Article
Polymer Science
Jaehyon Kim, Yewon Kim, Jaebeom Lee, Mikyung Shin, Donghee Son
Summary: In wearable bioelectronics, the quality of physiological signals can be improved by using conductive composites and hydrogel structures to address the slipping issues and achieve stable adhesion of the electrodes. This study measured EMG signals using a three-layered hydrogel structure and demonstrated accurate classification based on hand movements and robot arm control.
Article
Polymer Science
Kyuha Park, Heewon Choi, Kyumin Kang, Mikyung Shin, Donghee Son
Summary: In this study, a soft stretchable conductive hydrogel composite with good electrical and mechanical properties was reported. This material can stably sense physiological signals and provide feedback regulation in unstable biotic-abiotic interfaces.
Article
Nanoscience & Nanotechnology
Yong An, Hongquan Wang, Zhigao Yang, Jingxian Yu, Shengping Wang
Summary: An integrated configuration of organic active material electrode-solid polymer electrolyte has been synthesized via in situ polymerization. The use of a bridge - the naphthalene urethane bond - improves the Li+ transport at the electrode/SPE interface, resulting in enhanced electrochemical and safety performance of the battery.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Chemistry, Physical
Anton Tuluk, Hans Brouwer, Sybrand van der Zwaag
Summary: This study investigates the suppression of secondary phases in BiFeO3 by varying the compositional parameters and sintering temperature. The addition of a small amount of Bi2O3 prevents the formation of secondary phases and results in the synthesis of pure-phase BiFeO3 ceramic with low electrical conductivity.
Article
Thermodynamics
Jun Wang, Chunrui Shao, Haiyang Li, Guodong Xia
Summary: This paper introduces the thermal rectification effect and its application in a bi-segment thermal rectifier. By introducing zigzag-structure interfaces into the system, the thermal rectification ratio can be improved, enhancing the thermal rectification effect. The finite element method is used for numerical calculations, and the heat flux through the system is calculated based on Fourier's law. The results show that the zigzag interface can increase the thermal rectification ratio by more than 36% compared to a flat interface.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2022)
Article
Chemistry, Analytical
Andrey Briko, Vladislava Kapravchuk, Alexander Kobelev, Ahmad Hammoud, Steffen Leonhardt, Chuong Ngo, Yury Gulyaev, Sergey Shchukin
Summary: The study examines the simultaneous acquisition and analysis of different signals during basic wrist movements, revealing that the comprehensive real-time analysis of EI, EMG, and FMG signals potentially supports anthropomorphic control systems with an acceptable delay.
Article
Nanoscience & Nanotechnology
Islam Shancita, Colton Cagle, Irina Kalish, Pascal Dube, Joseph Abraham, Bradford Hammond, Juliusz Warzywoda, Michelle L. Pantoya
Summary: Surface modification techniques can be used to create effective thermal barrier coatings on metallic substrates, inducing surface chemical reactions to dramatically reduce thermal transport properties. The study demonstrates that surface oxidation reactions can lead to significant alterations in the thermal properties of metal substrates, with reactions occurring within a 20 μm layer.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Thermodynamics
Jiawei Yang, Wei Yu, Yuan Zhang, Changqing Liu, Huaqing Xie
Summary: The article introduces a novel thermal interface material obtained by incorporating graphene into a polyacrylate-based double cross-linked hydrogel, which exhibits low thermal contact resistance, high thermal conductivity, excellent elasticity, and self-healing properties, meeting the requirements of a dynamic working environment. The study found that under certain pressure, the effect of temperature on thermal contact resistance is minor, indicating the excellent thermal management performance of the composite hydrogel.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2021)
Article
Chemistry, Multidisciplinary
Amanda Guenther, Hilger Lohringer, Dirk Mueller, Elmar Schmidbauer, Christa Springsklee
Summary: Impedance spectroscopy was used to distinguish between bulk and grain boundary effects on polycrystalline VO2 samples near the metal-insulator transition temperature. While there is extensive literature on the electrical properties of VO2 thin films and nanowires, there is a lack of studies separating bulk and grain boundary effects. The structure of grain boundaries in polycrystalline samples is different from that in macroscopic samples, but provides valuable information on electrical conduction. Grain boundary processes in VO2 samples could be measured at room temperature to the transition temperature, while bulk properties and grain boundary conduction could only be studied at low temperatures.
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
(2022)
Article
Materials Science, Ceramics
Ashutosh Kumar, Artur Kosonowski, Piotr Wyzga, Krzysztof T. Wojciechowski
Summary: This study presents a novel approach to reduce thermal conductivity in thermoelectric composite materials using acoustic impedance mismatch and the Debye model, and investigates the correlation between interface thermal resistance and particle size on the thermal conductivity of the composite. Experimental results show a significant reduction in thermal conductivity of the composite when the particle size of the dispersed phase is smaller than a certain value, providing new directions for engineering composite thermoelectric systems with desired thermal conductivity.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2021)
Article
Polymer Science
Zhujian Wu, Jiajie Zhang, Qingqing Lin, Yutian Zhu, Lian Wang, Yongjin Li
Summary: The tough hydrogel sensor with hydrogen-bonding network and slidable crosslinking shows outstanding stretchability, excellent recoverable performance, and high compressive strength. The Li-ion based hydrogel exhibits high sensitivity to a wide range of compressive strain and can be utilized to detect human motions.
Article
Materials Science, Multidisciplinary
Kai Feng, Guodan Wei, Mengfan Lu, Naiwei Gao, Yapei Wang, Zhaoxia Jin
Summary: Using cellulose nanocrystals as a skeleton, the dispersion of conjugated polymers in near-infrared composites can be optimized to improve photothermal conversion efficiency. Additionally, the CNC-based materials exhibit chiral-optical properties, making them suitable for developing unique multifunctional sensors.
JOURNAL OF MATERIALS CHEMISTRY C
(2022)
Article
Chemistry, Multidisciplinary
Christine Arndt, Margarethe Hauck, Irene Wacker, Berit Zeller-Plumhoff, Florian Rasch, Mohammadreza Taale, Ali Shaygan Nia, Xinliang Feng, Rainer Adelung, Rasmus R. Schroeder, Fabian Schuett, Christine Selhuber-Unkel
Summary: The study presents a novel approach to fabricate hydrogel composites with outstanding electrical conductivity by microengineering graphene and polyacrylamide. The method allows for combining excellent conductivity of graphene with adaptable mechanical properties of polyacrylamide, while maintaining the original properties of the matrix. This approach shows promise for applications in bioelectronics and biohybrid robotics.
Article
Polymer Science
Jihyang Song, Yewon Kim, Kyumin Kang, Sangkyu Lee, Mikyung Shin, Donghee Son
Summary: In this study, a conducting composite material was developed by mixing a self-healing polymer and graphene. The material showed self-healing properties without the need for external stimuli and had rapid electrical recovery from mechanical damage. It also demonstrated stable electrical endurance even under high strain conditions. Additionally, the composite was used to measure electromyogram signals and control the movement of a robot's hand.
Article
Engineering, Environmental
Xiangdong Wang, Xiaoyu Wang, Menghan Pi, Rong Ran
Summary: This paper presents a new method to balance the electrical conductivity and mechanical strength of materials by embedding HEC in hydrogel, resulting in an organic hydrogel with high strength and high conductivity. Additionally, temperature-sensitive particles were added to prepare temperature-sensitive conductive fibers for multiple sensors in the future.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Physics, Multidisciplinary
P. S. Simonario, T. M. de Andrade, F. C. M. Freire
BRAZILIAN JOURNAL OF PHYSICS
(2016)
Article
Chemistry, Analytical
T. de Andrade, F. C. M. Freire, G. Barbero, A. L. Alexe-Ionescu
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
(2016)
Article
Chemistry, Analytical
F. C. M. Freire, T. M. Andrade
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
(2016)
Article
Chemistry, Physical
Arthur E. T. Silva, Thiago M. Andrade, Fernando C. M. Freire
JOURNAL OF PHYSICAL CHEMISTRY C
(2017)
Article
Physics, Applied
F. C. M. Freire, C. Dascalu, R. Atasiei, A. L. Alexe-Ionescu, G. Barbero
APPLIED PHYSICS LETTERS
(2011)
Article
Physics, Applied
A. L. Alexe-Ionescu, R. Atasiei, C. Dascalu, F. C. M. Freire, G. Barbero
APPLIED PHYSICS LETTERS
(2011)
Article
Chemistry, Physical
G. Barbero, F. C. M. Freire, M. Scalerandi
EUROPEAN PHYSICAL JOURNAL E
(2009)
Article
Chemistry, Multidisciplinary
Evgeny Pozhidaev, Fernando C. M. Freire, Cesar Augusto Refosco Yednak, Alfredo Strigazzi, Sofia Torgova, Vadim Molkin, Maxim Minchenko
MOLECULAR CRYSTALS AND LIQUID CRYSTALS
(2011)
Article
Physics, Fluids & Plasmas
R. S. Mendes, H. V. Ribeiro, F. C. M. Freire, A. A. Tateishi, E. K. Lenzi
Article
Physics, Fluids & Plasmas
F. M. C. Freire, N. M. Kimura, D. D. Luders, A. J. Palangana, M. Simoes
Article
Physics, Multidisciplinary
P. S. Simonario, F. C. M. Freire, L. R. Evangelista, R. T. Teixeira-Souza
Article
Biophysics
A. L. Alexe-Ionescu, G. Barbero, F. C. M. Freire, R. Merletti
PHYSIOLOGICAL MEASUREMENT
(2010)
Review
Chemistry, Physical
A. J. Santana, A. E. T. Silva, A. R. Duarte, T. M. Andrade, F. C. M. Freire
JOURNAL OF MOLECULAR LIQUIDS
(2019)
Proceedings Paper
Computer Science, Artificial Intelligence
Guilherme Enoc Egas de Carvalho, Franklin Cesar Flores, Fernando Carlos Messias Freire, Anderson Reginaldo Sampaio
PROCEEDINGS OF THE 2014 9TH INTERNATIONAL CONFERENCE ON COMPUTER VISION THEORY AND APPLICATIONS (VISAPP), VOL 1
(2014)