Origins of the Non-DLVO Force between Glass Surfaces in Aqueous Solution

• Published in: Journal of colloid and interface science Vol. 237; no. 2; pp. 249 - 258
• Main Authors: Adler, Joshua J., Rabinovich, Yakov I., Moudgil, Brij M.
• Format: Journal Article
• Language: English
• Published: San Diego, CA Elsevier Inc 15.05.2001; Elsevier
• Subjects: atomic force microscope; Chemistry; Exact sciences and technology; gel; General and physical chemistry; glass; hydration force; non-DLVO; silica; silicic acid; Solid-liquid interface; structural force; Surface physical chemistry; transition layer; van der Waals; van der Waals; glass; transition layer; non-DLVO; silica; atomic force microscope; silicic acid; structural force; hydration force; gel; Transition layer; Liquid solid interface; Glass; Surface properties; Van der Waals interaction; Silicon Oxides; Aqueous solution; Experimental study; DLVO theory; Interaction energy; Surface treatment
• ISSN: 0021-9797; 1095-7103
• DOI: 10.1006/jcis.2001.7466

Direct measurement of surface forces has revealed that silica surfaces seem to have a short-range repulsion that is not accounted for in classical DLVO theory. The two leading hypotheses for the origin of the non-DLVO force are (i) structuring of water at the silica interface or (ii) water penetration into the surface resulting in a gel layer. In this article, the interaction of silica surfaces will be reviewed from the perspective of the non-DLVO force origin. In an attempt to more accurately describe the behavior of silica and glass surfaces, alternative models of how surfaces with gel layers should interact are proposed. It is suggested that a lessened van der Waals attraction originating from a thin gel layer may explain both the additional stability and the coagulation behavior of silica. It is important to understand the mechanisms underlying the existence of the non-DLVO force which is likely to have a major influence on the adsorption of polymers and surfactants used to modify the silica surface for practical applications in the ceramic, mineral, and microelectronic industries.