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- W2022271952 abstract "Abstract We present a comparative study of the molecular dynamics in the smectic A phase (SmA) of two poly-(amidoamine) (PAMAM) liquid crystalline dendrimers of generation 1 and 3, respectively, using proton (1H) spin-lattice relaxation time dispersion. The dispersions are interpreted using two main relaxation mechanisms associated with collective motions and fast reorientational movements of the dendritic segments in the low and high frequency ranges, respectively. Our results can be interpreted on the basis of a decrease in the size of the coherent smectic domains that experience layer undulations compared to what is found in low molar mass liquid crystals, as a consequence of disorder induced by the dendritic core. At high frequency, the relaxation results reveal that the reorientational motions of the mesogenic units are conditioned by their covalent links with the dendritic core. Keywords: molecular dynamicsnuclear magnetic resonancesmectic A phase Acknowledgments A. Van-Quynh and C. Cruz wish to thank J. Figueirinhas and J. Barberá for helpful discussions. The technical assistance of D. Sousa and J. Cascais and G. Feio is also acknowledged." @default.
- W2022271952 created "2016-06-24" @default.
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- W2022271952 date "2006-07-01" @default.
- W2022271952 modified "2023-10-03" @default.
- W2022271952 title "NMR Relaxation Study of Molecular Dynamics in the Smectic A Phase of PAMAM Liquid Crystalline Dendrimers of Generation 1 and 3" @default.
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- W2022271952 doi "https://doi.org/10.1080/15421400600588363" @default.
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