Another face to Janus particles: Silica Janus nanosheets were synthesized by crushing Janus hollow spheres formed by self‐assembled materialization of an amphiphilic emulsion interface. The Janus nanosheets serve as solid surfactants and can be used collecting oil or hazardous chemical spills.
We have proposed a simple method to synthesize asymmetric Janus polymer particles at an emulsion interface. Morphological evolution of the particles with polymerization and their dependence on some key variables reveal that both cross-linking degree of the particles and interfacial tension difference play key roles in achieving the asymmetric shapes. By selective growth of functional materials onto the desired sides, composition and microstructure of the Janus particles can be controlled. The representative PS/PAM Janus particles are amphiphilic and can be used as solid surfactants to stabilize emulsions, which preferentially orientate at the interface.
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