One-Step Production of Highly Anisotropic Particles via a Microfluidic Method
Ming Xia, Eun Min Go, Khu Hwan Choi, Jin Hyun Lim, Bumkyo Park, Taekyung Yu, Sang Hyuk Im, Sang Kyu Kwak, Bum Jun Park
Index: 10.1016/j.jiec.2018.03.033
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Abstract
We introduce a promising protocol that can be used to fabricate polymer particles with a high degree of shape anisotropy; this method can be utilized with a variety of microfluidic generation methods Low-density microparticles and high-density nanoparticles vertically migrated in a polymer solution confined in emulsion droplets that were produced via a microfluidic method. As the solvent evaporated in individual droplets at ambient conditions, the low-density microparticles migrated upward because their density was lower than that of the polymer solution. The high-density nanoparticles that were initially well-dispersed in the droplet phase became destabilized upon solvent removal, leading to the formation of aggregates and sedimentation in a downward direction. The migration of the particle components during solvent evaporation induced shape deformation/modification of the emulsion droplets; consequently, polymer particles with highly anisotropic shapes were created after drying.