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Formation, chemical composition, and structure of polyelectrolyte-nanoparticle multilayer films
RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, YKI – Ytkemiska institutet.
2002 (Engelska)Ingår i: Langmuir, ISSN 0743-7463, E-ISSN 1520-5827, Vol. 18, s. 6410-6415Artikel i tidskrift (Refereegranskat)
Abstract [en]

The buildup and structure of multilayer films containing cationic polyelectrolyte and silica nanoparticles have been studied by means of ellipsometry, atomic force microscopy, and X-ray photoelectron spectroscopy. Emphasis was placed on the effect of ionic strength on the adsorption behavior and structure formation. Consecutive exposure of a silica substrate to low ionic strength solutions containing polyelectrolyte and nanoparticles resulted in the formation of stable adsorbed films with a reproducible stratified multilayer structure. The films formed in high ionic strength solutions were initially much thicker but also clearly less stable. A significant desorption was observed to take place in conjunction with the second exposure to silica nanoparticles. The effect of electrolyte concentration is discussed in terms of a salt-induced glass-liquid transition, above which the relaxation rate in the adsorbed composite film increases and thereby hinders the formation of multilayer structures

Ort, förlag, år, upplaga, sidor
2002. Vol. 18, s. 6410-6415
Nationell ämneskategori
Naturvetenskap
Identifikatorer
URN: urn:nbn:se:ri:diva-27207OAI: oai:DiVA.org:ri-27207DiVA, id: diva2:1054211
Anmärkning
A1596Tillgänglig från: 2016-12-08 Skapad: 2016-12-08 Senast uppdaterad: 2020-12-01Bibliografiskt granskad

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