Dielectric Criteria for the Electrorheological Effect

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• 作者：Tian Hao ; Akiko Kawai ; and Fumikazu Ikazaki
• 刊名：Langmuir
• 出版年：1999
• 出版时间：February 16, 1999
• 年：1999
• 卷：15
• 期：4
• 页码：918 - 921
• 全文大小：69K
• 年卷期：v.15,no.4(February 16, 1999)
• ISSN：1520-5827

文摘

The suspended particles of an electrorheological (ER) fluid can be easily arrayed as a crystallite of abody-centered tetragonal (bct) lattice structure using an external electric field. Thus the entropy of thisprocess, which is generally recognized as a first-order phase transition, would greatly decrease. From thisfact, we theoretically derive that the dielectric loss tangent maximum value of the dispersed particlesshould be larger than 0.1, which agrees well with the currently observed experimental results; the negativeER effect becomes possible only when d_sp/dT < 0, where _sp is the static dielectric constant of the dispersedparticle material and T is temperature.