Controlled Movement of Complex Double Emulsions via Interfacially Confined Magnetic Nanoparticles.,ACS Central Science

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Controlled Movement of Complex Double Emulsions via Interfacially Confined Magnetic Nanoparticles.
ACS Central Science ( IF 12.7 ) Pub Date : 2020-07-02 , DOI: 10.1021/acscentsci.0c00686
Cassandra A Zentner ₁ , Alberto Concellón ₁ , Timothy M Swager ₁

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Controlled, dynamic movement of materials through noncontacting forces provides interesting opportunities in systems design. Confinement of magnetic nanoparticles to the interfaces of double emulsions introduces exceptional control of double emulsion movement. We report the selective magnetic functionalization of emulsions by the in situ selective reactions of amine-functionalized magnetic nanoparticles and oil-soluble aldehydes at only one of the double emulsion’s interfaces. We demonstrate morphology-dependent macroscopic ferromagnetic behavior of emulsions induced by the interfacial confinement of the magnetic nanoparticles. The attraction and repulsion of the emulsions to applied magnetic fields results in controlled orientation changes and rotational movement. Furthermore, incorporation of liquid crystals into the double emulsions adds additional templating capabilities for precision assembly of magnetic nanoparticles, both along the interface and at point defects. Applying a magnetic field to liquid crystal complex emulsions can produce movement as well as reorganization of the director field in the droplets. The combination of interfacial chemistry and precise assembly of magnetic particles creates new systems with potentially useful field-responsive properties.

中文翻译：

通过界面受限的磁性纳米粒子控制复杂的双乳状液的运动。

通过非接触力控制材料的动态运动为系统设计提供了有趣的机会。将磁性纳米颗粒限制在双乳化液的界面中，可实现对双乳化液运动的出色控制。我们通过原位报道了乳剂的选择性磁功能化胺官能化的磁性纳米粒子与油溶性醛仅在双乳化液的界面之一发生选择性反应。我们证明了由磁性纳米粒子的界面约束引起的乳液的形态学依赖的宏观铁磁行为。乳剂对施加的磁场的吸引和排斥导致受控的取向变化和旋转运动。此外，将液晶结合到双乳剂中为沿界面和点缺陷的磁性纳米粒子的精确组装增加了附加的模板能力。向液晶复合乳剂施加磁场可产生运动以及液滴中指向矢场的重组。

更新日期：2020-08-26

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