重層液膜界面の粒子によるはじき核成長の抑制

抄録

The effect of particle addition on the de-wetting at a liquid/liquid interface was observed by optical microscopy. Evaporative organic solvent film was coated on an immiscible silicone oil to form two-layer thin liquid coatings. As the solvent evaporates, the solvent film became thinner, spontaneously ruptured and promoted the de-wetting at the solvent/oil interface. The spherical silica particles with a diameter of 5.4 microns were dispersed in the upper solvent layer at a particular range of particle concentrations. The experimental results revealed that the onset time of de-wetting significantly increases as increasing particle concentrations in the upper liquid layer, i.e., the liquid layer was stabilized by the particle addition. In contrast to the suppressed de-wetting in a single dispersion layer (Barnes, 2000), the suppression in our two liquid layers was induced by slower growth of fluctuation at the liquid/liquid interface, rather than the meniscus self-pinning at particle/liquid/solid interface.