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Measurements of the Effect of Angular Lattice Mismatch on the Adhesion Energy Between two Mica Surfaces in Water

Published online by Cambridge University Press:  28 February 2011

Patricia M. Mcguiggan  and
Jacob N. Israelachvili
Patricia M. Mcguiggan
Affiliation:
Department of Chemical and Nuclear Engineering, and Materials Department, University of California, Santa Barbara, CA 93106.
Jacob N. Israelachvili
Affiliation:
Department of Chemical and Nuclear Engineering, and Materials Department, University of California, Santa Barbara, CA 93106.
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Abstract

Results are presented of direct measurements of the adhesion between two molecularly smooth mica surfaces in water. The results show that the adhesion forces and surface energies strongly depend upon the angle between the two surface lattices (angle of crystallographic misorientation). Apart from a relatively angle-independent “baseline” adhesion, sharp adhesion maxima (corresponding to minimum energy “cusps”) were observed at θ = 0°, ±60°, ±120°, and 180°. These discrete angles coincide with interplanar orientations of maximum crystallographic alignment or dense CSL structure. As little as ±1° away from the energy maxima, the energy decreases by 50%. This is much more dramatic than has previously been obtained with high energy metallic solids and suggest that the peak shapes are determined by the interplay of interlayer (adhesion) forces and intralayer (lattice) forces. For the mica system, the lattice forces are much stronger than the van der Waals adhesion forces, and thus the peaks are very sharp. Adsorption of ions onto the mica surfaces decreases the adhesion as well as the whole longer-range force-law which is also angledependent but to a smaller degree as the distance between the surfaces increases beyond a few molecular layers. The consequence of these findings is that the adhesion of grain boundaries and the equilibrium thicknesses of thin interfacial films and intergranular spaces are determined not only by the properties of the surfaces and the molecular structure of the intervening film but also on the relative crystallographic orientation of the two surfaces.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 138: Symposium Q – Characterization of the Structure and Chemistry of Defects in Materials , 1988 , 349
Copyright
Copyright © Materials Research Society 1989

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