Homeotropic and planar structures in liquid-crystalline polymer brushes |
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| Affiliation: | 3. Faculty of Advanced Basic Science, Galala Univeristy, Suez, Egypt;1. Center for Biomaterials, Biomedical Research Institute, Korea Institute of Science and Technology, Seoul 02792, Republic of Korea;2. Program in Nanoscience and Technology, Graduate School of Convergence Science and Technology, Seoul National University, Seoul 08826, Republic of Korea;3. Department of Orthopedic Surgery, College of Medicine, Korea University, Seoul 02841, Republic of Korea;4. NBIT, KU-KIST Graduate School of Converging Science and Technology, Korea University, Seoul 02841, Republic of Korea;5. Department of Applied Bioengineering, Graduate School of Convergence Science and Technology, Seoul National University, Seoul 08826, Republic of Korea;6. Research Institute for Convergence Science, Seoul National University, Seoul 08826, Republic of Korea;7. School of Electrical and Electronic Engineering, YU-KIST Institute, Yonsei University, Seoul 03722, Republic of Korea |
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| Abstract: | The ordering in polymer brushes formed by macromolecules with mesogenic groups in the main chain is investigated. The numerical method of self-consistent field approximation was used. The existence of two different liquid crystalline nematic states is shown: homeotropic (HLC) and planar (PLC) states. The free energy of the HLC state is always less than that of the PLC state. However, with the increase of energy of anisotropic interactions, (with decrease in temperature) our numerical procedure leads us to either one or another state depending on the grafting density. The results obtained show that both brush surfaces, play an essential role in establishing the concrete LC state structure. The grafting surface and the external surface force the planar order. |
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