Molecular organization in the twist-bend nematic phase by resonant X-ray scattering at the Se K-edge and by SAXS, WAXS and GIXRD

Physical Chemistry Chemical Physics : PCCP
W D StevensonGeorg H Mehl

Abstract

Using a magnetically aligned liquid crystal mixture containing a novel Se-labelled dimer and the difluoroterphenyl dimer DTC5C7, the twist-bend nematic phase (Ntb) was studied by the resonant scattering of hard X-rays and by conventional small and wide-angle X-ray scattering (SAXS, WAXS). Resonant diffraction spots indicated a helix with a 9-12 nm pitch in the Ntb phase and an unprecedentedly high helix orientation. This enabled deconvolution of global and local order parameters. These findings, combined with the simultaneously recorded resonant and non-resonant SAXS and WAXS data, allowed us to construct a locally layered molecular model of the Ntb phase, where the average twisted conformation of each molecule was idealised as a helical segment, matching the local heliconical director field. The dimers were found to be less bent in the Ntb phase than in their minimum energy conformation, and straightening further with increasing temperature. It is proposed that on further heating their low bend angle allows the transition to the normal nematic phase, where the molecules can freely move longitudinally, without the need to perform screw-like motion as in the Ntb phase. At the low-temperature end, the increasing molecular twist b...Continue Reading

References

Nov 17, 2001·Chemical Reviews·J L HodeauJ F Berar
Nov 9, 2011·Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics·M CestariH Zimmermann
Jun 12, 2012·The Journal of Physical Chemistry. B·Laetitia BeguinHerbert Zimmermann
Sep 6, 2013·Proceedings of the National Academy of Sciences of the United States of America·Dong ChenNoel A Clark
Sep 17, 2013·Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics·K AdlemD Wilkes
Nov 6, 2013·Nature Communications·V BorshchO D Lavrentovich
Jul 16, 2014·Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics·P K ChallaA Jákli
Jan 13, 2015·Soft Matter·Anke HoffmannDemetri J Photinos
Sep 30, 2015·Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry·Carsten Tschierske, Goran Ungar
Jan 15, 2016·Soft Matter·Alexandros G Vanakaras, Demetri J Photinos

❮ Previous
Next ❯

Citations

Apr 18, 2018·Chemical Record : an Official Publication of the Chemical Society of Japan ... [et Al.]·Richard J Mandle
Feb 28, 2018·Soft Matter·Warren D StevensonGoran Ungar
Oct 17, 2018·Soft Matter·Anamarija KneŽevićAndreja Lesac
Feb 9, 2019·Physical Chemistry Chemical Physics : PCCP·Alina AluculeseiGeorg H Mehl
Jun 7, 2019·Physical Chemistry Chemical Physics : PCCP·Zeinab ParsouziSamuel Sprunt
Oct 13, 2018·Proceedings of the National Academy of Sciences of the United States of America·Grzegorz PająkAgnieszka Chrzanowska
Aug 30, 2020·Nanomaterials·Francesco VitaOriano Francescangeli
Jan 28, 2021·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Emily E PocockJohn W Goodby
Feb 16, 2021·Physical Chemistry Chemical Physics : PCCP·R SahaA Jákli
Jan 17, 2019·The Journal of Physical Chemistry. B·J CarvalhoG H Mehl
Sep 27, 2018·Langmuir : the ACS Journal of Surfaces and Colloids·Alexey EreminHideo Takezoe
Nov 17, 2020·The Journal of Physical Chemistry. C, Nanomaterials and Interfaces·Lech Longa, Wojciech Tomczyk

❮ Previous
Next ❯

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.