Title：Dendritic and Core–Shell–Corona Mesoporous Sister Nanospheres from Polymer–Surfactant–Silica Self-Entanglement

华东师范大学张坤教授课题组在树枝状和其他形貌的介孔碳、二氧化硅纳米颗粒的合成领域又取得了重要的研究进展，利用单一阳离子表面活性软模板合成策略一步实现了介孔C/SiO2纳米颗粒的量化合成，而且深入探讨了不同形貌的纳米球的形成机理。本论文第一次一步法实现了树枝状（或者发散状）和 Core-Shell-Corona介孔炭球的简单合成。并且大分子参与的固体酸烷基化反应表明： 树枝状孔道结构相比于其他核壳结构更有利于底物的扩散和酸催化活性中心的接触 。该材料利用气固相发烟硫酸处理极易修饰磺酸功能基团。该合成策略所制备的材料有望在催化剂载体、环境以及电池材料制备等重要领域引起广泛关注。

Abstract（摘要）：Mesoporous nanospheres are highly regarded for their applications in nanomedicine, optical devices, batteries, nanofiltration, and heterogeneous catalysis. In the last field, the dendritic morphology, which favors molecular diffusion, is a very important morphology known for silica, but not yet for carbon. A one-pot, easy, and scalable co-sol–gel route by using the triphasic resol–surfactant–silica system is shown to yield the topologies of dendritic and core–shell–corona mesoporous sister nanospheres by inner radial phase speciation control on a mass-transfer-limited process, depending on the relative polycondensation rates of the resol polymer and silica phases. The trick was the use of polyolamines with different catalytic activities on each hard phase polycondensation. The self-entanglement of phases is produced at the {O−, S+, I−} organic–surfactant–inorganic interface. Mono- and biphasic mesoporous sister nanospheres of carbon and/or silica are derivatized from each mother nanospheres and called “syntaxic” because of similar sizes and mirrored morphologies. Comparing these “false twins”, or yin and yang mesoporous nanospheres, functionalized by sulfonic groups provides evidence of the superiority of the dendritic topologies and the absence of a shell on the diffusion-controlled catalytic alkylation of m-cresol.




该文的链接如下：
http://onlinelibrary.wiley.com/doi/10.1002/chem.201704714/full
PDF连接：http://onlinelibrary.wiley.com/doi/10.1002/chem.201704714/epdf
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