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Preparation and Thermoelectric Properties of SiO_2/β-Zn_4Sb_3 nanocomposite materials

Journal of Wuhan University of Technology(materials Science) 2009年第5期24卷 694-697页

作者：阮学锋 Nanoscience and Technology Center Wuhan University

A series of SiO2/β-Zn4Sb3 core-shell composite particles with 3, 6, 9, and 12 nm of SiO2 shell in thickness were prepared by coatingβ-Zn4Sb3 microparticles with SiO2 nanoparticles formed by hydrolyzing the tetraethoxysilane in alcohol-alkali-water solution. SiO2/β-Zn4Sb3 nanocomposite thermoelectric materials were fabricated with these core-shell composite particles by spark plasma sintering （SPS） method. Microstructure, phase composition, and thermoelectric properties of SiO2/β-Zn4Sb3 nanocomposite thermoelectric materials were systemically investigated. The results show thatβ-Zn4Sb3 microparticles are uniformly coated by SiO2 nanoparticles, and no any phase transformation reaction takes place during SPS process. The electrical and thermal conductivity gradually decreases, and the Seebeck coefficient increases compared to that ofβ-Zn4Sb3 bulk material, but the increment of Seebeck coefficient in high temperature range remarkably increases. The thermal conductivity of SiO2/β-Zn4Sb3 nanocomposite material with 12 nm of SiO2 shell is the lowest and only 0.56 W·m^-1·K^-1 at 460 K. As a result, the ZT value of the SiO2/β-Zn4Sb3 nanocomposite material reaches 0.87 at 700 K and increases by 30%.

关键词： nanocomposite material β-Zn4Sb3 nanoengineering of particle surface thermoelectric properties

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Infusing High-density Polyethylene with Graphene-Zinc Oxide to Produce Antibacterial nanocomposites with Improved Properties

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Chinese Journal of Polymer Science 2020年第8期38卷 898-907,I0008页

作者： You-Li Yao Manuel Reves De Guzman Hong Duan Chen Gao Xu Lin Yi-Hua Wen Juan Du Li Lin Jui-Chin Chen Chin-San Wu Maw-Cherng Suen Ya-Li Sun Wei-Song Hung Chi-Hui Tsou material Corrosion and Protection Key Laboratory of Sichuan Province Sichuan University of Science and EngineeringZigong 643000China Department of Orthopedics West China School of Medicine/West China HospitalSichuan UniversityChengdu 610041China Department of Orthopedics Fourth People's Hospital of ZigongZigong 643000China Department of materials and Textiles Oriental Institute of TechnologyNew Taipei City 22061China Department of Applied Cosmetology Kao Yuan UniversityKaohsiung 82101China Department of Fashion Business Administration Lee-Ming Institute of TechnologyNew Taipei City 24305China Graduate Institute of Applied Science and Technology Department of Materials Science and EngineeringNational Taiwan University of Science and TechnologyTaipei 10607China R&D Center for Membrane Technology Department of Chemical EngineeringChung Yuan UniversityChung-Li 32023China Sichuan Zhixiangyi Technology Co. Ltd.Chengdu 610051China Department of materials Science Chulalongkorn UniversityBangkok 10330Thailand

nanocomposites of high-density polyethylene(HDPE)modified with 0.2 phr graphene-zinc oxide(GN-ZnO)exhibited optimal mechanical properties and thermal *** other nano-materials—GN and nano-ZnO—were also used to compare them with *** the content of GN-ZnO gradually enhanced the antibacterial and barrier properties,but the addition of 0.3 phr GN-ZnO led to agglomeration that caused defects in the ***,we investigated the antibacterial and barrier properties of HDPE nanocomposites infused with different nanoparticles(GN,ZnO,GN-ZnO)of varying *** and the nanoparticles were meltblended together in a Haake-Buchler Rheomixer to produce a new environment-friendly nano-material with improved physical and chemical *** following characterizations were conducted:tensile test,thermogravimetric analysis,morphology,differential scanning calorimetry,X-ray diffraction,antibacterial test,and oxygen and water vapor permeation *** results showed that the crystallinity of HDPE was affected with the addition of GN-ZnO,and the nanocomposites had effective antibacterial capacity,strong mechanical properties,high thermal stability,and excellent barrier *** type of HDPE nanocomposites reinforced with GN-ZnO would be attractive for packaging industries.

关键词： High-density polyethylene Zinc oxide nanocomposite material Antibacterial properties Barrier performance

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Experimental Study on Improving the Bearing Raceway’s Surface Morphology

Experimental Study on Improving the Bearing Raceway’s Surfa...

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Fifth International Conference on Surface Engineering

作者： Wu Mingyuan1 Yang Wei1 Yang Ting2 1 School of Mechatronics Engineering Henan University of Science and Technology Henan Luoyang China 2 School of Electrical and Automation Tianjin University Tianjin China

The surface morphology of raceway is one of the key factors for the bearing’s vibration and *** paper proposes a novel method,which is using the nanocomposite chemical grinding reagent to deal with the surface of the bearing’s friction *** the nanocomposite material’s physical and chemical characteristics,the method integrates the mechanical grind and chemical abrasion to effectively improve the surface morphology of the scroll raceway and body for reducing the running vibration and *** the processing,nanocomposite materials not only have the mechanical grinding effect but also have the electrochemical *** the friction pair and the grinding reagent,there are energy exchange and mass *** the positive mechanical gradient’s metal protective film,the adsorbed deposit film and the chemical adsorbed surface film are formed on the friction surfaces,which can repair the friction pair’s wearing and corrosion,called the self-repairing effect on *** on analysis,we find this self-repairing is a kind of conditional *** friction pair’s relative motion and the reagent are the necessary conditions for self-repairing,and the nanocomposite materials have the significant effect on forming the self-repairing *** film not only can resist friction but also can compensate the wear *** the paper,we detailedly account the grinding mechanism,the characteristics and function of each grinding material,and the new method’s processing *** the difference from the bearing slices’ surface morphology between the fore and after grinding,we get the experimental findings:the roughness of the scroll surface Ra is decreased from 0.24592 μm to 0.17423 μm and Ry is decreased from 3.68 μm to 1.54 μm,which means the bearing’s surface morphology is effectively improved;Using the environmental scanning electron microscopy to observe the microscopic changes of the surface morphology,we pleasantly find the obviou

关键词： Surface Morphology Bearing nanocomposite material Grinding Reagent

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