Weak forces for the growth of smectic-F liquid crystal

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

Research output: Contribution to journalArticle

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Abstract

N(p-n-dodecyloxybenzylidene)p-n-alkylanilines, viz., 12O.m compounds of nO.m series, for m = 4, 5, 6, 8, 10, 12, 14 and 16 are synthesized and characterized by Polarized Thermal Microscopy (TM) and Differential Scanning Calorimetry (DSC). These compounds are found to exhibit 2D Bond-Orientationally (BO) ordered smectic-F liquid crystal phase with shift distortion along with orthogonal smectic-A, -B(cryst) phases. The intermediate members of the compounds of 12O.m series (m<10) are found to exhibit orthogonal smectic phases along with the tilted phases, while the higher homologues (m>10) show the tilted bond-orientational smectic phases only. The miscibility studies for the confirmation of smectic-F phase through binary (12O.12+10O.14) phase diagram, suggests the possibility for the occurrence of smectic-F phase down towards ambient temperatures. The smectic-G phase melting temperature. TFG is found to depress at lower and higher concentrations (x), while smectic-F phase clearing temperature TIF remains constant with the concentration. The thermal span of smectic-F phase is found to depend on the chemical potential (represented by the mole fraction x) in the (T, x) phase diagram. The cubic fit in the vicinity of lower/higher concentrations, qualitatively infers the weak nature of Van der Walls' molecular forces for the growth of pseudo-hexagonal packed quasi-2-D BO ordered SF liquid crystal with a poor registry of positional correlations.

Original languageEnglish
Pages (from-to)19-29
Number of pages11
JournalMolecular Crystals and Liquid Crystals Science and Technology Section A: Molecular Crystals and Liquid Crystals
Volume319
DOIs
Publication statusPublished - 01-01-1998

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Liquid Crystals
Liquid crystals
Phase diagrams
liquid crystals
Chemical potential
phase diagrams
Melting point
Differential scanning calorimetry
Microscopic examination
clearing
Solubility
Temperature
ambient temperature
low concentrations
heat measurement
solubility
melting
occurrences
microscopy
scanning

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics

Cite this

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title = "Weak forces for the growth of smectic-F liquid crystal",
abstract = "N(p-n-dodecyloxybenzylidene)p-n-alkylanilines, viz., 12O.m compounds of nO.m series, for m = 4, 5, 6, 8, 10, 12, 14 and 16 are synthesized and characterized by Polarized Thermal Microscopy (TM) and Differential Scanning Calorimetry (DSC). These compounds are found to exhibit 2D Bond-Orientationally (BO) ordered smectic-F liquid crystal phase with shift distortion along with orthogonal smectic-A, -B(cryst) phases. The intermediate members of the compounds of 12O.m series (m<10) are found to exhibit orthogonal smectic phases along with the tilted phases, while the higher homologues (m>10) show the tilted bond-orientational smectic phases only. The miscibility studies for the confirmation of smectic-F phase through binary (12O.12+10O.14) phase diagram, suggests the possibility for the occurrence of smectic-F phase down towards ambient temperatures. The smectic-G phase melting temperature. TFG is found to depress at lower and higher concentrations (x), while smectic-F phase clearing temperature TIF remains constant with the concentration. The thermal span of smectic-F phase is found to depend on the chemical potential (represented by the mole fraction x) in the (T, x) phase diagram. The cubic fit in the vicinity of lower/higher concentrations, qualitatively infers the weak nature of Van der Walls' molecular forces for the growth of pseudo-hexagonal packed quasi-2-D BO ordered SF liquid crystal with a poor registry of positional correlations.",
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Weak forces for the growth of smectic-F liquid crystal. / Potukuchi, D. M.; Padmaja Rani, G.; Srinivasulu, M.; Pisipati, V. G.K.M.

In: Molecular Crystals and Liquid Crystals Science and Technology Section A: Molecular Crystals and Liquid Crystals, Vol. 319, 01.01.1998, p. 19-29.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Weak forces for the growth of smectic-F liquid crystal

AU - Potukuchi, D. M.

AU - Padmaja Rani, G.

AU - Srinivasulu, M.

AU - Pisipati, V. G.K.M.

PY - 1998/1/1

Y1 - 1998/1/1

N2 - N(p-n-dodecyloxybenzylidene)p-n-alkylanilines, viz., 12O.m compounds of nO.m series, for m = 4, 5, 6, 8, 10, 12, 14 and 16 are synthesized and characterized by Polarized Thermal Microscopy (TM) and Differential Scanning Calorimetry (DSC). These compounds are found to exhibit 2D Bond-Orientationally (BO) ordered smectic-F liquid crystal phase with shift distortion along with orthogonal smectic-A, -B(cryst) phases. The intermediate members of the compounds of 12O.m series (m<10) are found to exhibit orthogonal smectic phases along with the tilted phases, while the higher homologues (m>10) show the tilted bond-orientational smectic phases only. The miscibility studies for the confirmation of smectic-F phase through binary (12O.12+10O.14) phase diagram, suggests the possibility for the occurrence of smectic-F phase down towards ambient temperatures. The smectic-G phase melting temperature. TFG is found to depress at lower and higher concentrations (x), while smectic-F phase clearing temperature TIF remains constant with the concentration. The thermal span of smectic-F phase is found to depend on the chemical potential (represented by the mole fraction x) in the (T, x) phase diagram. The cubic fit in the vicinity of lower/higher concentrations, qualitatively infers the weak nature of Van der Walls' molecular forces for the growth of pseudo-hexagonal packed quasi-2-D BO ordered SF liquid crystal with a poor registry of positional correlations.

AB - N(p-n-dodecyloxybenzylidene)p-n-alkylanilines, viz., 12O.m compounds of nO.m series, for m = 4, 5, 6, 8, 10, 12, 14 and 16 are synthesized and characterized by Polarized Thermal Microscopy (TM) and Differential Scanning Calorimetry (DSC). These compounds are found to exhibit 2D Bond-Orientationally (BO) ordered smectic-F liquid crystal phase with shift distortion along with orthogonal smectic-A, -B(cryst) phases. The intermediate members of the compounds of 12O.m series (m<10) are found to exhibit orthogonal smectic phases along with the tilted phases, while the higher homologues (m>10) show the tilted bond-orientational smectic phases only. The miscibility studies for the confirmation of smectic-F phase through binary (12O.12+10O.14) phase diagram, suggests the possibility for the occurrence of smectic-F phase down towards ambient temperatures. The smectic-G phase melting temperature. TFG is found to depress at lower and higher concentrations (x), while smectic-F phase clearing temperature TIF remains constant with the concentration. The thermal span of smectic-F phase is found to depend on the chemical potential (represented by the mole fraction x) in the (T, x) phase diagram. The cubic fit in the vicinity of lower/higher concentrations, qualitatively infers the weak nature of Van der Walls' molecular forces for the growth of pseudo-hexagonal packed quasi-2-D BO ordered SF liquid crystal with a poor registry of positional correlations.

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SN - 1542-1406

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