Zeta Potential of Iron Oxide Pigment Powder Using a Rotating Disk

作     者：Paulo Henrique Campos Prado Tavares Femando Soares Lameiras 

作者机构：Thematic Network on Materials Engineering (REDEMAT) Federal University of Ouro Preto (UFOP) Ouro Preto 35400-000 Brazil Development Center of Nuclear Technology (CDTN) National Nuclear Energy Commission (CNEN) Belo Horizonte 30161-970 Brazil 

出 版 物：《材料科学与工程（中英文B版）》 (Journal of Materials Science and Engineering B)

年 卷 期：2013年第3卷第1期

页      面：25-31页

学科分类：081704[工学-应用化学] 082903[工学-林产化学加工工程] 07[理学] 08[工学] 0817[工学-化学工程与技术] 0829[工学-林业工程] 082201[工学-制浆造纸工程] 0703[理学-化学] 070301[理学-无机化学] 0822[工学-轻工技术与工程] 

主　　题：Zeta电位 旋转盘 氧化铁 颜料分散体 zeta电位 X-射线衍射仪 料粉 X-射线荧光 

摘      要：The zeta potential measurement with a rotating disk (RDZP) is a technique originally developed for disk-shaped planar solid samples. In this work, the feasibility of using this technique for pigments powder was studied. The raw material of these pigments came from the desliming step of banded iron formation ore processing. This tailing contains mainly iron oxides (? 76 wt%) and particles with average size around 4 μm, which make it a potential pigment. Two different pigments were investigated. The as produced mud (brown hue) and that obtained after thermal treatment at 1,000 °C (red hue). Characterization tests were carried out by X-ray fluorescence (XRF), X-ray diffraction (XRD), thermogravimetric analysis (TG), differential thermal analysis (DTA), and laser granulometry. Color measurements of the pigments were performed using the CIELab system. The RDZP analyses of the pigments agree well with those reported in the literature using the traditional technique of mass transport by electrophoretic motility. The zeta potential measurements showed that the dispersion of the pigments in ammonium hydroxide solution with Ph = 14, ensuring absolute zeta potential values above 500 mV, is necessary to avoid pigment agglomeration when preparing styrene-acrylic paints.