Oscillating modes of driven colloids in overdamped systems

Berner, Johannes; Müller, Boris; Gomez Solano, Juan Ruben; Krüger, Matthias; Bechinger, Clemens

Oscillating modes of driven colloids in overdamped systems

Dateien

Berner_-2-iuzptt9mdin64.pdfGröße: 1.08 MBDownloads: 349

Datum

2018

Autor:innen

Berner, Johannes

Müller, Boris

Gomez Solano, Juan Ruben

Krüger, Matthias

Bechinger, Clemens

Angaben zur Forschungsförderung

European Union (EU): 693683

Projekt

Suspensions with Controlled Interaction Rules ASCIR

Open Access-Veröffentlichung

Open Access Gold

Sammlungen

Physik

Publikationstyp

Zeitschriftenartikel

Publikationsstatus

Published

Erschienen in

Nature Communications. 2018, 9(1), 999. eISSN 2041-1723. Available under: doi: 10.1038/s41467-018-03345-2

Zusammenfassung

Microscopic colloidal particles suspended in liquids are a prominent example of an overdamped system where viscous forces dominate over inertial effects. Frequently, colloids are used as sensitive probes, e.g., in biophysical applications from which molecular forces are inferred. The interpretation of such experiments rests on the assumption that, even when the particles are driven, the liquid remains in equilibrium. Here we experimentally demonstrate that this is not valid for particles in viscoelastic fluids. Even at small driving forces, we observe particle oscillations with several tens of seconds. They are attributed to non-equilibrium fluctuations of the fluid being excited by the particle’s motion. The oscillatory dynamics is in quantitative agreement with an overdamped Langevin equation with negative friction-memory term being equivalent to a stochastically driven underdamped oscillator. Such oscillatory modes are expected to widen the use of colloids as model systems but must also be considered in colloidal probe experiments.

Fachgebiet (DDC)

530 Physik

Zitieren

ISO 690

BERNER, Johannes, Boris MÜLLER, Juan Ruben GOMEZ SOLANO, Matthias KRÜGER, Clemens BECHINGER, 2018. Oscillating modes of driven colloids in overdamped systems. In: Nature Communications. 2018, 9(1), 999. eISSN 2041-1723. Available under: doi: 10.1038/s41467-018-03345-2

BibTex

@article{Berner2018Oscil-41781,
  year={2018},
  doi={10.1038/s41467-018-03345-2},
  title={Oscillating modes of driven colloids in overdamped systems},
  number={1},
  volume={9},
  journal={Nature Communications},
  author={Berner, Johannes and Müller, Boris and Gomez Solano, Juan Ruben and Krüger, Matthias and Bechinger, Clemens},
  note={Article Number: 999}
}

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/123456789/41781">
    <dcterms:hasPart rdf:resource="https://kops.uni-konstanz.de/bitstream/123456789/41781/3/Berner_-2-iuzptt9mdin64.pdf"/>
    <dcterms:available rdf:datatype="http://www.w3.org/2001/XMLSchema#dateTime">2018-03-14T10:46:28Z</dcterms:available>
    <dspace:isPartOfCollection rdf:resource="https://kops.uni-konstanz.de/server/rdf/resource/123456789/41"/>
    <dc:language>eng</dc:language>
    <dc:creator>Berner, Johannes</dc:creator>
    <dcterms:rights rdf:resource="http://creativecommons.org/licenses/by/4.0/"/>
    <dcterms:issued>2018</dcterms:issued>
    <dcterms:isPartOf rdf:resource="https://kops.uni-konstanz.de/server/rdf/resource/123456789/41"/>
    <dc:contributor>Berner, Johannes</dc:contributor>
    <void:sparqlEndpoint rdf:resource="http://localhost/fuseki/dspace/sparql"/>
    <dc:creator>Krüger, Matthias</dc:creator>
    <dcterms:abstract xml:lang="eng">Microscopic colloidal particles suspended in liquids are a prominent example of an overdamped system where viscous forces dominate over inertial effects. Frequently, colloids are used as sensitive probes, e.g., in biophysical applications from which molecular forces are inferred. The interpretation of such experiments rests on the assumption that, even when the particles are driven, the liquid remains in equilibrium. Here we experimentally demonstrate that this is not valid for particles in viscoelastic fluids. Even at small driving forces, we observe particle oscillations with several tens of seconds. They are attributed to non-equilibrium fluctuations of the fluid being excited by the particle’s motion. The oscillatory dynamics is in quantitative agreement with an overdamped Langevin equation with negative friction-memory term being equivalent to a stochastically driven underdamped oscillator. Such oscillatory modes are expected to widen the use of colloids as model systems but must also be considered in colloidal probe experiments.</dcterms:abstract>
    <dc:date rdf:datatype="http://www.w3.org/2001/XMLSchema#dateTime">2018-03-14T10:46:28Z</dc:date>
    <foaf:homepage rdf:resource="http://localhost:8080/"/>
    <dspace:hasBitstream rdf:resource="https://kops.uni-konstanz.de/bitstream/123456789/41781/3/Berner_-2-iuzptt9mdin64.pdf"/>
    <dc:creator>Bechinger, Clemens</dc:creator>
    <dc:contributor>Krüger, Matthias</dc:contributor>
    <dcterms:title>Oscillating modes of driven colloids in overdamped systems</dcterms:title>
    <dc:creator>Müller, Boris</dc:creator>
    <dc:contributor>Müller, Boris</dc:contributor>
    <dc:contributor>Gomez Solano, Juan Ruben</dc:contributor>
    <dc:rights>Attribution 4.0 International</dc:rights>
    <dc:contributor>Bechinger, Clemens</dc:contributor>
    <dc:creator>Gomez Solano, Juan Ruben</dc:creator>
    <bibo:uri rdf:resource="https://kops.uni-konstanz.de/handle/123456789/41781"/>
  </rdf:Description>
</rdf:RDF>

Universitätsbibliographie

Ja

Begutachtet

Ja