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We study the behavior of the critical Casimir force and its interplay withthe van der Waals force acting between two parallel slabs separated at adistance $L$ from each other confining a non-polar simple fluid or a binaryliquid mixture. The surfaces of the slabs are coated by thin layers exertingstrong preference to the liquid phase of the fluid, or one of the components ofthe mixture. The slabs influence the fluid by long-range competing dispersionpotentials. Under such conditions one usually expects {\it attractive} Casimirforce governed by universal scaling function to which the dispersion potentialsprovide only corrections to scaling. We demonstrate, however, that below agiven $L<L_{\rm crit}$ the competition between the effects due to the coatingsand the slabs can result in {\it sign change} of the Casimir force when onechanges the temperature $T$, the chemical potential of the fluid $\mu$, or $L$.The last implies that by choosing specific materials for the slabs, coatingsand the fluid for $L \lesssim L_{\rm crit}$ one can realize {\it repulsive}Casimir force with {\it non-universal} behavior which, upon increasing $L$,gradually turns into an {\it attractive} one described by an {\it universal}scaling function for $L\gg L_{\rm crit}$. We presented arguments and relevantdata for specific substances in support of the experimental feasibility of thepredicted behavior of the force.

physical review. e, statistical, nonlinear and soft matter physics

Critical and near critical phase behaviour and interplay between the  thermodynamic Casimir and van der Waals forces in confined non-polar fluid  medium with competing surface and substrate potentials