Self-Propelled Supracolloidal Fibers from Multifunctional Polymer Surfactants and Droplets

Macromolecular Rapid Communications
Jing ZhaoTodd Emrick

Abstract

Advanced synthetic materials are needed to produce nano- and mesoscale structures that function autonomously, catalyze reactions, and convert chemical energy into motion. This paper describes supracolloidal fiber-like structures that are composed of self-adhering, or "sticky," oil-in-water emulsion droplets. Polymer zwitterion surfactants serve as the key interfacial components of these materials, enabling multiple functions simultaneously, including acting as droplet-stabilizing surfactants, interdroplet adhesives, and building blocks of the fibers. This fiber motion, a surprising additional feature of these supracolloidal structures, is observed at the air-water interface and hinged on the chemistry of the polymer surfactant. The origin of this motion is hypothesized to involve transport of polymer from the oil-water interface to the air-water interface, which generates a Marangoni (interfacial) stress. Harnessing this fiber motion with functional polymer surfactants, and selection of the oil phase, produced worm-like objects capable of rotation, oscillation, and/or response to external fields. Overall, these supracolloidal fibers fill a design gap between self-propelled nano/microscale particles and macroscale motors, and ha...Continue Reading

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Citations

Apr 2, 2021·Journal of the American Chemical Society·Jing ZhaoTodd Emrick
Sep 3, 2021·The Journal of Physical Chemistry. B·Boris KichatovAlexey Kiverin

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