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http://dx.doi.org/10.9713/kcer.2013.51.5.622

Effect of Concentration and Surface Property of Silica Sol on the Determination of Particle Size and Electrophoretic Mobility by Light Scattering Method  

Cho, Gyeong Sook (Eco-Composite Materials Center, Energy Environment Materials Division, Korea Institute of Ceramic Engineering & Technology (KICET))
Lee, Dong-Hyun (Eco-Composite Materials Center, Energy Environment Materials Division, Korea Institute of Ceramic Engineering & Technology (KICET))
Kim, Dae Sung (Eco-Composite Materials Center, Energy Environment Materials Division, Korea Institute of Ceramic Engineering & Technology (KICET))
Lim, Hyung Mi (Eco-Composite Materials Center, Energy Environment Materials Division, Korea Institute of Ceramic Engineering & Technology (KICET))
Kim, Chong Youp (Department of Chemical & Biological Engineering, Korea University)
Lee, Seung-Ho (Eco-Composite Materials Center, Energy Environment Materials Division, Korea Institute of Ceramic Engineering & Technology (KICET))
Publication Information
Korean Chemical Engineering Research / v.51, no.5, 2013 , pp. 622-627 More about this Journal
Abstract
Colloidal silica is used in various industrial products such as chemical mechanical polishing slurry for planarization of silicon and sapphire wafer, organic-inorganic hybrid coatings, binder of investment casting, etc. An accurate determination of particle size and dispersion stability of silica sol is demanded because it has a strong influence on surface of wafer, film of coatings or bulks having mechanical, chemical and optical properties. The study herein is discussed on the effect of measurement results of average particle size, sol viscosity and electrophoretic mobility of particle according to the volume fraction of eight types of silica sol with different size and surface properties of silica particles which are presented by the manufacturer. The measured particle size and the mobility of these sol were changed by volume fraction or particle size due to highly active surface of silica particle and change of concentration of counter ion by dilution of silica sol. While in case the measured sizes of small particles less than 60 nm are increased with increasing volume fraction, the measured sizes of larger particles than 60 nm are slightly decreased. The mobility of small particle such as 12 nm are decreased with increase of viscosity. However, the mobility of 100 nm particles under 0.048 volume fraction are increased with increasing volume fraction and then decreased over higher volume fraction.
Keywords
Silica Sol; DLS; Particle Size; Electrophoresis; Particle Mobility; Volume Fraction;
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