Microscopic Characteristics of Janus Nanoparticle Prepared via Grafting-From Reaction at Immiscible Liquid Interface
The dynamic process of synthesizing Janus nanoparticle (JNP) at water/oil two-phase interface by grafting-from reaction is investigated via dissipative particle dynamics simulation. We find that the interfacial tension, the initial monomer concentration, and the reaction probability can greatly influence the microscopic characteristics of JNP structure. It is difficult to synthesize a symmetric JNP with equal volume ration between hydrophilic and hydrophobic parts by grafting-from method unless the physical chemical conditions in the two phases are strictly symmetric, and there is always a disordered domain on JNP at two immiscible solvent interface. Interestingly, for certain recipe for synthesizing JNPs with grafting-from method, the higher interfacial tension between the water and oil phases may enhance the degree of disorder of grafted chains. The asymmetric initial monomer concentration in solution and the reaction probability can be used to control the syntheses of asymmetric JNP.