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 the contact angle During the series of experiments, the influence of surfactants as part of the electrorheological liquids on the value of the contact angle and the rate of spreading of the electrorheological‐liquid droplet on the substrate has been evaluated. The contribution of each of these parameters and their interactions, in terms of a relative power, to the contact angle, surface tension, and driving force for wetting were determined. We use electrocapillarity in order to change the contact angle of a transparent drop, thus realizing a lens of variable focal length (B. The influence of the contact angle at glass walls on shapes of crystals and of inclusions is discussed. If the contact angle $\theta$ exceeds a threshold value $\theta_b$ the liquid exists in a blob-like configuration. The transition between these two regimes arises when the variations of contact angle exceed the contact angle hysteresis. For this purpose, we have investigated the contact angle hysteresis behaviour of six different wetting and non-wetting fluids with surface tensions varying from 25 to 72mN m^-1. The simulation also allows an estimation of the contact angle variation on both sides of the drop. The effect of topography of the surface on the contact angle hysteresis was investigated. Our results clearly indicate that the superhydrophobicity of a surface cannot be judged by the contact angle alone. The contact angle at the line connecting the three films is extracted by image analysis of the bubbles profiles. The visco-elastic adhesion properties of the bubbles are further explored by measuring the deviation Δθd(t) of the contact angle from the static value as the distance between the two bubbles supports is sinusoidally modulated. On hydrophobic surfaces, the contact angle for nanodroplets depends strongly on the root-mean-square roughness amplitude, but it is nearly independent of the fractal dimension of the surface. The hydrophobic nature of silicone-treated flakes was evaluated by measuring the contact angle and the rate of water absorption (WA) on the surface of the wood flake. As a result the contact angle of an applied water droplet increased significantly. The contact angle hysteresis phenomenon and the modelling of experimentally well-known results expressing the dependence of the apparent dynamic contact angle on the celerity of the line are obtained. Necessary and sufficient conditions for stability, as the contact angle tends to zero, are formulated in terms of the Jacobi accessory differential equations. For a large class of 1+1 dimensional interfaces of the Solid-On-Solid type we prove on a microscopic basis the validity of the Wulff construction and of the generalized Young equation which gives the contact angle of a sessile drop on a wall. Deviations from the ideal behaviour are due to the influence of the contact angle and the inhomogeneity of the porous medium. For practical systems the contact angle is (i) usually different from zero, (ii) very often changing with time, (iii) occasionally varying over different parts of the porous medium.

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2008 CNKI－中国知网

2008中国知网(cnki) 中国学术期刊(光盘版)电子杂志社