Experimental Investigation of the Velocity Effect on Adhesion Forces with an Atomic Force Microscope

(整期优先)网络出版时间:2004-04-14
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Capillaryforcesaresignificantlydominantinadhesiveforcesmeasuredwithanatomicforcemicroscope(AFM)inambientair,whicharealwaysthoughttobedependentonwaterfilmthickness,relativehumidity,andthefreeenergyofwaterfilm.Westudythenatureofthepull-offforceonavarietyofsurfacesasafunctionoftipvelocity.Itisfoundthatthecapillaryforcesareofrelativelystrongdependenceontipvelocity.ThepresentexperimentisexpectedtoprovideabetterunderstandingoftheworkmechanismofAFMinambientair.