Emulsion Interfacial Synthesis of Asymmetric Janus Particles

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 crosslinking 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.