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首页> 外文期刊>Chemistry: A European journal >Encapsulation of dye molecules and nanoparticles in hollow organogel fibers of a nonchiral polyurethane model compound
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Encapsulation of dye molecules and nanoparticles in hollow organogel fibers of a nonchiral polyurethane model compound

机译：非手性聚氨酯模型化合物的空心有机凝胶纤维中染料分子和纳米颗粒的包封

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摘要

We present the case of a nonchiral organogelator that forms hollow fibers and encapsulates silver nanoparticles (SNP) and a dye molecule. The biscarbamate molecule (a model compound for polyurethanes), which has two hydrogen-bonding motifs symmetrically attached to n-dodecyl side chains (C12), gels benzonitrile with hollow fibrillar morphology. The C12 molecules form sheets that eventually wrap into hollow fibers to form the gel network. Herein, two-component gels were prepared with C12 as one component and SNP, phthalocyanine (Pc), or perylene (Pe) as the other. Microscopic analysis and partial melting experiments confirmed the inclusion of the silver nanoparticles and phthalocyanine into the hollow fibers. On the other hand, Pe molecules tend to form crystals at the outer surface of the C12 fibers, which results in a significant increase in the width of the gel fibers. This difference in the behavior of Pc and Pe molecules were accounted for by their crystal geometry and significantly different crystal growth rate compared with that of C12 fiber formation in the gels. Pc crystallizes in a needle shape that facilitates occlusion in the gel fibers, whereas Pe forms large platelets. X-ray diffraction and spectroscopic analysis of the two-component gels along with their neat components confirmed that there was no change in the packing behavior of the Pc and Pe molecules in the gels. Therefore, these are examples of two-component physical gels in which the Pc crystals are occluded within the hollow fibers of C12 by physical mixing of the components without the aid of any inter-molecular interactions between the different components. We have thus shown that lumen-loaded gel fibers with nanoparticles and dye molecules can be prepared by the two-component gel route, provided that the above growth rate, shape, and size conditions are satisfied.
机译：我们介绍了一种非手性有机胶凝剂的情况，它形成了中空纤维并封装了银纳米颗粒（SNP）和染料分子。具有两个对称于正十二烷基侧链（C12）的氢键基序的双氨基甲酸酯分子（胶结剂）使带有中空原纤维形态的苄腈凝胶化。 C12分子形成薄片，最终包裹到中空纤维中以形成凝胶网络。在此，制备了以C12作为一种组分而SNP，酞菁（Pc）或per（Pe）作为另一种组分的两组分凝胶。显微镜分析和部分熔融实验证实了中空纤维中包含了银纳米颗粒和酞菁。另一方面，Pe分子倾向于在C12纤维的外表面形成晶体，这导致凝胶纤维宽度的显着增加。 Pc和Pe分子行为的差异是由它们的晶体几何形状和与凝胶中C12纤维形成的晶体生长速率相比有显着差异造成的。 Pc以针状结晶，有利于凝胶纤维的阻塞，而Pe形成大的血小板。两组分凝胶及其纯组分的X射线衍射和光谱分析证实，凝胶中Pc和Pe分子的堆积行为没有改变。因此，这些是两组分物理凝胶的例子，其中，通过物理混合各组分而在不同组分之间没有任何分子间相互作用的情况下，Pc晶体被吸留在C12的中空纤维内。因此，我们已经表明，只要满足上述生长速率，形状和尺寸条件，就可以通过双组分凝胶途径制备具有纳米颗粒和染料分子的内腔负载凝胶纤维。

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