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首页> 美国卫生研究院文献>International Journal of Molecular Sciences >Pattern Formation upon Evaporation of Sessile Droplets of Polyelectrolyte/Surfactant Mixtures on Silicon Wafers
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Pattern Formation upon Evaporation of Sessile Droplets of Polyelectrolyte/Surfactant Mixtures on Silicon Wafers

机译：在硅晶片上蒸发聚电解质/表面活性剂混合物的静脉液滴时形成图案形成

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摘要

The formation of coffee-ring deposits upon evaporation of sessile droplets containing mixtures of poly(diallyldimethylammonium chloride) (PDADMAC) and two different anionic surfactants were studied. This process is driven by the Marangoni stresses resulting from the formation of surface-active polyelectrolyte–surfactant complexes in solution and the salt arising from the release of counterions. The morphologies of the deposits appear to be dependent on the surfactant concentration, independent of their chemical nature, and consist of a peripheral coffee ring composed of PDADMAC and PDADMAC–surfactant complexes, and a secondary region of dendrite-like structures of pure NaCl at the interior of the residue formed at the end of the evaporation. This is compatible with a hydrodynamic flow associated with the Marangoni stress from the apex of the drop to the three-phase contact line for those cases in which the concentration of the complexes dominates the surface tension, whereas it is reversed when most of the PDADMAC and the complexes have been deposited at the rim and the bulk contains mainly salt.
机译：研究了蒸发含有聚（二烯二甲基氯化铵）（PDADMAC）和两种不同的阴离子表面活性剂的混合物的术牙齿液体蒸煮时的形成。该方法由Marangoni应力驱动，由溶液中的溶液中形成的表面活性聚电解质 - 表面活性剂复合物和由抗衡离子释放产生的盐形成。沉积物的形态似乎依赖于表面活性剂浓度，与其化学性质无关，并且由由PDADMAC和PDADMAC-表面活性剂复合物组成的外周咖啡环，以及在纯NaCl的树突状结构的次级区域。残留物的内部形成在蒸发结束时。这与与玛龙尼应力相关的流体动力学流动与来自下降到三相接触线相关的那些病例，其中络合物浓度主导地表张力的情况下，而当大多数PDADMAC和时，它在逆转时逆转这些配合物已经沉积在边缘，散装主要含盐。

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