Faculty Profiles - UENO Tomonaga

Papers - UENO Tomonaga

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High-speed and scalable combustion fabrication of ultralight carbon nanotube aerogels below air density Reviewed

Yanagi, R; Okuno, A; Ueno, T

CARBON Vol. 216 2024.1

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

In this study, we introduce a fast, scalable method to fabricate ultralight carbon nanotube (CNT) aerogels with a bulk density (ρ) lower than air, using a combustion process. Typical fabrication methods for ultralight nanocarbon aerogels (ρ ≤ 1.0 mg cm−3) often involve intricate steps, such as high-temperature annealing and thermal reduction. These processes are time-consuming and pose scalability challenges. Here, we propose a high-speed fabrication process for ultralight CNT aerogels by combusting cellulose nanofibers (CNF) as a sacrificial template. The combustion process for CNT/CNF composite aerogels in an open environment takes only a few seconds, and the fabricated CNT aerogels with a lower-than-air density (ρ ≥ 0.48 mg cm−3) have high light absorption and good thermal and mechanical stability. We further illustrate the capability of these ultralight CNT aerogels to achieve levitation upon heating like a hot air balloon. Ultralight CNT aerogels capable of levitation by heating, fabricated by our fast and scalable method, hold the potential to replace traditional motor-driven unmanned aerial vehicles and conventional stratospheric platforms, such as high-altitude balloons, with sunlight-driven materials.

DOI： 10.1016/j.carbon.2023.118572

Web of Science

Scopus

Light-induced levitation of ultralight carbon aerogels via temperature control Reviewed

Scientific Reports Vol. 11 ( 1 ) 2021.6

Color-Changing Paper: Cellulose Nanofiber Films Incorporating Mechanochromic Fluorenylidene-Acridane Reviewed

Keisuke Ogumi, Takehiro Arakawa, Bungo Okudera, Yuki Takimoto, Kohki Nagata, Kentaro Mishiba, Eiji Abe, Tomonaga Ueno, Junko Hieda, Kenji Omote, Hao-Sheng Lin, and Yutaka Matsuo

ACS Applied Engineering Materials Vol. 2 ( 2 ) page： 397 - 403 2024.1

Basic study on improvement of electromagnetic wave absorption for ultra-lightweight materials by insulation of CNT surface

IEICE Technical Report; IEICE Tech. Rep. Vol. 123 ( 283 ) page： 24 - 28 2023.11

Synergistic flame retardancy of solid acid, hindered N-alkoxy amine, and halogen compound for polypropylene Reviewed

Nakashima, E; Hosokawa, Y; Ueno, T

JOURNAL OF APPLIED POLYMER SCIENCE Vol. 140 ( 41 ) 2023.11

Authorship：Last author,　Corresponding author Language：English Publishing type：Research paper (scientific journal) Publisher：Journal of Applied Polymer Science

Polypropylene (PP) is a thermoplastic resin widely used in various industrial applications. However, the flammability of PP is a severe drawback that lowers operational safety. This study demonstrates the development of flame-retardant PP. The co-adding with various solid acids and a hindered N-alkoxy amine (NOR116 – Flamestab® NOR 116 FF) affects the combustion behavior of PP in a vertical flame test. The co-adding of silica alumina (SA) and NOR116 with PP promoted the melt drip, suppressed upward combustion heat, and shorter the combustion time. The decomposition products of NOR116 induced the cleavage of the main chain of PP, and it quenched the radicals on the surface of the SA particles because SA has abundant acidic sites and large pores, facilitating the adsorption of a substantial quantity of NOR116. The molecular weight of PP was controlled to 103 ~ 104 before the combustion to achieve an increase in the melt flow ability and suppress the upward combustion. Furthermore, a small amount of a halogen-based flame retardant was incorporated into the PP/SA/NOR116 sample, and the specimens could instantly self-extinguish on the gas phase by radical trap.

DOI： 10.1002/app.54511

Web of Science

Scopus

A study on flat-plate electromagnetic field modeling of electromagnetic wave absorbing and shielding materials using CNTs Invited Reviewed

Eiji Kurumada, Sho Muroga, Motoshi Tanaka, Tomonaga Ueno, Reo Yanagi, Kishio Hidaka, Akira Ito, Shuhei Shimada, Johta Awano, Osamu Kawasaki

IEICE Technical Report; IEICE Tech. Rep. Vol. 122 ( 206 ) page： 68 - 71 2022.10

Ultralight Single-Walled Carbon Nanotube Aerogels for Low-Frequency Sound Absorption Reviewed

Yanagi, R; Segi, T; Oda, R; Ueno, T

ADVANCED ENGINEERING MATERIALS Vol. 24 ( 9 ) page： 2200357 2022.9

Language：English Publishing type：Research paper (scientific journal) Publisher：Advanced Engineering Materials

Absorbing low-frequency sound below 1000 Hz with an ultralight material is a critical challenge. Nanofibrous sound-absorbing materials have many interfaces for air-borne sound loss. In addition, nanofibers with a high elastic modulus can increase the loss of sound propagating in the solid, enabling good, low-frequency sound absorption. Herein, a composite aerogel based on single-walled carbon nanotubes (SWCNTs) and carboxymethyl cellulose (CMC) as an ultralight material that effectively absorbs low-frequency sound is reported. This ultralight aerogel has a hierarchical porous structure composed of high-modulus SWCNT–CMC composite nanofibers. A sample with an areal density of 20 mg cm−2 (bulk density: 5 mg cm−3, thickness: 39 mm) achieves a sound-absorption coefficient of 0.44 at 500 Hz. The sound-absorption behavior is sufficiently described by the Biot–Johnson–Champoux–Allard model, indicating the significant effect of the high elastic modulus of the nanofibers on the sound-absorption performance. The article presents a new design principle for ultralight materials with low-frequency sound absorption that takes into consideration both the porous structure and the elastic modulus of the material framework.

DOI： 10.1002/adem.202200357

Web of Science

Scopus

Carbon-nanotube-based ultralight materials for ultrabroadband electromagnetic wave shielding and absorption Reviewed

Yanagi R., Segi T., Ito A., Ueno T., Hidaka K.

Japanese Journal of Applied Physics Vol. 60 ( 8 ) 2021.8

Elastic recovery properties of ultralight carbon nanotube/ carboxymethyl cellulose composites Reviewed

Matsushima K., Ono K., Yanagi R., Shioura N., Segi T., Ueno T.

Materials Vol. 14 ( 14 ) 2021.7

Image analysis of flame behavior for polyolefins and polystyrene in vertical flame test Reviewed

Hosokawa Yoshifumi, Nakashima Erika, Ueno Tomonaga

JOURNAL OF APPLIED POLYMER SCIENCE Vol. 138 ( 1 ) 2021.1

Fabrication and Characterization of Porous Silica/Carbon Nanotube Composite Insulation Reviewed

Shioura Naoto, Matsushima Kazuki, Osato Tomoki, Ueno Tomonaga, Isu Norifumi, Hashimoto Takeshi, Yana Takumi

MRS ADVANCES Vol. 5 ( 33-34 ) page： 1791 - 1798 2020

Pattern Formation in Heterostructured Gel by the Ferrocyanide-lodate-Sulfite Reaction Reviewed

Ueno Tomonaga, Yoshida Ryo

JOURNAL OF PHYSICAL CHEMISTRY A Vol. 123 ( 24 ) page： 5013 - 5018 2019.6

Solution Plasma Reactions and Materials Synthesis

Panomsuwan, G; Ueno, T; Yui, H; Nakamura, J; Saito, N

MOLECULAR TECHNOLOGY, VOL 3: MATERIALS INNOVATION page： 137 - 172 2019

Mechanistic aspect based on the role of reactive oxidizing species (ROS) in macroscopic level on the glycerol photooxidation over defected and defected-free TiO2 Reviewed

Jedsukontorn Trin, Ueno Tomonaga, Saito Nagahiro, Hunsom Mali

JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY Vol. 367 page： 270 - 281 2018.12

Narrowing band gap energy of defective black TiO2 fabricated by solution plasma process and its photocatalytic activity on glycerol transformation

Jedsukontorn Trin, Ueno Tomonaga, Saito Nagahiro, Hunsom Mali

JOURNAL OF ALLOYS AND COMPOUNDS Vol. 757 page： 188 - 199 2018.8

In vitro cytotoxicity of carbon black nanoparticles synthesized from solution plasma on human lung fibroblast cells

Panomsuwan Gasidit, Chokradjaroen Chayanaphat, Rujiravanit Ratana, Ueno Tomonaga, Saito Nagahiro

JAPANESE JOURNAL OF APPLIED PHYSICS Vol. 57 ( 1 ) 2018.1

Solution Plasma Process-Derived Defect-Induced Heterophase Anatase/Brookite TiO2 Nanocrystals for Enhanced Gaseous Photocatalytic Performance

Pitchaimuthu Sudhagar, Honda Kaede, Suzuki Shoki, Naito Akane, Suzuki Norihiro, Katsumata Ken-ichi, Nakata Kazuya, Ishida Naoya, Kitamura Naoto, Idemoto Yasushi, Kondo Takeshi, Yuasa Makoto, Takai Osamu, Ueno Tomonaga, Saito Nagahiro, Fujishima Akira, Terashima Chiaki

ACS OMEGA Vol. 3 ( 1 ) page： 898 - 905 2018.1

Facile preparation of defective black TiO2 through the solution plasma process: Effect of parametric changes for plasma discharge on its structural and optical properties

Jedsukontorn Trin, Ueno Tomonaga, Saito Nagahiro, Hunsom Mali

JOURNAL OF ALLOYS AND COMPOUNDS Vol. 726 page： 567 - 577 2017.12

Simple introduction of carboxyl head group with alkyl spacer onto multiwalled carbon nanotubes by solution plasma process

Nemoto Shimpei, Ueno Tomonaga, Watthanaphanit Anyarat, Hieda Junko, Bratescu Maria Antoaneta, Saito Nagahiro

JAPANESE JOURNAL OF APPLIED PHYSICS Vol. 56 ( 9 ) 2017.9

Solution plasma synthesis of a boron-carbon-nitrogen catalyst with a controllable bond structure

Lee SeungHyo, Heo YongKang, Bratescu Maria Antoaneta, Ueno Tomonaga, Saito Nagahiro

PHYSICAL CHEMISTRY CHEMICAL PHYSICS Vol. 19 ( 23 ) page： 15264 - 15272 2017.6

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Papers - UENO Tomonaga