Quantification of Polymer–Surface Interaction Using Microcalorimetry

Isothermal titration microcalorimetry experiments are performed to measure the heat of adsorption of poly­(ethylene glycol) (PEG) on nonporous silica nanoparticles. A calorimetric technique is also developed for the determination of the adsorption isotherm for the PEG–silica system. A model based on...

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Bibliographic Details
Published in:Industrial & engineering chemistry research 2019-05, Vol.58 (18), p.7495-7510
Main Authors: Mohite, Lalaso V, Juvekar, Vinay A, Sahu, Jyoti
Format: Article
Language:English
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Summary:Isothermal titration microcalorimetry experiments are performed to measure the heat of adsorption of poly­(ethylene glycol) (PEG) on nonporous silica nanoparticles. A calorimetric technique is also developed for the determination of the adsorption isotherm for the PEG–silica system. A model based on the continuum form of the self-consistent field theory is used for estimating the polymer–surface interaction parameter, χ*, from the heat of adsorption of the polymer. The effect of temperature and molecular weight of PEG on χ* has been determined. It is shown that the adsorbed amount of PEG on silica, predicted using the estimated value of χ*, is in good agreement with the experimental data. We also find that the major contribution to the heat of adsorption arises from the bound fraction of the adsorbed polymer.
ISSN:0888-5885
1520-5045
DOI:10.1021/acs.iecr.8b04792