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In our study we investigate the behaviour of the net force (NF) emergingbetween an ellipsoidal particle and a thick plate (slab), when the interactiontakes place in a near critical fluid medium with account for the omnipresentvan der Waals forces (vdWF). Here we consider the case of complete wetting ofthe objects surfaces by the medium, due to strong adsorbing local surfacepotentials, exerted by thin solid coating films. The influence of the bulkinner regions of the particle and the slab on the constituents of the fluidresults in long-ranged competing dispersion potentials. As a consequence fromthe critical fluctuations of the medium, the system experiences an additionaleffective interaction, traditionally termed critical Casimir force (CCF). Theforces of interest are evaluated numerically from integral expressions obtainedutilizing general scaling arguments and mean-field type calculations incombination with the so-called "surface integration approach" (SIA). Within thescenario considered here, this technique is applicable if one has knowledge ofthe forces between two parallel semi-infinite plates, confining in between somefluctuating fluid medium characterized by its temperature $T$ and chemicalpotential $\mu$. It is demonstrated that for a suitable set of particle-fluid,slab-fluid, and fluid-fluid coupling parameters the competition between theeffects due to the coatings and the core regions of the objects result, whenone changes $T$ or $\mu$, in {\it sign change} of the NF acting between theellipsoid and the slab.

Fluctuation-Induced Interactions Between Ellipsoidal Particle and Planar Substrate Immersed in Critical Medium