Pulsed NMR study of molecular dynamics in liquid crystal 40.7

Ravindranath, G.; Venu, K.; Sastry, V. S. S.

doi:10.1016/0301-0104(90)87010-9

Cited by 4 publications

(1 citation statement)

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“…Though the collective fluctuations that liquid crystal exhibits, belonging to nO.m series was studied earlier using the NMR technique [3][4][5][6][7][8][9], very little information could be obtained about the detailed reorientational components associated with the different parts of the molecules. The interest here is to study the faster molecular motions in the mesomorphic phases and the change involved, if any, on going from one mesophase to the other.…”

Section: Introductionmentioning

confidence: 99%

Molecular reorientations in liquid crystals pentyloxybenzylidine hexylanilene (PBHA) and butyloxybenzylidine octylanilene (BBOA)

Mitra

Venu²,

Tsukushi³

et al. 2004

Phys. Rev. E

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Molecular reorientational motions in undeuterated pentyloxybenzylidine hexylanilene (PBHA or 5O.6) and butyloxybenzylidine octylanilene (BBOA or 4O.8) as studied by the quasielastic neutron scattering (QENS) technique in their different mesophases are reported. Models are built up in stages to account for the experimental elastic incoherent structure factor (EISF). It is found that there exist simultaneous reorientational motions of the chain group and the reorientational motions of the whole molecule around its molecular axis in the smectic- G, smectic- B, and smectic- C phases. In smectic- A and nematic phases, additional body axis fluctuations are found to exist in both 5O.6 and 4O.8 systems. The average amplitude of body axis fluctuations is found to be approximately 15 degrees and 25 degrees, respectively, in the smectic- A and nematic phases of 5O.6, and approximately 14 degrees and 29 degrees, respectively, in 4O.8.

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