QENS and NMR Investigation of Molecular DIF Fusion in the Nematic Phase of EBBA
作者:
M. Riccò,
M.P. Fontana,
B. Rosi,
C. Vignali,
M. Cavazza,
期刊:
Molecular Crystals and Liquid Crystals Science and Technology. Section A. Molecular Crystals and Liquid Crystals
(Taylor Available online 1992)
卷期:
Volume 212,
issue 1
页码: 139-153
ISSN:1058-725X
年代: 1992
DOI:10.1080/10587259208037254
出版商: Taylor & Francis Group
关键词: nematics;molecular diffusion;QUENS, NMR
数据来源: Taylor
摘要:
In this paper we present a combined Quasi Elastic Neutron Scattering and13C magnetic relaxation study of the molecular dynamics in the nematic phase of EBBA. Attention has been focused on the relatively rigid biphenylic core of the molecule. In both cases a global model dependent fit of the obtained data has been performed. We were able to separate the rotational and translational contributions to QENS. The translational broadening displays an anomalous behavior in the high Q region which has been discussed against different diffusional mechanisms. The values of the rotational diffusion around the long molecular axis has been extracted as a function of temperature and compared to those measured with13C magnetic relaxation of the orthophenylic carbons. Finally, the flexibility of the considered molecular fragment has been taken into account in interpreting the13C relaxation data.
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