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首页> 外文期刊>Crystal growth & design >Surface induced order of solution processed caffeine needles on silica and muscovite mica
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Surface induced order of solution processed caffeine needles on silica and muscovite mica

机译：溶液处理的咖啡因针在二氧化硅和白云母上的表面诱导顺序

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摘要

In this work the orientational order of needleshaped caffeine crystallites at silica and muscovite mica surfaces is investigated by X-ray diffraction experiment and optical microscopy. The investigation of thin films reveals the formation of caffeine in the anhydrous monoclinic ?- polymorphic structure independent of the surface with the disclike caffeine molecules assemble in an edge-on conformation. The silica surface provides isotropic properties for crystal growth which leads to a fiber texture arrangement of the needles; a majority of needles have a 010 texture with all other directions being randomly distributed. The mica surface with its highly regular surface structure induces defined textures and azimuthal order of the caffeine needles resulting in a fully defined epitaxial order. The edge-on and disclike caffeine molecules align along the [100]_m, [110]_m, and [110]_m real space directions of the mica substrate and show a mirror symmetry around the [110]_m. The experiments on these two surfaces show that the type of surface is able to induce order during caffeine needle growth.
机译：在这项工作中，通过X射线衍射实验和光学显微镜研究了针状咖啡因微晶在二氧化硅和白云母云母表面的取向顺序。对薄膜的研究揭示了咖啡因在无水单斜晶系α-多晶型结构中的形成，该结构与表面无关，且盘状咖啡因分子以边缘构象组装。二氧化硅表面为晶体生长提供各向同性的特性，从而导致针的纤维织构排列。大多数针具有010质感，而所有其他方向都是随机分布的。云母表面具有高度规则的表面结构，可诱导咖啡因针的确定的质地和方位角顺序，从而导致完全确定的外延顺序。边缘和盘状咖啡因分子沿云母基质的[100] _m，[110] _m和[110] _m实际空间方向排列，并在[110] _m周围呈镜像对称。在这两个表面上的实验表明，表面类型能够在咖啡因针生长过程中诱导顺序。

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