钛酸钡-明胶复合含水弹性胶体电控力学行为
MECHANICAL BEHAVIOR OF ELASTIC COMPOSITE GEL UNDER DC ELECTRIC FIELD
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摘要: 将无机钛酸钡颗粒分散到含水明胶体系中,在有、无电场作用下分别胶凝得到了两种类型的复合弹性水凝胶。通过对胶体的内部颗粒分散情况分析和压缩模量的测试,研究了该胶体体系对电场的响应。结果表明,两种类型的弹性水凝胶分散相颗粒的分布有明显不同,对电场的响应程度也有很大差异。分析认为,电场作用使颗粒有序分布于连续相的胶联网络中,并形成链状结构。颗粒的有序分布使胶体的压缩模量增强,对电场作用的响应程度增大,在钛酸钡质量分数为1.5% 时胶体压缩模量出现一个极大值,并对电场响应最强。Abstract: Two types of gel were made using Barium Titanate particles dispersed in gelatin containing water in the absence/presence of the applied DC electric field. The microstructures of the particles in the two types of gel were observed by a microscopical method. The compression moduli of the gels were measured as a function of weight percent Barium Titanate in the gels and applied electric field strength for curing and measuring. Consequently, it is shown that the particles were aligned in the gel by the applied DC electric field, the compression modulus of the gel could be increased by pre-aligning the particles in the gel and the applied DC electric field for curing and measuring, and the response to the applied electric field could be increased by the aligned particles. The mechanical behavior of the gels can be controlled by the electric field strength.