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Dual Soft-Template System Based on Colloidal Chemistry for the Synthesis of Hollow Mesoporous Silica Nanoparticles

机译:基于胶体化学的双重软模板系统用于中空二氧化硅纳米粒子的合成

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A new dual soft-template system comprising the asymmetric triblock copolymer poly(styrene-b-2-vinyl pyridine-b-ethylene oxide) (PS-b-P2VP-b-PEO) and the cationic surfactant cetyltrimethylammonium bromide (CTAB) is used to synthesize hollow mesoporous silica (HMS) nanoparticles with a center void of around 17nm. The stable PS-b-P2VP-b-PEO polymeric micelle serves as a template to form the hollow interior, while the CTAB surfactant serves as a template to form mesopores in the shells. The P2VP blocks on the polymeric micelles can interact with positively charged CTA(+) ions via negatively charged hydrolyzed silica species. Thus, dual soft-templates clearly have different roles for the preparation of the HMS nanoparticles. Interestingly, the thicknesses of the mesoporous shell are tunable by varying the amounts of TEOS and CTAB. This study provides new insight on the preparation of mesoporous materials based on colloidal chemistry.
机译:使用了新的双重软模板系统,该系统包含不对称三嵌段共聚物聚(苯乙烯-b-2-乙烯基吡啶-b-环氧乙烷)(PS-b-P2VP-b-PEO)和阳离子表面活性剂十六烷基三甲基溴化铵(CTAB)合成中心空隙约为17nm的中空介孔二氧化硅(HMS)纳米粒子。稳定的PS-b-P2VP-b-PEO聚合物胶束充当模板以形成中空内部,而CTAB表面活性剂充当模板以在壳中形成中孔。聚合物胶束上的P2VP嵌段可通过带负电荷的水解二氧化硅与带正电荷的CTA(+)离子相互作用。因此,双重软模板显然对于HMS纳米颗粒的制备具有不同的作用。有趣的是,中孔壳的厚度可通过改变TEOS和CTAB的量来调节。这项研究为基于胶体化学制备介孔材料提供了新的见识。

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