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Surface Properties of Synthesized Nanoporous Carbon and Silica Matrices

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Published on: March 27, 2019

Correlation between Electrostatic and Hydration Forces on Silica and Gibbsite Surfaces: An Atomic Force Microscopy

Aram Klaassen¹, Fei Liu¹, Frieder Mugele¹

¹Physics of Complex Fluids Group and MESA+ Institute, Faculty of Science and Technology, University of Twente, PO Box 217, 7500 AE Enschede, The Netherlands.

Langmuir : the ACS Journal of Surfaces and Colloids

|January 13, 2022

Summary

Hydration forces and Derjaguin-Landau-Verwey-Overbeek (DLVO) forces at interfaces are largely independent. Atomic force microscopy revealed hydration forces are independent of pH and salt concentration, unlike DLVO forces.

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Area of Science:

Surface science
Colloid and interface science
Physical chemistry

Background:

The interplay between hydration forces and Derjaguin-Landau-Verwey-Overbeek (DLVO) forces governs critical interfacial phenomena.
Understanding the molecular origins of hydration forces and their relationship to surface charge density is crucial but poorly understood.

Purpose of the Study:

To investigate the independence of molecular-scale hydration forces from continuum-scale electrostatic forces (DLVO).
To elucidate the relationship between hydration forces, surface charge density, pH, and salt concentration at solid-liquid interfaces.

Main Methods:

Atomic force microscopy (AFM) with intermediate-sized tips was employed.
Simultaneous detection of DLVO and oscillatory hydration forces at composite gibbsite:silica-aqueous electrolyte interfaces.
DLVO theory with charge regulation boundary conditions used to extract surface charge densities.

Main Results:

Both DLVO and oscillatory hydration forces were simultaneously observed at the gibbsite:silica interface across various conditions.
Oscillatory hydration forces exhibited significant independence from pH and salt concentration.
Surface charge density, derived from DLVO forces, varied with pH as expected.

Conclusions:

Hydration forces and DLVO forces originate from distinct mechanisms and are largely independent.
The pronounced hydration forces on gibbsite compared to silica are attributed to differences in hydroxyl group distribution and hydrogen bonding potential.