Characterization of surface charge and zeta potential of colloidal silica prepared by various methods

Gyeong Sook Cho, Dong Hyun Lee, Hyung Mi Lim, Seung Ho Lee, Chongyoup Kim, Dae Sung Kim

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Colloidal silica is prepared by hydrolysis of TEOS, direct oxidation of Si powder, condensation of silicic acid, etc. There are differences in surface reactivity of silica particle due to the preparation routes. Therefore, it is useful to evaluate surface properties accurately in order to understand the physiochemical properties of the products. The surface charge density, site density and zeta potential with respect to three types of colloidal silica were estimated and discussed. The surface charge density was different depending on preparation method. It is decreasing in the order of direct oxidation, ion exchange, TEOS hydrolysis. The zeta potential is decreasing in the order of ion exchange, TEOS hydrolysis, direct oxidation. The order in surface charge density is different from that in zeta potential because of the difference in stability depending on the particle size and surface charge density.

Original languageEnglish
Pages (from-to)2088-2093
Number of pages6
JournalKorean Journal of Chemical Engineering
Volume31
Issue number11
DOIs
Publication statusPublished - 2014

Keywords

  • Colloidal Silica
  • Surface Charge Density
  • Surface Property
  • Surface Site Density
  • Zeta Potential

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)

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