Effect of pH and hydration on the normal and lateral interaction forces between alumina surfaces

[摘要] Interaction forces between alumina surfaces were measured using an AFM-colloid probe method at different pHs. For an alpha-alumina-sapphire system at acidic pH, the force curve exhibited a well-defined repulsive barrier and an attractive minimum. At basic pH, the interactive force was repulsive at all separations with no primary minimum. Lateral force measurements under the same conditions showed that frictional forces were nearly an order of magnitude smaller at basic pH than those observed at acidic pH. This behavior was attributed to the hydration of the alumina surface. Normal and lateral force measurements with the strongly hydrated p-alumina surfaces supported these findings. (c) 2006 Elsevier Inc. All rights reserved.

[发布日期] 2006-12-15

[关键词] atomic force microscopy;colloid probe;force curve;DLVO theory