聚乙二醇4000对硫酸钡微粒形貌的调控作用

以水溶性高聚物聚乙二醇4000（PEG4000）为分散剂，研究了反应方式、聚乙二醇浓度、钡离子与硫酸根物质的量比等因素对硫酸钡微粒形貌和晶体结构的影响，通过扫描电镜（SEM）、透射电镜（TEM）、X射线粉末衍射（XRD）等手段对合成样品的形貌和结构进行了表征。结果表明，反应体系经陈化和回流过程，均有利于硫酸钡微粒“溶解与再生长过程”的发生，易于得到较大尺寸的硫酸钡微粒；随着聚乙二醇浓度的增加，所得硫酸钡晶体的形貌呈现从十字花形经片状向棒状结构的显著变化，且在合适聚乙二醇浓度时可以得到具有良好光泽性能的片状硫酸钡单晶结构。钡离子与硫酸根物质的量比的改变也能影响硫酸钡微粒的形貌而得到新颖的“鱼骨刺”形的纳米结构。

Morphological control of BaSO4 particles by PEG4000

BaSO₄ crystal particles were synthesized by using water-soluble polyethylene glycol 4000（PEG4000） as dispersant.The effects of factors，such as reaction method，PEG4000 concentration，and amount-of-substance of Ba²⁺ to SO₄^2- etc.，on the morphology and crystal structure of the products were researched and characterized by the ways of scanning electron microscopy（SEM），transmission electron microscopy（TEM），and X-ray diffraction（XRD）.The results showed that both theaging and reflowing process were favorable for the ‘dissolution and regrowth process’ of BaSO₄ particles and for getting larger BaSO₄ particles；the morphology of BaSO₄ crystal changed from the  cross flower shape sheet to rod-shaped particles with the increasing of concentration of PEG4000 and when at the right concentration，sheet-like single crystal structure with good glossy performance could be obtained；And the change of the amount-of-substance ratio of Ba²⁺ to SO₄^2- could also affect the morphology of BaSO₄ particles to get a novel nanostructure of ‘fish bone spurs’ shape.