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首页> 外文期刊>Chemistry: A European journal >Layer-by-Layer Assembly of Polyelectrolyte and Nanoparticles, Monitored by Capillary Electrophoresis
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Layer-by-Layer Assembly of Polyelectrolyte and Nanoparticles, Monitored by Capillary Electrophoresis

机译：毛细管电泳监测聚电解质和纳米颗粒的逐层组装

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Layer-by-layer (LBL) assembly is a versatile nanofabrication technique, and investigation of its kinetics is essential for understanding the assembly mechanism and optimizing the assembly procedure. In this work, the LBL assembly of polyelectrolyte and nanoparticles were monitored in situ by capillary electrophoresis (CE) for the first time. The assembly of poly(diallyldimethylammonium chloride) (PDDA), and gold nanoparticles (AuNPs) on capillary walls causes surface-charge neutralization and resaturation, and thus yields synchronous changes in the electroosmotic flow (EOF). The EOF data show that formation of multilayers follows first-order adsorption kinetics. On the basis of the fit results, influencing factors, including number of layers, concentration of materials, flow rate, and size of AuNPs, were investigated. The stability and robustness of the assembled coatings were also characterized by CE. It was found that degradation of PDDA layers follows first-order chemical kinetics, while desorption of AuNPs takes place in a disorderly manner. The substrate strongly affects assembly of the underlying layer, while this effect is rapidly screened with increasing number of layers. Furthermore, we demonstrate that the EOF measuring step does not disturb LBL assembly, and the proposed method is reliable and rugged. This work not only studies in detail the LBL adsorption/desorption process of polyelectrolyte and nanoparticles, but also offers an alternative tool for monitoring multilayer buildup. It may also reveal the potential of CE in fields other than analytical separation.
机译：逐层（LBL）组装是一种通用的纳米制造技术，对其动力学的研究对于理解组装机理和优化组装过程至关重要。在这项工作中，首次通过毛细管电泳（CE）现场监测了聚电解质和纳米颗粒的LBL组装。聚二烯丙基二甲基氯化铵（PDDA）和金纳米颗粒（AuNPs）在毛细管壁上的组装导致表面电荷中和和再饱和，因此在电渗流（EOF）中产生同步变化。 EOF数据表明，多层的形成遵循一级吸附动力学。在拟合结果的基础上，研究了影响因素，包括层数，材料浓度，流速和AuNPs的大小。 CE还对组装好的涂层的稳定性和坚固性进行了表征。发现PDDA层的降解遵循一阶化学动力学，而AuNP的解吸以无序方式发生。基材强烈影响下层的组装，而随着层数的增加，这种效果会迅速被屏蔽。此外，我们证明了EOF测量步骤不会干扰LBL组装，并且所提出的方法可靠且坚固耐用。这项工作不仅详细研究了聚电解质和纳米颗粒的LBL吸附/解吸过程，而且为监测多层堆积提供了一种替代工具。它也可能揭示CE在分析分离以外领域中的潜力。

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