Preparation of Janus Particles with Different Stabilizers and Formation of One-Dimensional Particle Arrays

Abstract

Janus particles with two hemispheres having different stabilizers, a polystyrene (PS) phase stabilized by poly(acrylic acid) (PAA) (PS(PAA)) and a poly(methyl methacrylate) (PMMA) phase stabilized by poly(vinylpyrrolidone) (PVP) (PMMA(PVP)), were synthesized by the solvent-absorbing/releasing method of PS(PAA)/PMMA(PVP) composite particles with a core-shell structure. The PS(PAA)/PMMA(PVP) composite particles were prepared by seeded dispersion polymerization of MMA using PVP as stabilizer in the presence of PS seed particles stabilized by PAA. We also demonstrated the facile formation of the colloidal chains via hydrogen bonding interaction between different stabilizers.

Synthesis of Monodisperse Bi‐Compartmentalized Amphiphilic Janus Microparticles for Tailored Assembly at the Oil–Water Interface

“…More specifically, we patched silica NPs on one of the bulb surfaces of the Janus microparticles, thus enabling fabrication of amphiphilic Janus microparticles (Figure A). It is well known that the PS particles produced by dispersion polymerization are sterically stabilized by PVP that has been covalently grafted onto the primary particles . In our study, the presence of PVP on the PS particles could be confirmed by XPS analysis (Figure B).…”

Synthesis of Monodisperse Bi‐Compartmentalized Amphiphilic Janus Microparticles for Tailored Assembly at the Oil–Water Interface

“…It is well known that the PS particles produced by dispersion polymer-ization are sterically stabilized by PVP that has been covalently grafted onto the primary particles. [25] In our study,t he presence of PVP on the PS particles could be confirmed by XPS analysis ( Figure 4B). Therefore,t he silica NPs could patch on the PS compartment through hydrogen bonding with PVP,a llowing us to produce amphiphilic Janus particles ( Figure 4C,D).…”

A Surfactant-Free and Shape-Controlled Synthesis of Nonspherical Janus Particles with Thermally Tunable Amphiphilicity

“…At the interfaces, they sometimes show catalytic activity for chemical reactions or phase transfer processes in complex fluids . Janus particles are also being considered for use in biomedicine and optoelectronics, as well as for fabricating various assembly structures and antireflectivity surfaces …”