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首页> 外文会议>NATO Advanced Research Workshop on Nanostructured Materials and Coatings for Biomedical and Sensor Applications Aug 4-8, 2002 Kyiv, Ukraine >NANOSTRUCTURED MESOPOROUS SILICA FILMS
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NANOSTRUCTURED MESOPOROUS SILICA FILMS

机译：纳米结构微孔二氧化硅膜

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摘要

The lyotropic liquid crystalline phases of surfactants have been used as templates for the synthesis of mesoporous nanostructured materials. To achieve direct templating by liquid crystalline phases, surfactant concentrations in excess of 30 wt% in water are used. In the case of silicas and metallosilicates the materials are obtained as monolithic objects with typical dimensions greater than 5 mm. Here we report on the processing of thin films of nanostructured mesoporous silicas by dip coating from mixtures that contain high surfactant concentrations. We find that the addition of methanol to the reaction mixture facilitates the formation of uniform, crack-free films. By altering the surfactant to water ratio we were able to obtain films that had micellar cubic (I_1), normal topology hexagonal (H_I), or lamellar (L_α) organization. Calcination of these films afforded adherent films that in most cases retained the long-ranged architecture of the liquid crystalline phase. The methanol concentration of the dip-coating mixture was observed to have no effect on the structural parameters of the resulting calcined films.
机译：表面活性剂的溶致液晶相已经用作合成中孔纳米结构材料的模板。为了通过液晶相实现直接模板化，使用了在水中超过30重量％的表面活性剂浓度。在二氧化硅和金属硅酸盐的情况下，获得的材料为单块物体，典型尺寸大于5mm。在这里，我们报道了通过从含有高表面活性剂浓度的混合物中浸涂来处理纳米结构介孔二氧化硅薄膜的过程。我们发现，向反应混合物中添加甲醇有助于形成均匀，无裂纹的膜。通过改变表面活性剂与水的比例，我们能够获得具有胶束立方（I_1），正态拓扑六边形（H_I）或层状（L_α）组织的薄膜。这些膜的煅烧提供了粘附膜，该粘附膜在大多数情况下保留了液晶相的长期结构。观察到浸涂混合物的甲醇浓度对所得煅烧膜的结构参数没有影响。

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