Abstract
The unretarded van der Waals interaction has been studied for a model system in which a spherical colloid is placed eccentrically in a spherical cavity of colloidal dimension. The proposed model simulates systems such as colloidal particles entrapped in near-spherical cavities found in porous media, particles in concentrated suspensions, and macromolecules encapsulated in reverse micelles and liposomes. An analytical expression, which describes the particle-cavity wall interaction energy as a function of the particle and cavity radii and the radial configuration of the particle inside the cavity, has been derived. The analysis is further extended to reveal how an adsorbed layer on the cavity wall may affect the particle-cavity wall van der Waals interaction.
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