Dilatometric studies across the isotropic to smectic-F transition

M. Srinivasulu, D. M. Potukuchi, V. G K M Pisipati

Research output: Contribution to journalArticle

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Abstract

Thermal Microscopy (TM), Differential Scanning Calorimetry (DSC) and dilatometric studies were carried out to characterise the liquid crystalline phases and mesomorphic transitions exhibited by three higher homologues of N-(p-n-dodecyloxy benzylidene)p-n-alkyl anilines, viz., N-(p-n-dodecyloxy benzylidene)p-n-dodecyl aniline, (12O.12), N-(p-n-dodecyloxy benzylidene)p-n-tetradecyl aniline, (12O.14) and (N-(p-n-dodecyloxy benzylidene)p-n-hexadecyl aniline, (12O.16). The three compounds exhibit enantiotropic smectic-F and smectic-G liquid crystalline phases between the isotropic liquid and the solid crystal. The change in density across the phase transformations and the thermal expansion coefficient confirm the first order nature of the isotropic to smectic-F (I-SmF) and smectic-F to smectic-G (SmF-SmG) transitions. The dilatometric studies infer strong pre-transitional fluctuations in a relatively large thermal range. The pre-transitional effects are estimated by αeff in the vicinity of the mesomorphic fluctuation-dominated non-linear region (FDNLR) of the I-SmF transition. The strength of non linear growth of density fluctuations is discussed in the wake of reports at the I-N, I-SmA and I-SmC transitions.

Original languageEnglish
Pages (from-to)713-716
Number of pages4
JournalZeitschrift fur Naturforschung - Section A Journal of Physical Sciences
Volume52
Issue number10
Publication statusPublished - 01-10-1997

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aniline
Aniline Compounds
Liquids
Liquid
Fluctuations
Crystalline materials
liquids
Thermal expansion
Thermal Expansion
Phase Transformation
Differential scanning calorimetry
Microscopic examination
Wake
Phase transitions
Microscopy
wakes
phase transformations
Scanning
thermal expansion
Crystals

All Science Journal Classification (ASJC) codes

  • Physical and Theoretical Chemistry

Cite this

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title = "Dilatometric studies across the isotropic to smectic-F transition",
abstract = "Thermal Microscopy (TM), Differential Scanning Calorimetry (DSC) and dilatometric studies were carried out to characterise the liquid crystalline phases and mesomorphic transitions exhibited by three higher homologues of N-(p-n-dodecyloxy benzylidene)p-n-alkyl anilines, viz., N-(p-n-dodecyloxy benzylidene)p-n-dodecyl aniline, (12O.12), N-(p-n-dodecyloxy benzylidene)p-n-tetradecyl aniline, (12O.14) and (N-(p-n-dodecyloxy benzylidene)p-n-hexadecyl aniline, (12O.16). The three compounds exhibit enantiotropic smectic-F and smectic-G liquid crystalline phases between the isotropic liquid and the solid crystal. The change in density across the phase transformations and the thermal expansion coefficient confirm the first order nature of the isotropic to smectic-F (I-SmF) and smectic-F to smectic-G (SmF-SmG) transitions. The dilatometric studies infer strong pre-transitional fluctuations in a relatively large thermal range. The pre-transitional effects are estimated by αeff in the vicinity of the mesomorphic fluctuation-dominated non-linear region (FDNLR) of the I-SmF transition. The strength of non linear growth of density fluctuations is discussed in the wake of reports at the I-N, I-SmA and I-SmC transitions.",
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Dilatometric studies across the isotropic to smectic-F transition. / Srinivasulu, M.; Potukuchi, D. M.; Pisipati, V. G K M.

In: Zeitschrift fur Naturforschung - Section A Journal of Physical Sciences, Vol. 52, No. 10, 01.10.1997, p. 713-716.

Research output: Contribution to journalArticle

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