Nishimura Satoshi, Matsumura Hideo, Kosuge Katsunori, Yamaguchi Tomohiko
Nanotechnology Research Institute, National Institute of Advanced Industrial Science & Technology, Tsukuba, Ibaraki, Japan. s.nishimura@ aist.go.jp
Langmuir. 2007 Jun 5;23(12):6567-75. doi: 10.1021/la0615488. Epub 2007 May 5.
The alignments of silica particles formed in sinusoidal electrical fields of 1 kHz were assessed using an optical microscope with measuring the electric conductance of a silica dispersion between two Pt electrodes in a vitreous silica glass cell. We confirmed that the electric conductance of the silica dispersion between the two electrodes in the cell reflected the surface conductance of the silica particles settling at the bottom of the cell. More interestingly, we observed that the electric conductance of the silica dispersion in the cell increased when pearl chains of the silica particle were formed along the direction of the electric field. However, no clear change in the electric conductance of the dispersion was observed at higher electric field strengths where a transition from pearl chains to zigzag band patterns and circulating movements of the silica particles in the zigzag bands formed.
使用光学显微镜，通过测量玻璃石英玻璃池中两个铂电极之间二氧化硅分散体的电导，评估了在1kHz正弦电场中形成的二氧化硅颗粒的排列情况。我们证实，池中两个电极之间二氧化硅分散体的电导反映了沉降在池底部的二氧化硅颗粒的表面电导。更有趣的是，我们观察到，当二氧化硅颗粒的珍珠链沿电场方向形成时，池中二氧化硅分散体的电导增加。然而，在较高电场强度下，未观察到分散体电导的明显变化，此时形成了从珍珠链到之字形带图案的转变以及二氧化硅颗粒在之字形带中的循环运动。
