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Quartz Crystal Microbalance with Dissipation (QCM-D) studies of the viscoelastic response from a continuously growing grafted polyelectrolyte layer
KTH, Skolan för kemivetenskap (CHE), Kemi, Yt- och korrosionsvetenskap.
KTH, Skolan för kemivetenskap (CHE), Kemi, Yt- och korrosionsvetenskap.
KTH, Skolan för kemivetenskap (CHE), Kemi, Yt- och korrosionsvetenskap.ORCID-id: 0000-0002-2288-819X
2013 (Engelska)Ingår i: Journal of Colloid and Interface Science, ISSN 0021-9797, E-ISSN 1095-7103, Vol. 408, s. 229-234Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Poly(acrylic acid) was grown from substrates by photopolymerization, and the grafting process was monitored in situ by Quartz Crystal Microbalance with Dissipation (QCM-D) measurements in a 1:1 v/v mixture of water/ethanol. The polymerization process was monitored into the thick film region, where the change in frequency and dissipation with increasing film mass changes sign as predicted by the Voigt viscoelastic model. Our experimental data are compared with predictions of this model, and satisfactory agreement is found for low overtone numbers. The Voigt model was applied to analyze the measured changes in frequency, Delta f, and dissipation, Delta D, in order to extract information on layer thickness, shear elasticity, mu, and shear viscosity, eta, of the growing film. The increasing rate of changes in Delta f and Delta D observed after about 150 s of polymerization was found to correlate with an increasing growth rate of the film thickness. For longer polymerization times a close to linear increase in thickness with time was observed. The sensitivity, defined as the derivatives of Delta f and Delta D with respect to thickness, depends on overtone number and is different for the frequency and dissipation signals - facts that should be considered when investigating small changes in thick films used in e.g. sensor applications.

Ort, förlag, år, upplaga, sidor
2013. Vol. 408, s. 229-234
Nyckelord [en]
Quartz Crystal Microbalance, QCM-D, Viscoelastic model, Voigt model, Grafting from, Iniferter, Poly(acrylic acid)
Nationell ämneskategori
Fysikalisk kemi
Identifikatorer
URN: urn:nbn:se:kth:diva-129436DOI: 10.1016/j.jcis.2013.07.008ISI: 000323989900033Scopus ID: 2-s2.0-84885182597OAI: oai:DiVA.org:kth-129436DiVA, id: diva2:652964
Forskningsfinansiär
Stiftelsen för strategisk forskning (SSF)Vinnova, P38574-1
Anmärkning

QC 20131002

Tillgänglig från: 2013-10-02 Skapad: 2013-09-30 Senast uppdaterad: 2017-12-06Bibliografiskt granskad

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Dunér, GunnarThormann, EsbenDédinaité, Andra
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