Ligia Frunza1a, Irina Zgura1b, Constantin Paul Ganea1c, Doina Manaila-Maximean2
Abstract. Oxide nanopowdered materials obtained in our lab were reviewed: aerosils, molecular sieves, tin oxide, mixed oxides, some of them having semiconductor properties. Liquid crystals were confined in one, two or three dimensions of these materials, when special interactions were involved. Investigations by (broadband) dielectric spectroscopy of confined molecules have shown a relaxation process which is slower than those belonging to the bulk molecules. In addition, the temperature dependence of the corresponding relaxation time does not change at the phase transition temperatures in the bulk liquid crystals. We applied IR spectroscopy for studying structure and surface interactions and we employed novel complementary measurements and theoretical techniques to explore the low frequency intramolecular dynamics of model molecules in constrained structures. Here we discussed IR spectroscopy data for studying the structure and interactions in the surface layer.
Keywords: Nematic liquid crystals, confinement, nanopowdered oxide materials, dielectric spectroscopy, infrared spectra
DOI 10.56082/annalsarsciphyschem.2025.1.59
1 a) Senior researcher 1st. deg., b) Senior researcher 1st. deg., c) Senior researcher 3rd deg., National Institute of Materials Physics, 405A Atomistilor str., 077125 Magurele, Romania, (a) ligia.frunza@gmail.com, b) irina.zgura@infim.ro, c) paul_ganea@yahoo.com).
2 Prof. Dr. habil., National University of Science and Technology Politehnica Bucharest, Department of Physics, 313 Spl. Independentei, 060042 Bucharest; corresponding member of the Academy of Romanian Scientists, 3 Ilfov str., 050044 Bucharest, Romania, (doina.manaila@upb.ro).
PUBLISHED in Annals of the Academy of Romanian Scientists Series on Physics and Chemistry, Volume 10, No1