研究者詳細 - 永島　壮

論文 - 永島　壮

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Wrinkle-Assisted Capillary Bridging for the Directed Assembly of Single-Level DNA Nanowire Arrays 査読有り国際共著

Nagashima, S; Yoon, SM; Kim, D; Nakatani, A; Moon, MW

Adv. Mater. Interfaces 9 巻 ( 6 ) 頁： 2102243 - 2102243 2022年2月

担当区分：筆頭著者,　責任著者記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Advanced Materials Interfaces

Assembly of molecular-scale nanowire arrays with defined spacing in an inexpensive and time-efficient manner enables the development of versatile functional nanodevices that are unattainable with conventional approaches involving top-down patterning techniques. This paper introduces a bottom-up method for rapidly assembling DNA molecules into periodically aligned 2-nm-thin nanowires. The method uses wettability-contrast channels composed of superhydrophilic wrinkles with a periodic high-aspect-ratio structure as the top and a hydrophobic flat surface as the bottom. After injecting the channels with DNA solution, one end of the wrinkled top is detached to facilitate unidirectional receding of an array of submicrometer-scale capillary bridges developed in between. The molecules confined in each capillary bridge are then made to evaporatively assemble into a linear structure on the flat surface, thus yielding an array of molecular-scale nanowires. The inter-nanowire separation can be controlled by tuning the wrinkle dimensions. The wrinkle-assisted capillary-bridging method, termed WaCaB, exploits the surface instability of a film–substrate system for wrinkle fabrication and employs a simple detachment process, thus offering a general and flexible pathway for the facile assembly of spatially organized single-level DNA nanowires, which can create new fabrication opportunities for devices in nanoelectronics, photonics, and biology.

DOI： 10.1002/admi.202102243

Web of Science

Scopus

Diversity of the bifurcations and deformations on films bonded to soft substrates: Robustness of the herringbone pattern and its cognate patterns 査読有り

Kikuchi, S; Matsubara, S; Nagashima, S; Okumura, D

J. Mech. Phys. Solids 159 巻 2022年2月

記述言語：英語出版者・発行元：Journal of the Mechanics and Physics of Solids

In this study, we investigate the diversity of the bifurcations and deformations during evolution of periodic patterns on compressed films bonded to compliant substrates. Three-dimensional finite element analysis is performed assuming that the first bifurcation has either the hexagonal or square (i.e., checkerboard) dimple mode. Step-by-step eigenvalue buckling analysis is performed to explore sequential bifurcations on the bifurcated paths. It is found that at the second bifurcation, a rectangular checkerboard or stripe mode occurs depending not only on the Young's modulus ratio of the film and substrate, but also on the magnitude of the imperfection prescribed by the first bifurcation mode. Different bifurcation modes give a family of herringbone deformation patterns with different dimensions, i.e., the evolutional process is multiple and robust. Further, superposition of the identical modes in symmetric directions elucidates the existence of distinctive patterns cognate with the herringbone pattern, including a variety of experimentally observed patterns.

DOI： 10.1016/j.jmps.2021.104757

Web of Science

Scopus

弾性体に誘起するクリースの発生と伝播の有限要素解析

松原成志朗, 星亮吾, 永島壮, 奥村大

理論応用力学講演会講演論文集 66 巻 ( 0 ) 頁： 5 2022年

記述言語：日本語出版者・発行元：日本学術会議「機械工学委員会・土木工学・建築学委員会合同IUTAM分科会」

<p>クリースは圧縮負荷が作用する弾性体の自由表面上で鋭い溝のような変形として発生する．クリースは弾性体の自由表面上で伝播して脳のしわなどに見られる特徴的なパターンを形成する．クリースの伝播は，直前のクリースが形成する不均質な変位場がトリガーとなると予想されるが，詳細なメカニズムはわかっていない．また，各々のクリースには固有間隔が存在し得るものの，これを決める要因についてもわかっていない．本研究では，V字型欠陥を有するに対して二つの異なるアプローチでクリースの発生と伝播の有限要素解析を実施し，逐次的なクリースの発生機構と固有間隔を規定する要因を明らかにする．</p>

DOI： 10.11345/japannctam.66.0_5

CiNii Research

リッジパターン変態のプレストレッチ依存性と分岐座屈特性査読有り

田中大地, 若林駿人, 松原成志朗, 永島壮, 奥村大

計算数理工学論文集 22 巻頁： 117 - 121 2022年