表面活性剂对YMn2O5粉体微观形貌的影响

Effects of Surfactants on Micromorphology of YMn2O5 Powder

通过加入不同表面活性剂,采用水热法制备出亚锰酸钇粉体。研究了表面活性剂的类型及加入量等因素对产物YMn2O5的影响,并利用X射线衍射仪(XRD)和场发射扫描电子显微镜(FESEM)对产物的物相及形貌进行表征。实验结果表明:十六烷基三甲基溴化铵(CTAB)与聚乙二醇(PEG)2000对于合成均一形貌的YMn2O5粉体具有积极作用;十二烷基硫酸钠(SDS)虽有利于棒状结构YMn2O5粉体的形成,但存在较多杂相;聚乙烯吡咯烷酮(PVP)则不利于YMn2O5粉体形成;此外,当PEG 2000加入量为0.1 mmol时,“菊花状”YMn2O5粉体生长机理为溶解-结晶-分化自组装机制。

Yttrium manganite powder was prepared by the hydrothermal method for adding different surfactants.The effects of the types and content of surfactants on YMn2O5 powder were studied.The phase and morphology of the products were characterized by XRD and FESEM.The results show that the cetyl trimethyl ammonium bromide(CTAB)and polyethylene glycol(PEG)2000 have a positive effect on the synthesis of YMn2O5 powder with uniform morphology.The YMn2O5 powder with rod structure is obtained by sodium dodecyl sulfate(SDS),which contains more impurity phases.Polyvinylpyrrolidone(PVP)is unbeneficial to the synthesis of YMn2O5 powder.At the amount of PEG 2000 is 0.1 mmol,the formation mechanism of chrysanthemum-like YMn2O5 powder is the dissolution-crystallization-differentiated self-assembly mechanism.