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Probing Differential Hydration of Poly(vinylpyrrolidone) Thin Films Using Tracer Mobility: An Insight from Fluorescence Correlation Spectroscopy

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Title Probing Differential Hydration of Poly(vinylpyrrolidone) Thin Films Using Tracer Mobility: An Insight from Fluorescence Correlation Spectroscopy
 
Creator BHATTACHARYA, S
DEY, A
CHOWDHURY, A
 
Subject GLASS-TRANSITION TEMPERATURE
SINGLE-MOLECULE SPECTROSCOPY
SPIN-COATED POLYSTYRENE
WATER-VAPOR ABSORPTION
POLYMER-FILMS
SOLVENT RETENTION
TRANSLATIONAL DIFFUSION
SUPERCOOLED LIQUIDS
HOMOPOLYMER FILMS
DYNAMICS
 
Description Dynamics of small probe molecules have been routinely used to unravel the intrinsic details of charged ion transport in polymer brushes and polyelectrolyte multilayer (PEM) thin films. However, corresponding morphological properties affected with absorption of moisture have been hardly dealt with despite numerous applications of isotropic thin films in material chemistry and medical purposes. We have explored the overall structural changes associated with plasticization of PVP thin films by probing dynamics of small reporter (rhodamine 6G, Rh6G) molecules using fluorescence correlation spectroscopy (FCS). It was observed that under lesser amounts of absorbed moisture, the rigidity of the film matrix was high enough to inhibit appreciable molecular mobility. Nonetheless, with gradual increase in the moisture level within the film, molecular movement became extremely facile, so much so that it almost attained close to a solution like state. Molecular mobility was found to be dependent on both the method of preparation and the thickness of the thin films. The diffusivities mostly followed anomalous subdiffusive behaviors, reminiscent of dynamics of tracers in crowded cellular environments. The mobility was found to be independent of any electrostatic interaction between probe and polymer thin film. Hence, the tracer dynamics was attributed most likely to the viscoelasticity of the thin film matrix.
 
Publisher AMER CHEMICAL SOC
 
Date 2014-12-29T05:47:59Z
2014-12-29T05:47:59Z
2014
 
Type Article
 
Identifier JOURNAL OF PHYSICAL CHEMISTRY B, 118(19)5240-5249
1520-6106
http://dx.doi.org/10.1021/jp409563k
http://dspace.library.iitb.ac.in/jspui/handle/100/17232
 
Language English