Study on Electric Properties of Particle/Fluid Suspension

颗粒/流体悬浮液电性能研究

• 批准号: 09450282
• 负责人: KONNO Mikio
• 金额: $ 10.24万
• 依托单位: Tohoku University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 1997
• 资助国家: 日本
• 起止时间: 1997 至 2000
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-09450282/
• 关键词: electrorheology; particle; aggregate structure; dielectrics; dielectric permittivity; electroconductivity; suspension; 機能性材料; エレクトロレオロジー効果; 粒子分散系流体; 誘電分極; 電気伝導率; 電気レオロジー流体; 粒子鎖構造; 伝導性電流; 変位電流; 電流特性

Materials of particles suspended in fluid are expected to change fluid properties and structures with an application of external electric and magnetic fields. Several properties of such fluid materials have been investigated experimentally and theoretically Electrorheological (ER) effects are typically observed in particle/insulating oil dispersions, whose shear stress can drastically increase with the external electric field applied. In the past, a number of mechanisms were proposed to explain such behavior. On the basis of the consideration of particle aggregation structures under the electric field, poor understanding of the mechanism makes it difficult to establish the grounding of material design of ER fluids. This project employed an ER fluid of silica particles or ferroelectric barium titanate particles suspended in electrically insulating silicone oil. In-situ measurements of dielectricity, electroconductivity and generated shear stress were performed under an application of alternative electric field. The generated shear stress was found to closely depend on the dielectric constant of the suspension. This finding has led to the derivation of a new correlation equation for the generated shear stress, the generated permittivity and the external electric field strength. It is verified that the equation can be applied for a wide variety of experimental conditions.

悬浮在流体中的颗粒材料在外加电场和磁场的作用下有望改变流体的性质和结构。这种流体材料的几种性质已经在实验上和理论上进行了研究，电流变（ER）效应通常在颗粒/绝缘油分散体中观察到，其剪切应力可以随着施加的外部电场而急剧增加。过去，人们提出了许多机制来解释这种行为。基于电场作用下颗粒聚集结构的考虑，对其机理的认识不足，使得电流变液材料设计的基础难以建立。该项目采用悬浮在电绝缘硅油中的二氧化硅颗粒或铁电钛酸钡颗粒的ER流体。在施加交流电场的情况下，对介电性、电导率和产生的剪应力进行了原位测量。所产生的剪切应力被发现密切依赖于悬浮液的介电常数。这一发现导致了一个新的相关方程的推导所产生的剪切应力，所产生的介电常数和外部电场强度。经验证，该方程可适用于各种各样的实验条件。

项目成果

Tomoaki Satoh: "Particle Size Distributions Produced by Hydrolysis and Condensation of Tetraethylorthosilicate" Journal of Chemical Engineering of Japan. 30・4. 759-762 (1997)

佐藤智明：“原硅酸四乙酯的水解和缩合产生的粒度分布”日本化学工程学报30・4（1997）。

Shuchao Gu: "Single Stage Polymerization of Micron-Size Polystylene Particles" Journal of Chemical Engineering of Japan. 30・4. 742-744 (1997)

顾树超：“微米级聚苯乙烯颗粒的一步聚合”日本化学工程学报30・4（1997）。

高野元峰, 今野幹男: "強誘電性チタン酸バリウム粒子分散系のエレクトロレオロジー効果と誘電特性の関係"日本レオロジー学会誌. 29. 15-19 (2001)

Motomine Takano、Mikio Konno：“铁电钛酸钡颗粒分散体系的电流变效应与介电性能的关系”日本流变学会杂志 29. 15-19 (2001)。

Shunchao Gu et al.: "Single Stage Polymerization Technique for Producing Monodisperse Micron-size Polymer Particles"Colloid and Surface A; Physiochemical and Engineering Aspects. 153. 209-213 (1999)

顾顺超等：“单阶段聚合技术生产单分散微米级聚合物颗粒”胶体和表面A；

Genho Takano and Mikio Konno: "In-situ Measurements of Electrorheological Response and Electric Properties of Ferroelectric Barium Titanate/Silicone Oil Suspension"日本レオロジー学会誌. (印刷中).

Genho Takano 和 Mikio Konno：“铁电钛酸钡/硅油悬浮液的电流变响应和电性能的现场测量”日本流变学会杂志（正在出版）。