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水/空气界面纳米颗粒单层膜流变特性的锥体压入法研究
Interfacial rheological study of silica nanoparticle monolayer by an indentation approach
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摘要: 本文提出了利用锥体压入法研究水/空气界面上SiO_2纳米颗粒单层膜流变特性的新方法.通过锥体的压入和上升使单层膜产生应变,实时测定锥体压入-上升循环过程中表面压的变化.实验表明,表面压的尖锐变化是由单层膜受到的拉伸应变导致的.表面压变化的幅度dΠ和弛豫时间τ显著依赖于颗粒在界面的吸附能,因而随颗粒润湿性而发生明显变化.d∏和τ分别与单层膜的弹性和黏性相关.这些结果表明,该方法有可能为深入研究纳米颗粒单层膜的流变性质提供新的途径.Abstract: 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.
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