Evaporation-Induced Crystallization of Surfactants in Sessile Multicomponent Droplets.,Langmuir

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Evaporation-Induced Crystallization of Surfactants in Sessile Multicomponent Droplets.
Langmuir ( IF 3.7 ) Pub Date : 2020-06-15 , DOI: 10.1021/acs.langmuir.0c01169
Yaxing Li ₁ , Valentin Salvator ₁ , Herman Wijshoff _{2,

3} , Michel Versluis ₁ , Detlef Lohse _{1,

4}

Affiliation

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. Solids1991, 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.

中文翻译：

无溶剂多组分液滴中表面活性剂的蒸发诱导结晶。

表面活性剂已被广泛研究并用于控制液滴的蒸发。在这项工作中，我们观察并研究了蒸发的甘油-水混合物液滴中十二烷基硫酸钠（SDS）的结晶。水的优先蒸发引起结晶，这降低了SDS在混合物中的溶解度。结果，晶体屏蔽了液滴表面并停止了蒸发。通过应用由拉乌尔定律扩展的扩散模型，可以揭示一系列液滴尺寸的蒸发特性的普遍性。为了描述晶体的形核和生长，我们采用了Weinberg的二维结晶模型[ J. Non-Cryst。固体1991年，134，116]。该模型的结果与我们的实验结果相比具有优势。我们的发现可能会启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。

更新日期：2020-07-07

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