Publikation:

Osmotic pressure and phase boundary determination of multiphase systems by analytical ultracentrifugation

Lade...
Vorschaubild

Dateien

Zu diesem Dokument gibt es keine Dateien.

Datum

2008

Autor:innen

Page, Miles G.
Zemb, Thomas
Dubois, Monique

Herausgeber:innen

Kontakt

ISSN der Zeitschrift

Electronic ISSN

ISBN

Bibliografische Daten

Verlag

Schriftenreihe

Auflagebezeichnung

ArXiv-ID

Internationale Patentnummer

Angaben zur Forschungsförderung

Projekt

Open Access-Veröffentlichung
Core Facility der Universität Konstanz

Gesperrt bis

Titel in einer weiteren Sprache

Publikationstyp
Zeitschriftenartikel
Publikationsstatus
Published

Erschienen in

ChemPhysChem. 2008, 9(6), pp. 882-890. ISSN 1439-4235. eISSN 1439-7641. Available under: doi: 10.1002/cphc.200700668

Zusammenfassung

We show that analytical ultracentrifugation can be applied to derive full equations of state of colloids in a single sedimentation equilibrium experiment, by determination of single-phase boundaries as well as of osmotic pressure versus concentration at fixed temperatures. A continuous dependence of the osmotic pressure, over orders of magnitude between at least ∼101 and 104 Pa, and a wide concentration range, are determined in agreement with standard theoretical considerations. Two model experimental colloidal systems are investigated: For a well-known synthetic clay system (laponite), it is shown that two regimes—counter-ion ideal gas and interacting double layers—can easily be identified in the equation of state, whereas metastable glass- or microphase-separated gel states previously encountered in osmotic stress measurements of laponite are circumvented. For the case of rigid, crystallized catanionic bilayers, single phase domains can be identified. Osmotic pressure results in this case disagree with results obtained using the classical osmotic stress technique, as a result of sample adhesion to the ultracentrifuge cell windows and uncertainty due to possible micromolar ion contamination.

Zusammenfassung in einer weiteren Sprache

Fachgebiet (DDC)
540 Chemie

Schlagwörter

clays, equation of state, osmotic pressure, phase transitions, sedimentation equilibrium

Konferenz

Rezension
undefined / . - undefined, undefined

Forschungsvorhaben

Organisationseinheiten

Zeitschriftenheft

Zugehörige Datensätze in KOPS

Zitieren

ISO 690PAGE, Miles G., Thomas ZEMB, Monique DUBOIS, Helmut CÖLFEN, 2008. Osmotic pressure and phase boundary determination of multiphase systems by analytical ultracentrifugation. In: ChemPhysChem. 2008, 9(6), pp. 882-890. ISSN 1439-4235. eISSN 1439-7641. Available under: doi: 10.1002/cphc.200700668
BibTex
@article{Page2008-04-21Osmot-16652,
  year={2008},
  doi={10.1002/cphc.200700668},
  title={Osmotic pressure and phase boundary determination of multiphase systems by analytical ultracentrifugation},
  number={6},
  volume={9},
  issn={1439-4235},
  journal={ChemPhysChem},
  pages={882--890},
  author={Page, Miles G. and Zemb, Thomas and Dubois, Monique and Cölfen, Helmut}
}
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/123456789/16652">
    <dcterms:rights rdf:resource="https://rightsstatements.org/page/InC/1.0/"/>
    <dc:language>eng</dc:language>
    <dc:date rdf:datatype="http://www.w3.org/2001/XMLSchema#dateTime">2011-11-09T11:04:00Z</dc:date>
    <bibo:uri rdf:resource="http://kops.uni-konstanz.de/handle/123456789/16652"/>
    <dc:creator>Dubois, Monique</dc:creator>
    <dc:creator>Cölfen, Helmut</dc:creator>
    <dc:contributor>Zemb, Thomas</dc:contributor>
    <dcterms:available rdf:datatype="http://www.w3.org/2001/XMLSchema#dateTime">2011-11-09T11:04:00Z</dcterms:available>
    <dc:creator>Page, Miles G.</dc:creator>
    <dc:creator>Zemb, Thomas</dc:creator>
    <dcterms:abstract xml:lang="eng">We show that analytical ultracentrifugation can be applied to derive full equations of state of colloids in a single sedimentation equilibrium experiment, by determination of single-phase boundaries as well as of osmotic pressure versus concentration at fixed temperatures. A continuous dependence of the osmotic pressure, over orders of magnitude between at least ∼101 and 104 Pa, and a wide concentration range, are determined in agreement with standard theoretical considerations. Two model experimental colloidal systems are investigated: For a well-known synthetic clay system (laponite), it is shown that two regimes—counter-ion ideal gas and interacting double layers—can easily be identified in the equation of state, whereas metastable glass- or microphase-separated gel states previously encountered in osmotic stress measurements of laponite are circumvented. For the case of rigid, crystallized catanionic bilayers, single phase domains can be identified. Osmotic pressure results in this case disagree with results obtained using the classical osmotic stress technique, as a result of sample adhesion to the ultracentrifuge cell windows and uncertainty due to possible micromolar ion contamination.</dcterms:abstract>
    <foaf:homepage rdf:resource="http://localhost:8080/"/>
    <dc:contributor>Cölfen, Helmut</dc:contributor>
    <dcterms:isPartOf rdf:resource="https://kops.uni-konstanz.de/server/rdf/resource/123456789/29"/>
    <void:sparqlEndpoint rdf:resource="http://localhost/fuseki/dspace/sparql"/>
    <dcterms:title>Osmotic pressure and phase boundary determination of multiphase systems by analytical ultracentrifugation</dcterms:title>
    <dcterms:bibliographicCitation>Publ. in: ChemPhysChem ; 9 (2008), 6. - S. 882–890</dcterms:bibliographicCitation>
    <dc:contributor>Dubois, Monique</dc:contributor>
    <dspace:isPartOfCollection rdf:resource="https://kops.uni-konstanz.de/server/rdf/resource/123456789/29"/>
    <dcterms:issued>2008-04-21</dcterms:issued>
    <dc:rights>terms-of-use</dc:rights>
    <dc:contributor>Page, Miles G.</dc:contributor>
  </rdf:Description>
</rdf:RDF>

Interner Vermerk

xmlui.Submission.submit.DescribeStep.inputForms.label.kops_note_fromSubmitter

Kontakt
URL der Originalveröffentl.

Prüfdatum der URL

Prüfungsdatum der Dissertation

Finanzierungsart

Kommentar zur Publikation

Allianzlizenz
Corresponding Authors der Uni Konstanz vorhanden
Internationale Co-Autor:innen
Universitätsbibliographie
Nein
Begutachtet
Diese Publikation teilen