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Water vapor sorptio...
Water vapor sorption-desorption hysteresis in glassy surface films of mucins investigated by humidity scanning QCM-D
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- Björklund, Sebastian (författare)
- Malmö universitet,Institutionen för biomedicinsk vetenskap (BMV),Biofilms Research Center for Biointerfaces
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- Kocherbitov, Vitaly (författare)
- Malmö universitet,Institutionen för biomedicinsk vetenskap (BMV),Biofilms Research Center for Biointerfaces
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(creator_code:org_t)
- Elsevier, 2019
- 2019
- Engelska.
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Ingår i: Journal of Colloid and Interface Science. - : Elsevier. - 0021-9797 .- 1095-7103. ; 545, s. 289-300
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- Hypothesis: Investigating the origin of water sorption-desorption hysteresis in glassy biopolymers is important for understanding the properties of biological barriers, such as the mucus epithelium. In general, hysteresis is a result of a complex interplay between diffusion of water and relaxation of the polymer matrix. Our hypothesis is that for thin films, typical for quartz crystal microbalance with dissipation monitoring (QCM-D) experiments performed in gas phase with defined relative humidity, the diffusion limitation is eliminated and hysteresis results only from relaxation of the polymer matrix. Experiments: We use a recently developed humidity scanning (HS) QCM-D method to obtain water sorption-desorption isotherms of mucin films under controlled conditions where water diffusion is not the limiting factor, neither in the vapor phase nor in the glassy mucin film. Findings: We present new results on the water sorption-desorption behavior of glassy mucin films with nanoscale thicknesses. Despite the fact that water diffusion is not the limiting factor, the sorption-desorption branches show clear hysteresis effects that are similar to those typically observed in bulk samples. The hydration-induced glass transition, resolved from monitoring the rheological behavior of the films, is shown to be in excellent agreement with the onset of the sorption-desorption hysteresis. We suggest that the hysteresis effect is related to a difference in dynamical and structural properties of the glassy materials depending on the hydration history of the films.
Nyckelord
- Relative humidity
- Water vapor pressure
- Glass
- Glass transition
- Relaxation
- Polymer dynamics
- Adsorption
- Sorption
- Desorption
- Isotherms
- Hysteresis
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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