Article ID Journal Published Year Pages File Type
10666518 Materials Letters 2005 5 Pages PDF
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).
Related Topics
Physical Sciences and Engineering Materials Science Nanotechnology
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