Interfacial Properties of <TEX>$gamma-Alumina/KCI^{(ag)}$</TEX> Electrical Double Layer

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J. Korean Ceram. Soc. > Volume 31(6); 1994 > Article

Journal of the Korean Ceramic Society 1994;31(6): 678.

$gamma$-알루미나/KCl 수용액의 전기 이중층에서 계면 물성

홍영호, 함영민, 장윤호¹

단국대학교 공과대학 화학공학과
¹인하대학교 공과대학 화학공학과

Interfacial Properties of $gamma-Alumina/KCI^{(ag)}$ Electrical Double Layer

ABSTRACT

The surface of alumina is capable of acquiring a change when it is in an aqueous solution. This surface change will have a strong influence on the surrounding ions, particularly those of opposite change known as the counter ions. A site-binding model of the {{{{ gamma }}-alumina/KCl(aq) interface was used to calculated theoretical surface ionization constants and P.Z.C.(Point of zero change) of {{{{ gamma }}-alumina. This paper was carried out to investigate the effect of calcination temperature on the acidic and electrical properties of pure {{{{ gamma }}-alumina prepared by the precipitation method from the Al(NO3)3.9H2O and NH4OH. From the experimental data it was shown that {{{{ gamma }}-alumina have a mainly Br nsted acid site. However, the acidity of {{{{ gamma }}-alumina decreased with increasing calcination temperature at strength Ho +9.3. The surface charge density of {{{{ gamma }}-alumina was increased with electrolyte ionic strength and calcination temperature.