Electrorheological response of swollen silicone gels containing barium titanate
Electrorheological response of swollen silicone gels containing barium titanate
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DOI：
10.1016/j.polymer.2004.03.056
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发表时间：
2004-05
期刊：
影响因子：
4.6
通讯作者：
T. Mitsumata;K. Sugitani;K. Koyama
中科院分区：
文献类型：
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作者：
T. Mitsumata;K. Sugitani;K. Koyama
我们研究了含钛酸钡的硅凝胶在直流电场作用下的储能模量。硅油溶胀的钛酸钡凝胶的储能模量降低，即负电流变效应。相反，在未溶胀的凝胶和不含钛酸钡的硅凝胶中没有观察到负电流变效应。Swedish硅凝胶和大多数硅/BaTiO 3凝胶在电场强度上服从经验二次依赖关系。虽然在溶胀的凝胶中没有观察到明显的相分离，但由于颗粒（10 - 10 S/cm）和硅油（10 - 9 S/cm）之间的电导率差异，可能发生微观相分离，结果出现负电流变效应。讨论了频率、溶胀度和电场强度的影响。
We have investigated storage moduli of silicone gels containing barium titanate in the presence of dc electric fields. The gels containing barium titanate swollen by silicone oil showed a storage modulus reduction, i.e. negative electrorheological effect. Contrary, no negative electrorheological effect was observed in the unswollen gels and silicon gels without barium titanate. Swollen silicone gels and most of silicone/BaTiO3gels obeyed empirical quadratic dependence in electric field strength. Although an apparent phase separation was not observed in the swollen gel, microscopic phase separation may occur due to the difference in electric conductivity between particles (∼10−10S/cm) and silicone oil (10−9S/cm), as a result, the negative electrorheological effect appears. The effects of frequency, degree of swelling, and the field strength have been discussed.