Automated process for improved uniformity and versatility of layer-by-layer deposition
Automated process for improved uniformity and versatility of layer-by-layer deposition
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DOI：
10.1021/la063085b
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发表时间：
2007-03-13
期刊：
影响因子：
3.9
通讯作者：
Hammond, P. T.
中科院分区：
文献类型：
--
作者：
Krogman, K. C.;Zacharia, N. S.;Hammond, P. T.
最近开发的实践中，喷涂到基板上的解决方案，以构建薄膜通过逐层技术已被进一步研究和扩展。在这里，我们描述了一个完全自动化的系统，能够沉积薄的聚合物薄膜从雾化雾的解决方案含有物种的互补功能。薄膜的生长被证明是类似于传统的“浸渍”LBL组件，而报告的技术使我们能够实现25倍的减少处理时间。此外，完全自动化消除了人为干扰和操作员引起不均匀的可能性。我们通过沉积弱和强双金属膜、氢键膜、树枝状化合物和纳米颗粒扩展了喷雾LbL技术的多功能性，拓宽了其未来应用范围。最后，该技术用于从水溶液中均匀地涂覆原本疏水的基材。ESEM图像表明，雾化过程中产生的基板内的单个纳米纤维的保形涂层，大大改变了宏观表面的亲水性。这种自动化系统可以轻松转换为喷嘴组阵列，并可以应用于大面积纺织材料的快速、均匀涂覆。
The recently developed practice of spraying polyelectrolyte solutions onto a substrate in order to construct thin films via the layer-by-layer technique has been further investigated and extended. Here we describe a fully automated system capable of depositing thin polymer films from atomized mists of solutions containing species of complementary functionality. Film growth is shown to be similar to that in conventional "dipped" LbL assembly, whereas the reported technology allows us to realize 25-fold decreases in process times. Furthermore, complete automation removes human interaction and the possibility of operator-induced nonuniformities. We extend the versatility of the spray LbL technology by depositing both weak and strong polyelectrolyte films, hydrogen-bonded films, and dendritic compounds and nanoparticles, broadening its range of future applications. Finally, the technology is used to uniformly coat an otherwise hydrophobic substrate from aqueous solutions. ESEM images indicate that the atomization process produces a conformal coating of individual nanofibers within the substrate, dramatically changing the hydrophilicity of the macroscopic surface. Such an automated system is easily converted to an array of nozzle banks and could find application in the rapid, uniform coating of large areas of textile materials.