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首页> 外文期刊>Polymers for advanced technologies >Nano-emulsion use for the synthesis of polyaniline nano-grains or nano-fibers
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Nano-emulsion use for the synthesis of polyaniline nano-grains or nano-fibers

机译：纳米乳液用于合成聚苯胺纳米颗粒或纳米纤维

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We report that nano-emulsions can be creatively used as a morphology selective synthesis method to prepare not only nano-grains but also nano-fibers with high selectivity. Synthesis of the two different morphological materials was demonstrated using polyaniline synthesis as a model case. Polyaniline nano-grains were synthesized from aniline molecules in nano-size aqueous droplets as polymerization sites whose droplets were generated by inverse water-in-oil nano-emulsion use, and polyaniline nano-fibers were synthesized from aniline in aqueous nano-dimensional channels as polymerization sites whose channels were generated by direct oil-in-water nano-emulsion use containing high population of oil droplets. Using the approaches, we successfully synthesized nano-fibers of 60 nm diameter with 0.5 mm length and also nano-grains having diameter of 60-80 nm. The two different polymerization sites of nanoscale dimension were made by changing the ratio among surfactant, aqueous aniline/HCl solution, and oil, i.e. organic solvent. We found the nano-fibers synthesized from the channels formed by the direct oil-in-water nano-emulsion have higher bulk electrical conductivity than the nano-grains which were synthesized from the droplets formed by the inverse water-in-oil emulsion. We also found that the emulsion use allows us to use a room temperature synthesis unlike conventional synthesis methods which require to use ice bath temperature. Physical properties of both nanofibers and nano-grains synthesized were characterized by Fourier transform infrared (FTIR), UV-Vis spectra, scanning electron microscopy (SEM), and four probes conductivity measurement.
机译：我们报告纳米乳液可以创造性地用作一种形态选择性合成方法，不仅可以制备纳米颗粒，而且可以制备具有高选择性的纳米纤维。使用聚苯胺合成作为模型实例证明了两种不同形态材料的合成。聚苯胺纳米粒是由纳米大小的水滴中的苯胺分子作为聚合位点合成的，其液滴是通过油包水纳米乳液的逆反应而生成的，聚苯胺纳米纤维是由苯胺在水性纳米通道中合成的。其通道是通过直接水包油的纳米乳液的使用而产生的，其中包含大量的油滴。使用这些方法，我们成功地合成了长度为0.5 mm的直径为60 nm的纳米纤维以及直径为60-80 nm的纳米颗粒。通过改变表面活性剂，苯胺/ HCl水溶液和油即有机溶剂之间的比例来制得两个不同的纳米级聚合位点。我们发现，由直接水包油纳米乳液形成的通道合成的纳米纤维比由反油包水乳液形成的液滴合成的纳米颗粒具有更高的整体电导率。我们还发现乳液的使用使我们能够使用室温合成，这与需要使用冰浴温度的常规合成方法不同。通过傅立叶变换红外（FTIR），紫外-可见光谱，扫描电子显微镜（SEM）和四探针电导率测量来表征合成的纳米纤维和纳米颗粒的物理性能。

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