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Structure of nanoscale-pitch helical phases: blue phase and twist-bend nematic phase resolved by resonant soft X-ray scattering

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dc.abstract.enPeriodic structures of phases with orientational order of molecules but homogenous electron density distribution: a short pitch cholesteric phase, blue phase and twist-bend nematic phase, were probed by resonant soft X-ray scattering (RSoXS) at the carbon K-edge. The theoretical model shows that in the case of a simple heliconical nematic structure, two resonant signals corresponding to the full and half pitch band should be present, while only the full pitch band is observed experimentally. This suggests that the twist-bend nematic phase has a complex structure with a double-helix built of two interlocked, shifted helices. We confirm that the helical pitch in the twist-bend nematic phase is in a 10 nm range for both the chiral and achiral materials. We also show that the symmetry of the blue phase can be unambiguously determined through a resonant enhancement of the X-ray diffraction signals, by including polarization effects, which are found to be an important indicator in phase structure determination.
dc.affiliationUniwersytet Warszawski
dc.contributor.authorPociecha, Damian
dc.contributor.authorWang, Cheng
dc.contributor.authorZhu, Chenhui
dc.contributor.authorSalamończyk, Mirosław
dc.contributor.authorVaupotic, Natasa
dc.contributor.authorGórecka, Ewa
dc.date.accessioned2024-01-26T08:22:13Z
dc.date.available2024-01-26T08:22:13Z
dc.date.copyright2017-08-18
dc.date.issued2017
dc.description.accesstimeAT_PUBLICATION
dc.description.financeNie dotyczy
dc.description.number38
dc.description.versionFINAL_PUBLISHED
dc.description.volume13
dc.identifier.doi10.1039/C7SM00967D
dc.identifier.issn1744-683X
dc.identifier.urihttps://repozytorium.uw.edu.pl//handle/item/120934
dc.languageabk
dc.pbn.affiliationchemical sciences
dc.relation.ispartofSoft Matter
dc.relation.pages6694-6699
dc.rightsCC-BY
dc.sciencecloudnosend
dc.titleStructure of nanoscale-pitch helical phases: blue phase and twist-bend nematic phase resolved by resonant soft X-ray scattering
dc.typeJournalArticle
dspace.entity.typePublication