Twist-Bend Nematic Phase from the Landau-de Gennes Perspective

The Journal of Physical Chemistry. C, Nanomaterials and Interfaces
Lech Longa, Wojciech Tomczyk

Abstract

Generalized Landau-de Gennes theory is proposed that comprehensively explains currently available experimental data for the heliconical twist-bend nematic (NTB) phase observed in liquid crystalline systems of chemically achiral bent-core-like molecules. A bifurcation analysis gives insight into possible structures that the model can predict and guides in the numerical analysis of relative stability of the isotropic (I), uniaxial nematic (NU), and twist-bend nematic phases. An estimate of constitutive parameters of the model from temperature variation of the nematic order parameter and the Frank elastic constants in the nematic phase enables us to demonstrate quantitative agreement between the calculated and experimentally determined temperature dependence of the pitch and conical angle in NTB. Properties of order parameters also explain a puzzling lack of a half-pitch band in resonant soft X-ray scattering. Other key findings of the model are predictions of I-NTB and NU-NTB tricritical points and insight into biaxiality of NTB.

References

Feb 15, 1989·Physical Review A: General Physics·L Longa, H Trebin
Sep 15, 1990·Physical Review. a·L Longa, H R Trebin
Sep 4, 2008·Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics·David Allender, Lech Longa
Nov 9, 2011·Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics·M CestariH Zimmermann
Mar 10, 2012·Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics·Katie L AtkinsonHarry J Coles
Jun 19, 2013·Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics·Shaikh M ShamidJonathan V Selinger
Sep 6, 2013·Proceedings of the National Academy of Sciences of the United States of America·Dong ChenNoel A Clark
Nov 6, 2013·Nature Communications·V BorshchO D Lavrentovich
Apr 23, 2015·Chemistry : a European Journal·Richard J MandleJohn W Goodby
Nov 10, 2015·Physical Review Letters·Cristina Greco, Alberta Ferrarini
May 14, 2016·Physical Review. E·Lech Longa, Grzegorz Pająk
Sep 9, 2016·Soft Matter·Wojciech TomczykLech Longa
Jan 20, 2018·Physical Review. E·Greta BabakhanovaOleg D Lavrentovich
Jun 13, 2018·Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry·Nataša VaupotičDamian Pociecha
Oct 13, 2018·Proceedings of the National Academy of Sciences of the United States of America·Grzegorz PająkAgnieszka Chrzanowska
Mar 14, 2019·Physical Chemistry Chemical Physics : PCCP·Richard J Mandle, John W Goodby
May 16, 2019·Proceedings of the National Academy of Sciences of the United States of America·Michael R TuchbandNoel A Clark
Sep 10, 2019·Soft Matter·Jiale ShiJonathan K Whitmer
Mar 15, 2020·Physical Review. E·Martin Čopič, Alenka Mertelj
Jun 15, 2020·The Journal of Chemical Physics·Carmine AnzivinoMarjolein Dijkstra

❮ Previous
Next ❯

Citations


❮ Previous
Next ❯

Methods Mentioned

BETA
X-ray
nuclear magnetic resonance

Related Concepts

Trending Feeds

COVID-19

Coronaviruses encompass a large family of viruses that cause the common cold as well as more serious diseases, such as the ongoing outbreak of coronavirus disease 2019 (COVID-19; formally known as 2019-nCoV). Coronaviruses can spread from animals to humans; symptoms include fever, cough, shortness of breath, and breathing difficulties; in more severe cases, infection can lead to death. This feed covers recent research on COVID-19.

Blastomycosis

Blastomycosis fungal infections spread through inhaling Blastomyces dermatitidis spores. Discover the latest research on blastomycosis fungal infections here.

Nuclear Pore Complex in ALS/FTD

Alterations in nucleocytoplasmic transport, controlled by the nuclear pore complex, may be involved in the pathomechanism underlying multiple neurodegenerative diseases including Amyotrophic Lateral Sclerosis and Frontotemporal Dementia. Here is the latest research on the nuclear pore complex in ALS and FTD.

Applications of Molecular Barcoding

The concept of molecular barcoding is that each original DNA or RNA molecule is attached to a unique sequence barcode. Sequence reads having different barcodes represent different original molecules, while sequence reads having the same barcode are results of PCR duplication from one original molecule. Discover the latest research on molecular barcoding here.

Chronic Fatigue Syndrome

Chronic fatigue syndrome is a disease characterized by unexplained disabling fatigue; the pathology of which is incompletely understood. Discover the latest research on chronic fatigue syndrome here.

Evolution of Pluripotency

Pluripotency refers to the ability of a cell to develop into three primary germ cell layers of the embryo. This feed focuses on the mechanisms that underlie the evolution of pluripotency. Here is the latest research.

Position Effect Variegation

Position Effect Variagation occurs when a gene is inactivated due to its positioning near heterochromatic regions within a chromosome. Discover the latest research on Position Effect Variagation here.

STING Receptor Agonists

Stimulator of IFN genes (STING) are a group of transmembrane proteins that are involved in the induction of type I interferon that is important in the innate immune response. The stimulation of STING has been an active area of research in the treatment of cancer and infectious diseases. Here is the latest research on STING receptor agonists.

Microbicide

Microbicides are products that can be applied to vaginal or rectal mucosal surfaces with the goal of preventing, or at least significantly reducing, the transmission of sexually transmitted infections. Here is the latest research on microbicides.