Article
Engineering, Electrical & Electronic
Masaaki Hashimoto, Takaya Sato, Yoshihiro Taguchi
Summary: This paper presents an additive manufacturing method for an electrothermally controllable 4D-printed bimorph microactuator. The method involves 3D printing using two-photon polymerization and injecting liquid metal to create an electrical heater. A vertical-spiral-shaped electrothermal 4D rotary microactuator with large angular displacement was successfully fabricated and characterized. The proposed method enhances the design flexibility of electrothermal microactuators and has potential applications in soft microrobotics.
SENSORS AND ACTUATORS A-PHYSICAL
(2023)
Article
Chemistry, Analytical
Margarita Tecpoyotl-Torres, Pedro Vargas-Chable, Jesus Escobedo-Alatorre, Luis Cisneros-Villalobos, Josahandy Sarabia-Vergara
Summary: This study modified a V-shaped microactuator and investigated its effects on force and displacement. The results showed that the proposed microactuator had a significant increase in force compared to a similar microactuator and a V-shaped microactuator, while the displacement slightly decreased. When applied to a microgripper, the modified microactuator also contributed to an increase in displacement, force, and natural frequency, without reaching critical temperatures for microobjects.
Article
Automation & Control Systems
Xiao Long, Zhao Jun, Botao Zhang, Dongdong Chen, Wu Liang
Summary: This article presents a unified electrothermal behavior modeling method for SiC MOSFET and GaN HEMT, with a parameter extraction method based on modeling data and optimization algorithm. The proposed modeling method has been verified through simulation and experiment, showing its correctness and applicability to several commercially available devices.
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
(2021)
Article
Engineering, Electrical & Electronic
Salvatore Race, Aron Philipp, Michel Nagel, Thomas Ziemann, Ivana Kovacevic-Badstuebner, Ulrike Grossner
Summary: This article proposes a new step-back-correction technique to reduce computational cost for electrothermal simulations of multichip power modules, while considering the importance of thermal conductivity. The proposed method was validated through COMSOL simulations and infrared camera measurements.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2022)
Article
Materials Science, Multidisciplinary
Wang Zhenlu, Zhang Jiue, Ma Shuxia, Liu Guangqiao
Summary: This paper presents a temperature distribution and unload displacement model of a Z-shaped electrothermal microactuator, and validates the accuracy of the model through experimental and finite element analysis. It is found that the shape of the actuator has no effect on the maximum temperature, while the unload displacement and output force depend on the beam length and inclined angle of the actuator.
Article
Engineering, Multidisciplinary
Muhammad Owais Tariq, Jameel Ahmed, Shafaat Ahmed Bazaz
Summary: The typical technique of hardness testing of pharmaceutical microcapsules using pressure transducer-based bulky devices by averaging mechanism often produces imprecise results and causes wastage of costly core material. To address these issues, a miniaturized version of the device using a MEMS-based microgripper with a maximum rupture force of 13.33 mN has been proposed. The microgripper, designed with a hybrid chevron thermal actuator and integrated capacitive force sensor, can mechanically characterize single microcapsules ranging from 5 μm to 20 μm.
MEASUREMENT SCIENCE AND TECHNOLOGY
(2023)
Article
Energy & Fuels
Ciro Scognamillo, Antonio Pio Catalano, Michele Riccio, Vincenzo D'Alessandro, Lorenzo Codecasa, Alessandro Borghese, Ravi Nath Tripathi, Alberto Castellazzi, Giovanni Breglio, Andrea Irace
Summary: In this paper, an advanced electrothermal simulation strategy is applied to study a 3.3 kV silicon carbide MOSFET power module, and simulate a synchronous step-up DC-DC converter and a single-phase inverter. Good accuracy is ensured by considering electromagnetic effects and nonlinear thermal effects, enabling effortless quantification of the impact of key parameters.
Article
Materials Science, Multidisciplinary
Min-Yeong Kim, Hee-Jae Lee, Dong-Wook Byun, Seung-Woo Jung, Myeong-Cheol Shin, Michael A. Schweitz, Sang-Mo Koo
Summary: This study analyzes the effects of annealing on the electrothermal properties of Gallium Oxide (Ga2O3) thin films. The results show that the annealed sample has high current performance with a slight temperature rise.
Article
Materials Science, Composites
Xin Tao, Dongxue Tian, Shanqing Liang, Longfei Zhang, Shanming Li, Feng Fu
Summary: Wet treatment significantly affects the bonding strength and electrothermal performance of electrothermal plywood bonded with EPI adhesive. Wet treatment leads to a decrease in bonding strength, hydrolysis of the adhesive layer, increased wood failure percentage, increased resistance, and reduced electric-to-radiant transfer efficiency.
POLYMER COMPOSITES
(2023)
Article
Materials Science, Multidisciplinary
V. S. Kuzevanov, S. S. Zakozhurnikov, G. S. Zakozhurnikova
Summary: This study focuses on the computational investigation of the efficiency of the SIC synthesis process in an electrothermal fluidized bed. The effects of operating temperature and loading options on the reaction yield are examined. The entrainment effect of volatile products in the chemical reactions is shown to impact the silicon carbide yield, while the properties of carbon-containing particles mainly determine the synthesis time. Furthermore, the ratio of carbon-containing particles involved in the SIC formation reaction to those associated with evaporating SiO2 particles is found to have a fundamental effect on the synthesis efficiency.
JOURNAL OF MATERIALS SCIENCE
(2023)
Article
Mechanics
Chaojie Gao, Lei Guan, Yutao Shi, Jianqiu Zhou, Rui Cai
Summary: This paper proposes an analytical calculation method for diffusion-induced stress in a layered electrode of lithium-ion batteries, which is composed of a current collector and a nanocomposite active plate. The mechanical properties of the active plate, reinforced by graphene nanosheets (GNSs), are predicted using the Mori-Tanaka micromechanical method. The agglomeration of reinforced GNSs in the matrix poses certain obstacles to reducing the overall stress level of the anode.
Article
Materials Science, Multidisciplinary
Helapiyumi Weerathunga, Thu Trang Do, Hong Duc Pham, Robert Jones, Jennifer MacLeod, TaeYoung Kim, Deepak Dubal
Summary: A freestanding, ultra-flexible, and washable joule heater was developed using a biocompatible poly(styrene-isoprene-styrene) (SIBS) polymer as binder and carbon black (CB) as heating material. The heater exhibited a minimum resistivity and conductivity of 26 m omega cm and 7.4 S cm(-1), respectively. It also demonstrated excellent stability and performance even after mechanical property tests such as bending, repetitive bending, twisting, and washing.
ADVANCED MATERIALS TECHNOLOGIES
(2023)
Article
Materials Science, Ceramics
Lianzhong Zhao, Xiaofeng Wang, Huiwen Xiong, Kechao Zhou, Dou Zhang
Summary: The utilization of a small amount of thermoplastic polymer in preceramic polymers improves formability in additive manufacturing of 3D structured ceramics, enhancing compatibility and homogeneity in the mixture. This strategy is not only effective for SiC ceramics, but also applicable to a wide range of ceramic systems with appropriate precursors.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2021)
Article
Physics, Applied
Monan Ma, K. L. Ekinci
Summary: We investigated the electrothermal actuation of nanomechanical motion using numerical simulations and analytical solutions. The structure of the nanoelectrothermal actuator consists of a U-shaped gold nanoresistor patterned on the anchor of a doubly clamped nanomechanical beam or a microcantilever resonator. Our finite-element analysis based model efficiently combines transient and frequency-domain analyses to calculate the temperature and displacement fields over a wide range of actuation frequencies and amplitudes. We validated our model by comparing the numerical results with experimental measurements of displacement amplitudes in vacuum.
JOURNAL OF APPLIED PHYSICS
(2023)
Article
Engineering, Electrical & Electronic
Long Li, Peiqi Ge
Summary: This paper presents an analytical model of the stress field in scratching single-crystal silicon and analyzes the driving stress of crack. It provides insights into the anisotropic properties of single-crystal silicon and the effect of scratching stress field on crack nucleation. The study contributes to refining the parameters of the scratching process and controlling the surface damage in scratching hard and brittle crystalline materials.
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
(2022)