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균일침전법에 의한 산화아연 미세 입자의 생성
The Preparation of Zinc Oxide Fine particles by Homogeneous Precipitation Method
HWAHAK KONGHAK, August 1995, 33(4), 437-444(8), NONE
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Abstract
Hexamethylenetetramine(HMTA) 존재 하에서 질산아연 수용액으로부터 균일침전법으로 산화아연 미세입자를 제조하였다. 전화율 증가속도와 평형전화율 R 값과 반응온도가 증가할수록, 용액의 초기 pH가 감소할수록 증가했으나, 아연의 초기 농도에는 거의 영향을 받지 않았다. 질산아연과 HMTA의 농도, 반응온도, 반응액의 초기 pH 그리고 반응시간과 같은 침전조건에 따라 여러 형태의 산화아연 입자들이 얻어졌따. 초기의 미세 결정입자는 평균 직경이 대략 1㎛ 전후이고 구형에 가깝지만, 성장하면서 서로 결합하여 embryonic particle을 형성한 후 성장해 갔다. 아연의 초기농도와 R값이 모두 높을 때 비교적 입도분포가 좁은 구형 입자들이 생성되었다.
Zinc oxide fine particles were prepared from aqueous solutions of zinc nitrate in the presence of hexamethylenetetramine by homogeneous precipitation method. The rate of conversion change and the equilibrium conversion of zinc increased with the increase in R values and temperature, and with the decrease in initial pH of the solutions but initial concentration of zinc had only minor effect on them. Various shapes of zinc oxide fine particles were formed in relation to the precipitation conditions such as, concentrations of zinc nitrate and hexamethylenetetramine, temperature, pH of initial solution and aging time. The initial microcrystalline particles are approximately spherical with an average size of 1㎛, but they formed embryonic particles by coupling together and grew up. Spherical particles with a relatively narrow size distribution could be obtained when the concentration of zinc ion and R value were both high.
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