Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
The twist-bend nematic phase: translational self-diffusion and biaxiality studied by H-1 nuclear magnetic resonance diffusometry
KTH, School of Chemical Science and Engineering (CHE), Chemistry.ORCID iD: 0000-0002-6524-1441
Show others and affiliations
2017 (English)In: Liquid crystals (Print), ISSN 0267-8292, E-ISSN 1366-5855, Vol. 44, no 1, 204-218 p.Article in journal (Refereed) Published
Abstract [en]

Recently, there has been a surge of interest in mesogens exhibiting the twist-bend nematic (N-TB) phase that is shown to be chiral even though formed by effectively achiral molecules. Although it now seems to be clear that the N-TB phase in the bulk is formed by degenerate domains having opposite handedness, the presence of a supramolecular heliconical structure proposed in the Dozov model has been contradicted by the Hoffmann et al. model in which the heliconical arrangement is replaced by a polar nematic phase. The evidence in support of this is that the quadrupolar splitting tensor measured in various experiments is uniaxial and not biaxial as expected for the twist-bend nematic structure. In this debate, among other evidence, the molecular translational diffusion, and its magnitude with respect to that in the nematic phase above the N-TB phase, has also been invoked to eliminate or to confirm one model or the other. We attempt to resolve this issue by reporting the first measurements of the translational self-diffusion coefficients in the nematic and twist-bend nematic phases formed 1 '',7 ''-bis-4-(4'-cyanobiphenyl-4'-yl) heptane (CB7CB). Such measurements certainly appear to resolve the differences between the two models in favour of that for the classic twist-bend nematic phase. [GRAPHICS] .

Place, publisher, year, edition, pages
TAYLOR & FRANCIS LTD , 2017. Vol. 44, no 1, 204-218 p.
Keyword [en]
Twist-bend nematic, local phase biaxiality, molecular translational diffusion coefficients, macroscopic rotational diffusion, motional averaging, residual quadrupolar tensors
National Category
Chemical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-205171DOI: 10.1080/02678292.2016.1254292ISI: 000397105800017OAI: oai:DiVA.org:kth-205171DiVA: diva2:1088224
Note

QC 20170411

Available from: 2017-04-11 Created: 2017-04-11 Last updated: 2017-04-11Bibliographically approved

Open Access in DiVA

No full text

Other links

Publisher's full text

Search in DiVA

By author/editor
Dvinskikh, Sergey
By organisation
Chemistry
In the same journal
Liquid crystals (Print)
Chemical Sciences

Search outside of DiVA

GoogleGoogle Scholar

Altmetric score

CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf