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교반 속도와 분산제 농도가 세리아 분산액의 분산효과에 미치는 영향

Influence of Stirring speed and Concentration on the Dispersibility and Stability of Ceria Suspensions

Sung Woo Han1 Jae Hoon Yeo1 Si Eun Kim1 Xuelong Zhuang1 박정훈1†
1Dongguk University Chemical and Biochemical Engineering, 1동국대학교 화공생물공학과
In Press, Journal Pre-proof, Available online 1 February 2025

Abstract

교반 속도와 분산제 농도가 세리아(CeO2) 연마액의 현탁 정도 및 재분산에 미치는 영향을 조사하고, 일정 시간 방치하여 세리아의 침강 거동을 확인하였으며, 분산제 농도를 달리한 분산액을 제조하여 나노입자 크기 및 침전도를 분석하였다. 분산제의 농도가 과도하게 첨가되면 세리아 나노입자가 2차 응집되고 부족하면 분산력이 감소한다는 것이 밝혀졌다. 세 가지 분산제 중 가장 우수한 성능을 보인 분산제 PVP는 세륨 나노입자 분말을 82.1 nm로 분산시킬 수 있었으며 분산 효과 및 분산 안정성이 가장 뛰어났다. 또한, 분산제를 첨가하지 않고 교반 속도에 변화를 주어 관찰하였을 때 4000 rpm, pH 3에서 최적의 분산 효과를 얻을 수 있다.
The effect of stirring speed and dispersant concentration on the suspension and redispersion of ceria (CeO2) polishing liquid was investigated. Sedimentation behavior of ceria was evaluated over a specified period, and dispersions 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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