Abstract
Stearic acid crystals grew with different types of orientation on various substrates. The molecules lie parallel to the substrates (P-orientation) or stand normal to those (N-orientation). The proportion of P-orientation in the thin film decreases with increasing substrate temperature and also with decreasing deposition rates. Energy calculations have been carried out in order to describe the growth mechanism of the stearic acid on a KCl surface. The net charge distribution in the molecule is presented. The total potential energy, as well as the Coulomb and Lennard-Jones 6–12 potential contributions have been calculated for a single molecule with different orientations. It was clarified that the potential energy became minimal when the molecule was parallel to the substrate. The growth mechanism is discussed on the basis of the calculated potential energy.
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