Related Experiment Video
Updated: Jul 5, 2026

Surface Functionalization of Metal-Organic Frameworks for Improved Moisture Resistance
Published on: September 5, 2018
Adsorption of modified dextrins on talc: effect of surface coverage and hydration water on hydrophobicity reduction
Agnieszka Mierczynska-Vasilev1, John Ralston, David A Beattie
1Ian Wark Research Institute, ARC Special Research Centre for Particle and Material Interfaces, University of South Australia, Mawson Lakes SA 5095, Australia.
Abstract:
The adsorption of three modified dextrins on the basal plane of talc has been studied using in situ tapping mode atomic force microscopy (TMAFM). The images have been used to determine the layer thickness and coverage of the adsorbed polymers. Adsorption isotherms of the polymers on talc particles were also determined using the depletion technique. Values of the adsorbed amount at equilibrium were compared with the volume of adsorbed material as determined using in situ TMAFM, revealing the presence of significant amounts of hydration water in the adsorbed layer structure. This deduction was confirmed by comparing in and ex situ TMAFM images of the adsorbed dextrins. The effect of layer thickness, coverage, and hydration water content on the contact angle of talc particles treated with polymer was investigated using the Washburn method and the equilibrium capillary pressure (ECP) method. Distinct correlations were observed between adsorbed layer properties and the measured contact angles, with the ECP measurements especially highlighting the effect of the adsorbed polymer layer hydration water. The implications for the performance of the modified dextrins in flotation are discussed.
Related Concept Videos
Factors Affecting Dissolution: Particle Size and Effective Surface Area
Bioavailability Enhancement: Drug Solubility Enhancement
Hydration of Cement
Factors Influencing Drug Absorption: Pharmaceutical Parameters
Surface Active Agents

