反应条件对乳液法自组装合成氧化锰纳米粒子结构、形貌和尺寸的影响

通过改变反应物物质的量比、分散相与连续相体积比、反应体系温度和煅烧后处理温度,研究了反应条件对乳液法自组装合成氧化锰纳米粒子结构、形貌和尺寸的影响.结果表明:当高锰酸钾与油酸物质的量比在1∶5～1∶1之间时,形成蜂窝状纳米粒子和空心纳米粒子;当分散相(油酸)与连续相(水)的体积比为4∶200时,形成良好的空心球纳米结构;反应体系温度升高不利于产物的洗涤;不同温度的煅烧后处理不仅影响氧化锰纳米粒子的形貌,而且影响其结晶度和晶型.

Effects of Reaction Conditions on the Structure,Morphology and Size of Manganese Oxide Nanoparticles

Effects of reaction conditions on the structure, morphology and size of manganese oxide nanoparticles were studied by changing the reactant molar ratio, the volume ratio of dispersed phase/continuous phase, the reaction temperature and the post-calcination temperature in their emulsion self-assembly synthesis. The results showed that honeycomb and hollow nanoparticles were obtained in the KMnO₄/oleic acid molar ratio range of 1∶5～1∶1. When the volume ratio of dispersed phase (oleic acid)/continuous phase (water) was 4∶200, spherical hollow nanospheres were produced. The increase of reaction temperature was unfavorable to the rinsing of product. Post-calcination at varied temperatures not only influenced the product morphology, but their crystalinity and crystal structure as well.