New zeta-potential measurement appratus capable to estimate dependancy of particle size and develop particle classification

2014 Fiscal Year Final Research Report

• Project/Area Number: 24560922
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Properties in chemical engineering process/Transfer operation/Unit operation
• Research Institution: Hiroshima University
• Principal Investigator: HIDETO Yoshida 広島大学, 工学(系)研究科(研究院), 教授 (30116694)
• Co-Investigator(Kenkyū-buntansha): FUKUI Kunihiro 広島大学, 大学院工学研究科, 教授 (60284163) ; YAMAMOTO Tetsuya 名古屋大学, 大学院工学研究科, 准教授 (10432684)
• Project Period (FY): 2012-04-01 – 2015-03-31
• Keywords: 湿式分級 / 電気泳動 / 沈降法

Outline of Final Research Achievements

In order to know particle charge level in liquid state, zeta-potential measurement is usually used in practical process. Howeve, conventional apparatus is difficult to know the dependancy of zeta-potential change with particle diameter. This research presents new measurement method which is based on sedimentation balance method. The absolute valu of zeta-potential shows the maximum value after particle dispersion process, but the value decreases with time and finally shows a contant value. For submicrin silica particles, zeta-potential changes with particle diameter.
New particle classification appratus of continuous vertical type separator is also developed and high particle separation performance was obtained.

Free Research Field

化学工学　粉体工学