Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
10666518 | Materials Letters | 2005 | 5 Pages |
Abstract
A new double-hydrophilic copolymer, poly(ethylene glycol) acrylate-copoly(methacrylic acid), is synthesized and used to control the morphology of barium hydrogen phosphate, which gives different shapes at different pH values: hexagon (pH=7.26), sphere cluster (pH=8), sphere with rough surface (pH=9), sphere with relatively smooth surface (pH=10), and small sphere (pH=11). The order of the particles increases with the pH value increases. The products vary from the out-of-order particles obtained at low pH to the uniform spherical particles at high pH. The results of X-ray diffraction (XRD) indicate that the structures of the particles controlled by copolymers are mainly BaHPO4 when pH<11. Weak diffraction peaks of Ba5(PO4)3OH (112) and (211) appear when pH=11, which means that precipitates are also mainly BaHPO4 but with minor Ba5(PO4)3OH. The results can be explained by the results of calculating distribution coefficients of ions (δ).
Keywords
Related Topics
Physical Sciences and Engineering
Materials Science
Nanotechnology
Authors
Fang Wang, Gui-Ying Xu, Zhi-Qing Zhang,