In this work, we demonstrate a new, facile approach for preparation of monodispersed, submicrometer silica particles via a tetrabutylammonium bromide (TBABr) assisted Stöber method. Sizes of the resulting silica particles increased from 0.39 to 1.08 μm with polydispersity lower than 5 % while the concentration of TBABr in the reaction media was elevated from 0 to 20.0 mM. The presence of TBABr molecules was able to effectively suppress the condensation rate of silanol monomers during the Stöber reaction, which, in turn, slowed the formation of silica seeds and thus accounted for growth of large silica particles. The use of tetraethylammonium bromide (TOABr), a quaternary ammonium agent with longer alkyl chains, instead of TBABr, yielded monodisperse silica particles more hydrophobic in character, making it feasible to tailor the surface properties of the as-prepared silica particles.

在这项工作中，我们演示了一种新的简便方法，该方法可通过四丁基溴化铵（TBABr）辅助的Stöber方法制备单分散的亚微米级二氧化硅颗粒。所得二氧化硅颗粒的尺寸从0.39μm增加到1.08μm，多分散度低于5％，而反应介质中TBABr的浓度从0增加到20.0 mM。TBABr分子的存在能够有效地抑制在Stöber反应过程中硅烷醇单体的缩合速率，从而减慢了二氧化硅种子的形成，从而解释了大二氧化硅颗粒的生长。使用具有更长烷基链的季铵试剂四乙基溴化铵（TOABr）代替TBABr，可得到特性更疏水的单分散二氧化硅颗粒，