论文标题
蒸发诱导的无柄多组分液滴中表面活性剂的结晶
Evaporation-Induced Crystallization of Surfactants in Sessile Multicomponent Droplets
论文作者
论文摘要
表面活性剂已被广泛研究并用于控制液滴蒸发。在这项工作中，我们观察并研究了蒸发甘油 - 水混合物液滴中十二烷基硫酸钠（SDS）的结晶。结晶是由水的优先蒸发引起的，这降低了混合物中SDS的溶解度。结果，晶体屏蔽了液滴表面并停止蒸发。通过应用Raoult定律扩展的扩散模型来揭示一系列液滴尺寸的蒸发特性的普遍性。为了描述晶体的成核和生长，我们采用了温伯格的二维结晶模型[J.非晶体。固体1991，134，116]。该模型的结果与我们的实验结果相比。我们的发现可能会激发社区重新考虑高浓度表面活性剂在多组分蒸发系统中的作用。
Surfactants have been widely studied and used in controlling droplet evaporation. In this work, we observe and study the crystallization of sodium dodecyl sulfate (SDS) within an evaporating glycerol-water mixture droplet. The crystallization is induced by the preferential evaporation of water, which decreases the solubility of SDS in the mixture. As a consequence, the crystals shield the droplet surface and cease the evaporation. The universality of the evaporation characteristics for a range of droplet sizes is revealed by applying a diffusion model, extended by Raoult's law. To describe the nucleation and growth of the crystals, we employ the 2-dimensional crystallization model of Weinberg [J. Non-Cryst. Solids 1991, 134, 116]. The results of this model compare favorably to our experimental results. Our findings may inspire the community to reconsider the role of high concentration of surfactants in a multicomponent evaporation system.
