Interfacial rheological study of silica nanoparticle monolayer by an indentation approach
水/空气界面纳米颗粒单层膜流变特性的 锥体压入法研究

We propose a novel approach for the study of rheological properties of silica nanoparticle monolayers at the air-water interface. The layers are deformed by indenting and raising a titanium cone.The surface pressure variations in these down-up cycles are recorded and analysed.The oscillation amplitude of surface pressure dΠresults from the tensile deformation of the particle layer,dΠand the relaxation time are strongly dependent on the adsorption energy of particles at the interface,thereby significantly changing the particle hydrophobicity.The results provide a deeper insight into the viscoelastic behaviour of particle layer,suggesting that the proposed method can be utilized for the rheological study of the layers of this kind.