Schulich Faculty of Chemistry Technion-Israel Institute of Technology

Aharon Loewenstein
Professor Emeritus

Post Doc: Cal Tech. 1958-1959
Columbia University 1959-1960

Ph.D.: Hebrew University, 1958

Room number: 314
Phone: +972-4-8293758
Fax: +972-4-8295703
chaharon@technion.ac.il


Research
The Physical Chemistry of Liquid Crystalline Systems

- Nuclear magnetic resonance of liquids and liquid crystals. Molecular
reorientations and other dynamic processes in liquids.
- Nuclear quadrupole coupling constants of deuterium, nitrogen, oxygen
and sulfur in small molecules.
- The phase diagrams of lyotropic and thermotropic liquid crystals. The
structure of liquid crystalline phases. Aliphatic chain and polar-head
dynamics in non-ionic liquid crystals. Carbohydrate liquid crystals.
alpha,omega-dicarboxylic acids lyotropic liquid crystals.
- The properties of the liquid crystalline and gel phases of poly- gamma-
benzyl-L-glutamate(PBLG) in different organic solvents.
- Application of PBLG-organic solvent liquid crystals to the observation of
chiral and prochiral enantiomers by NMR.
- The study of the liquid crystalline phases of organic dyes (e.g.
benzopurpurin in water) by NMR, X-rays, DSC and optical microscopy.

Selected publications
spacer A. Loewenstein, D. Igner, U. Zehavi, H. Zimmerman, A. Emerson, and G.R.
spacer Luckhurst, Deuterium NMR Studies of n-Alkyl-beta-D-Glucopyranosides
spacer Liquid Crystalline Sytems, Liquid Crystals, 7, 457 (1990).
spacer H. Gutman, A. Loewenstein, Z. Luz, R. Poupko, and H. Zimmermann, Head
spacer Group Ordering in the Lyomesophases of Dipotassium Hexadecanoate
spacer Water System Studied by 13C and 2H NMR, Liquid Crystals, 9, 607
spacer (1991).
spacer A. Loewenstein and D. Igner, Deuterium NMR Studies of n-Octyl alpha
spacer and beta-D-gLucopyranosides Liquid Crystalline Systems, Liquid Crystals,
spacer 10, 457 (1991).
spacer J.P. Bayle, J. Courtieu, E. Gabetty, A. Loewenstein, and J.M. Pechine,
spacer Chiral Recognition in a Polypeptide Lyotropic Liquid Crystal Through
spacer Deuterium NMR, New J. Chem., 16, 837 (1992).
spacer A. Loewenstein and D. Igner, Deuterium NMR Studies of n-octyl, n-nonyl,
spacer n-decyl-D-glucopyranoside Liquid Crystalline Systems, Liquid Crystals, 13,
spacer 531 (1993).
spacer A. Loewenstein and M. Brenman, Study of the Liquid Crystalline Phases of
spacer Benzopurpurin in Water, Liquid Crystals, 17, 499 (1994).
spacer A. Meddour, I. Canet, A. Loewenstein, J.M. Pechine and J. Courtieu,
spacer Observation of Enantiomers, Chiral by Virture of Isotopic Substitution,
spacer through Deuterium NMR in a Polypeptide Liquid Crystal, JACS,
spacer116, 9652 (1994).