Electrophoresis of pH-regulated particles in the presence of multiple ionic species

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

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Author(s)

Detail(s)

Original languageEnglish
Pages (from-to)451-458
Journal / PublicationAICHE Journal
Volume60
Issue number2
Publication statusPublished - Feb 2014
Externally publishedYes

Abstract

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 true potential is typically 1.5-10 times larger than the zeta potential, implying that using the latter in relevant calculations (e.g., stability and critical coagulation concentration) might yield appreciable deviation. © 2013 American Institute of Chemical Engineers.

Research Area(s)

  • Electrophoresis, Multiple ionic species, PH-regulated particle, Triple-layer model

Bibliographic Note

Publication details (e.g. title, author(s), publication statuses and dates) are captured on an “AS IS” and “AS AVAILABLE” basis at the time of record harvesting from the data source. Suggestions for further amendments or supplementary information can be sent to lbscholars@cityu.edu.hk.

Citation Format(s)

Electrophoresis of pH-regulated particles in the presence of multiple ionic species. / Hsu, Chien; Lee, Duu-Jong; Hsu, Jyh-Ping et al.
In: AICHE Journal, Vol. 60, No. 2, 02.2014, p. 451-458.

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review