Please use this identifier to cite or link to this item: http://hdl.handle.net/2289/4638
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dc.contributor.authorMaeda, Yoji-
dc.contributor.authorRao, Shankar D.S.-
dc.contributor.authorPrasad, Krishna S.-
dc.contributor.authorChandrasekhar, S.-
dc.contributor.authorKumar, Sandeep-
dc.date.accessioned2012-06-07T08:48:34Z-
dc.date.available2012-06-07T08:48:34Z-
dc.date.issued2003-
dc.identifier.citationMolecular Crystals and Liquid Crystals, 2003, Vol.397, p129-142en
dc.identifier.issn1542-1406-
dc.identifier.issn1563-5287 (Online)-
dc.identifier.urihttp://hdl.handle.net/2289/4638-
dc.descriptionRestricted Access.en
dc.description.abstractThe phase behaviour of the discotic mesogen 2,3,6,7,10,11-hexahexylthiotriphenylene (HHTT) was investigated under hydrostatic pressures up to 300MPa using wide-angle X-ray diffraction equipped with a high-pressure vessel. The reversible transitions of HHTT, i.e., crystal (Cr) – helical phase (H) – hexagonal columnar phase (Colh) – isotropic liquid (I), were observed under pressures up to about 30 MPa. The transition sequence changed significantly depending on the applied pressure. The H phase appeared monotropically in the pressure region between 50 and 180 MPa, indicating the Cr?Colh?I on heating and I?Colh?H?Cr transition sequences on cooling. Applying higher pressures altered further the phase behaviour: the enantiotropic Colh phase changed to monotropic one under high pressures above 180 MPa, indicating the Cr?I on heating and I?Colh?Cr transition sequences on cooling. The X-ray diffraction pattern of the H phase exhibited a sharp low-angle and a wide-angle reflections corresponding to the intercolumnar and the core-core distances, respectively. This feature is indicative of the three-dimensional ordering present in the H phase. On the other hand, the Colh phase showed only a low-angle reflection. It was found that the intercolumnar distance in the Colh phase decreases with increasing temperature at high pressures. This indicates that the negative coefficient of thermal expansion for the column packing in the Colh phase is held under pressure.en
dc.language.isoenen
dc.publisherTaylor & Francisen
dc.relation.urihttp://dx.doi.org/10.1080/15421400390214077en
dc.rights2003 Taylor & Francisen
dc.subjectHHTTen
dc.subjecthigh-pressure WAXDen
dc.subjectP vs. T phase diagramen
dc.subjecthelical phaseen
dc.subjectcolumnar hexagonal phaseen
dc.subjectmonotropic transitionsen
dc.subjecttriple pointsen
dc.titlePhase behaviour of the discotic mesogen 2,3,6,7,10,11-Hexahexyl Thiotriphenylene (HHTT) under pressureen
dc.typeArticleen
Appears in Collections:Research Papers (SCM)

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