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首页> 外文期刊>Composites Science and Technology >Electrophoretic deposition: Novel in situ film growth mechanism of carbon nanocomposite films within non-conductive fabrics for multi-scale hybrid composites
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Electrophoretic deposition: Novel in situ film growth mechanism of carbon nanocomposite films within non-conductive fabrics for multi-scale hybrid composites

机译：电泳沉积：多尺度杂交复合材料的非导电织物内的碳纳米复合膜的原位膜生长机理新颖

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摘要

A novel electrophoretic deposition (EPD) technique is developed to create uniform coatings of functionalized carbon nanotubes (CNTs) on non-conductive fabrics. EPD enables the creation of porous CNT composite films not just on the outer surface of the fabrics but onto individual fibers within fiber bundles or woven fabrics. This process can be conducted at room temperature without using any hazardous chemicals, making it inherently scalable, and can be applied to a wide range of fibers and textile structures to fabricate mechanically reinforced or multifunctional composites. A key advantage of EPD is the ability to control the CNT film thickness and microstructure because of the unique in situ film formation mechanism and by varying the process parameters. Unlike the mechanism for conductive carbon fibers, results for glass fibers suggest that positively charged nanotubes are destabilized by a local pH gradient and precipitate onto the negative electrode, which is followed by CNT film growth onto the fibers in direct contact with the electrode. Intimate contact is critical for both film extension from the electrode to fiber and throughout the filaments in a fabric. The electrically conductive CNT film acts as an extension of the electrode, promoting deposition throughout the fabric. Our model system studies aqueous dispersions of multi-walled CNTs functionalized with polyethyleneimine (PEI) deposited onto glass fibers. Key experiments are designed at different length scales, from single filaments to macroscopic composite rods, to visualize the film formation.
机译：开发了一种新型电泳沉积（EPD）技术以在非导电织物上产生均匀的官能化碳纳米管（CNT）的均匀涂层。 EPD能够创建不仅在织物的外表面上的多孔CNT复合薄膜，而是在纤维束或织造织物内的单个纤维上。该方法可以在室温下进行而不使用任何危险化学品，使其具有固有的可扩展性，并且可以应用于各种纤维和纺织结构以制造机械增强或多功能复合材料。 EPD的一个关键优势是控制CNT膜厚度和微观结构的能力，因为原位膜形成机制独特，并改变工艺参数。与导电碳纤维的机制不同，玻璃纤维的结果表明，带正电荷的纳米管通过局部pH梯度沉淀并沉淀到负电极上，然后将CNT膜生长与电极直接接触到纤维上。亲密接触对于从电极到纤维和整个织物中的长丝的薄膜延伸至关重要。导电CNT膜用作电极的延伸，促进整个织物的沉积。我们的模型系统研究用沉积在玻璃纤维上的聚乙烯亚胺（PEI）官能化的多壁CNT水分散体。关键实验以不同的长度尺度设计，从单根长丝到宏观复合杆，以可视化成膜。

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