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Title: Humidity scanning quartz crystal microbalance with dissipation monitoring setup for determination of sorption-desorption isotherms and rheological changes

Abstract

A new method to determine water sorption-desorption isotherms with high resolution in the complete range of water activities (relative humidities) is presented. The method is based on quartz crystal microbalance with dissipation monitoring (QCM-D). The QCM-D is equipped with a humidity module in which the sample film is kept in air with controlled humidity. The experimental setup allows for continuous scanning of the relative humidity from either dry to humid conditions or vice versa. The amount of water sorbed or desorbed from the sample is determined from the resonance frequencies of the coated quartz sensor, via analysis of the overtone dependence. In addition, the method allows for characterization of hydration induced changes of the rheological properties from the dissipation data, which is closely connected to the viscoelasticity of the film. The accuracy of the humidity scanning setup is confirmed in control experiments. Sorption-desorption isotherms of pig gastric mucin and lysozyme, obtained by the new method, show good agreement with previous results. Finally, we show that the deposition technique used to coat the quartz sensor influences the QCM-D data and how this issue can be used to obtain further information on the effect of hydration. In particular, we demonstrate that spin-coatingmore » represents an attractive alternative to obtain sorption-desorption isotherms, while drop-coating provides additional information on changes of the rheological properties during hydration.« less

Authors:
;  [1];  [2]
  1. Department of Biomedical Science, Faculty of Health and Society, Malmö University, Malmö (Sweden)
  2. (Sweden)
Publication Date:
OSTI Identifier:
22392515
Resource Type:
Journal Article
Journal Name:
Review of Scientific Instruments
Additional Journal Information:
Journal Volume: 86; Journal Issue: 5; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0034-6748
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; ACCURACY; CRYSTALS; DESORPTION; FILMS; HUMIDITY; HYDRATION; ISOTHERMS; LYSOZYME; MICROBALANCES; QUARTZ; SENSORS; SPIN-ON COATING

Citation Formats

Björklund, Sebastian, E-mail: sebastianbjorklund@gmail.com, Kocherbitov, Vitaly, and Biofilms—Research Center for Biointerfaces, Malmö University, Malmö. Humidity scanning quartz crystal microbalance with dissipation monitoring setup for determination of sorption-desorption isotherms and rheological changes. United States: N. p., 2015. Web. doi:10.1063/1.4920919.
Björklund, Sebastian, E-mail: sebastianbjorklund@gmail.com, Kocherbitov, Vitaly, & Biofilms—Research Center for Biointerfaces, Malmö University, Malmö. Humidity scanning quartz crystal microbalance with dissipation monitoring setup for determination of sorption-desorption isotherms and rheological changes. United States. doi:10.1063/1.4920919.
Björklund, Sebastian, E-mail: sebastianbjorklund@gmail.com, Kocherbitov, Vitaly, and Biofilms—Research Center for Biointerfaces, Malmö University, Malmö. Fri . "Humidity scanning quartz crystal microbalance with dissipation monitoring setup for determination of sorption-desorption isotherms and rheological changes". United States. doi:10.1063/1.4920919.
@article{osti_22392515,
title = {Humidity scanning quartz crystal microbalance with dissipation monitoring setup for determination of sorption-desorption isotherms and rheological changes},
author = {Björklund, Sebastian, E-mail: sebastianbjorklund@gmail.com and Kocherbitov, Vitaly and Biofilms—Research Center for Biointerfaces, Malmö University, Malmö},
abstractNote = {A new method to determine water sorption-desorption isotherms with high resolution in the complete range of water activities (relative humidities) is presented. The method is based on quartz crystal microbalance with dissipation monitoring (QCM-D). The QCM-D is equipped with a humidity module in which the sample film is kept in air with controlled humidity. The experimental setup allows for continuous scanning of the relative humidity from either dry to humid conditions or vice versa. The amount of water sorbed or desorbed from the sample is determined from the resonance frequencies of the coated quartz sensor, via analysis of the overtone dependence. In addition, the method allows for characterization of hydration induced changes of the rheological properties from the dissipation data, which is closely connected to the viscoelasticity of the film. The accuracy of the humidity scanning setup is confirmed in control experiments. Sorption-desorption isotherms of pig gastric mucin and lysozyme, obtained by the new method, show good agreement with previous results. Finally, we show that the deposition technique used to coat the quartz sensor influences the QCM-D data and how this issue can be used to obtain further information on the effect of hydration. In particular, we demonstrate that spin-coating represents an attractive alternative to obtain sorption-desorption isotherms, while drop-coating provides additional information on changes of the rheological properties during hydration.},
doi = {10.1063/1.4920919},
journal = {Review of Scientific Instruments},
issn = {0034-6748},
number = 5,
volume = 86,
place = {United States},
year = {2015},
month = {5}
}