Mesoscale Polymer Surfactants: Photolithographic Production and Localization at Droplet Interfaces,Journal of the American Chemical Society

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Mesoscale Polymer Surfactants: Photolithographic Production and Localization at Droplet Interfaces
Journal of the American Chemical Society ( IF 14.4 ) Pub Date : 2022-11-28 , DOI: 10.1021/jacs.2c09346
Zhefei Yang ₁ , Deborah Snyder ₁ , James Nicolas Pagaduan ₁ , Abraham Waldman _{1,

2} , Alfred J Crosby ₁ , Todd Emrick ₁

Affiliation

Stabilization of fluid droplets, classically as oil-in-water or water-in-oil emulsions, is typically conducted using molecular surfactants or small particulates that localize at oil–water interfaces. In this paper, we describe a method whereby thin polymer films are converted photolithographically to ribbon-like mesoscale objects, which, in turn, adsorb to fluid interfaces where they extend as appendages, or arms, from the droplet surface. These “mesoscale polymer surfactants”, or MPSs, were prepared from thin polymer films containing reactive functional moieties, including coumarin for photo-cross-linking, triphenylsulfonium for photoacid generation, and tert-butyl ester for solubility switching. The resultant MPSs, prepared initially on Si substrates, were released into water to reveal an exquisite shape sensitivity (forming straight, bent, or helical structures) and affinity for droplet interfaces based on their preparation conditions and the properties of the surrounding liquid. Notably, the lithographic techniques employed were amenable to differentiating the wettability of MPS segments, affording access to diblock-like MPSs which adhered to dispersed droplets via their hydrophobic segments, allowing their hydrophilic segments to extend into the continuous phase.

中文翻译：

中尺度聚合物表面活性剂：液滴界面的光刻生产和定位

液滴的稳定，通常是水包油或油包水乳液，通常使用位于油水界面的分子表面活性剂或小颗粒进行。在本文中，我们描述了一种方法，通过这种方法将聚合物薄膜通过光刻法转换为带状中尺度物体，这些物体反过来吸附到流体界面，在那里它们作为附属物或臂从液滴表面延伸。这些“中尺度聚合物表面活性剂”或 MPS 是由含有反应性功能部分的聚合物薄膜制备的，包括用于光交联的香豆素、用于光酸生成的三苯基硫和叔-用于溶解度转换的丁酯。最初在 Si 基板上制备的所得 MPS 被释放到水中，以根据其制备条件和周围液体的性质显示出精致的形状敏感性（形成直的、弯曲的或螺旋的结构）和对液滴界面的亲和力。值得注意的是，所采用的光刻技术适用于区分 MPS 链段的润湿性，从而获得类似二嵌段的 MPS，这些 MPS通过其疏水链段粘附在分散的液滴上，从而使其亲水链段延伸到连续相中。

更新日期：2022-11-28

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