High Internal Phase Pickering Emulsions as Templates for a Cellulosic Functional Porous Material,ACS Sustainable Chemistry & Engineering

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High Internal Phase Pickering Emulsions as Templates for a Cellulosic Functional Porous Material
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2020-02-24 , DOI: 10.1021/acssuschemeng.9b06577
Navid Bizmark ₁ , Xiaoyu Du ₁ , Marios A. Ioannidis ₁

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Emulsions stabilized by solid particles (Pickering emulsions) are remarkably more resistant to coalescence than emulsions generated with molecular surfactants. If enriched to at least 0.74 by volume fraction of the dispersed phase, then these so-called high internal phase Pickering emulsions (HIPPEs) find important use as templates for the fabrication of a wide spectrum of functional porous materials. Starting with ethyl cellulose (EC)—a nontoxic, food-grade, and biocompatible polymer derived from abundant cellulose—we show how spherical EC nanoparticles can be used to generate oil-in-water (O/W) or water-in-oil (W/O) Pickering emulsions without surfactants. We explore the conditions of ionic strength, oil volume fraction, and EC nanoparticle concentration under which HIPPEs with an internal phase volume fraction of 0.76 ± 0.04 are produced. Using EC nanoparticle-stabilized HIPPEs as a template, we then fabricate a hydrophobic/oleophilic polymeric porous material, which selectively absorbs oil, collects an oil spill from the surface of water, and breaks an O/W Pickering emulsion to its constituents.

中文翻译：

高内相拾取液作为纤维素功能性多孔材料的模板

与分子表面活性剂生成的乳液相比，由固体颗粒稳定的乳液（Pickering乳液）对聚结的耐受性更高。如果富集到分散相的体积分数至少为0.74，那么这些所谓的高内相Pickering乳液（HIPPE）可以作为模板用于制造各种功能性多孔材料。从乙基纤维素（EC）（一种源自丰富纤维素的无毒，食品级，生物相容性聚合物）开始，我们将展示球形EC纳米颗粒如何用于产生水包油（O / W）或油包水（W / O）不含表面活性剂的Pickering乳液。我们探索了产生内相体积分数为0.76±0.04的HIPPE的离子强度，油体积分数和EC纳米粒子浓度的条件。

更新日期：2020-02-24

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