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Conflict of Interest: In relation to this article, we declare that there is no conflict of interest.

Publication history: Received December 12, 2013
Accepted April 16, 2014

This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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

Gyeong Sook Cho^{1 2} Dong-Hyun Lee¹ Hyung Mi Lim¹ Seung-Ho Lee¹ Chongyoup Kim² Dae Sung Kim^1†

¹Eco-Composite Materials Center, Korea Institute of Ceramic Engineering & Technology, Seoul 153-801, Korea ²Department of Chemical & Biological Engineering, Korea University, Seoul 136-701, Korea

dskim@kicet.re.kr

Korean Journal of Chemical Engineering, November 2014, 31(11), 2088-2093(6)
https://doi.org/10.1007/s11814-014-0112-5

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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.

Keywords

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

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