(7月16日10:00)Electrophoresis of Metal Oxide Nanoparticles: Theory and Experiment
报告题目:
Electrophoresis of Metal Oxide Nanoparticles: Theory and Experiment
报告人: Professor Jyh-Ping Hsu (徐治平 教授)
Department of Chemical Engineering,
National Taiwan University
时间:2014年7月16日(周三) 10:00
地点:中国科学院力学研究所主楼344会议室
报告摘要:
An electrophoresis model taking account of the pH-regulated nature of particles and the presence of multiple ionic species is proposed for arbitrary surface potential and double layer thickness. It successfully simulated the electrophoretic behavior of Fe3O4 nanoparticles in an aqueous NaCl solution with pH adjusted by HCl and NaOH. The estimated zeta potential is compared with those from the conventional models, Smoluchowski’s, Hückel’s, and Henry’s formulas. Due to the violation of the assumption of low and constant surface potential, these formulas yielded appreciable deviations (e.g., 23-30 mV at pH 9). With the surface charge density measured by titration and the zeta potential by electrophoresis, the true surface potential is estimated through a triple-layer model. The estimated surface potential is typically 1.5-10 times higher than the experimental zeta potential, implying that using the latter in relevant calculations (e.g., electric energy between two particles) may underestimate appreciably the correspondingtrue values.
报告人简介: