Synthesis of Janus particles by size through interfacial tension adjustment
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A Janus particle is a particle in which two phases with different physical and chemical properties are separated in one particle. Using this anisotropy, Janus particles can be used as drug delivery media and functional surfactants. However, Janus particles with well-controlled sizes are difficult to synthesize and the process is complicated. In this study, size-specific Janus particles were synthesized through phase separation using seed swelling polymerization and photopolymerization. First, poly(styrene-co-vinyl alcohol) hydrophilic seed particles of various sizes were synthesized. After swelling with a mixture containing a hydrophobic alkyl acrylate monomer and a photoinitiator, Janus particles were synthesized by UV irradiation. In this study, Janus particles of different sizes were obtained by controlling the interfacial tension by adjusting the molecular weight of alkyl acrylate and the mixing ratio of ethanol/water.