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Understanding the twist-bend nematic phase: the characterisation of 1-(4-cyanobiphenyl-4'-yloxy)-6-(4-cyanobiphenyl-4'--yl)hexane (CB6OCB) and comparison with CB7CB
dc.contributor.author | Paterson, Daniel A. |
dc.contributor.author | Gao, Min |
dc.contributor.author | Kim, Young-Ki |
dc.contributor.author | Robles Hernández, Beatriz |
dc.contributor.author | Díez Berart, Sergio |
dc.contributor.author | Salud Puig, Josep |
dc.contributor.author | López Pérez, David Orencio |
dc.contributor.other | Universitat Politècnica de Catalunya. Departament de Física |
dc.date.accessioned | 2016-11-04T10:32:19Z |
dc.date.available | 2016-11-04T10:32:19Z |
dc.date.issued | 2016-08-28 |
dc.identifier.citation | Paterson, D., Gao, M., Kim, Y., Robles-Hernández, B., Diez, S., Salud, J., Lopez, D. Understanding the twist-bend nematic phase: the characterisation of 1-(4-cyanobiphenyl-4'-yloxy)-6-(4-cyanobiphenyl-4'--yl)hexane (CB6OCB) and comparison with CB7CB. "Soft matter", 28 Agost 2016, vol. 12, núm. 32, p. 6827-6840. |
dc.identifier.issn | 1744-683X |
dc.identifier.uri | http://hdl.handle.net/2117/91470 |
dc.description.abstract | The synthesis and characterisation of the nonsymmetric liquid crystal dimer, 1-(4-cyanobiphenyl-40-yloxy)-6- (4-cyanobiphenyl-40-yl)hexane (CB6OCB) is reported. An enantiotropic nematic (N)–twist-bend nematic (NTB) phase transition is observed at 109 1C and a nematic–isotropic phase transition at 153 1C. The NTB phase assignment has been confirmed using polarised light microscopy, freeze fracture transmission electron microscopy (FFTEM), 2H-NMR spectroscopy, and X-ray diffraction. The effective molecular length in both the NTB and N phases indicates a locally intercalated arrangement of the molecules, and the helicoidal pitch length in the NTB phase is estimated to be 8.9 nm. The surface anchoring properties of CB6OCB on a number of aligning layers is reported. A Landau model is applied to describe high-resolution heat capacity measurements in the vicinity of the NTB–N phase transition. Both the theory and heat capacity measurements agree with a very weak first-order phase transition. A complementary extended molecular field theory was found to be in suggestive accord with the 2H-NMR studies of CB6OCB-d2, and those already known for CB7CB-d4. These include the reduced transition temperature, TNTBN/TNI, the order parameter of the mesogenic arms in the N phase close to the NTB–N transition, and the order parameter with respect to the helix axis which is related to the conical angle for the NTB phase. |
dc.format.extent | 14 p. |
dc.language.iso | eng |
dc.rights.uri | http://creativecommons.org/licenses/by-nc-nd/3.0/es/ |
dc.subject | Àrees temàtiques de la UPC::Física::Física molecular |
dc.subject | Àrees temàtiques de la UPC::Enginyeria química::Química física |
dc.subject.lcsh | Thermodynamics |
dc.subject.lcsh | Transmission electron microscopy |
dc.subject.lcsh | Liquid crystals |
dc.subject.other | Dimers |
dc.subject.other | Hexane |
dc.subject.other | High resolution transmission electron microscopy |
dc.subject.other | Liquid crystals |
dc.subject.other | Nematic liquid crystals |
dc.subject.other | Nuclear magnetic resonance spectroscopy |
dc.title | Understanding the twist-bend nematic phase: the characterisation of 1-(4-cyanobiphenyl-4'-yloxy)-6-(4-cyanobiphenyl-4'--yl)hexane (CB6OCB) and comparison with CB7CB |
dc.type | Article |
dc.subject.lemac | Termodinàmica |
dc.subject.lemac | Microscòpia electrònica de transmissió |
dc.subject.lemac | Cristalls líquids |
dc.identifier.doi | 10.1039/c6sm00537c |
dc.rights.access | Open Access |
local.identifier.drac | 19242330 |
dc.description.version | Postprint (published version) |
local.citation.author | Paterson, D.; Gao, M.; Kim, Y.; Robles-Hernández, B.; Diez, S.; Salud, J.; Lopez, D. |
local.citation.publicationName | Soft matter |
local.citation.volume | 12 |
local.citation.number | 32 |
local.citation.startingPage | 6827 |
local.citation.endingPage | 6840 |
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