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NMR spectra of mixed liquid crystals of opposite diamagnetic susceptibility anisotropies near critical point under variable angle sample spinning

Vivekanandan, S and Deepak, Vinay HS and Gowda, Nagana GA and Ramanathan, KV and Khetrapal, CL (2002) NMR spectra of mixed liquid crystals of opposite diamagnetic susceptibility anisotropies near critical point under variable angle sample spinning. In: Journal of Molecular Structure, 602-60 . pp. 485-489.

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Abstract

The deuterium NMR spectra of molecules oriented in mixtures of nematic liquid crystalline phases for which the macroscopic diamagnetic susceptibility anisotropy (Δχ) is nearly zero reveal the dynamics of the director for different angles the spinning axis makes with the magnetic field and for different spinning speeds. It is observed that a switch over of the director orientation occurs as a function of the spinning speed and the angle the spinning axis makes with the magnetic field. The farther the angle between the spinning axis and the magnetic field from the magic angle, the higher the spinning speed required to effect such a switch over of the director orientation. The switch over takes place gradually as indicated by the appearance of the ‘powder pattern’ in the 2H NMR spectra.

Item Type: Journal Article
Additional Information: Copyright of this article belongs to Elsevier.
Keywords: Deuterium NMR;Liquid crystals;Variable angle spinning; Magic angle spinning;Critical mixture
Department/Centre: Division of Chemical Sciences > Sophisticated Instruments Facility
Division of Physical & Mathematical Sciences > Physics
Date Deposited: 09 Jun 2006
Last Modified: 19 Sep 2010 04:29
URI: http://eprints.iisc.ernet.in/id/eprint/7491

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