Determination of the zeta potential of planar solids in nonpolar liquids

JOURNAL OF COLLOID AND INTERFACE SCIENCE

卷:592

Article

Prieve, Dennis C.^1,2  Yezer, Benjamin A.^1,2,3  Xu, Keyi^1,2,4  Khair, Aditya S.^1,2  Schneider, James W.^1,2  Sides, Paul J.^1,2 

[1] Carnegie Mellon Univ, Ctr Complex Fluids Engn, Pittsburgh, PA 15213 USA

[2] Carnegie Mellon Univ, Dept Chem Engn, Pittsburgh, PA 15213 USA

[3] Janssen Res & Dev LLC, LM Drug Prod Dev, Horsham, PA USA

[4] RJ Reynolds Tobacco, Winston Salem, NC USA

关键词: ZetaSpin;    Zeta potential;    Electrokinetic phenomena;    Streaming potential;    Nonpolar fluids;   

DOI  :  10.1016/j.jcis.2021.02.044

来源: Elsevier

【 摘 要 】

ZetaSpin determines zeta potential by measuring the streaming potential generated by rotating a disk-shaped sample about its axis while submerged in the liquid. The apparatus and procedure developed for ZetaSpin in aqueous solutions was adapted for use in highly nonpolar fluids like surfactant-doped alkanes. Perhaps most unexpected is the need for up to 10 min (instead of a fraction of one second for aqueous solutions) for the electrometer to display changes in streaming potential in response to changes in rotation speed. Four tests (suggested by theory) confirm that the potential finally reported by the elec-trometer was indeed the streaming potential. Compared to electrophoresis, ZetaSpin does not require a value for the Debye length, avoids the complication caused by the electric-field-dependence of elec-trophoretic mobility and can be used with planar samples as well as colloidal particles. (c) 2021 The Author(s). Published by Elsevier Inc. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).

【 授权许可】

Free