Vibrational density of states of triphenylene based discotic liquid crystals: Dependence on the length of the alkyl chain
Physical Chemistry Chemical Physics, ISSN: 1463-9076, Vol: 16, Issue: 16, Page: 7324-7333
2014
- 38Citations
- 23Captures
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Metrics Details
- Citations38
- Citation Indexes38
- CrossRef38
- 37
- Captures23
- Readers23
- 23
Article Description
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 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. This journal is © the Partner Organisations 2014.
Bibliographic Details
http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=84897062926&origin=inward; http://dx.doi.org/10.1039/c3cp55303e; http://www.ncbi.nlm.nih.gov/pubmed/24623092; http://xlink.rsc.org/?DOI=C3CP55303E; http://pubs.rsc.org/en/content/articlepdf/2014/CP/C3CP55303E; https://xlink.rsc.org/?DOI=C3CP55303E; https://dx.doi.org/10.1039/c3cp55303e; https://pubs.rsc.org/en/content/articlelanding/2014/cp/c3cp55303e
Royal Society of Chemistry (RSC)
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