Classification of Particles Dispersed by Bead Milling with Electrophoresis
Classification of Particles Dispersed by Bead Milling with Electrophoresis
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DOI：
10.14356/kona.2011015
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发表时间：
2011
影响因子：
4.1
通讯作者：
Tetsuya Yamamoto;Y. Harada;Takayuki Tsuyama;K. Fukui;Hideto Yoshida
中科院分区：
文献类型：
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作者：
Tetsuya Yamamoto;Y. Harada;Takayuki Tsuyama;K. Fukui;Hideto Yoshida
本研究的目的是开发一种新的颗粒分级技术和设备，以取代离心分离法，其中由于粗颗粒在分离器壁上的沉积而不可能连续操作分级。在我们最近的研究中，很明显，通过珠磨机分散的二氧化硅颗粒的zeta电位具有尺寸依赖性。因此，在较小颗粒的ζ电位比较大颗粒的ζ电位更负的条件下，使用电场流分级（ELECTRICAL FLOW Fractionation，简称EFF）系统对颗粒进行分类。以往的BMF装置采用水平场流，而本研究设计的装置采用垂直场流和圆柱形通道，长度为350 mm，半径为6 mm，以减少运行成本和操作时间的颗粒分类。关于该装置的分级性能，发现使用低的施加电压对尺寸为50 nm至400 nm的二氧化硅颗粒进行分级。该方法防止颗粒沉积在设备壁上，并允许连续操作。理论计算的结果定性地支持了本研究中得到的实验结果。
The purpose of the present study is to develop a new particle classification technique and apparatus to replace centrifugal separation method, where continuous operation for classification is impossible because of the deposition of the coarse particles on the wall of the separator. In our recent research, it was clear that the zeta potential of the silica particles dispersed by a bead mill had size dependency. Hence, the particles were classified using an electrical field flow fractionation (EFFF) system under the condition that the zeta potential of the smaller particles was more negative than that of larger particles. Previous EFFF apparatus utilized horizontal field flow; however, the apparatus designed in this study had vertical field flow and cylindrical channel with length of 350 mm and radius width of 6 mm to reduce the running cost and operation time for classification of particles. About the classification performance of this apparatus, it was found that the silica particles with the size from 50 nm to 400 nm were classified using a low applied voltage. This method prevented deposition of particles on the wall of the apparatus and allowed continuous operation. Results of theoretical calculations supported qualitatively the experimental results obtained in this research.