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One-step and Continuous Fabrication of Coaxial Piezoelectric Fiber for Sensing Application

Chinese Journal of Polymer Science 2023年第11期41卷 1778-1785,I0009页

作者： Shuai-Shuai Gui Bing-Xu Da Fei Peng Guo-Qiang Zheng Kun Dai Chun-Tai Liu Chang-Yu Shen College of Materials Science and Engineering Key Laboratory of Material Processing and Mold(Ministry of Education)Henan Key Laboratory of Advanced Nylon Materials and ApplicationZhengzhou UniversityZhengzhou 450001China

Although there has been rapid advancement in piezoelectric sensors,challenges still remain in developing wearable piezoelectric sensors by a one-step,continuous and environmentally friendly *** this work,a 1D flexible coaxial piezoelectric fiber was directly fabricated by melt extrusion molding,whose core and sheath layer are respectively slender steel wire(i.e.,electrode)and PVDF(i.e.,piezoelectric layer).Moreover,such 1D flexible coaxial piezoelectric fiber possesses short response time and high sensitivity,which can be used as a selfpowered sensor for bending and vibration *** interestingly,such 1D flexible coaxial piezoelectric fiber(1D-PFs)can be further endowed with 3D helical ***,a wearable and washable motion monitoring system can be constructed via braiding such 3D helical piezoelectric fiber(3D-PF)into commercial *** work paves a new way for developing 1D and 3D piezoelectric fibers through a one-step,continuous and environmentally friendly method,showing potential applications in the field of sensing and wearable electronics.

关键词： Coaxial piezoelectric fiber melt extrusion molding Bending and vibration sensing Motion monitoring system

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Development of lunar regolith-based composite for in-situ 3D printing via high-pressure extrusion system

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机械工程前沿:英文版 2023年第2期18卷 253-266页

作者： Hua ZHAO Jihong ZHU Shangqin YUAN Shaoying LI Weihong ZHANG State IJR Center of Aerospace Design and Additive Manufacturing School of Mechanical EngineeringNorthwestern Polytechnical UniversityXi’an 710072China Key Laboratory of Metal High Performance Additive Manufacturing and Innovative Design MIIT ChinaNorthwestern Polytechnical UniversityXi’an 710072China Unmanned System Research Institute Northwestern Polytechnical UniversityXi’an 710072China

To fully utilize the in-situ resources on the moon to facilitate the establishment of a lunar habitat is significant to realize the long-term residence of mankind on the moon and the deep space exploration in the ***,intensive research works have been conducted to develop types of 3D printing approach to adapt to the extreme environment and utilize the lunar regolith for in-situ ***,the in-situ 3D printing using raw lunar regolith consumes extremely high energy and *** this work,we proposed a cost-effective melting extrusion system for lunar regolith-based composite printing,and engineering thermoplastic powders are employed as a bonding agent for lunar regolith *** high-performance nylon and lunar regolith are uniformly pre-mixed in powder form with different weight *** high-pressure extrusion system is helpful to enhance the interface affinity of polymer binders with lunar regolith as well as maximize the loading ratio of in-situ resources of lunar *** properties such as tensile strength,elastic modulus,and Poisson’s ratio of the printed specimens were evaluated ***,the impact performance was emphasized to improve the resistance of the meteorite impact on the *** maximum tensile strength and impact toughness reach 36.2 MPa and 5.15 kJ/m2,*** melt extrusion for lunar regolith composite can increase the effective loading fraction up to 80 wt.% and relatively easily adapt to extreme conditions for in-situ manufacturing.

关键词： in-situ resource utilization melt extrusion molding lunar regolith-based composites mechanical properties additive manufacturing

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