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本文采用两个互相垂直的Wilhelmy片对不同润湿性的SiO2纳米颗粒单层膜的表面压和黏弹性进行了研究,并利用Brewster角显微镜(BAM)对单层膜的形貌演变进行了观测.实验发现,当水面完全被颗粒覆盖时,单层膜的表面压具有明显的各向异性,中等润湿性(34% SiOH)的颗粒膜其表面压各向异性最大.压缩模量E和剪切模量G均在中等润湿性时出现最大值.这些结果表明,单层膜的流变性能与泡沫的稳定性密切相关.疏水性最强(20%SiOH)的颗粒膜具有形状记忆效应,这可能是纳米颗粒在受压过程中发生了不可逆聚集以及单层膜内应力驱使纳米颗粒进行位置调整造成的.
In this paper, the surface pressure and viscoelasticity of two different monolayers of SiO2 nanoparticles with different wettability were studied by using two Wilhelmy sheets perpendicular to each other. The morphological evolution of monolayers was observed by Brewster angle microscope (BAM) The experimental results show that when the water surface is completely covered by particles, the surface pressure of the monolayer film has obvious anisotropy, and the surface pressure anisotropy of the film with medium wettability (34% SiOH) is the largest.The compressive modulus E and The results showed that the rheological properties of the monolayer films are closely related to the stability of the foam.The most hydrophobic (20% SiOH) granular films have the shape memory This may be due to the irreversible aggregation of the nanoparticles during the compression process and the internal stress of the monolayer to drive the nanoparticle to adjust its position.