Particular attention is given to elucidating the interaction of both DLVO forces and non-DLVO forces present in colloidal systems due to its significance on emulsion stability. In this work, an experimental study was conducted to explore the forces effective between asymmetric hydrophobic bodies (particles, bubbles, oil droplets, solid surfaces) in aqueous solution with the application of Atomic Force Microscopy (AFM). Subsequently, analysis of the acquired force data was carried out based on Stokes−Reynolds−Young−Laplace theoretical model to provide an explicit understanding of the physical principles of forces related to such systems. The results show that van der Waals and electrical double-layer forces, in combination with hydrophobic force and other structure forces including steric hindrance stem from long-chain macromolecules, play a vital role in determining the state of the intervening liquid film. It turns out that the hydrophobic force between two hydrophobic bodies could be altered by changing the content of ethanol or glycerol in aqueous solution. We demonstrate that, with a subtle control of the continuous phase condition, the colloidal forces between dispersed bodies, and hence the stability of the colloidal system, could be suitably manipulated.

AFM study of colloidal forces between asymmetric hydrophobic bodies in aqueous solution

Macromolecular Chemistry: The Second Century

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ACS Spring 2020 National Meeting & Expo

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.