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A review of recent progress in preparation of hollow polymer microspheres

Petroleum Science 2009年第3期6卷 306-312页

作者： Wei Bin Wang Shujun Song Hongguang Liu Hongyan Li Jie Liu Ning State Key Laboratory of Heavy Oil Processing China University of Petroleum Beijing 102249 China Henan Shenma Nylon Chemical Co. Ltd Pingdingshan Henan 467013 China School of Chemical Science and Engineering China University of Petroleum Beijing 102249 China

The preparation methods of hollow polymer microspheres both at home and abroad are summarized, and their preparation mechanisms and developmental states are presented. These methods include the liquid droplet method, dried-gel droplet method, self-assembly method, microencapsulation method, emulsion polymerization method and the template method. Hollow polystyrene microspheres are the most extensively studied in the research of hollow polymer microspheres. Through comparison of the advantages and disadvantages of different preparation methods, it is concluded that microencapsulation method is most suitable for preparing polystyrene hollow microspheres.

关键词： preparation methods hollow polymer microspheres preparation mechanism polystyrene hollow microspheres microencapsulation method

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Recent progress in porous intermetallics:Synthesis mechanism,pore structure,and material properties

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Journal of Materials Science & Technology 2021年第15期74卷 89-104页

作者： Yao Jiang Yuehui He Haiyan Gao State Key Laboratory of Powder Metallurgy Central South UniversityChangsha410083China

Intermetallic compounds have the characteristics of long-range ordered structure and combination of metallic and covalent bonds,showing intrinsic brittleness and outstanding performance *** synthesis mechanism,pore structure characterization and material properties of powder metallurgy porous intermetallics are reviewed in this *** with traditional porous materials,porous intermetallics have good thermal impact resistance,machinability,thermal and electrical conductivity similar to metals,as well as good chemical corrosion resistance,rigidity and high-temperature property similar to *** mechanisms of preparation and pore formation of porous intermetallics mainly include four aspects:(1)the physical process based on the interstitial space between the initial particles and its evolution in the subsequent procedures;(2)the chemical combustion process based on the violent reaction between the initial powder components;(3)the reaction kinetics process based on the difference between the diffusion rates of elements;(4)the phase transition process based on the difference between the phase *** characterization parameters to the pore structure description for porous intermetallics include mainly overall porosity,open porosity,permeability,maximum pore size,pore size distribution and tortuosity *** terms of microstructure characterization of porous intermetallics,three-dimensional pore morphology scanning technology has the potential to reveal the internal characteristics of pore *** research on material properties of porous intermetallics mainly focuses on electrochemical catalytic activity,generalized oxidation resistivity at high temperature,resistance against chemical corrosion and mechanical properties,which have obvious advantages over traditional porous *** the field of the development of porous intermetallics,it is expected to expand their applications by further reducing the pore size to the nanoscale

关键词： Intermetallic compound Porous material preparation mechanism Pore structure Material property

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维普期刊数据库

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体育融入卫生健康治理的战略定位、现实困境及推进机制

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体育 2023年第11期

作者：杨继星陈家起高奎亭闫士展

体育融入卫生健康治理旨在依托整体性治理原则，通过体育与卫生系统间理念交融、多种形式协作、异质资源共享、技术结合等方式，实现卫生健康治理领域内体育健康治理的理念、机构、人员、技术及服务准入，形成完善慢性非传染性疾病防控... 详细信息

体育融入卫生健康治理旨在依托整体性治理原则，通过体育与卫生系统间理念交融、多种形式协作、异质资源共享、技术结合等方式，实现卫生健康治理领域内体育健康治理的理念、机构、人员、技术及服务准入，形成完善慢性非传染性疾病防控体系、辅助突发公共卫生事件应急、优化妇幼保健方案、赋能健康老龄化、助力环境卫生整治以及支援健康贫困治理等战略定位。然而，受制于体育融入卫生健康治理的法制保障滞后、部门间关系薄弱、人才储备欠缺、技术标准有待明确、制度供给不足等困境，亟待借助印象机制(建立体育融入卫生健康治理的“符号”)、互信机制(强化体育与卫生部门的协作治理关系)、筹备机制(建设人才队伍、确立技术标准)、运作机制(建立融入治理的相关制度)、维护机制(以“激励—监督”支撑可持续治理)，实现体育融入卫生健康的长效治理。

关键词：卫生健康治理体卫融合体医融合印象机制互信机制筹备机制运作机制维护机制 health governance integration of sport and health integration of sport and medicine impression mechanism mutual trust mechanism preparation mechanism operation mechanism maintenance mechanism

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