Surface-modification of fine red iron oxide pigment--颗粒学报PARTICUOLOGY

Zheng, S., & Zhang, Q. (2003). Surface-modification of fine red iron oxide pigment. China Particuology, 1(4), 176-180. https://doi.org/10.1016/S1672-2515(07)60137-7

Surface-modification of fine red iron oxide pigment

Shuilin Zheng ^a *, Qinghui Zhang ^b

a China University of Mining Technology, Beijing 100083, P. R. China
b University of Science and Technology of Beijing, Beijing 100083, P. R. China

10.1016/S1672-2515(07)60137-7

Volume 1, Issue 4, September 2003, Pages 176-180

Received 1 April 2003, Accepted 27 June 2003, Available online 27 November 2007.

E-mail: shuilinzh@sina.com

Highlights

Abstract

Surface-modification of fine red iron oxide pigment was carried out in an aqueous solution of sodium polyacrylate. The sedimentation time of modified samples in water increased from 1.05 to 264.4 hours while the particle size (d₅₀) decreased from 1.09 to 0.85 μm, and the tinting strength increased from 100 to 115. The surface-modification as well as the dispersing and stabilizing mechanisms in aqueous solution of the samples were studied by means of IR, Thermal analysis and Zeta potential. The results showed that the modifier molecules acted on the surface of the particles by chemical and physical adsorption, and after the particles were dispersed in aqueous solution, endowing the particle surface with a relatively high negative Zeta potential, thus enhancing electrostatic and steric repulsion between particles for their effective stabilization.

Graphical abstract

Keywords

red iron oxide; surface modification; adsorption

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