title: A novel method for measuring zeta potentials of solid-liquid interfaces.
abstract: A novel method for measuring the zeta potential of PDMS-electrolyte solution interface is presented in this paper. When an electrolyte solution passes the electrode coated with PDMS film, an electrical current will be induced due to the electrostatic potential difference between the PDMS-air interface and the PDMS-electrolyte solution interface. Based on this principle, the relationship between the measured electrical signal and the zeta potential of PDMS-electrolyte solution interface is experimentally investigated. The results show that the magnitude of the measured signal is linearly proportional to this potential difference. An empirical correlation between the zeta potential and the measured voltage signal was obtained. Good agreement was found when comparing the zeta potential calculated by this empirical equation with that reported in the published journal papers. The zeta potential measurement method presented in this paper is simple and accurate and can be used for measuring zeta potentials of other dielectric-electrolyte interfaces.
authors.affiliation: Department of Marine Engineering, Dalian Maritime University, Dalian 116026, China.
authors.forename: Yongxin
authors.initials: Y
authors.lastname: Song
authors.affiliation: Department of Marine Engineering, Dalian Maritime University, Dalian 116026, China.
authors.forename: Kai
authors.initials: K
authors.lastname: Zhao
authors.affiliation: Department of Marine Engineering, Dalian Maritime University, Dalian 116026, China.
authors.forename: Mengqi
authors.initials: M
authors.lastname: Li
authors.affiliation: Department of Marine Engineering, Dalian Maritime University, Dalian 116026, China.
authors.forename: Xinxiang
authors.initials: X
authors.lastname: Pan
authors.affiliation: Department of Mechanical and Mechatronics Engineering, University of Waterloo, Waterloo, ON N2L 3G1, Canada. Electronic address: dongqing@uwaterloo.ca.
authors.forename: Dongqing
authors.initials: D
authors.lastname: Li
keywords: Induced current; PDMS–electrolyte solution interface; Potential difference; Zeta potential measurement