Reconfigurable Microfluidic Droplets Stabilized by Nanoparticle Surfactants,ACS Nano

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Reconfigurable Microfluidic Droplets Stabilized by Nanoparticle Surfactants
ACS Nano ( IF 15.8 ) Pub Date : 2018-03-06 00:00:00 , DOI: 10.1021/acsnano.7b07635
Anju Toor ₁ , Sean Lamb ₂ , Brett A. Helms _{1,

3} , Thomas P. Russell _{1,

4,

5}

Affiliation

Interfacial assemblies of nanoparticles can stabilize liquid–liquid interfaces. Due to the interactions between functional groups on nanoparticles dispersed in one liquid and polymers having complementary end-functionality dissolved in a second immiscible fluid, the anchoring of a well-defined number of polymer chains onto the nanoparticles leads to the formation of NP–surfactants that assemble at the interface and reduce the interfacial energy. We have developed droplet interfaces covered with elastic, responsive monolayers of NP–surfactants. Due to the presence of an elastic layer at the interface, the droplets offer a greater resistance to coalescence and can prevent the exchange of materials across interfaces. Our results show the successful encapsulation of nanoparticles, dyes, and proteins with diameters in the 2.4–30 nm range. Further, we show that stable water-in-oil droplets can be generated for various combinations of polymer ligands and nanoparticles bearing complementary functionalities. These NP–surfactant-stabilized microfluidic emulsions would enable applications requiring liquid–liquid interfaces that can adapt and respond to external stimuli and whose mechanical properties can be easily tailored.

中文翻译：

纳米表面活性剂稳定的可重构微流体液滴

纳米粒子的界面组装可以稳定液-液界面。由于分散在一种液体中的纳米颗粒上的官能团与溶解在第二种不混溶流体中的具有互补末端官能团的聚合物之间的相互作用，将确定数量的聚合物链锚定到纳米颗粒上会导致NP表面活性剂的形成。在界面处组装并减少界面能。我们已经开发出了覆盖有弹性，反应灵敏的NP-表面活性剂单层的液滴界面。由于在界面处存在弹性层，因此液滴可提供更大的聚结阻力，并可以防止材料在界面之间交换。我们的结果表明，成功封装了直径在2.4–30 nm范围内的纳米粒子，染料和蛋白质。进一步，我们显示出，稳定的油包水小滴可产生用于聚合物配体和具有互补功能的纳米粒子的各种组合。这些NP-表面活性剂稳定的微流体乳液将使需要液-液界面的应用能够适应和响应外部刺激，并且可以轻松调整其机械性能。

更新日期：2018-03-06

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