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Citation: Jin Shijiu, Gu Juying, Cheng Lin, Zhou Zukang. THE SURFACE CHARACTERISTICS OF γ-Fe₂O₃ POWDER[J]. Chinese Journal of Applied Chemistry, ;1986, 3(3): 30-34. shu

THE SURFACE CHARACTERISTICS OF γ-Fe₂O₃ POWDER

Jin Shijiu ¹ ,
Gu Juying ¹ ,
Cheng Lin ¹ ,
Zhou Zukang ^1,2

1.
1. Institute of Chemistry, Academia Sinica;
2.
2. Department of Chemistry, Beijing University

Received Date: 28 April 1985
Available Online: 4 September 1985

Dispersion of γ-Fe₂O₃ powder in polymer solution plays an important role in governing the recording density of magnetic recording materials. The wetting of the powders,disintegration of agglomerates and agglutination of particles are closely related to the surface characteristics of γ-Fe₂O₃ powder. In this paper, the wetting characteristics and the apparent contact angles of γ-Fe₂O₃ powder in polar and non-polar liquids were estimated by determining the penetration rates of these liquids through powders, as well as the sedimentative volume of powders in liquids. Based on Fowkes' theoretical assumption,the values of the surface tension of γ-Fe₂O₃ powder were calculated:γ_s^d=24 dyn/cm,γ_s^p=17dyn/cmand γ_s=41dyn/cm.
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