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Hierarchical twist: chirality across scales in cellulose cholesterics

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datacite.subject.fosHumanidades::Artes
datacite.subject.sdg04:Educação de Qualidade
dc.contributor.authorMonge, N.
dc.contributor.authorPinto, L. F. V.
dc.contributor.authorFerreira, E.
dc.contributor.authorAlmeida, P. L.
dc.contributor.authorFigueirinhas, J. L.
dc.contributor.authorCarvalho, A. L.
dc.contributor.authorSebastião, P. J.
dc.contributor.authorGodinho, M. H.
dc.date.accessioned2026-09-04T14:35:44Z
dc.date.available2026-09-04T14:35:44Z
dc.date.issued2025
dc.description.abstractOne of the unresolved aspects of cellulose-based liquid crystalline phases is their chirality. Although cellulose is intrinsically chiral, both left-handed (LH) and right-handed (RH) chiral nematic phases are reported in cellulose derivatives under different conditions. The origin of these discrepancies—and whether LH and RH twisted structures coexist within a single material—has remained unclear. Here, the first direct evidence of hierarchical LH and RH twisted structures coexisting in a solvent-free, thermotropic cellulose derivative at room temperature is provided. Free-standing cholesteric films exhibit distinct LH and RH twisted domains, whose pitches respond oppositely to uniaxial mechanical strain: the LH pitch increases, while the RH pitch decreases with increasing strain. This contrasting response results from the coexistence of intertwined LH and RH twisted structures, whose optical axes are oriented differently relative to the strain direction. Notably, after stretching beyond their elastic limit, the films spontaneously recover their original shape within minutes. During this recovery, circular dichroism (CD) measurements reveal an increase in RH pitch and a decrease in LH pitch, evidencing reversible, strain-responsive behavior. Multiscale structural characterization confirms the hierarchical chiral organization and its mechanoresponsive nature, providing new insights into the origin of chirality in cellulose-based liquid crystalline materials.eng
dc.identifier.citationN. Monge, L. Pinto, E. Ferreira, et al. “ Hierarchical Twist: Chirality Across Scales in Cellulose Cholesterics.” Adv. Optical Mater. 14, no. 4 (2026): e02728. https://doi.org/10.1002/adom.202502728
dc.identifier.doihttps://doi.org/10.1002/adom.202502728
dc.identifier.issn2195-1071
dc.identifier.urihttp://hdl.handle.net/10400.21/23040
dc.language.isoeng
dc.peerreviewedn/a
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/
dc.subjectmaterial
dc.subjectCellulose
dc.subjectHierarchical twist
dc.titleHierarchical twist: chirality across scales in cellulose cholestericspor
dc.typereport
dcterms.referenceshttps://advanced.onlinelibrary.wiley.com/doi/full/10.1002/adom.202502728
dspace.entity.typePublication
oaire.citation.issue4
oaire.citation.titleAdvanced Optical Materials
oaire.citation.volume14
oaire.versionhttp://purl.org/coar/version/c_970fb48d4fbd8a85

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