To explore the dynamic adsorption process of nanoparticles at oil-water interface on the interfacial tension,a physical model of nanoparticle adsorption at oil-water interface was established by using the dissipative particle dynamics simulation method,and the adsorption kinetic process of a single particle and the mechanism of multi-particle interaction on the interfacial tension were investigated.The results show that the adsorption of a single particle is divided into three stages,namely the free diffusion stage,the interfacial adsorption stage,and the dynamic equilibrium stage.The free energy change of particle adsorption is calculated by using umbrella sampling,which reveals that particle adsorption is spontaneous and rapid,and the particle can be stabilized at the interface after adsorption.The interaction force between the particles decreases with the increase of the distance between particles,which is due to the solvation effect of the solvent particles between the particles.The interfacial tension increases when the interaction of particles is attractive,and the interfacial tension conversely decreases when the interaction of particles is repulsive.
oil-water interfacenanoparticleinterfacial tensionadsorptionfree energy
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