20.500.12556/RUL-168550 Smectic order-driven total wall defect formation We study experimentally and theoretically liquid crystal structure of smectic oily streaks, focusing on planar wall defects hosted within smectic flattened hemicylinders (SFHs). The wall configuration is singular both in orientational and translational order and we refer to it as the Total Wall Defect (TWD). Here “singular” refers to nematic director field and smectic phase field. In theoretical analysis of the TWD we use a mesoscopic Landau-de Gennes-Ginsburg approach in terms of the nematic tensor order parameter and smectic A (SmA) complex order parameter field. The smectic layer structure is experimentally determined using polarizing optical microscopy and X-ray diffraction measurements at Synchrotron facilities. We demonstrate theoretically and numerically that the experimentally observed abrupt change of the SmA layering in the centre of the wall defect is realized via nematic order reconstruction mechanism. Our experiments reveal that smectic layer spacing above and below the wall are almost similar. The theoretical analysis suggests that lateral SFH boundary conditions determine the vertical position of TWD. liquid crystals smectic oily streaks total wall defects orientational order translational order Landau-de Gennes-Ginsburg approach order reconstruction mechanism tekoči kristali smektične oljne proge totalni linijski defekti orientacijski red translacijski red Landau-de Gennes-Ginsburg pristop mehanizem rekonstrukcije orientacijskega reda true false true Angleški jezik Slovenski jezik Članek v reviji 2025-04-16 14:03:47 2025-04-16 14:03:52 2025-04-18 14:21:55 0000-00-00 00:00:00 2025 0 0 11 str. art. 106294 Vol. 63 15. Apr. 2025 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 532.783 2468-0230 10.1016/j.surfin.2025.106294 233000451 1-s2.0-S246802302500553X-main.pdf 1-s2.0-S246802302500553X-main.pdf 1 E31ED6936D77C917B2915CDB324FB792 b441e22eb16eecfd5a471bfcba5f242c3a1e3647c896f0ce863cd90ca70622d9 047f686c-1aba-11f0-b232-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=208419 https://www.sciencedirect.com/science/article/pii/S246802302500553X 0 bd41872d-1ab9-11f0-b232-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=208230 Fakulteta za elektrotehniko 0 0 0