The helicoidal modulated nematic phases in a model system of V-shaped molecules

被引：4

作者：

Aliev, Mikhail A. ^{[1
]}

Ugolkova, Elena A. ^{[2
]}

Kuzminyh, Nickolay Yu ^{[1
]}

机构：

[1] Inst Biochem Phys, 4 Kosygina Str, Moscow 119334, Russia

[2] Inst Gen & Inorgan Chem, 31 Leninsky Pr, Moscow 119991, Russia

来源：

INTERNATIONAL JOURNAL OF MODERN PHYSICS B | 2019年 / 33卷 / 10期

关键词：

Landau theory of phase transitions; biaxial liquid crystal; modulated nematic phase; LIQUID-CRYSTAL; ISOTROPIC-PHASE; LANDAU THEORY; DIMERS; MESOPHASES; OLIGOMERS; ORDER;

D O I：

10.1142/S0217979219500796

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

The phase behavior of the melt of the symmetric V-shaped molecules has been inspected within the Landau-de Gennes approach. The arms of V-shaped molecule are modeled by rod-like segments connected at an external angle alpha; these segments are assumed to be composed of monomer units. The phase diagram of the system contains regions of stability of the isotropic, homogeneous nematic, and modulated nematic phases: nematic twist bend (N-TB) phase that is characterized by the three directors which move on a helix and one of these directors forms a fixed nonzero cone angle with the helix axis, and the N-0 modulated phase in which one director is parallel to the helix axis while two others are orthogonal to the helix axis. The characteristic periods of modulated structures were found to be of order a few molecular lengths.

引用

页数：24

共 47 条

[1] Phase behavior of the thermotropic melt of asymmetric V-shaped molecules [J].

Aliev, M. A. ;

Kuzminyh, N. Yu. ;

Ugolkova, E. A. .

PHYSICAL REVIEW E, 2017, 95 (04)

[2] The Landau-de Gennes free energy expansion of a melt of V-shaped polymer molecules [J].

Aliev, M. A. ;

Ugolkova, E. A. ;

Kuzminyh, N. Yu. .

JOURNAL OF CHEMICAL PHYSICS, 2016, 145 (08)

[3]

[Anonymous], 2011, MATH METHODS PHYS CO

[4] Chiral dopants and the twist-bend nematic phase - induction of novel mesomorphic behaviour in an apolar bimesogen [J].

Archbold, Craig T. ;

Davis, Edward J. ;

Mandle, Richard J. ;

Cowling, Stephen J. ;

Goodby, John W. .

SOFT MATTER, 2015, 11 (38) :7547-7557

[5] Elastic continuum theory: Towards understanding of the twist-bend nematic phases [J].

Barbero, G. ;

Evangelista, L. R. ;

Rosseto, M. P. ;

Zola, R. S. ;

Lelidis, I. .

PHYSICAL REVIEW E, 2015, 92 (03)

[6] Nematic twist-bend phase with nanoscale modulation of molecular orientation [J].

Borshch, V. ;

Kim, Y. -K. ;

Xiang, J. ;

Gao, M. ;

Jakli, A. ;

Panov, V. P. ;

Vij, J. K. ;

Imrie, C. T. ;

Tamba, M. G. ;

Mehl, G. H. ;

Lavrentovich, O. D. .

NATURE COMMUNICATIONS, 2013, 4

[7] Theory and computer simulation of bent-core molecules [J].

Camp, PJ ;

Allen, MP ;

Masters, AJ .

JOURNAL OF CHEMICAL PHYSICS, 1999, 111 (21) :9871-9881

[8] Phase behavior and properties of the liquid-crystal dimer 1",7"-bis(4-cyanobiphenyl-4′- yl) heptane: A twist-bend nematic liquid crystal [J].

Cestari, M. ;

Diez-Berart, S. ;

Dunmur, D. A. ;

Ferrarini, A. ;

de la Fuente, M. R. ;

Jackson, D. J. B. ;

Lopez, D. O. ;

Luckhurst, G. R. ;

Perez-Jubindo, M. A. ;

Richardson, R. M. ;

Salud, J. ;

Timimi, B. A. ;

Zimmermann, H. .

PHYSICAL REVIEW E, 2011, 84 (03)

[9] Twist-bend heliconical chiral nematic liquid crystal phase of an achiral rigid bent-core mesogen [J].

Chen, Dong ;

Nakata, Michi ;

Shao, Renfan ;

Tuchband, Michael R. ;

Shuai, Min ;

Baumeister, Ute ;

Weissflog, Wolfgang ;

Walba, David M. ;

Glaser, Matthew A. ;

Maclennan, Joseph E. ;

Clark, Noel A. .

PHYSICAL REVIEW E, 2014, 89 (02)

[10] Chiral heliconical ground state of nanoscale pitch in a nematic liquid crystal of achiral molecular dimers [J].

Chen, Dong ;

Porada, Jan H. ;

Hooper, Justin B. ;

Klittnick, Arthur ;

Shen, Yongqiang ;

Tuchband, Michael R. ;

Korblova, Eva ;

Bedrov, Dmitry ;

Walba, David M. ;

Glaser, Matthew A. ;

Maclennan, Joseph E. ;

Clark, Noel A. .

PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA, 2013, 110 (40) :15931-15936

← 1 2 3 4 5 →