Calorimetric evidence for a mobile surface layer in ultrathin polymeric films: poly(2-vinyl pyridine)

dc.contributor.authorMadkour, Sherif
dc.contributor.authorYin, Huajie
dc.contributor.authorFüllbrandt, Marieke
dc.contributor.authorSchönhals, Andreas
dc.date.accessioned2017-10-25T06:24:58Z
dc.date.available2017-10-25T06:24:58Z
dc.date.issued2015
dc.descriptionDieser Beitrag ist mit Zustimmung des Rechteinhabers aufgrund einer (DFG geförderten) Allianz- bzw. Nationallizenz frei zugänglich.de
dc.descriptionThis publication is with permission of the rights owner freely accessible due to an Alliance licence and a national licence (funded by the DFG, German Research Foundation) respectively.en
dc.description.abstractSpecific heat spectroscopy was used to study the dynamic glass transition of ultrathin poly(2-vinyl pyridine) films (thicknesses: 405-10 nm). The amplitude and the phase angle of the differential voltage were obtained as a measure of the complex heat capacity. In a traditional data analysis, the dynamic glass transition temperature T-g is estimated from the phase angle. These data showed no thickness dependency on T-g down to 22 nm (error of the measurement of +/- 3 K). A derivative-based method was established, evidencing a decrease in T-g with decreasing thickness up to 7 K, which can be explained by a surface layer. For ultrathin films, data showed broadening at the lower temperature side of the spectra, supporting the existence of a surface layer. Finally, temperature dependence of the heat capacity in the glassy and liquid states changes with film thickness, which can be considered as a confinement effect.en
dc.description.sponsorshipDFG, Scho-470/20-1, Template confinement effects on discotic liquid-crystalsen
dc.identifier.eissn1744-6848
dc.identifier.issn1744-683X
dc.identifier.pmid26324951
dc.identifier.urihttps://depositonce.tu-berlin.de//handle/11303/6937
dc.identifier.urihttp://dx.doi.org/10.14279/depositonce-6276
dc.language.isoen
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/
dc.subject.ddc530 Physikde
dc.titleCalorimetric evidence for a mobile surface layer in ultrathin polymeric films: poly(2-vinyl pyridine)en
dc.typeArticleen
dc.type.versionpublishedVersionen
dcterms.bibliographicCitation.doi10.1039/c5sm01558h
dcterms.bibliographicCitation.issue40
dcterms.bibliographicCitation.journaltitleSoft matteren
dcterms.bibliographicCitation.originalpublishernameRoyal Society of Chemistryde
dcterms.bibliographicCitation.originalpublisherplaceCambridgede
dcterms.bibliographicCitation.pageend7952
dcterms.bibliographicCitation.pagestart7942
dcterms.bibliographicCitation.volume11
tub.accessrights.dnbdomain
tub.affiliationFak. 2 Mathematik und Naturwissenschaften>Inst. Chemiede
tub.affiliation.facultyFak. 2 Mathematik und Naturwissenschaftende
tub.affiliation.instituteInst. Chemiede
tub.publisher.universityorinstitutionTechnische Universität Berlin
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