DC FieldValueLanguage
dc.contributor.authorYildirim, Arda-
dc.contributor.authorKolmangadi, Mohamed A.-
dc.contributor.authorBühlmeyer, Andrea-
dc.contributor.authorHuber, Patrick-
dc.contributor.authorLaschat, Sabine-
dc.contributor.authorSchönhals, Andreas-
dc.date.accessioned2020-10-27T12:19:36Z-
dc.date.available2020-10-27T12:19:36Z-
dc.date.issued2020-10-01-
dc.identifier.citationThe journal of physical chemistry. B 39 (124): 8728-8739 (2020-10-01)de_DE
dc.identifier.issn1089-5647de_DE
dc.identifier.urihttp://hdl.handle.net/11420/7699-
dc.description.abstractThe phase behavior of two unsymmetrical triphenylene crown ether-based columnar liquid crystals bearing different lengths of alkyl chains, KAL465 and KAL468, was investigated using differential scanning calorimetry (DSC). A plastic crystalline (Cry), a columnar liquid crystalline (Colh), and an isotropic phase were observed along with two glass transitions in the Cry phase. The molecular mobility of the KAL compounds was further studied by a combination of broadband dielectric spectroscopy (BDS) and advanced calorimetric techniques. By the BDS investigations, three dielectric active relaxation processes were observed for both samples. At low temperatures, a γ-process in the Cry state was detected and is assigned to the localized fluctuations taking place in the alkyl chains. An α2-process takes place at higher temperatures in the Cry phase. An α3-process was found in the Colh mesophase. The advanced calorimetric techniques consist of fast scanning calorimetry (FSC) and specific heat spectroscopy employing temperature-modulated DSC and FSC. The advanced calorimetric investigations revealed that besides the α2-process in agreement with BDS, there is a second dynamic glass transition (α1-process), which is not observed by dielectric spectroscopy. The results are in good agreement with the glass transitions detected by DSC for this process. The temperature dependences of the relaxation rates of the α1-, α2-, and α3-processes are all different. Therefore, different molecular assignments for the relaxation processes are proposed. In addition to the relaxation processes, a conductivity contribution was explored by BDS for both KAL compounds. The conductivity contribution appears in both Cry and Colh phases, where the conductivity increases by ca. 1 order of magnitude at phase transition from the Cry to the hexagonal phase.en
dc.language.isoende_DE
dc.relation.ispartofThe journal of physical chemistry Bde_DE
dc.titleElectrical Conductivity and Multiple Glassy Dynamics of Crown Ether-Based Columnar Liquid Crystalsde_DE
dc.typeArticlede_DE
dc.type.diniarticle-
dcterms.DCMITypeText-
tuhh.abstract.englishThe phase behavior of two unsymmetrical triphenylene crown ether-based columnar liquid crystals bearing different lengths of alkyl chains, KAL465 and KAL468, was investigated using differential scanning calorimetry (DSC). A plastic crystalline (Cry), a columnar liquid crystalline (Colh), and an isotropic phase were observed along with two glass transitions in the Cry phase. The molecular mobility of the KAL compounds was further studied by a combination of broadband dielectric spectroscopy (BDS) and advanced calorimetric techniques. By the BDS investigations, three dielectric active relaxation processes were observed for both samples. At low temperatures, a γ-process in the Cry state was detected and is assigned to the localized fluctuations taking place in the alkyl chains. An α2-process takes place at higher temperatures in the Cry phase. An α3-process was found in the Colh mesophase. The advanced calorimetric techniques consist of fast scanning calorimetry (FSC) and specific heat spectroscopy employing temperature-modulated DSC and FSC. The advanced calorimetric investigations revealed that besides the α2-process in agreement with BDS, there is a second dynamic glass transition (α1-process), which is not observed by dielectric spectroscopy. The results are in good agreement with the glass transitions detected by DSC for this process. The temperature dependences of the relaxation rates of the α1-, α2-, and α3-processes are all different. Therefore, different molecular assignments for the relaxation processes are proposed. In addition to the relaxation processes, a conductivity contribution was explored by BDS for both KAL compounds. The conductivity contribution appears in both Cry and Colh phases, where the conductivity increases by ca. 1 order of magnitude at phase transition from the Cry to the hexagonal phase.de_DE
tuhh.publisher.doi10.1021/acs.jpcb.0c06854-
tuhh.publication.instituteWerkstoffphysik und -technologie M-22de_DE
tuhh.publication.instituteCenter for Integrated Multiscale Material Systems M-2de_DE
tuhh.type.opus(wissenschaftlicher) Artikel-
dc.type.driverarticle-
dc.type.casraiJournal Article-
tuhh.container.issue39de_DE
tuhh.container.volume124de_DE
tuhh.container.startpage8728de_DE
tuhh.container.endpage8739de_DE
dc.identifier.pmid32902985de_DE
dc.identifier.scopus2-s2.0-85092680987de_DE
item.creatorOrcidYildirim, Arda-
item.creatorOrcidKolmangadi, Mohamed A.-
item.creatorOrcidBühlmeyer, Andrea-
item.creatorOrcidHuber, Patrick-
item.creatorOrcidLaschat, Sabine-
item.creatorOrcidSchönhals, Andreas-
item.openairetypeArticle-
item.openairecristypehttp://purl.org/coar/resource_type/c_6501-
item.fulltextNo Fulltext-
item.mappedtypeArticle-
item.creatorGNDYildirim, Arda-
item.creatorGNDKolmangadi, Mohamed A.-
item.creatorGNDBühlmeyer, Andrea-
item.creatorGNDHuber, Patrick-
item.creatorGNDLaschat, Sabine-
item.creatorGNDSchönhals, Andreas-
item.cerifentitytypePublications-
item.grantfulltextnone-
item.languageiso639-1en-
crisitem.author.deptMaterial- und Röntgenphysik M-2-
crisitem.author.orcid0000-0002-2126-9100-
crisitem.author.orcid0000-0002-1488-3903-
crisitem.author.orcid0000-0003-4330-9107-
crisitem.author.parentorgStudiendekanat Maschinenbau-
Appears in Collections:Publications without fulltext
Show simple item record

Page view(s)

45
Last Week
1
Last month
1
checked on Sep 25, 2021

SCOPUSTM   
Citations

2
Last Week
0
Last month
0
checked on Sep 25, 2021

Google ScholarTM

Check

Add Files to Item

Note about this record

Cite this record

Export

Items in TORE are protected by copyright, with all rights reserved, unless otherwise indicated.