Fabrication of composite particles by attaching surface-modified nanoparticles to core particles by wet processing in organic solvents
Fabrication of composite particles by attaching surface-modified nanoparticles to core particles by wet processing in organic solvents
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DOI：
10.1016/j.colsurfa.2014.03.101
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发表时间：
2014-06
期刊：
影响因子：
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通讯作者：
M. Iijima;K. Oguma;Aki Kurumiya;H. Kamiya
中科院分区：
文献类型：
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作者：
M. Iijima;K. Oguma;Aki Kurumiya;H. Kamiya
开发了一种简单的湿法工艺路线，通过将高度分散的纳米颗粒吸附在有机溶剂中的核心颗粒上，而不会形成强聚集体。该过程包括一个简单的混合过程，使用核心颗粒和表面修饰的高分散纳米颗粒（壳纳米颗粒）在有机溶剂中，通过超声波辅助。作为模型研究，采用Stöber工艺制备的亚微米级（约400 nm）和纳米级（约30 nm） sio2颗粒分别作为芯材和壳材。通过吸附阳离子聚乙烯亚胺和包含支链烷基和聚乙二醇链的阴离子表面活性剂，以提高在各种有机溶剂中的稳定性，并控制与核心材料的相互作用，对壳型sio2纳米颗粒的表面进行了一层一层的修饰。结果表明，表面修饰的壳型sio2纳米颗粒在甲苯中吸附效果较好，而在乙醇中吸附效果较差。合成的复合颗粒在甲苯中表现出比原始sio2颗粒更好的稳定性。在原子力显微镜胶体探针法表面相互作用测量的基础上，提出了壳型sio2纳米颗粒在各种有机溶剂中对核心颗粒的吸附机理。我们认为，壳层sio2纳米颗粒与核心颗粒之间的远程粘附力对促进有效吸附起着重要作用，从而形成复合颗粒。
A simple wet processing route for the formation of composite particles via the adsorption of highly dispersible nanoparticles onto the core particles in organic solvents, without the formation of strong aggregates, was developed. The process involved a simple mixing procedure using core particles and surface-modified highly dispersible nanoparticles (shell nanoparticles) in organic solvents, assisted by ultrasonication. As a model study, submicron-sized (ca. 400 nm) and nano-sized (ca. 30 nm) SiO2particles, prepared by Stöber process, were applied as the core and shell materials, respectively. The surface of the shell SiO2nanoparticles was modified by a layer-by-layer process that involves the adsorption of cationic polyethyleneimine and an anionic surfactant comprising branched alkyl and polyethylene glycol chains for improving the stability in various organic solvents, as well as for controlling the interaction with the core material. The surface modified shell SiO2nanoparticles were found to be effectively adsorbed onto the core SiO2particles when mixed in toluene, while minimal adsorption was observed in ethanol. The obtained composite particles showed improved stability compared to raw core SiO2particles in toluene. The adsorption mechanism of the shell SiO2nanoparticles on the core particles in various organic solvents was proposed on the basis of surface-interaction measurements by atomic force microscopy colloidal probe methods. We believe that a long-range adhesive force between the shell SiO2nanoparticles and the core particles played an important role in promoting effective adsorption, allowing the formation of composite particles.