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首页> 外文期刊>Advanced Materials >Fluorinated-Surfactant-Templated Synthesis of Hollow Silica Particles with a Single Layer of Mesopores in Their Shells
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Fluorinated-Surfactant-Templated Synthesis of Hollow Silica Particles with a Single Layer of Mesopores in Their Shells

机译：含氟表面活性剂模板的壳中具有单层中孔的空心二氧化硅颗粒的合成

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Vesicles are important self-organized structures that are finding increasing use in drug delivery and biomimetic applications. The bilayer shells of ordinary vesicles are fragile and prone to dissolution and collapse as solution conditions change. If comparable solid structures could be formed using biocompatible materials such as silica, the resulting materials would be stable replacements, useful for drug delivery or for novel applications such as high-capacity gas adsorption. Vesicle-like hollow silica particles have been synthesized through sol-gel polymerization in the presence of non-ionic and catanionic surfactants. In a few cases, cationic surfactants were also used to create hollow silica particles. However, special processes were needed to create the particles, and most of them had multilamellar shells. Hubert et al. described the only example to date of direct coating of pre-existing unilamellar vesicles to generate single-walled hollow silica particles in an extrusion process. The pore structure of the shells of these particles has not been directly characterized, but they are expected to be microporous, since they consist of solid concentric shells of silica. In this communication, we report a new type of vesicle-like hollow silica with ordered mesoporous single-walled shells, which is prepared by co-assembly of silica with a fluorinated surfactant template. Fluori-nated surfactants have been employed as pore templates for ceramics, but there have been no reports to date of spontaneous formation of vesicle-like structures. By changing the shearing rate during synthesis, we show that elongated silica particles with multiple hollow chambers can be obtained.
机译：囊泡是重要的自组织结构，在药物递送和仿生应用中发现其越来越多的使用。普通囊泡的双层壳是易碎的，并且随着溶液条件的变化而易于溶解和崩解。如果可以使用生物相容性材料（例如二氧化硅）形成可比的固体结构，则所得材料将是稳定的替代品，可用于药物输送或用于新型应用（例如高容量气体吸附）。在非离子和阳离子表面活性剂的存在下，通过溶胶-凝胶聚合合成了囊状中空二氧化硅颗粒。在少数情况下，阳离子表面活性剂也可用于产生空心二氧化硅颗粒。但是，需要特殊的工艺来制造颗粒，并且其中大多数具有多层壳。休伯特等。文献描述了迄今为止唯一的直接存在的单层囊泡直接包衣以在挤出过程中产生单壁空心二氧化硅颗粒的例子。这些颗粒的壳的孔结构尚未直接表征，但是由于它们由二氧化硅的同心实心壳组成，因此有望成为微孔。在此通报中，我们报道了一种新型的有序介孔单壁壳的囊泡状中空二氧化硅，其是通过将二氧化硅与氟化表面活性剂模板共组装而制备的。氟化表面活性剂已被用作陶瓷的孔模板，但是迄今为止还没有自发形成囊状结构的报道。通过改变合成过程中的剪切速率，我们表明可以获得具有多个中空室的细长二氧化硅颗粒。

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