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Surfactant-mediated self-assembly of nanocrystals to form hierarchically structured zeolite thin films with controlled crystal orientation

机译：表面活性剂介导的纳米晶体自组装以形成具有受控晶体取向的分层结构的沸石薄膜

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We report on a scalable wet deposition to simultaneously manipulate the self-assembly and orientation of zeolite Linde Type A (LTA) nanocrystals. This process, referred to as surfactant-mediated self-assembly (SMSA), creates zeolite LTA thin films with long-range ordered cylindrical patterns, wherein {100} faces of the crystals are preferably oriented parallel to the support surface. This approach makes it possible to control the diameter as well as the depth of the cylindrical patterns in zeolite thin films fabricated via scalable wet deposition. To elucidate the mechanism underlying the SMSA process, we applied in situ imaging to cast solutions subjected to a temperature swing. Our results indicate that the cylindrical patterns may be developed from micelles of the surfactant, which make up a thermodynamic phase in the cast solution. We also demonstrate that the apparent dielectric constant and optical haze of the zeolite LTA thin films can be engineered by altering the dimensions of the cylindrical patterns.
机译：我们报告了可扩展的湿法沉积，以同时操纵沸石Linde A型（LTA）纳米晶体的自组装和取向。该过程称为表面活性剂介导的自组装（SMSA），可产生具有长程有序圆柱状图案的沸石LTA薄膜，其中晶体的{100}面优选平行于支撑面取向。通过这种方法，可以控制通过可扩展的湿法沉积 制备的沸石薄膜的直径以及圆柱图案的深度。为了阐明SMSA过程的机理，我们将原位成像应用于浇铸温度波动的溶液。我们的结果表明，圆柱形图案可能是由表面活性剂的胶束形成的，这些胶束构成了浇铸溶液中的热力学相。我们还证明，可以通过改变圆柱图案的尺寸来设计沸石LTA薄膜的表观介电常数和光学雾度。

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