교반 속도와 분산제 농도가 세리아 현탁액의 분산효과에 미치는 영향

초록

The effects of stirring speed and dispersant concentration on the suspension and redispersion of ceria (CeO2) polishing liquid was investigated. Sedimentation behavior of ceria was evaluated for up to 14 days, and dispersion with varying dispersant concentrations were prepared to analyze the size and distribution of nanoparticles. It was observed that an excessive concentration of dispersant led to secondary aggregation of ceria nanoparticles, while an insufficient concentration resulted in decreased dispersing power. Among the three dispersants tested, PVP exhibited the best performance, effectively dispersing cerium nanoparticle powder to an average size of 82.1 nm, thus providing superior dispersion effect and stability. Furthermore, optimal dispersion was achieved at a stirring speed of 4000 rpm and a pH of 3 in the absence of a dispersant.

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