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首页> 美国卫生研究院文献>Polymers >Raspberry-Like Polysilsesquioxane Particles with Hollow-Spheres-on-Sphere Structure: Rational Design Controllable Synthesis and Catalytic Application
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Raspberry-Like Polysilsesquioxane Particles with Hollow-Spheres-on-Sphere Structure: Rational Design Controllable Synthesis and Catalytic Application

机译：具有空心球结构的树莓状聚倍半硅氧烷颗粒：合理设计可控合成和催化应用

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Raspberry-like hollow-spheres-on-sphere (HSOS) particles with reactive surfaces, uniform sizes and monodisperse properties were rational designed and fabricated to immobilize gold nanoparticles for the catalytic reduction of 4-nitrophenol. HSOS polysilsesquioxane (PSQ) particles were constructed by an organic alkali catalyzed sol-gel process from trialkoxysilane precursors with stabilized polystyrene (PS) nanoparticles as both a sacrifice template and a Pickering emulsifier. The PSQ particles were fabricated in an ice bath with methyltrimethoxysilane and mercaptopropyltrimethoxysiane as a co-precursor, tetramethylammonium hydroxide (TMAH) as a catalyst, polyvinylpyrrolidone (PVP) and sodium lignosulfonat as co-stabilizers and PS latex as a hard template. The formation mechanism of the hierarchical particles was investigated in detail by the time study through imaging the particles at regular time intervals during the reaction process. Various effect factors on the morphology were studied systematically which showed that the precursor composition, the content of PS, TMAH and PVP are the most important factors. The hierarchical structure combined with the mercaptopropyl groups on both the surface and the skeleton to make it possible to adsorb guest molecules. Au nanoparticles were immobilized on the particles for the catalytic reduction of 4-nitrophenol to 4-aminophenol. The unique PSQ colloids with hollow-spheres-on-sphere extended the family of the hierarchical structures and has shown the potential applications in separations, drug delivery and heterogeneous catalysts.
机译：合理设计并制造了具有反应性表面，均一尺寸和单分散性质的覆盆子状球形空心球（HSOS）颗粒，以固定金纳米颗粒用于催化还原4-硝基苯酚。 HSOS聚倍半硅氧烷（PSQ）颗粒是由三烷氧基硅烷前体与稳定的聚苯乙烯（PS）纳米颗粒同时作为牺牲模板和Pickering乳化剂，通过有机碱催化的溶胶-凝胶工艺构建的。 PSQ颗粒是在冰浴中以甲基三甲氧基硅烷和巯基丙基三甲氧基硅烷为共前体，氢氧化四甲基铵（TMAH）为催化剂，聚乙烯吡咯烷酮（PVP）和木质素磺化钠作为共稳定剂以及PS胶乳作为硬模板制备的。通过在反应过程中以规则的时间间隔对粒子进行成像的时间研究，详细研究了分层粒子的形成机理。系统地研究了影响形貌的各种因素，表明前体组成，PS，TMAH和PVP含量是最重要的因素。层次结构与表面和骨架上的巯基丙基结合在一起，可以吸附客体分子。将金纳米颗粒固定在颗粒上以将4-硝基苯酚催化还原成4-氨基苯酚。具有球形空心球的独特PSQ胶体扩展了分层结构的族，并显示了在分离，药物输送和非均相催化剂中的潜在应用。

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