Viscoelastic properties and efficient acoustic damping in confined polymer nano-layers at GHz frequencies
Viscoelastic properties and efficient acoustic damping in confined polymer nano-layers at GHz frequencies
Datum
2016
Autor:innen
Jacob, Karl
Gusev, Vitalyi
Herausgeber:innen
ISSN der Zeitschrift
eISSN
item.preview.dc.identifier.isbn
Bibliografische Daten
Verlag
Schriftenreihe
URI (zitierfähiger Link)
DOI (zitierfähiger Link)
Internationale Patentnummer
Link zur Lizenz
EU-Projektnummer
Projekt
Open Access-Veröffentlichung
Sammlungen
Titel in einer weiteren Sprache
Publikationstyp
Zeitschriftenartikel
Publikationsstatus
Published
Erschienen in
Scientific Reports ; 6 (2016). - 33471. - eISSN 2045-2322
Zusammenfassung
We investigate the viscoelastic properties of confined molecular nano-layers by time resolved optical pump-probe measurements. Access to the elastic properties is provided by the damping time of acoustic eigenmodes of thin metal films deposited on the molecular nano-layers which show a strong dependence on the molecular layer thickness and on the acoustic eigen-mode frequencies. An analytical model including the viscoelastic properties of the molecular layer allows us to obtain the longitudinal sound velocity as well as the acoustic absorption coefficient of the layer. Our experiments and theoretical analysis indicate for the first time that the molecular nano-layers are much more viscous than elastic in the investigated frequency range from 50 to 120 GHz and thus show pronounced acoustic absorption. The longitudinal acoustic wavenumber has nearly equal real and imaginary parts, both increasing proportional to the square root of the frequency. Thus, both acoustic velocity and acoustic absorption are proportional to the square root of frequency and the propagation of compressional/dilatational acoustic waves in the investigated nano-layers is of the diffusional type, similar to the propagation of shear waves in viscous liquids and thermal waves in solids.
Zusammenfassung in einer weiteren Sprache
Fachgebiet (DDC)
530 Physik
Schlagwörter
Coherent Phonons, Picosecond Ultrasonics, Viscoelasticity, Polymers
Konferenz
Rezension
undefined / . - undefined, undefined. - (undefined; undefined)
Zitieren
ISO 690
HETTICH, Mike, Karl JACOB, Oliver RISTOW, Martin SCHUBERT, Axel BRUCHHAUSEN, Vitalyi GUSEV, Thomas DEKORSY, 2016. Viscoelastic properties and efficient acoustic damping in confined polymer nano-layers at GHz frequencies. In: Scientific Reports. 6, 33471. eISSN 2045-2322. Available under: doi: 10.1038/srep33471BibTex
@article{Hettich2016-09-16Visco-35372, year={2016}, doi={10.1038/srep33471}, title={Viscoelastic properties and efficient acoustic damping in confined polymer nano-layers at GHz frequencies}, volume={6}, journal={Scientific Reports}, author={Hettich, Mike and Jacob, Karl and Ristow, Oliver and Schubert, Martin and Bruchhausen, Axel and Gusev, Vitalyi and Dekorsy, Thomas}, note={Article Number: 33471} }
RDF
<rdf:RDF xmlns:dcterms="http://purl.org/dc/terms/" xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" xmlns:bibo="http://purl.org/ontology/bibo/" xmlns:dspace="http://digital-repositories.org/ontologies/dspace/0.1.0#" xmlns:foaf="http://xmlns.com/foaf/0.1/" xmlns:void="http://rdfs.org/ns/void#" xmlns:xsd="http://www.w3.org/2001/XMLSchema#" > <rdf:Description rdf:about="https://kops.uni-konstanz.de/server/rdf/resource/123456789/35372"> <dc:language>eng</dc:language> <dspace:isPartOfCollection rdf:resource="https://kops.uni-konstanz.de/server/rdf/resource/123456789/41"/> <dc:creator>Ristow, Oliver</dc:creator> <dc:contributor>Gusev, Vitalyi</dc:contributor> <dc:creator>Dekorsy, Thomas</dc:creator> <dcterms:hasPart rdf:resource="https://kops.uni-konstanz.de/bitstream/123456789/35372/1/Hettich_0-363803.pdf"/> <dcterms:abstract xml:lang="eng">We investigate the viscoelastic properties of confined molecular nano-layers by time resolved optical pump-probe measurements. Access to the elastic properties is provided by the damping time of acoustic eigenmodes of thin metal films deposited on the molecular nano-layers which show a strong dependence on the molecular layer thickness and on the acoustic eigen-mode frequencies. An analytical model including the viscoelastic properties of the molecular layer allows us to obtain the longitudinal sound velocity as well as the acoustic absorption coefficient of the layer. Our experiments and theoretical analysis indicate for the first time that the molecular nano-layers are much more viscous than elastic in the investigated frequency range from 50 to 120 GHz and thus show pronounced acoustic absorption. The longitudinal acoustic wavenumber has nearly equal real and imaginary parts, both increasing proportional to the square root of the frequency. Thus, both acoustic velocity and acoustic absorption are proportional to the square root of frequency and the propagation of compressional/dilatational acoustic waves in the investigated nano-layers is of the diffusional type, similar to the propagation of shear waves in viscous liquids and thermal waves in solids.</dcterms:abstract> <dc:creator>Gusev, Vitalyi</dc:creator> <void:sparqlEndpoint rdf:resource="http://localhost/fuseki/dspace/sparql"/> <dc:contributor>Jacob, Karl</dc:contributor> <foaf:homepage rdf:resource="http://localhost:8080/"/> <dc:contributor>Bruchhausen, Axel</dc:contributor> <dspace:hasBitstream rdf:resource="https://kops.uni-konstanz.de/bitstream/123456789/35372/1/Hettich_0-363803.pdf"/> <dc:creator>Schubert, Martin</dc:creator> <dcterms:available rdf:datatype="http://www.w3.org/2001/XMLSchema#dateTime">2016-09-21T11:19:30Z</dcterms:available> <dc:rights>Attribution 4.0 International</dc:rights> <dcterms:rights rdf:resource="http://creativecommons.org/licenses/by/4.0/"/> <dc:contributor>Dekorsy, Thomas</dc:contributor> <dc:creator>Hettich, Mike</dc:creator> <dc:creator>Bruchhausen, Axel</dc:creator> <bibo:uri rdf:resource="https://kops.uni-konstanz.de/handle/123456789/35372"/> <dc:creator>Jacob, Karl</dc:creator> <dcterms:isPartOf rdf:resource="https://kops.uni-konstanz.de/server/rdf/resource/123456789/41"/> <dc:contributor>Schubert, Martin</dc:contributor> <dc:date rdf:datatype="http://www.w3.org/2001/XMLSchema#dateTime">2016-09-21T11:19:30Z</dc:date> <dc:contributor>Ristow, Oliver</dc:contributor> <dcterms:issued>2016-09-16</dcterms:issued> <dc:contributor>Hettich, Mike</dc:contributor> <dcterms:title>Viscoelastic properties and efficient acoustic damping in confined polymer nano-layers at GHz frequencies</dcterms:title> </rdf:Description> </rdf:RDF>
Interner Vermerk
xmlui.Submission.submit.DescribeStep.inputForms.label.kops_note_fromSubmitter
Prüfungsdatum der Dissertation
Finanzierungsart
Kommentar zur Publikation
Allianzlizenz
Corresponding Authors der Uni Konstanz vorhanden
Internationale Co-Autor:innen
Universitätsbibliographie
Ja