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首页> 外文期刊>RSC Advances >Biomimetic silica deposition promoted by sub-5 μm complexes of dicarboxylic acids/polyethyleneimine microballs: a new approach to tuning silica structures using messenger-like dicarboxylic acids
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Biomimetic silica deposition promoted by sub-5 μm complexes of dicarboxylic acids/polyethyleneimine microballs: a new approach to tuning silica structures using messenger-like dicarboxylic acids

机译：二羧酸/聚乙烯亚胺微球的亚5μm配合物促进仿生二氧化硅沉积：使用类似信使的二羧酸调节二氧化硅结构的新方法

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Acid–base complexes prepared from sub-5 μm polyethyleneimine (PEI) microballs and dicarboxylic acids such as adipic acid (AA), succinic acid (SA), meso-tartaric acid (m-TA) as well as mucic acid (MA) were used as catalytic templates in hydrolytic condensation of tetramethoxy silane (TMOS). By means of FT-IR, 13C NMR, 29Si NMR, XRD, SEM, TGA and nitrogen sorption isotherms, we thoroughly investigated the effects of the dicarboxylic acids complexed with PEI microballs on the resultant silica structures. We found that in this silica deposition process, the presence of the dicarboxylic acids of adipic acid (AA) and succinic acid (SA), which do not have alcoholic groups, could adapt to deposit high content of silica than the alcoholic acids of meso-tartaric acid (m-TA) and mucic acid (MA). More interestingly, the surface structures of the resultant silica microballs were different with different types of acids. The presence of m-TA and MA with meso-type alcoholic structures produced nanofibre or nanoplate-covered silica microballs, while the presence of AA and SA led to the formation of nanoparticles-covered silica microballs. Accompanying these structural features, the BET surface areas of the four types of acid-mediated silica microballs after calcination at 800 °C appeared remarkably different with the order of 615 > 430 > 133 > 96 m2 g?1, respectively, corresponding to the contribution of MA, m-TA, SA and AA. These results evidently indicate that the structures of the dicarboxylic acids associated with PEI microballs play a messenger-like role to tune the silica structures.
机译：由亚5微米以下的聚乙烯亚胺（PEI）微球和己二酸（AA），琥珀酸（SA）， meso -酒石酸（ m -TA）以及粘液酸（MA）用作四甲氧基硅烷（TMOS）水解缩合的催化模板。借助FT-IR， 13 C NMR， 29 Si NMR，XRD，SEM，TGA和氮吸附等温线，我们彻底研究了与PEI微球络合的二羧酸对所得二氧化硅结构的影响。我们发现，在这种二氧化硅沉积过程中，不具有醇基的己二酸（AA）和琥珀酸（SA）的二元羧酸的存在比 >间酒石酸（ m -TA）和粘液酸（MA）。更有趣的是，所得的二氧化硅微球的表面结构随酸的类型不同而不同。具有 meso 型醇结构的 m -TA和MA的存在产生了纳米纤维或纳米板覆盖的二氧化硅微球，而AA和SA的存在导致了纳米颗粒的形成覆盖的二氧化硅微球。伴随这些结构特征，四种类型的酸介导的二氧化硅微球在800°C煅烧后的BET表面积明显不同，顺序为615> 430> 133> 96 m 2 g ？1 分别对应于MA， m -TA，SA和AA的贡献。这些结果显然表明，与PEI微球相关的二元羧酸的结构在调节二氧化硅结构方面起着使者的作用。

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