Lateral Force Microscopy Study of the Friction between Silica Surfaces

• Published in: Journal of colloid and interface science Vol. 232; no. 1; pp. 133 - 140
• Main Authors: Biggs, Simon, Cain, Robert, Page, Neil W.
• Format: Journal Article
• Language: English
• Published: San Diego, CA Elsevier Inc 01.12.2000; Elsevier
• Subjects: Chemistry; Colloidal state and disperse state; Exact sciences and technology; friction; General and physical chemistry; lateral force microscope; Physical and chemical studies. Granulometry. Electrokinetic phenomena; silica; silica; lateral force microscope; friction; Lateral friction; Wettability; Glass; Surface properties; Spherical particle; Experimental study; Silica; Smooth surface; Contact surface; Flat plate; Tribology
• ISSN: 0021-9797; 1095-7103
• DOI: 10.1006/jcis.2000.7196

The friction between a single silica glass sphere and a flat silica glass surface has been investigated using lateral force microscopy. Two types of silica surface were investigated, one fully hydroxylated and the other partially dehydroxlated. These samples have markedly different wetting properties and are known as hydrophilic and hydrophobic silica, respectively. The lateral friction force as a function of applied normal load has been collected for five different-sized spheres for both surface types. Analysis of the friction versus load data indicates that the hydrophilic surfaces have a molecularly smooth contact. For the hydrophobic surfaces, it is not clear whether the friction-load response is caused by a smooth or an asperity-dominated contact zone.