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首页> 外文期刊>Colloids and Surfaces, A. Physicochemical and Engineering Aspects >Fabrication of composite particles by attaching surface-modified nanoparticles to core particles by wet processing in organic solvents
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Fabrication of composite particles by attaching surface-modified nanoparticles to core particles by wet processing in organic solvents

机译：通过在有机溶剂中湿法处理将表面改性的纳米粒子附着到核心粒子上来制造复合粒子

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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) SiO_2 particles, prepared by St?ber process, were applied as the core and shell materials, respectively. The surface of the shell SiO_2 nanoparticles 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 SiO_2 nanoparticles were found to be effectively adsorbed onto the core SiO_2 particles when mixed in toluene, while minimal adsorption was observed in ethanol. The obtained composite particles showed improved stability compared to raw core SiO_2 particles in toluene. The adsorption mechanism of the shell SiO_2 nanoparticles 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 SiO_2 nanoparticles and the core particles played an important role in promoting effective adsorption, allowing the formation of composite particles.
机译：开发了一种简单的湿法加工路线，该路线通过在有机溶剂中将高度分散的纳米颗粒吸附到核心颗粒上而形成复合颗粒，而不会形成强聚集体。该方法涉及一个简单的混合过程，该过程使用核颗粒和表面改性的高度分散的纳米颗粒（壳纳米颗粒）在有机溶剂中进行超声处理。作为模型研究，分别将通过St？ber工艺制备的亚微米级（约400 nm）和纳米级（约30 nm）SiO_2颗粒用作核材料和壳材料。壳层SiO_2纳米颗粒的表面通过一层层的方法修饰，该过程涉及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的吸附，以改善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。当在甲苯中混合时，发现表面改性的壳SiO_2纳米颗粒可有效吸附到核心SiO_2颗粒上，而在乙醇中观察到的吸附最少。与在甲苯中的原始核SiO_2颗粒相比，所获得的复合颗粒显示出改善的稳定性。基于原子力显微镜胶体探针法的表面相互作用测量结果，提出了壳SiO_2纳米粒子在各种有机溶剂中对核心粒子的吸附机理。我们认为，壳SiO_2纳米颗粒与核颗粒之间的长距离粘附力在促进有效吸附，形成复合颗粒方面起着重要作用。

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