Observation of echoes in reorientation processes of nematic liquid crystals

Bender, Michael L.; Holstein, Peter; Geschke, D.

doi:10.1016/s1090-7807(03)00189-7

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Dynamic Nmr Studies1

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2011

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“…[39][40][41] Observation of echoes in the reorientation processes of nematic liquid crystals under the action of an electric field, studied by 1 H NMR spectroscopy has been reported. 42 The separation between the corresponding sidebands is up to two orders of magnitude higher than that would be expected in a magic angle spinning (MAS) experiment. This behavior has been understood in analogy to MAS by a time-dependent dipolar Hamiltonian in which the homogeneous sample rotation of the MAS experiment is replaced by a more complex term which describes the director reorientation.…”

Section: Dynamic Nmr Studiesmentioning

confidence: 86%

Oriented molecules

Khetrapal¹,

Ramanathan²

1998

Nuclear Magnetic Resonance

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Section: Dynamic Nmr Studiesmentioning

confidence: 86%

Oriented molecules

Khetrapal¹,

Ramanathan²

1998

Nuclear Magnetic Resonance

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Field-induced alignment of the nematic director: Studies of nuclear magnetic resonance spectral oscillations in the limit of fast director rotation

Kantola

Luckhurst

Sugimura

et al. 2011

The Journal of Chemical Physics

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Time-resolved NMR spectroscopy is a powerful method to investigate field-induced rotation of the director in a nematic liquid crystal. The method requires that the director does not rotate significantly during the acquisition of the free induction decay and hence the NMR spectrum. We have extended the method to systems where this is not the case and the observed NMR spectra are now found to contain novel oscillatory features. To understand these oscillations, we have developed a model combining both director and spin dynamics. In addition to increasing the information content of the time-resolved NMR spectra, it also proves possible to determine the field-induced relaxation time from a single spectrum.

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Observation of echoes in reorientation processes of nematic liquid crystals

Cited by 2 publications

References 13 publications

Oriented molecules

Oriented molecules

Field-induced alignment of the nematic director: Studies of nuclear magnetic resonance spectral oscillations in the limit of fast director rotation

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