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| 001 | 151796 | ||
| 005 | 20240619091952.0 | ||
| 024 | 7 | _ | |a 10.1039/c3cp55303e |2 doi |
| 024 | 7 | _ | |a 1463-9076 |2 ISSN |
| 024 | 7 | _ | |a 1463-9084 |2 ISSN |
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| 037 | _ | _ | |a FZJ-2014-01675 |
| 082 | _ | _ | |a 540 |
| 100 | 1 | _ | |a Krause, Christina |0 P:(DE-HGF)0 |b 0 |e Corresponding author |
| 245 | _ | _ | |a Vibrational Density of States of Triphenylene Based Discotic Liquid Crystals: Dependence on the Length of the Alkyl Chain |
| 260 | _ | _ | |a Cambridge |c 2014 |b RSC Publ. |
| 336 | 7 | _ | |a Journal Article |b journal |m journal |0 PUB:(DE-HGF)16 |s 1409307067_6676 |2 PUB:(DE-HGF) |
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| 520 | _ | _ | |a The vibrational density of states of a series of homologous triphenylene-based discotic liquid crystals HATn (n = 5, 6, 8, 10, 12) depending on the length of the aliphatic side chain is investigated by means of inelastic neutron scattering. All studied materials have a plastic crystalline phase at low temperatures, followed by a hexagonally ordered liquid crystalline phase at higher temperatures and a quasi isotropic phase at the highest temperatures. The X-ray scattering pattern for the plastic crystalline phase of all materials shows a sharp Bragg reflection corresponding to the intercolumnar distance in the lower q-range and a peak at circa 17 nm−1 related to intracolumnar distances between the cores perpendicular to the columns as well as a broad amorphous halo related to the disordered structure of the methylene groups in the side chains in the higher q-range. The intercolumnar distance increases linearly with increasing chain length for the hexagonal columnar ordered liquid crystalline phase. A similar behaviour is assumed for the plastic crystalline phase. Besides n = 8 all materials under study exhibit a Boson peak. With increasing chain length, the frequency of the Boson peak decreases and its intensity increases. This can be explained by a self-organized confinement model. The peaks for n = 10, 12 are much narrower than for n = 5, 6 which might imply the transformation from a rigid system to a softer one with increasing chain length. Moreover the results can also be discussed in the framework of a transition from an uncorrelated to a correlated disorder with increasing n where n = 8 might be speculatively considered as a transitional state. |
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| 773 | _ | _ | |a 10.1039/c3cp55303e |g p. 10.1039.c3cp55303e |0 PERI:(DE-600)1476244-4 |p 7324 - 7333 |t Physical chemistry, chemical physics |v 16 |y 2014 |x 1463-9084 |
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