Capillary and van der Waals forces between uncharged colloidal particles linked by a liquid bridge |
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Authors: | David Megias-Alguacil Ludwig J Gauckler |
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Institution: | 1. Non-Metallic Inorganic Materials, Department of Materials, ETH-Zürich, 8093, Zürich, Switzerland
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Abstract: | This work presents a theoretical study of the forces established between colloidal particles connected by means of a concave
liquid bridge, where the solid particles are partially wetted by a certain amount of liquid also possessing a dry portion
of their surfaces. In our analysis, we adopt a two-particle model assuming that the solids are spherical and with the same
sizes and properties and that the liquid meniscus features an arc-of-circumference contour. The forces considered are the
typical capillary ones, namely, wetting and Laplace forces, as well as the van der Waals force, assuming the particles uncharged.
We analyze different parameters which govern the liquid bridge: interparticle separation, wetting angle, and liquid volume,
which later determine the value of the forces. Due to the dual characteristic of the particles' surfaces, wet and dry, the
forces are to be determined numerically in each case. The results indicate that the capillary forces are dominant in most
of the situations meanwhile the van der Waals force is noticeable at very short distances between the particles. |
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