1H Multiple-Pulse Solid-State NMR Investigations of Electrically Oriented Liquid Crystals

Holstein, Peter; Lopes, Ana C. D.; Rauchfuss, J.; Geschke, D.

doi:10.1002/(sici)1097-458x(199706)35:6<420::aid-omr105>3.0.co;2-w

Cited by 7 publications

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“…The electric field acts inside a capacitor cell filled with the LC under investigation. [13][14][15] The capacitor is placed in the NMR coil of a static probe and connected to a high voltage supply. These experiments do not require any modifications to the NMR spectrometer and can be carried out with commercial probes.…”

Section: Introductionmentioning

confidence: 99%

Electrically induced dynamic processes in nematic liquid crystals: H1 nuclear magnetic resonance investigations

Bender

Holstein

Geschke

2000

The Journal of Chemical Physics

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The director reorientation of some nematic liquid crystals in the presence of both magnetic and electric field is described by a modified from of the Leslie equation. Proton nuclear magnetic resonance experiments observing static director orientations in different angles between the director and the magnetic field are described together with reorientation experiments driven by various electric fields. A new technique to measure ⌬/⌬⑀ is presented which gives direct access to the anisotropies without any influence of elastic properties. Using electric fields of different strength and in different angles with respect to the magnetic field the dynamic processes in liquid crystals can be investigated in a very flexible way. A number of experiments investigating the homogeneous director reorientation in the electric field is presented. As one result the rotational viscosity was determined. As a surprising result we found a homogeneous reorientation in the electric field and an inhomogeneous reorientation back in the magnetic field even though the initial angles between the director and the external field were the same.

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Section: Introductionmentioning

confidence: 99%