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Surface Anchoring Energy and Ions Adsorption: Experimental Analysis

The Freedericksz transition technique has been used to measure the surface anchoring energy of the interface nematic liquid crystal/solid substrate as a function of the sample thickness, for different liquid crystals and surface treatments. Our results can be interpreted on the basis of an adsorption model, recently proposed. The experimental data show that, in the limit of very thin samples, the measured anchoring energy strongly depends on the surface treatment. On the other hand, for very thick samples, the anchoring energy seems to be practically independent of the nature of the surface layer.