Nanocrystal Surface Structure Analysis by Analytical Ultracentrifugation

Cölfen, Helmut; Tirosh, Shay; Zaban, Arie

Nanocrystal Surface Structure Analysis by Analytical Ultracentrifugation

Dateien

Zu diesem Dokument gibt es keine Dateien.

Datum

2003

Autor:innen

Cölfen, Helmut

Tirosh, Shay

Zaban, Arie

DOI (zitierfähiger Link)

10.1021/la0347051

Sammlungen

Chemie

Publikationstyp

Zeitschriftenartikel

Publikationsstatus

Published

Erschienen in

Langmuir ; 19 (2003), 26. - S. 10654-10659. - ISSN 0743-7463. - eISSN 1520-5827

Zusammenfassung

Sedimentation velocity experiments on two TiO₂ model colloids with similar properties but different surface structures were performed as a function of the solution pH in order to differentiate between similar size particles. The particle sedimentation velocity is highly sensitive to the surface structure, which is indicative of the exposed crystal face of the nanocrystals. Increase of the pH from 1 to 3 resulted in aggregation of all particles in one sample, whereas only partial aggregation occurred for the other, although the ζ-potential of both samples is almost identical in that pH range indicating particle stability. Although the particles are not distinguishable by the conventional methods for particle charge determination, they are clearly different in terms of their sedimentation coefficient distributions. Furthermore, analytical ultracentrifugation (AUC) reveals a dependence of the onset of large aggregate formation on the particle surface. This suggests that AUC has the potential to quantitatively determine differences in the particle surface structure even for polydisperse samples with constant average charge where conventional ζ-potential measurements yield only a constant average value. As ultracentrifugation yields distributions, we further discuss whether a combination with a second independent method like flow-field-flow fractionation can yield particle size and charge distributions in a global analysis approach.

Fachgebiet (DDC)

540 Chemie

Zitieren

ISO 690

CÖLFEN, Helmut, Shay TIROSH, Arie ZABAN, 2003. Nanocrystal Surface Structure Analysis by Analytical Ultracentrifugation. In: Langmuir. 19(26), pp. 10654-10659. ISSN 0743-7463. eISSN 1520-5827. Available under: doi: 10.1021/la0347051

BibTex

@article{Colfen2003-12Nanoc-40213,
  year={2003},
  doi={10.1021/la0347051},
  title={Nanocrystal Surface Structure Analysis by Analytical Ultracentrifugation},
  number={26},
  volume={19},
  issn={0743-7463},
  journal={Langmuir},
  pages={10654--10659},
  author={Cölfen, Helmut and Tirosh, Shay and Zaban, Arie}
}

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/123456789/40213">
    <dcterms:title>Nanocrystal Surface Structure Analysis by Analytical Ultracentrifugation</dcterms:title>
    <dcterms:isPartOf rdf:resource="https://kops.uni-konstanz.de/server/rdf/resource/123456789/29"/>
    <dcterms:abstract xml:lang="eng">Sedimentation velocity experiments on two TiO&lt;sub&gt;2&lt;/sub&gt; model colloids with similar properties but different surface structures were performed as a function of the solution pH in order to differentiate between similar size particles. The particle sedimentation velocity is highly sensitive to the surface structure, which is indicative of the exposed crystal face of the nanocrystals. Increase of the pH from 1 to 3 resulted in aggregation of all particles in one sample, whereas only partial aggregation occurred for the other, although the ζ-potential of both samples is almost identical in that pH range indicating particle stability. Although the particles are not distinguishable by the conventional methods for particle charge determination, they are clearly different in terms of their sedimentation coefficient distributions. Furthermore, analytical ultracentrifugation (AUC) reveals a dependence of the onset of large aggregate formation on the particle surface. This suggests that AUC has the potential to quantitatively determine differences in the particle surface structure even for polydisperse samples with constant average charge where conventional ζ-potential measurements yield only a constant average value. As ultracentrifugation yields distributions, we further discuss whether a combination with a second independent method like flow-field-flow fractionation can yield particle size and charge distributions in a global analysis approach.</dcterms:abstract>
    <dc:date rdf:datatype="http://www.w3.org/2001/XMLSchema#dateTime">2017-09-30T12:41:51Z</dc:date>
    <dc:creator>Cölfen, Helmut</dc:creator>
    <void:sparqlEndpoint rdf:resource="http://localhost/fuseki/dspace/sparql"/>
    <dc:contributor>Tirosh, Shay</dc:contributor>
    <dc:contributor>Zaban, Arie</dc:contributor>
    <bibo:uri rdf:resource="https://kops.uni-konstanz.de/handle/123456789/40213"/>
    <dc:language>eng</dc:language>
    <foaf:homepage rdf:resource="http://localhost:8080/"/>
    <dcterms:available rdf:datatype="http://www.w3.org/2001/XMLSchema#dateTime">2017-09-30T12:41:51Z</dcterms:available>
    <dcterms:issued>2003-12</dcterms:issued>
    <dc:creator>Tirosh, Shay</dc:creator>
    <dc:creator>Zaban, Arie</dc:creator>
    <dspace:isPartOfCollection rdf:resource="https://kops.uni-konstanz.de/server/rdf/resource/123456789/29"/>
    <dc:contributor>Cölfen, Helmut</dc:contributor>
  </rdf:Description>
</rdf:RDF>

Universitätsbibliographie

Nein