Dependencyofattractiveforceoninteractiondistancebetweentipapexandsolidsurfacecanbemeasureddirectlybyusingatomicforcemicroscope(AFM).Bytreatingthetipapexwithbydrophobicagent(hexamethyldisilazane,HMDS),themaximumfoi℃eanditsinteractionlengthbecomelowandshort,whichareduetovanderWaals(vdW)andhydrogenbondinteractions.Theresulthasacorrelationtotheanalysisdataofsurfaceenergy・Itseemsi､easonabletosupposethattheadhesionanddispersionpropertiesofmicrocondensedmatterscanbeanalyzedbyusingAFM.

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Thesurfacemodificationbehaviorandthedegreeofmodificationofinorganicoxidepowdersbymonobutylphosphoricesterwereexaminedbyusingpotentiometrictitrationmethodlogy.Siliconoxide,titaniumoxide,andaluminumoxidewithdifferentequi-acid-basepointsweremodifiedbyusingmonobutylphosphoricesterinaqueoussolutions.Asaresult,itbecameclearthatsurfacemodificationreactionofthreekindsofinorganicpowderstookplacebytheadsorplionofmonobutylphosphoricesteraniononOH,"sitesonthen･oxidesthroughionicbonding.Inaddition,titrationdatashowedthattheamountsofSiO2,TiO,.AlAsurfacesbythemonobutylphosphoricesterweretobe0．00mg．m-2.0.09mg．m-2,0.24mg・m-2，whichwereingoodagreementwiththeamountsdeterminedbycarbonanalyzer.Therefore,itwassuggestedthatpotentiometrictitrationisoneofusefultechniquestomeasuretheamountsofsurfacemodificationofinorganicoxidepowder

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