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2. Recent Advances in Triboelectric Nanogenerators: From Technological Progress to Commercial Applications.

Author

Choi, Dongwhi, Lee, Younghoon, Lin, Zong-Hong, Cho, Sumin, Kim, Miso, Ao, Chi, Soh, Siowling, Sohn, Changwan, Jeong, Chang, Lee, Jeongwan, Lee, Minbaek, Lee, Seungah, Ryu, Jungho, Parashar, Parag, Cho, Yujang, Ahn, Jaewan, Kim, Il-Doo, Jiang, Feng, Lee, Pooi, Khandelwal, Gaurav, Kim, Sang-Jae, Kim, Hyun, Song, Hyun-Cheol, Kim, Minje, Nah, Junghyo, Kim, Wook, Menge, Habtamu, Park, Yong, Xu, Wei, Hao, Jianhua, Park, Hyosik, Lee, Ju-Hyuck, Lee, Dong-Min, Kim, Sang-Woo, Park, Ji, Zhang, Haixia, Zi, Yunlong, Guo, Ru, Cheng, Jia, Yang, Ze, Xie, Yannan, Lee, Sangmin, Chung, Jihoon, Oh, Il-Kwon, Kim, Ji-Seok, Cheng, Tinghai, Gao, Qi, Cheng, Gang, Gu, Guangqin, Shim, Minseob, Jung, Jeehoon, Yun, Changwoo, Zhang, Chi, Liu, Guoxu, Chen, Yufeng, Kim, Suhan, Chen, Xiangyu, Hu, Jun, Pu, Xiong, Guo, Zi, Wang, Xudong, Chen, Jun, Xiao, Xiao, Xie, Xing, Jarin, Mourin, Zhang, Hulin, Lai, Ying-Chih, He, Tianyiyi, Kim, Hakjeong, Park, Inkyu, Ahn, Junseong, Huynh, Nghia, Yang, Ya, Wang, Zhong, Baik, Jeong, and Choi, Dukhyun

Subjects
Triboelectric nanogenerator, applications, circuits, device designs, energy harvesting, mechanical energy, mechanical systems, tribomaterials
Abstract

Serious climate changes and energy-related environmental problems are currently critical issues in the world. In order to reduce carbon emissions and save our environment, renewable energy harvesting technologies will serve as a key solution in the near future. Among them, triboelectric nanogenerators (TENGs), which is one of the most promising mechanical energy harvesters by means of contact electrification phenomenon, are explosively developing due to abundant wasting mechanical energy sources and a number of superior advantages in a wide availability and selection of materials, relatively simple device configurations, and low-cost processing. Significant experimental and theoretical efforts have been achieved toward understanding fundamental behaviors and a wide range of demonstrations since its report in 2012. As a result, considerable technological advancement has been exhibited and it advances the timeline of achievement in the proposed roadmap. Now, the technology has reached the stage of prototype development with verification of performance beyond the lab scale environment toward its commercialization. In this review, distinguished authors in the world worked together to summarize the state of the art in theory, materials, devices, systems, circuits, and applications in TENG fields. The great research achievements of researchers in this field around the world over the past decade are expected to play a major role in coming to fruition of unexpectedly accelerated technological advances over the next decade.

Published
2023

24. The Pathway to Intelligence: Using Stimuli‐Responsive Materials as Building Blocks for Constructing Smart and Functional Systems

Author

Zhang, Xuan, primary, Chen, Linfeng, additional, Lim, Kang Hui, additional, Gonuguntla, Spandhana, additional, Lim, Kang Wen, additional, Pranantyo, Dicky, additional, Yong, Wai Pong, additional, Yam, Wei Jian Tyler, additional, Low, Zhida, additional, Teo, Wee Joon, additional, Nien, Hao Ping, additional, Loh, Qiao Wen, additional, and Soh, Siowling, additional

Published
2019
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27. Graphite‐Aligned Ni/Ni(OH)2 Nanowire‐Based Aqueous Asymmetric Supercapacitors Exhibiting Excellent Cycle Stability, High Rate Performance, and Wide Operation Voltage.

Author

Pandey, Rakesh K., Totake, Yuichiro, Soh, Siowling, and Nakanishi, Hideyuki

Subjects
SUPERCAPACITOR electrodes, SUPERCAPACITORS, ELECTRIC potential, HIGH voltages, AQUEOUS electrolytes, OXIDATION-reduction reaction, NANOWIRES
Abstract

We present a new design for an asymmetric supercapacitor combining a vertically aligned Ni/Ni(OH)2 nanowire array electrode and a graphite‐based electrode. The arrangement of these two electrodes in a sandwiched fashion allows the device to function at a high operating voltage window of 2.0 V in an aqueous electrolyte. A thin layer of Ni(OH)2 can be readily formed on Ni nanowires (NiNWs) to yield a Ni/Ni(OH)2 structure. The redox reaction of Ni(OH)2 formed on the surface of NiNWs was crucial in achieving improved capacitance over this wide voltage window. The modification of the graphite electrode using graphene flakes was found to provide a more stable response at high current densities. The shape of the voltammogram can be retained up to high values and thus the device can operate at very rapid charge/discharge rates at an enhanced voltage window. Furthermore, the capacitance was found to be unchanged after 10000 continuous potential cycles. [ABSTRACT FROM AUTHOR]

Published
2019
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36. Dynamic self-assembly in ensembles of camphor boats

Author

Soh, Siowling, Bishop, Kyle J.M., and Grzybowski, Bartosz A.

Subjects
Camphor -- Research, Chemicals, plastics and rubber industries
Abstract

The dynamics of the self-assembled system formed by the millimeter-sized gel particles loaded with camphor and floating at the interface between water and air that generate convective flows around them are demonstrated. The threshold transition of the system from free moving to organized assemblies of particles offer insights into the subtle interplay between the forces agitating/propelling the particles and the repulsive interactions set up between particles and the confining boundary.

Published
2008

45. Soft stimuli-responsive grippers and machines with high load-to-weight ratiosElectronic supplementary information (ESI) available. See DOI: 10.1039/c8mh00888d

Author

SunThese authors contributed equally to this work., Yajuan, Chen, Linfeng, Jiang, Yan, Zhang, Xuan, Yao, Xiukai, and Soh, Siowling

Abstract

Soft untethered grippers and machines are emerging fields of research due to their wide range of desirable properties and capabilities over traditional hard robots. Stimuli-responsive hydrogels are naturally soft and untethered (i.e., they respond to a signal from the environment); however, they are not used as grippers due to the weak mechanical properties of the hydrogels. This manuscript describes the fabrication of a general class of stimuli-responsive grippers that are soft and untethered. Each gripper is composed of a stimuli-responsive hydrogel with a hole in the middle for gripping onto objects and a layer of coating around its sides. Importantly, these grippers exert surprisingly large gripping forces relative to their weights—∼10 000, which is the highest reported in the literature for a gripper. This high load-to-weight ratio is unexpected because the stimuli-responsive hydrogel is soft, not tethered to any external supply of energy, and fabricated by simple methods. The approach is general: high load-to-weight ratios were achieved for both pH- and temperature-responsive hydrogels. As soft grippers, they gripped onto objects of different shapes and sizes easily. A class of soft untethered machines can be fabricated by assembling these soft grippers with different modular blocks of stimuli-responsive hydrogels for performing complex operations.

Published
2019
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