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Article

Surfactant-Laden Janus Droplets with Tunable Morphologies and Enhanced Stability for Fabricating Lens-Shaped Polymeric Microparticles

by 1 and 2,*
1
Department of Mechanical Engineering, School of Engineering, Tokyo Institute of Technology, Tokyo 152-8550, Japan
2
Institute of Innovative Research, Tokyo Institute of Technology, Yokohama 226-8503, Japan
*
Author to whom correspondence should be addressed.
Micromachines 2021, 12(1), 29; https://doi.org/10.3390/mi12010029
Received: 30 November 2020 / Revised: 25 December 2020 / Accepted: 26 December 2020 / Published: 29 December 2020
Janus droplets can function as excellent templates for fabricating physically and chemically anisotropic particles. Here, we report new surfactant-laden Janus droplets with curvature controllability and enhanced stability against coalescence, suitable for fabricating shape-anisotropic polymer microparticles. Using a microfluidic flow-focusing device on a glass chip, nanoliter-sized biphasic droplets, comprising an acrylate monomer segment and a silicone-oil (SO) segment containing a surfactant, were produced in a co-flowing aqueous polyvinyl alcohol (PVA) solution. At equilibrium, the droplets formed a Janus geometry based on the minimization of interfacial energy, and each of the two Janus segments were uniform in size with coefficient-of-variation values below 3%. By varying the concentration of the surfactant in the SO phase, the curvature of the interface between the two lobes could be shifted among concave, planar, and convex shapes. In addition, the Janus droplets exhibited significantly improved stability against coalescence compared with previously reported Janus droplets carrying no surfactant that coalesced rapidly. Finally, via off-chip photopolymerization, concave-convex, planar-convex, and biconvex lens-shaped particles were fabricated. View Full-Text
Keywords: microfluidics; Janus droplet; surfactant; interfacial tension; stability; microlens microfluidics; Janus droplet; surfactant; interfacial tension; stability; microlens
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MDPI and ACS Style

Xu, S.; Nisisako, T. Surfactant-Laden Janus Droplets with Tunable Morphologies and Enhanced Stability for Fabricating Lens-Shaped Polymeric Microparticles. Micromachines 2021, 12, 29. https://doi.org/10.3390/mi12010029

AMA Style

Xu S, Nisisako T. Surfactant-Laden Janus Droplets with Tunable Morphologies and Enhanced Stability for Fabricating Lens-Shaped Polymeric Microparticles. Micromachines. 2021; 12(1):29. https://doi.org/10.3390/mi12010029

Chicago/Turabian Style

Xu, Siyuan, and Takasi Nisisako. 2021. "Surfactant-Laden Janus Droplets with Tunable Morphologies and Enhanced Stability for Fabricating Lens-Shaped Polymeric Microparticles" Micromachines 12, no. 1: 29. https://doi.org/10.3390/mi12010029

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