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Understanding the distinctive elastic constants in an oxadiazole bent-core nematic liquid crystal

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Understanding the distinctive elastic constants in an oxadiazole bent-core nematic liquid crystal. / Kaur, S.; Addis, J.; Greco, C. et al.
In: Physical Review E, Vol. 86, No. 4, 041703, 05.10.2012.

Research output: Contribution to Journal/MagazineJournal articlepeer-review

Harvard

Kaur, S, Addis, J, Greco, C, Ferrarini, A, Goertz, V, Goodby, JW & Gleeson, HF 2012, 'Understanding the distinctive elastic constants in an oxadiazole bent-core nematic liquid crystal', Physical Review E, vol. 86, no. 4, 041703. https://doi.org/10.1103/PhysRevE.86.041703

APA

Kaur, S., Addis, J., Greco, C., Ferrarini, A., Goertz, V., Goodby, J. W., & Gleeson, H. F. (2012). Understanding the distinctive elastic constants in an oxadiazole bent-core nematic liquid crystal. Physical Review E, 86(4), Article 041703. https://doi.org/10.1103/PhysRevE.86.041703

Vancouver

Kaur S, Addis J, Greco C, Ferrarini A, Goertz V, Goodby JW et al. Understanding the distinctive elastic constants in an oxadiazole bent-core nematic liquid crystal. Physical Review E. 2012 Oct 5;86(4):041703. doi: 10.1103/PhysRevE.86.041703

Author

Kaur, S. ; Addis, J. ; Greco, C. et al. / Understanding the distinctive elastic constants in an oxadiazole bent-core nematic liquid crystal. In: Physical Review E. 2012 ; Vol. 86, No. 4.

Bibtex

@article{60135076a793463da119c8195318353f,
title = "Understanding the distinctive elastic constants in an oxadiazole bent-core nematic liquid crystal",
abstract = "The splay and bend elastic constants of the bent-core oxadiazole material [C5-Ph-ODBP-Ph-OC12] have been investigated as a function of temperature across the nematic phase. The bend constant K-33 is found to take values of similar to 3.0 pN and to be almost temperature independent, whereas, the splay constant K-11 increases monotonically from similar to 3.5 pN close to the isotropic phase transition to values of similar to 9 pN deep in the nematic phase. No pretransitional divergence is observed in either K-11 or K-33 at temperatures approaching the underlying phase. This behavior of the elastic constants is distinct from that observed in rodlike liquid crystal systems but appears to share characteristics with the few other bent-core nematic systems studied to date. We discuss the interdependence of the elastic constants, the birefringence, and the order parameter to allow a comparison of the observed behavior with theory. We show that calculations of the elastic constants via molecular-field theory and atomistic modeling are in excellent qualitative as well as good quantitative (within 2 pN) agreement with the measurements across the temperature range, offering a deeper understanding of the elasticity in bent-core nematic materials than has been, hitherto, available.",
keywords = "BANANA-SHAPED MOLECULES, PHASE-TRANSITIONS, PHENYL BENZOATE, ROD-LIKE, MESOPHASE, VISCOSITY, COMPOUND, MIXTURES, MESOGEN, ORDER",
author = "S. Kaur and J. Addis and C. Greco and A. Ferrarini and V. Goertz and Goodby, {J. W.} and Gleeson, {H. F.}",
note = "{\textcopyright}2012 American Physical Society",
year = "2012",
month = oct,
day = "5",
doi = "10.1103/PhysRevE.86.041703",
language = "English",
volume = "86",
journal = "Physical Review E",
issn = "1539-3755",
publisher = "American Physical Society",
number = "4",

}

RIS

TY - JOUR

T1 - Understanding the distinctive elastic constants in an oxadiazole bent-core nematic liquid crystal

AU - Kaur, S.

AU - Addis, J.

AU - Greco, C.

AU - Ferrarini, A.

AU - Goertz, V.

AU - Goodby, J. W.

AU - Gleeson, H. F.

N1 - ©2012 American Physical Society

PY - 2012/10/5

Y1 - 2012/10/5

N2 - The splay and bend elastic constants of the bent-core oxadiazole material [C5-Ph-ODBP-Ph-OC12] have been investigated as a function of temperature across the nematic phase. The bend constant K-33 is found to take values of similar to 3.0 pN and to be almost temperature independent, whereas, the splay constant K-11 increases monotonically from similar to 3.5 pN close to the isotropic phase transition to values of similar to 9 pN deep in the nematic phase. No pretransitional divergence is observed in either K-11 or K-33 at temperatures approaching the underlying phase. This behavior of the elastic constants is distinct from that observed in rodlike liquid crystal systems but appears to share characteristics with the few other bent-core nematic systems studied to date. We discuss the interdependence of the elastic constants, the birefringence, and the order parameter to allow a comparison of the observed behavior with theory. We show that calculations of the elastic constants via molecular-field theory and atomistic modeling are in excellent qualitative as well as good quantitative (within 2 pN) agreement with the measurements across the temperature range, offering a deeper understanding of the elasticity in bent-core nematic materials than has been, hitherto, available.

AB - The splay and bend elastic constants of the bent-core oxadiazole material [C5-Ph-ODBP-Ph-OC12] have been investigated as a function of temperature across the nematic phase. The bend constant K-33 is found to take values of similar to 3.0 pN and to be almost temperature independent, whereas, the splay constant K-11 increases monotonically from similar to 3.5 pN close to the isotropic phase transition to values of similar to 9 pN deep in the nematic phase. No pretransitional divergence is observed in either K-11 or K-33 at temperatures approaching the underlying phase. This behavior of the elastic constants is distinct from that observed in rodlike liquid crystal systems but appears to share characteristics with the few other bent-core nematic systems studied to date. We discuss the interdependence of the elastic constants, the birefringence, and the order parameter to allow a comparison of the observed behavior with theory. We show that calculations of the elastic constants via molecular-field theory and atomistic modeling are in excellent qualitative as well as good quantitative (within 2 pN) agreement with the measurements across the temperature range, offering a deeper understanding of the elasticity in bent-core nematic materials than has been, hitherto, available.

KW - BANANA-SHAPED MOLECULES

KW - PHASE-TRANSITIONS

KW - PHENYL BENZOATE

KW - ROD-LIKE

KW - MESOPHASE

KW - VISCOSITY

KW - COMPOUND

KW - MIXTURES

KW - MESOGEN

KW - ORDER

U2 - 10.1103/PhysRevE.86.041703

DO - 10.1103/PhysRevE.86.041703

M3 - Journal article

VL - 86

JO - Physical Review E

JF - Physical Review E

SN - 1539-3755

IS - 4

M1 - 041703

ER -