy dynamics of a model of bacterial cytoplasm with metabolic activities

    Norihiro Oyama, Takeshi Kawasaki, Hideyuki Mizuno, Atsushi Ikeda

    Physical Review Research   Vol. 15   page: 032038(R)   2019

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  20. Classification of the reversible-irreversible transitions in particle trajectories across the jamming transition point Reviewed

    Kentaro Nagasawa, Kunimasa Miyazaki, and Takeshi Kawasaki

    Soft Matter   Vol. 15   page: 7557   2019.9

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    DOI: 10.1039/C9SM01488H

  21. Theory of Shear Modulus in Glasses Invited

    Akira Onuki, Takeshi Kawasaki

    The Journal of Chemical Physics   Vol. 150   page: 124504   2019.3

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    DOI: 10.1063/1.5082154

  22. Slow dynamics coupled with cluster formation in ultrasoft-potential glasses

    Ryoji Miyazaki, Takeshi Kawasaki and Kunimasa Miyazaki

    The Journal of Chemical Physics   Vol. 150   page: 074503   2019.2

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    DOI: 10.1063/1.5086379

  23. Classification of mobile- and immobile-molecule timescales for the Stokes-Einstein and Stokes-Einstein-Debye relations in supercooled water

    Takeshi Kawasaki, Kang Kim

    Journal of Statistical Mechanics: Theory and Experiment   Vol. 2019   page: 084004   2019

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    DOI: 10.1088/1742-5468/ab3114

  24. Discontinuous shear thickening in Brownian suspension Reviewed

    Takeshi Kawasaki, Ludovic Berthier

    Physical Review E   Vol. 98   page: 012609   2018.7

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    DOI: 10.1103/PhysRevE.98.012609

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  25. Excitation of vibrational soft modes in disordered systems using active oscillation Invited Reviewed

    Elsen Tjhung, Takeshi Kawasaki

    SOFT MATTER   Vol. 13 ( 1 ) page: 111 - 118   2017.1

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:ROYAL SOC CHEMISTRY  

    We propose a new method to characterize the spatial distribution of particles' vibrations in solids with much lower computational costs compared to the usual normal mode analysis. We excite the specific vibrational mode in a two dimensional athermal jammed system by giving a small amplitude of active oscillation to each particle's size with an identical driving frequency. The response is then obtained as the real time displacements of the particles. We show remarkable correlations between the real time displacements and the eigen vectors obtained from conventional normal mode analysis. More importantly, from these real time displacements, we can measure the participation ratio and spatial polarization of particles' vibrations. From these measurements, we find three distinct frequency regimes which characterize the spatial distribution and correlation of particles' vibrations in jammed amorphous solids. Furthermore, we can possibly apply this method to a much larger system to examine the low frequency behaviour of amorphous solids with a much higher resolution of the frequency space.

    DOI: 10.1039/c6sm00788k

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  26. Spurious violation of the Stokes-Einstein-Debye relation in supercooled water

    Takeshi Kawasaki, Kang Kim

    Scientific Reports   Vol. 9   page: 8118   2019.5

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    DOI: 8118

  27. Prediction and classification in equation-free collective motion dynamics Reviewed International journal

    Keisuke Fujii, Takeshi Kawasaki, Yuki Inaba, Yoshinobu Kawahara

    PLOS Computational Biology   Vol. 14 ( 11 ) page: e1006545   2018.11

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    Modeling the complex collective behavior is a challenging issue in several material and life sciences. The collective motion has been usually modeled by simple interaction rules and explained by global statistics. However, it remains difficult to bridge the gap between the dynamic properties of the complex interaction and the emerging group-level functions. Here we introduce decomposition methods to directly extract and classify the latent global dynamics of nonlinear dynamical systems in an equation-free manner, even including complex interaction in few data dimensions. We first verified that the basic decomposition method can extract and discriminate the dynamics of a well-known rule-based fish-schooling (or bird-flocking) model. The method extracted different temporal frequency modes with spatial interaction coherence among three distinct emergent motions, whereas these wave properties in multiple spatiotemporal scales showed similar dispersion relations. Second, we extended the basic method to map high-dimensional feature space for application to actual small-dimensional systems complexly changing the interaction rules. Using group sports human data, we classified the dynamics and predicted the group objective achievement. Our methods have a potential for classifying collective motions in various domains which obey in non-trivial dominance law known as active matters.

    DOI: 10.1371/journal.pcbi.1006545

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  28. Isolating long-wavelength fluctuation from structural relaxation in two-dimensional glass: Cage-relative displacement Invited Reviewed

    Hayato Shiba, Peter Keim, Takeshi Kawasaki

    Journal of Physics Condensed Matter   Vol. 30 ( 9 ) page: 094004   2018.2

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    It has recently been revealed that long-wavelength fluctuation exists in two-dimensional (2D) glassy systems, having the same origin as that given by the Mermin-Wagner theorem for 2D crystalline solids. In this paper, we discuss how to characterise quantitatively the long-wavelength fluctuation in a molecular dynamics simulation of a lightly supercooled liquid. We employ the cage-relative mean-square displacement (MSD), defined on relative displacement to its cage, to quantitatively separate the long-wavelength fluctuation from the original MSD. For increasing system size the amplitude of acoustic long wavelength fluctuations not only increases but shifts to later times causing a crossover with structural relaxation of caging particles. We further analyse the dynamic correlation length using the cage-relative quantities. It grows as the structural relaxation becomes slower with decreasing temperature, uncovering an overestimation by the four-point correlation function due to the long-wavelength fluctuation. These findings motivate the usage of cage-relative MSD as a starting point for analysis of 2D glassy dynamics.

    DOI: 10.1088/1361-648X/aaa8b8

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  29. Unveiling Dimensionality Dependence of Glassy Dynamics: 2D Infinite Fluctuation Eclipses Inherent Structural Relaxation Reviewed

    Hayato Shiba, Yasunori Yamada, Takeshi Kawasaki, Kang Kim

    PHYSICAL REVIEW LETTERS   Vol. 117 ( 24 ) page: 245701   2016.12

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    By using large-scale molecular dynamics simulations, the dynamics of two-dimensional (2D) supercooled liquids turns out to be dependent on the system size, while the size dependence is not pronounced in three-dimensional (3D) systems. It is demonstrated that the strong system-size effect in 2D amorphous systems originates from the enhanced fluctuations at long wavelengths which are similar to those of 2D crystal phonons. This observation is further supported by the frequency dependence of the vibrational density of states, consisting of the Debye approximation in the low-wave-number limit. However, the system-size effect in the intermediate scattering function becomes negligible when the length scale is larger than the vibrational amplitude. This suggests that the finite-size effect in a 2D system is transient and also that the structural relaxation itself is not fundamentally different from that in a 3D system. In fact, the dynamic correlation lengths estimated from the bond-breakage function, which do not suffer from those enhanced fluctuations, are not size dependent in either 2D or 3D systems.

    DOI: 10.1103/PhysRevLett.117.245701

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  30. Macroscopic yielding in jammed solids is accompanied by a nonequilibrium first-order transition in particle trajectories Reviewed

    Takeshi Kawasaki, Ludovic Berthier

    PHYSICAL REVIEW E   Vol. 94 ( 2 ) page: 022615-1 - 022615-6   2016.8

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    We use computer simulations to analyze the yielding transition during large-amplitude oscillatory shear of a simple model for soft jammed solids. Simultaneous analysis of global mechanical response and particle-scale motion demonstrates that macroscopic yielding, revealed by a smooth crossover in mechanical properties, is accompanied by a sudden change in the particle dynamics, which evolves from nondiffusive motion to irreversible diffusion as the amplitude of the shear is increased. We provide numerical evidence that this sharp change corresponds to a nonequilibrium first-order dynamic phase transition, thus establishing the existence of a well-defined microscopic dynamic signature of the yielding transition in amorphous materials in oscillatory shear.

    DOI: 10.1103/PhysRevE.94.022615

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  31. Identifying time scales for violation/preservation of Stokes-Einstein relation in supercooled water Reviewed

    Takeshi Kawasaki, Kang Kim

    SCIENCE ADVANCES   Vol. 3 ( 8 ) page: e1700399   2017.8

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    Authorship:Lead author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:AMER ASSOC ADVANCEMENT SCIENCE  

    The violation of the Stokes-Einstein (SE) relation D similar to (h/T)(-1) between the shear viscosity h and the translational diffusion constant D at temperature T is of great importance for characterizing anomalous dynamics of supercooled water. Determining which time scales play key roles in the SE violation remains elusive without the measurement of h. We provide comprehensive simulation results of the dynamic properties involving h and D in the TIP4P/2005 supercooled water. This enabled the thorough identification of the appropriate time scales for the SE relation Dh/T. In particular, it is demonstrated that the temperature dependence of various time scales associated with structural relaxation, hydrogen bond breakage, stress relaxation, and dynamic heterogeneities can be definitely classified into only two classes. That is, we propose the generalized SE relations that exhibit "violation" or "preservation." The classification depends on the examined time scales that are coupled or decoupled with the diffusion. On the basis of the classification, we explain the physical origins of the violation in terms of the increase in the plateau modulus and the nonexponentiality of stress relaxation. This implies that the mechanism of SE violation is attributed to the attained solidity upon supercooling, which is in accord with the growth of non-Gaussianity and spatially heterogeneous dynamics.

    DOI: 10.1126/sciadv.1700399

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  32. Shear jamming and shear melting in mechanically trained frictionless particles

    Takeshi Kawasaki and Kunimasa Miyazaki,

    arXiv   Vol. :2003.10716   2020.3

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  33. Local Density Fluctuation Governs the Divergence of Viscosity Underlying Elastic and Hydrodynamic Anomalies in a 2D Glass-Forming Liquid Reviewed

    Hayato Shiba, Takeshi Kawasaki, Kang Kim

    Physical Review Letters   Vol. 123 ( 26 ) page: 265501   2019.12

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:American Physical Society (APS)  

    DOI: 10.1103/physrevlett.123.265501

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    Other Link: http://harvest.aps.org/v2/journals/articles/10.1103/PhysRevLett.123.265501/fulltext

  34. Classification of mobile- and immobile-molecule timescales for the Stokes-Einstein and Stokes-Einstein-Debye relations in supercooled water Invited Reviewed

    Takeshi Kawasaki, Kang Kim

    Journal of Statistical Mechanics: Theory and Experiment   Vol. 2019   page: 084004   2019.8

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  35. Resolving spurious violation of the Stokes-Einstein-Debye relation in supercooled water Reviewed

    Takeshi Kawasaki, Kang Kim

    Scientific Reports   Vol. 9   page: 8118   2019.5

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  36. Theory of applying shear strains from boundary walls: linear response in glasses, Reviewed

    Akira Onuki, Takeshi Kawasaki

    The Journal of Chemical Physics   Vol. 150   page: 124504   2019.3

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  37. Slow dynamics coupled with cluster formation in ultrasoft-potential glasses Reviewed

    Ryoji Miyazaki, Takeshi Kawasaki, Kunimasa Miyazaki

    The Journal of Chemical Physics   Vol. 150   page: 074503   2019.2

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  38. Relationship between bond-breakage correlations and four-point correlations in heterogeneous glassy dynamics: Configuration changes and vibration modes (vol 86, 041504, 2012)

    Hayato Shiba, Takeshi Kawasaki, Akira Onuki

    PHYSICAL REVIEW E   Vol. 95 ( 6 ) page: 069901   2017.6

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    DOI: 10.1103/PhysRevE.95.069901

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  39. Cluster Glass Transition of Ultrasoft-Potential Fluids at High Density (vol 117, 165701, 2016) Reviewed

    Ryoji Miyazaki, Takeshi Kawasaki, Kunimasa Miyazaki

    PHYSICAL REVIEW LETTERS   Vol. 117 ( 23 )   2016.12

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    DOI: 10.1103/PhysRevLett.117.239902

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  40. Erratum: Excitation of vibrational soft modes in disordered systems using active oscillation (Soft Matter (2016) DOI:10.1039/c6sm00788k) Reviewed

    Elsen Tjhung, Takeshi Kawasaki

    Soft Matter   Vol. 12 ( 24 ) page: 5490   2016

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Royal Society of Chemistry  

    DOI: 10.1039/c6sm90096h

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  41. Diverging viscosity and soft granular rheology in non-Brownian suspensions Reviewed

    Takeshi Kawasaki,Daniele Coslovich, Atsushi Ikeda, and Ludovic Berthier

    Physical Review E   Vol. 91   page: 012203   2015.1

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    DOI: https://doi.org/10.1103/PhysRevE.91.012203

  42. モンペリエ第二大学滞在記

    川﨑 猛史

    アンサンブル   Vol. 17 ( 3 ) page: 181 - 184   2015

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    Publisher:分子シミュレーション研究会  

    DOI: 10.11436/mssj.17.181

  43. Thinning or thickening? Multiple rheological regimes in dense suspensions of soft particles Reviewed

    Takeshi Kawasaki, Atsushi Ikeda, Ludovic Berthier

    EPL   Vol. 107 ( 2 ) page: 28009   2014.7

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    DOI: doi:10.1209/0295-5075/107/28009

  44. Structural evolution in the aging process of supercooled colloidal liquids Reviewed

    Takeshi Kawasaki, Hajime Tanaka

    Physical Review E   Vol. 89   page: 062315   2014.6

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    DOI: http://dx.doi.org/10.1103/PhysRevE.89.062315

  45. Dynamics in a tetrahedral network glassformer: Vibrations, network rearrangements, and diffusion Reviewed

    Takeshi Kawasaki, Kang Kim, Akira Onuki

    The Journal of Chemical Physics   Vol. 140   page: 184502   2014.5

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    DOI: http://dx.doi.org/10.1063/1.4873346

  46. Spatiotemporal Heterogeneity of Local Free Volumes in a Highly Supercooled Liquid Reviewed

    Hayato Shiba,Takeshi Kawasaki

    The Journal of Chemical Physics   Vol. 139   page: 184502   2013.11

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    DOI: http://dx.doi.org/10.1063/1.4829442

  47. Dynamics of thermal vibrational motions and stringlike jump motions in three-dimensional glass-forming liquids Invited Reviewed

    Takeshi Kawasaki, Akira Onuki

    JOURNAL OF CHEMICAL PHYSICS   Vol. 138 ( 12 ) page: 12A514   2013.3

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    Using molecular dynamics simulation on a glass-forming liquid in three dimensions, we investigate the thermal vibrational motions, the configuration changes caused by stringlike jump motions, and their close correlations. The heterogeneous vibrational motions are visualized in terms of a vibration length S-i(t) defined for each particle i. The structure factor for the inhomogeneity of S-i(t)(2) is also calculated, which exhibits considerable long wavelength enhancement. By examining the birth times of strings, they are shown to appear collectively and intermittently. We show that particles with larger S-i(t) tend to trigger jump motions more frequently at later times than those with smaller S-i(t). We also show that the particles with fewer bonds tend to have larger S-i(t) and participate more frequently in the stringlike motions. (C) 2013 American Institute of Physics. [http://dx.doi.org/10.1063/1.4770337]

    DOI: 10.1063/1.4770337

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  48. Slow relaxations and stringlike jump motions in fragile glass-forming liquids: Breakdown of the Stokes-Einstein relation Reviewed

    Takeshi Kawasaki, Akira Onuki

    Physical Review E   Vol. 87   page: 012312   2013.1

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    DOI: http://dx.doi.org/10.1103/PhysRevE.87.012312

  49. Dynamics of thermal vibrational motions and stringlike jump motions in three-dimensional glass-forming liquids Invited Reviewed

    Takeshi Kawasaki, Akira Onuki

    The Journal of Chemical Physics   Vol. 138   page: 12A514   2013.1

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    DOI: http://dx.doi.org/10.1063/1.4770337

  50. Hierarchical heterogeneous glassy dynamics of configuration changes and vibration modes Invited Reviewed

    Takeshi Kawasaki, Hayato Shiba, Akira Onuki

    AIP Conference Proceedings   Vol. 1518   page: 784 - 791   2013

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    To understand the quantitative properties of dynamic heterogeneities on glassy particle systems, we use the theoretical scheme of bond-breakage which can detect configuration rearrangements corresponding to the structural relaxations. It is compared with the four-point correlation scheme for the results of binary mixtures with molecular dynamics simulations of two dimensional NVE ensembles. From the comparisons in the systems, we find superpositions of heterogeneity of configuration rearrangements and that induced by low-frequency vibration modes. The bond breakage scheme detects the long-time relaxations without short-time vibrations. The four-point scheme detects the mixed dynamics of the both. We find that the results on four-point scheme are sensitive to the influence of such vibration modes which gives rise to detectable system-size effects in physical properties. © 2013 American Institute of Physics.

    DOI: 10.1063/1.4794679

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  51. Spontaneous bond orientational ordering in liquids: An intimate link between glass transition and crystallization Invited Reviewed

    Hajime Tanaka, John Russo, Mathieu Leocmach, Takeshi Kawasaki

    4TH INTERNATIONAL SYMPOSIUM ON SLOW DYNAMICS IN COMPLEX SYSTEMS: KEEP GOING TOHOKU   Vol. 1518   page: 143 - 152   2013

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    The origin of slow dynamics near glass transition and the mechanism of crystal nucleation are two unsolved fundamental problems associated with the metastable supercooled state of a liquid. So far these phenomena have been considered rather independently, however, we have revealed an intimate link between them. Recently we found that crystal-like bond orientational order develops in the supercooled state of (nearly) single-component systems such as spin liquids and weakly polydisperse colloidal liquids. In these liquids, low free-energy configurations in a supercooled liquid have a link to the rotational symmetry which is going to be broken upon crystallization. We argue that this is a direct consequence of that the same free energy governs both glass transition and crystallization at least in this type of liquids. We found that it is such structural ordering at least in this type of liquids that causes glassy slow dynamics and dynamic heterogeneity. Furthermore, we revealed that such structural order also plays a crucial role in crystal nucleation: Crystallization is a process of the enhancement of spatial coherence of crystal-like bond orientational order and 'not' driven by translational order at least in the nucleation stage. These results clearly indicate that the theoretical description at the two-body level is not enough to describe these phenomena and it is crucial to take into account many body correlations, particularly, bond orientational correlations. We argue that there is an intrinsic link between glass transition and crystallization if crystallization does not accompany other processes such as phase separation. If crystallization involves phase separation, on the other hand, such a direct link may be lost. We speculate that even in such a case glassy structural order may still be associated with low free-energy local configurations.

    DOI: 10.1063/1.4794561

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  52. Relationship between bond-breakage correlations and four-point correlations in heterogeneous glassy dynamics: Configuration changes and vibration modes Reviewed

    Hayato Shiba,Takeshi Kawasaki, and Akira Onuki

    Physical Review E   Vol. 86   page: 041504   2012.10

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    DOI: http://dx.doi.org/10.1103/PhysRevE.86.041504

  53. Rheology of Solids Reviewed

    Takeshi Kawasaki, Akira Onuki

    NIHON REOROJI GAKKAISHI   Vol. 40 ( 3 ) page: 151 - 155   2012

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    We review our recent studies on the structural disorder in crystal, polycrystal, and glass in a Lennard-Jones binary mixture in three dimensions using molecular dynamics simulation. At a low temperature, the crossovers among these states occur as the amount of the large particles is varied. We define a disorder variable D-j (t) for each particle j in terms of local bond order parameters based on spherical harmonics (Steinhardt order parameters). Mesoscopic structural heterogeneity in glass is then visualized. In fcc crystal and polycrystal, we show that stacking faults play an important role in plasticity.

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  54. Construction of a disorder variable from Steinhardt order parameters in binary mixtures at high densities in three dimensions Reviewed

    Takeshi Kawasaki, Akira Onuki

    The Journal of Chemical Physics   Vol. 135   page: 174109   2011.11

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    DOI: http://dx.doi.org/10.1063/1.3656762

  55. Structural origin of enhanced slow dynamics near a wall in glass-forming systems Reviewed

    Keiji Watanabe, Takeshi Kawasaki, Hajime Tanaka

    NATURE MATERIALS   Vol. 10 ( 7 ) page: 512 - 520   2011.7

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    Spatial confinement is known to induce a drastic change in the viscosity, relaxation times, and flow profile of liquids near the glass (or jamming) transition point. The essential underlying question is how a wall affects the dynamics of densely packed systems. Here we study this fundamental problem, using experiments on a driven granular hard-sphere liquid and numerical simulations of polydisperse and bidisperse colloidal liquids. The nearly hard-core nature of the particle-wall interaction provides an ideal opportunity to study purely geometrical confinement effects. We reveal that the slower dynamics near a wall is induced by wall-induced enhancement of `glassy structural order', which is a manifestation of strong interparticle correlations. By generalizing the structure-dynamics relation for bulk systems, we find a quantitative relation between the structural relaxation time at a certain distance from a wall and the correlation length of glassy structural order there. Our finding suggests that glassy structural ordering may be the origin of the slow glassy dynamics of a supercooled liquid.

    DOI: 10.1038/NMAT3034

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  56. Structural signature of slow dynamics and dynamic heterogeneity in two-dimensional colloidal liquids: glassy structural order Reviewed

    Takeshi Kawasaki, Hajime Tanaka

    Journal of Physics: Condensed Matter   Vol. 23 ( 19 ) page: 194121   2011.4

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    DOI: doi:10.1088/0953-8984/23/19/194121

  57. Structural origin of enhanced slow dynamics near a wall in glass-forming systems Reviewed

    Keiji Watanabe, Takeshi Kawasaki, and Hajime Tanaka

    Nature Materials   Vol. 10   page: 512   2011.4

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    DOI: doi:10.1038/nmat3034

  58. Formation of a crystal nucleus from liquid Reviewed

    Takeshi Kawasaki, Hajime Tanaka

    PNAS   Vol. 107 ( 32 ) page: 14036   2010.6

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    DOI: doi: 10.1073/pnas.1001040107

  59. Structural origin of dynamic heterogeneity in three-dimensional colloidal glass formers and its link to crystal nucleation Reviewed

    Takeshi Kawasaki, Hajime Tanaka

    Journal of Physics: Condensed Matter   Vol. 22 ( 23 ) page: 232102   2010.5

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    DOI: doi:10.1088/0953-8984/22/23/232102

  60. Critical-like behaviour of glass-forming liquids Reviewed

    Hajime Tanaka, Takeshi Kawasaki, Hiroshi Shintani, Keiji Watanabe

    Nature Materials   Vol. 9   page: 324   2010.1

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    DOI: doi:10.1038/nmat2634

  61. Apparent Violation of the Fluctuation-Dissipation Theorem due to Dynamic Heterogeneity in a Model Glass-Forming Liquid Reviewed

    Takeshi Kawasaki, Hajime Tanaka

    Physical Review Letters   Vol. 102   page: 185701   2009.5

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    DOI: http://dx.doi.org/10.1103/PhysRevLett.102.185701

  62. Reply to the comment on Correlation between Dynamic Heterogeneity and Medium-Range Order in Two-Dimensional Glass-Forming Liquids Reviewed

    Takeshi Kawasaki, Hajime Tanaka

    Physical Review Letters   Vol. 100   page: 099602   2008.3

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    DOI: http://dx.doi.org/10.1103/PhysRevLett.100.099602

  63. Link between vitrification and crystallization in two-dimensional polydisperse colloidal liquid Invited Reviewed

    T. Kawasaki, T. Araki, H. Tanaka

    COMPLEX SYSTEMS-BOOK 1   Vol. 982   page: 238 - 240   2008

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    Glasses are formed if crystallization is avoided upon cooling or increasing density. However, the physical factors controlling the ease of vitrification and nature of the glass transition remain elusive. We use numerical simulations of polydisperse hard disks to tackle both of these longstanding questions. Here we systematically control the polydispersity in two-dimensional colloidal simulations, i.e., the strength of frustration effects on crystallization. We demonstrate that medium-range crystalline order grows in size and lifetime with an increase in the colloid volume fraction or a decrease in polydispersity (or, frustration). We find a direct relation between medium-range crystalline ordering and the slow dynamics that characterizes the glass transition. This suggests an intriguing scenario that the strength of frustration controls both the ease of vitrification and nature of the glass transition at least in this system. Vitrification may be a process of hidden crystalline ordering under frustration. This not only provides a physical basis for glass formation, but also an answer to a longstanding question on the structure of amorphous materials: "order in disorder" may be an intrinsic feature of a glassy state of material. Thus our scenario makes a natural connection between structure and dynamics in glass-forming materials, although its relevance should be carefully checked for 3D glass-forming liquids.

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  64. Correlation between Dynamic Heterogeneity and Medium-Range Order in Two-Dimensional Glass-Forming Liquids Reviewed

    Takeshi Kawasaki, Takeaki Araki, Hajime Tanaka

    Physical Review Letters   Vol. 99   page: 215701   2007.11

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    DOI: http://dx.doi.org/10.1103/PhysRevLett.99.215701

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Presentations 40

  1. グッド・プラクティス報告 「高校物理未履修者と高校物理トップ層が共存する 医学科クラスでの講義 ̶ 学生との対話と教材づ くり ̶ 」 Invited

    川﨑猛史

    教養教育院 物理学部会FD  2024.3.26  名古屋大学教養教育院物理学部会

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    Event date: 2024.3

    Language:Japanese   Presentation type:Oral presentation (invited, special)  

    Venue:オンライン   Country:Japan  

  2. Unified understanding of nonlinear rheology near jammin Invited International conference

    Takeshi Kawasaki

    4th Regular Kakenhi Meeting on Theoretical studies of nonequilibrium phenomena in dissipative- driven systems, 202  2024.3.4 

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    Event date: 2024.3

    Language:English   Presentation type:Oral presentation (invited, special)  

    Country:Japan  

  3. 解釈可能機械学習を用いた非晶質固体系における構造抽出手法の開拓 Invited

    川﨑猛史

    データ同化学研究会  2024.2.24 

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    Event date: 2024.2

    Language:Japanese   Presentation type:Oral presentation (invited, special)  

    Venue:名古屋大学宇宙地球環境研究所   Country:Japan  

  4. 解釈可能機械学習を用いた非晶質固体系の構造解析スキームの開発 Invited

    川﨑猛史

    学習物理学領域会議  2023.9.28 

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    Event date: 2023.9

    Language:Japanese   Presentation type:Oral presentation (invited, special)  

    Country:Japan  

  5. Non-linear rheology of amorphous solids near the jamming transition point

    Takeshi Kawasaki

    The 7th International Soft Matter Conference, ISMC2023  2023.9.7 

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    Event date: 2023.9

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Osaka International Convention Center (Grand Cube Osaka)   Country:Japan  

  6. 非晶質固体系の物理学入門 Invited

    川﨑猛史

    第68回物性若手夏の学校集中ゼミ  2023.8.14  物性若手夏の学校

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    Event date: 2023.8

    Language:Japanese   Presentation type:Symposium, workshop panel (nominated)  

    Venue:マキノパークホテル   Country:Japan  

  7. Non-linear rheology of amorphous solids near the jamming transition point International conference

    Takeshi Kawasaki

    STATPHYS 28  2023.8.8 

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    Event date: 2023.8

    Country:Japan  

  8. グッド・プラクティス報告 取り組み紹介 物理学基礎I(医学部医学科) Invited

    川﨑猛史

    名古屋大学教養教育院物理学部会FD  2023.3.30  名古屋大学教養教育院物理学部会

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    Event date: 2023.3

    Language:Japanese   Presentation type:Oral presentation (invited, special)  

    Venue:オンライン   Country:Japan  

  9. What do deep neural networks find in disordered structures of glasses? Invited International conference

    Takeshi Kawasaki

    The 6th International Conference on Molecular Simulation (ICMC2023)  2023.10.8 

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    Event date: 2023.10

    Language:English   Presentation type:Oral presentation (invited, special)  

    Venue:National Taiwan University, Taipei, Taiwan   Country:Taiwan, Province of China  

    Glass transitions are widely observed in various types of soft matter systems. However, the
    physical mechanism of these transitions remains elusive despite years of ambitious research.
    In particular, an important unanswered question is whether the glass transition is accompanied
    by a divergence of the correlation lengths of the characteristic static structures. In this study,
    we develop a deep-neural-network-based method that is used to extract the characteristic local
    meso-structures solely from instantaneous particle configurations without any information
    about the dynamics. We first train a neural network to classify configurations of liquids and
    glasses correctly. Then, we obtain the characteristic structures by quantifying the grounds for
    the decisions made by the network using Gradient-weighted Class Activation Mapping (Grad-
    CAM). We consider two qualitatively different glass-forming binary systems, and through
    comparisons with several established structural indicators, we demonstrate that our system
    can be used to identify characteristic structures that depend on the details of the systems.
    Moreover, the extracted structures are remarkably correlated with dynamics in thermal
    fluctuations [1].
    Reference:
    [1] N. Oyama, S. Koyama, and T. Kawasaki, What Do Deep Neural Networks Find in
    Disordered Structures of Glasses?, Frontiers in Physics 10:1007861 (2023).

  10. Non-linear rheology of amorphous solids near the jamming transition point Invited International conference

    Takeshi Kawasaki

    The 9th International Discussion Meeting on Relaxations in Complex Systems (9 IDMRCS)  2023.8.13 

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    Language:English   Presentation type:Oral presentation (invited, special)  

    Venue:Makuhari Messe,Chiba   Country:Japan  

  11. Topological phase transitions in passive or active particles with chiral interactions International conference

    Japan-France joint seminar "Physics of dense and active disordered materials" 

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    Event date: 2023.3

    Country:Japan  

  12. 周期振動下高密度分散系の粒子軌道に関する可 逆・不可逆不連続転移

    川﨑 猛史

    第 30 回分子シミュレーション討論会  2016.12.2 

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  13. 周期剪断を与えた高密度分散系の粒子軌道に関する可 逆・不可逆非平衡相転移" Invited

    川﨑 猛史

    特別講演会 「粒子系の構造形成と不均一変形のダイナミクス  2017.1.23 

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  14. 古典的異方粒子系における相転移ダイナミクス” Invited

    川﨑猛史

    新学術領域研究「量子液晶の物性科学」C01班公募研究キックオフミーティング  2020.7.8 

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  15. Discontinuous shear-thickening in Brownian suspensions

    2018.9.9 

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    Venue:Doshisya University, Kyoto  

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  16. ジャミング転移点近傍における粒子軌道の可逆性に関する非平衡相転移

    川﨑 猛史

    第32回分子シミュレーション討論会  2018.11.28 

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    Venue:筑波 産総研  

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  17. ジャミング転移点近傍にある周期剪断下高密度分散系における粒子軌道の可逆・不可逆転移 Reversible-irreversible transitions in particle trajectories in oscillatory sheared systems near the jamming transition"

    永澤謙太郎, 宮崎州正, 川崎猛史

    日本物理学会 2017年度年次大会 岩手大学 

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  18. Reversible-Irreversible transition in particle trajectories near the jamming transition Invited International conference

    Takeshi Kawasaki

    2019 International Workshop on Soft Matter and Biophysics Theories (SMTB2019) BTG Fragrance Hill Hotel, Beijing  2019.5.11 

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  19. Melting Phenomena in Two-Dimensional Anisotropic Particles Invited

    Takeshi Kawasaki

    FYR02 QLC meeting  2020.12.23 

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  20. Classification of the reversible-irreversible transitions in particle trajectories near the jamming transition International conference

    Takeshi Kawasaki

    Rheology of disordered particles — suspensions, glassy and granular materials:part II  2018.6.28 

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    Venue:Kyoto  

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  21. A non-equilibrium phase transition in particle trajectories near the jamming transition Invited International conference

    Takeshi Kawasaki

    International mini-workshop on Nonequlibrium transport and phase transition in novel materials  2018.11.26 

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    Venue:Nagoya  

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  22. A non-equilibrium phase transition in particle trajectories near the jamming transition Invited International conference

    Takeshi Kawasaki

    Soft Matter Physics: from the perspective of the essential heterogeneity  2018.12.12 

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    Venue:Fukuoka  

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  23. Discontinuous shear-thickening in Brownian suspensions Invited International conference

    Takeshi Kawasaki

    Rheology of disordered particles — suspensions, glassy and granular materials:part I  2018.6.19 

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    Venue:Kyoto  

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  24. 異方粒子系における創発弾性場とトポロジカル相転移 Invited

    川﨑猛史

    凝縮系の理論化学  2022.3.29 

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    Venue:那覇(オンラインハイブリット)   Country:Japan  

  25. 多様な非晶性固体の構造抽出スキームの開発 Invited

    川﨑猛史

    JST 融合の場公開シンポジウム  2022.5.23  JST

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    Language:Japanese   Presentation type:Oral presentation (invited, special)  

    Venue:名古屋大学   Country:Japan  

  26. トポロジカル相転移がもたらす創発弾性場:分子のキラリティと立体異方性の影響 Invited

    川﨑猛史

    名古屋大学St 研(凝縮系理論量子輸送グループ) セミナー  2022.6.24 

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    Language:Japanese   Presentation type:Oral presentation (invited, special)  

    Venue:名古屋大学   Country:Japan  

  27. トポロジカル相転移がもたらす創発弾性場:分子のキラリティと立体異方性の影響 Invited

    川﨑猛史

    The 15th Mini-Symposium on Liquids  2022.7.9 

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    Venue:九州大学   Country:Japan  

  28. 多様な非晶性固体の構造抽出スキームの開発 Invited

    川﨑猛史

    2022 年度第4 回創発ランチタイムセミナー  2022.7.29  名古屋大学高等研究院

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    Venue:オンライン   Country:Japan  

  29. Emergent elasticity and topological phase transitions controlled via molecular chirality and steric anisotropy, International conference

    Takeshi Kawasaki

    2nd Regular Kakenhi Meeting on “Theoretical Study on Nonequilibrium Phenomena in Driven Dissipative Systems”  2022.11.1 

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    Venue:Kyoto   Country:Japan  

  30. Identifying time scales for violation/preservation of Stokes-Einstein relation in supercooled water, Invited International conference

    Takeshi Kawasaki

    ICPAC Kota Kinabalu 2022, Malaysia  2022.11.22 

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    Country:Malaysia  

  31. 高密度分散系における様々なタイプの可逆・不可逆粒子軌道転 Invited

    川﨑 猛史

    第7回ソフトマター研究会.  2017.10.23 

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  32. 第13回凝縮系科学賞受賞講演:過冷却液体の構造とダイナミクスに関する理論的研究 Invited

    Takeshi Kawasaki

    2018.11.30 

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    Language:Japanese   Presentation type:Oral presentation (keynote)  

    Venue:Nara, Japan  

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  33. The reversible-irreversible transitions in particle trajectories near the jamming transition International conference

    Takeshi Kawasaki

    Physics of Jammed Matter  2018.10.27 

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    Venue:Kyoto, Japan  

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  34. Shear jamming and shear melting in mechanically trained frictionless particles Invited International conference

    Takeshi Kawasaki

    2019 international workshop on glass physics in Beijing, Sept 25 - 28, 2019, Institute of Theoretical Physics, Beijing  2019.9.25 

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  35. Macroscopic yielding in jammed solids is accompanied by a nonequilibrium first-order transition in particle trajectories Invited International conference

    Takeshi Kawasaki

    Nara Workshop on Nonlinear Dynamics 2016 Dec. under HAS-JSPS Joint Research Project  2016.12 

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    Venue:Nara, Japan  

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  36. Macroscopic yielding in jammed solids is accompanied by a non-equilibrium first-order transition in particle trajectories International conference

    川﨑 猛史

    Avalanches, plasticity, and nonlinear response in nonequilibrium solids  2016.3.7 

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  37. Identifying time scales for violation/preservation of Stokes-Einstein relation in supercooled water International conference

    Takeshi Kawasaki

    The 5th international conference on molecular simulation, November 3-6, 2019 / Lotte Hotel Jeju, Korea  2019.11.5 

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  38. Identification of the time-scales that support violation or preservation of Stokes-Einstein relation in supercooled water International conference

    Takeshi Kawasaki

    Unifying Concepts in Glass Physics VII  2018.6.15 

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    Venue:Bristol, UK  

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  39. Identification of the time-scales that support violation or preservation of Stokes-Einstein relation in supercooled water International conference

    Takeshi Kawasaki

    Designer soft matter 2018  2018.6.6 

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  40. Identification of the time-scales that support violation or preservation of Stokes-Einstein relation in supercooled water International conference

    Takeshi Kawasaki

    Joint EMLG/JMLG Meeting 2017  2017.9.11 

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Research Project for Joint Research, Competitive Funding, etc. 1

  1. Designing reconfigurable soft materials using light-activated rotational jamming

    2017.5 - 2019.5

    Takeshi Kawasaki and Lilian Hsiao

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    Grant type:Competitive

KAKENHI (Grants-in-Aid for Scientific Research) 14

  1. イオン渋滞学の構築に向けた数理・計算シミュレーション解析 International coauthorship

    2024.4 - 2029.3

    日本学術振興会  科研費  学術変革A(計画研究)イオン渋滞学

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    Authorship:Coinvestigator(s)  Grant type:Competitive

    Grant amount:\26000000 ( Direct Cost: \20000000 、 Indirect Cost:\6000000 )

  2. ガラス系における解釈可能機械学習を用いた構造抽出手法の開拓

    Grant number:23H04503  2023.4 - 2025.3

    日本学術振興会  科研費 学術変革A(公募研究)学習物理学の創生 

    川﨑猛史

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    Authorship:Principal investigator  Grant type:Competitive

    Grant amount:\13000000 ( Direct Cost: \10000000 、 Indirect Cost:\3000000 )

  3. Structural analysis and kinetic modelling of inflammatory cells.

    Grant number:JP22zf0127009  2023.1 - 2029.12

    AMED  Target 7

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    Authorship:Coinvestigator(s) 

    Grant amount:\26000000 ( Direct Cost: \20000000 、 Indirect Cost:\6000000 )

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  4. 多様な非晶性固体の構造解析スキームの開発

    Grant number:JPMJFR212T  2022.4 - 2025.3

    科学技術振興機構  JST 創発的研究支援事業 

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    Authorship:Principal investigator 

    Grant amount:\20000000 ( Direct Cost: \20000000 )

  5. キラル古典異方粒子系におけるトポロジカル相の制御

    Grant number:22H04472  2022.4 - 2025.3

    日本学術振興会  新学術領域研究(公募研究)量子液晶の物性科学 

    川﨑猛史

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    Authorship:Principal investigator  Grant type:Competitive

    Grant amount:\2860000 ( Direct Cost: \2200000 、 Indirect Cost:\660000 )

  6. 液晶秩序を発現する古典異方粒子系における相転移ダイナミクス

    Grant number:20H05157  2020.4 - 2022.3

    JSPS  Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area)

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    Authorship:Principal investigator 

    Grant amount:\2990000 ( Direct Cost: \2300000 、 Indirect Cost:\690000 )

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  7. エネルギー地形および非平衡相転移描像を用いた,固体の力学応答に関する統一的理解

    Grant number:19K03767  2019.4 - 2022.3

    日本学術振興会  科研費 基盤研究(C) 

    川﨑 猛史

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    Authorship:Principal investigator  Grant type:Competitive

    結晶やアモルファス等の固体材料は,これらの初期構造の安定性によって,変形に対して急激に壊れる(脆性破壊)または徐々に壊れる(延性破壊)を示すことが経験的に知られている.しかし,これらの物理機構は未解明である.本研究は,コンピュータシミュレーションを用い,熱や変形により固体の初期構造を系統的に変化させ,脆性破壊および脆性破壊が起こる物理機構を解明する.
    物質をある初期温度で構造緩和させ,その後冷却するという過程をアニールとよび,その力学物性はアニール温度によって大きく変化することが知られている.十分アニールした場合,初期温度が低いほど,物質はより安定な構造をとる.一方,この安定性に関する議論は,あらわに構造が特定できないガラスにおいても適用可能であることが知られている.ミクロな側面から多大な知見を与える分子動力学法など従来型の数値計算では,大規模なものであっても構造緩和時間を高々ミリ秒オーダーまでしか計算することが難しいため,実験におけるガラス転移温度に比べ遥かに高温領域までしかアニールすることが出来なかった.これに対して本研研究では,大変効率の良い熱平衡サンプリング法を用いることにより,アニール温度を大きく変化させた,安定性が幅広く異なるガラスに対し,非常にゆっくりな(準静的な)周期剪断を与えた際の力学特性を調べた.
    本年度の成果は以下の通りである.
    (1) 剪断強度を大きくしていくと,高温でアニールしたガラスは,高エネルギー状態から徐々にエネルギーが下がり,降伏が起こるところで最小値を示し,降伏後上昇することを確認した.一方,極低温でアニールしたガラスは,低エネルギーを示す安定状態から始まり,降伏までエネルギーはほぼ一定となった.そして、降伏の際,不連続に増大し,その後は高温でアニールしたサンプルと同様な振る舞いを見せることが分かった.
    (2) 高温でアニールしたサンプルにおける応力歪み曲線は,連続的に振る舞い,一方,極低温でアニールしたサンプルは、降伏で不連続に振る舞うことを確認した.さらに,ここでの不連続な振る舞いは,エネルギーが不連続に増大することと対応していることを明らかにした.
    (3) 降伏の不連続性の有無は,初期状態のエネルギーが降伏時におけるエネルギーの大小関係から一意に決まることを示した.
    サンプルに対するアニールの度合いにより,応力歪み曲線において,脆性破壊的な不連続的振る舞いを見せる場合と,延性破壊的な連続的振る舞いを見せることは近年の先行研究により示されていたが,そのメカニズムは明らかとなっていなかった.本研究では,初期構造のエネルギーと,降伏時におけるエネルギーを比較することにより力学応答が脆性的になるか,あるいは延性的となるかが一意に決まるという極めて明解な結果を得た.本研究結果は,論文として纏められており,最近(2020年6月),Physical Review Lettersから出版されたことからも,十分なインパクトを有すると考えている.
    本年度は,系全体のエネルギー―などマクロな量についての議論を行った.今後は,剪断に伴う構造変化やそれに伴う力学物性の異方性など,よりミクロな観点からこの問題を考察したい.特に,サンプルの構築に関しては,アニールを熱だけでなく,周期剪断の様な機械強化機構(機械的アニールと呼ぶ)に置き換え,これを熱によりアニールされた系と比較することにより,それぞれにおける力学応答の類似点と相違点を明らかにする.

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  8. Passive and active dynamics in soft deformable particles

    Grant number:16H06018  2016.4 - 2019.3

    Takeshi Kawasaki

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    Authorship:Principal investigator  Grant type:Competitive

    Grant amount:\9230000 ( Direct Cost: \7100000 、 Indirect Cost:\2130000 )

    In this study, we use soft model particles to investigate the "passive system," which is driven by thermal fluctuations or external forces such as emulsions and colloids, and "active system" such as cells and biological species which are self-driven systems. The purpose of this study was to clarify the flow characteristics and vibration properties of high-density passive and active particle systems. As a result, we clarify that the softness of the particles is related to the origin of the complex nonlinear flow phenomenon in the passive system. Besides, we find a new type of non-equilibrium phase transition by using soft particles under periodic shear. In the active system, we develop a new method to extract the vibrational properties of solids by using the linear response between the softness of the particles and the self-driving force.

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  9. 変形の効果を考慮した粒子の分散系における流動特性

    Grant number:15H06263  2015.8 - 2016.3

    日本学術振興会  科研費 若手研究(研究活動スタート支援)  若手研究 (研究活動スタート支援)

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    Grant type:Competitive

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  10. Glass/jamming transitions of the out-of-equiilbirum systems

    Grant number:20H00128  2020.4 - 2024.3

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    Authorship:Coinvestigator(s) 

  11. Molecular mechanism of slow dynamics in glass-forming liquids: Transition states and transport phenomena

    Grant number:18H01188  2018.4 - 2022.3

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    Authorship:Coinvestigator(s) 

  12. Designing reconfigurable soft materials using light-activated rotational jamming

    2017.5 - 2019.5

    Takeshi Kawasaki, Lilian Hsiao

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    Authorship:Principal investigator  Grant type:Competitive

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  13. Non-Gaussian fluctuation and rheology in jammed matter

    Grant number:16H04025  2016.4 - 2020.3

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    Authorship:Coinvestigator(s) 

  14. 非平衡・非一様・非従来型液体のガラス転移の研究

    Grant number:16H04034  2016.4 - 2020.3

    宮崎 州正

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    Authorship:Coinvestigator(s) 

    (1)非平衡ガラス転移について:(a) 昨年度に引き続きアクティブマターの新規モデルの開発とその解析を行った。非マルコフ過程に従うランジュバン方程式では、散逸と揺らぎの二つの緩和時間がある、その両方が等しい場合が平衡系である。一方、揺らぎの緩和時間のみを有限にしたモデルが、最近研究されているアクティブマターである。我々は散逸の緩和時間も系統的に変化させたモデルを考案し、その解析を行った。その結果、その密度が抑えられ、超一様系が存在することが明らかになった。その指数は非整数でありこれまで発見された超一様性のモデルのいずれにも属さないのものである。(b)標準的なアクティブマターの模型であるAOUPモデルのガラス転移の解析を行った。従来にはない大きな「非平衡度」領域を幅広く探索し、その領域での動的不均一性を解析した。我々の解析結果は動的相関などに際立った相違が現れることを示唆している。(c)コロイド系とガラス系のジャミング転移近傍の非線形レオロジーと可逆不可逆転移について解析を行った。ジャミング転移点より低密度領域においてもその動的挙動は極めて多彩であり、粒子軌道は不可逆的になりうる。不可逆軌道の一部は、応力応答として巨視的に観測できることを明らかにした。また急冷したガラス系の応力応答の解析を行い、その非線形レオロジーが急冷速度と振動シアの振幅に大きく依存する事を明らかにした。
    (2)非一様ガラス転移について:ランダムピニング系のガラス相における残留エントロピーとダイナミクスの計算から、metabasin中のダイナミクスが残っており、ランドスケープの階層性に由来する残留エントロピーが有限であることを示した。
    (3)非従来系のガラス転移について:ultrasoft系の解析を行い、ガラス転移線上に起こる動的特異点付近でのStokes-Einstein則の破れを定量的に評価した。
    (1)非平衡ガラス転移について:(a) 新規アクティブマター模型の提案と、新しいタイプの超一様性の発見は予想していなかったことである。超一様性はいくつかの非平衡模型で発見されているが、我々の指数は、それらのいずれとも異なる。さらにこの系は動的に揺らいでいる系であり、これまでの静的なモデルとは本質的な相違がある。その意味で今後研究が発展的に進むことが期待である。しかし今年度の解析はまだ限定的でさらなる系統的な解析が必要である。(b)AOUPモデルのガラス転移の研究の結果は、アクティブガラスの本質的には平衡ガラスと大きく変わらないという先行研究の結論に反するものであり、意義が大きい。しかしその相違の定量的な評価、物理的な起源についての解析は今後の課題である。(c)ガラス系とジャミング系の非線形レオロジーと可逆不可逆転移の問題では、多くの知見と成果が得られた。しかしそれ以上に、多くの課題が浮上し、この問題の奥の深さと今後の発展の可能性が明らかになった。その課題を顕在させたことが最大の成果かもしれない。
    (2)非一様ガラス転移について:プロジェクトとしては終盤となり解析と論文出版を行った。課題は多く残されているものの高い評価を得られる結果となった。
    (3)非従来系のガラス転移について:従来の典型的な系では見られないガラス転移の挙動、とくに大きなStokes-Einstein則の破れが成果である。この系の特異ダイナミクスはほぼ解析し尽くしたが、背後にあるであろう液体のポリアモルフィズムについては、今後の課題として残された。
    H31年度は、研究の三つの柱のうち、(1) 非平衡系のガラス転移を数値的解析を中心に、研究を実施する。(a)アクティブマター系で、既に我々が明らかにした、超一様性を示すパラメータ領域のダイナミクスも解析を開始する。(b) アクティブマターのガラス転移においては、今年度は解析をさらに進める。特に、動的不均一性に注目し、システムサイズ依存性、質量依存性(ダイナミクス依存性)を詳細に解析し、ボンド相関長などを通した特徴的な長さの抽出を目指す。これにより非平衡系特有の揺らぎのガラス転移における本質を抽出する。(c) ガラス系、ジャミング系の可逆不可逆転移と非線形レオロジーの解析をさらに進める。これまでほとんど手続かずであったジャミング点の直近、臨界領域を開拓する。このジャミング転移点は、ジャミングをする前の母体となる液体の構造に敏感に依存する。つまり圧力を急上昇させる前のアニールを充分に行うとより高密度のジャミング状態が得られる。そのクロスオーバはMCT転移点に支配されている。我々は、液体をMCT転移点以下で系統的にアニールさせ、ジャミング転移点近傍の不可逆転移とレオロジーを詳細に解析する。これにより、ジャミング転移点以下でも、シアにより誘引されるシアジャミング現象や、線形応答領域(弾性領域)と流動領域(降伏領域)の中間相である非線形応答領域に探索を行う。これらの解析は、可逆不可逆転移、降伏転移、ジャミング転移、ガラス転移、そして新しいガラス転移相として脚光を浴びているガードナー転移を統一的に理解する試みである。

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Teaching Experience (On-campus) 12

  1. Fundamentals of Physics I

    2023

  2. 統計物理学III演習

    2022

  3. 物理学基礎I

    2022

  4. Fundamentals of Physics I

    2020

  5. Physics Tutorial IV

    2020

  6. Applied Physics Tutorial IV a

    2020

  7. Physics Tutorial 4 (for Statistical Phsiycs 3)

    2016

  8. 物性生物物理学特別講義 (オムニバス講義 1回分)

    2016

  9. 統計物理学演習IV

    2016

  10. 物性生物物理学特別講義 (オムニバス講義 1回分)

    2015

  11. 統計物理学演習IV

    2015

  12. Physics Tutorial 4 (for Statistical Phsiycs 3)

    2015

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Teaching Experience (Off-campus) 1

  1. 分子シミュレーション特別講義(集中講義)

    2023.10 Nagoya Institute of Technology)

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    Level:Postgraduate  Country:Japan

 

Social Contribution 7

  1. 江南高校 大学模擬講義:過冷却液体の物理学

    Role(s):Lecturer

    愛知県立江南高校  2023.11

  2. 江南高校 大学模擬講義:過冷却液体の不思議

    Role(s):Lecturer

    江南高校 大学模擬講義  2022.11

  3. 新聞掲載:「第13回凝縮系科学賞受賞式 実験部門:水口氏 理論部門:川﨑氏」

    Role(s):Informant

    科学新聞社  2018.12

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    Type:Newspaper, magazine

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  4. 市民講演 あいちサイエンスフェスティバル 「過冷却液体の不思議」

    Role(s):Appearance, Lecturer

    豊橋地下資源館  名古屋大学出前授業 2018 in 豊橋  2018.11

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    Type:Visiting lecture

    File: 2018LectureMeidai2.jpg

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  5. 新聞掲載「過冷却水がドロドロの高粘度になる原因を解明」

    Role(s):Informant

    科学新聞社  科学新聞 2面  2017.8

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    Type:Newspaper, magazine

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  6. JST さくらサイエンスプラン・南京大学・学部生招聘プログラム

    Role(s):Presenter, Lecturer

    2017.3

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    Audience: College students

    Type:University open house

  7. JST さくらサイエンスプラン・南京大学・学部生招聘プログラム

    Role(s):Presenter, Lecturer

    2017.3

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    Audience: College students

    Type:University open house

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Media Coverage 2

  1. 新聞掲載「科学への関心高めた2カ月 あいちサイエンスフェス/名大出前授業豊橋できょう「最終講義」マントルや温度による物質の変化に興味津々 Newspaper, magazine

    東日新聞社  東日新聞  2018.11

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  2. 新聞掲載「氷点下でも凍らない水 どろどろの仕組み解明 阪大・名大」 Newspaper, magazine

    日本経済新聞社  日本経済新聞(朝刊・科学欄)  2017.10

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