Department of Chemistry, University of Liverpool, Oxford Street, Liverpool L69 7ZD, UK.
Philos Trans A Math Phys Eng Sci. 2010 Sep 28;368(1927):4351-70. doi: 10.1098/rsta.2010.0136.
Porous nanospheres have a wide range of applications such as in catalysis, separation and controlled delivery. Among these nanospheres, syntheses and applications of porous silica nanospheres have been investigated extensively. Uniform porous silica nanospheres can be synthesized using a modified Stöber method. In the present study, porous silica spheres were prepared in the pre-formed emulsion-templated porous polyacrylamide (PAM). A hierarchical hybrid structure of mesoporous silica spheres was formed in the highly interconnected macroporous polymer. The polymer scaffold could be removed by calcination with porous silica spheres and the macroporous structures retained. This resulted from the close packing or aggregation of small silica nanospheres in the pores and on the surface of pores of PAM. The modified Stöber synthesis was further carried out in pre-formed polymer nanofibres (chitosan and sodium carboxymethyl cellulose). The structure of porous silica spheres on nanofibres was produced in the presence of the polymer or composite fibres. The corresponding inorganic structures were successfully obtained after calcination. The hierarchical structures of porous nanospheres within macroporous structures or on nanofibres are of potential interest to researchers in nanomaterials, porous polymers, supported catalysis and controlled delivery.
多孔纳米球具有广泛的应用，如在催化、分离和控制释放等领域。在这些纳米球中，多孔硅纳米球的合成和应用已经得到了广泛的研究。使用改进的 Stöber 方法可以合成均匀的多孔硅纳米球。在本研究中，在预先形成的乳液模板化多孔聚丙烯酰胺 (PAM) 中制备了多孔硅球。在高度相互连接的大孔聚合物中形成了介孔硅球的分级混合结构。通过煅烧可以去除聚合物支架，保留多孔硅球和大孔结构。这是由于 PAM 中的小孔和孔表面上的小硅纳米球的紧密堆积或聚集所致。在预先形成的聚合物纳米纤维（壳聚糖和羧甲基纤维素钠）中进一步进行了改进的 Stöber 合成。在聚合物或复合纤维存在下，在纳米纤维上制备了多孔硅球的结构。煅烧后成功获得了相应的无机结构。大孔结构内或纳米纤维上的多孔纳米球的分级结构对于纳米材料、多孔聚合物、负载催化和控制释放等领域的研究人员具有潜在的兴趣。
