Abstract
The molecular stacking of a hexaazatrinaphtalene-based discogen sandwiched between two flat glass substrates has been studied. The surface free energy of the substrates was found to significantly influence the way the discotic molecules anchor on the surface. The surface free energy of the substrates was changed by means of O2 plasma buffing. The discotic molecules tend to anchor with their disc-face toward the substrates with high surface free energy, and the other molecules stack on to form the homeotropically aligned columnar phase. A decrease in the surface free energy of the substrate leads to the discotic columns tilting away from the normal to the substrate.
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