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1、Articlepubs.acs.org/LangmuirTribochemistryandSuperlubricityInducedbyHydrogenIonsJinjinLi,ChenhuiZhang,*LiangSun,XinchunLu,andJianbinLuoStateKeyLaboratoryofTribology,TsinghuaUniversity,Beijing,100084,ChinaABSTRACT:Frictionbehaviorofaqueoussolutionatmacroscaleisqui
2、tedifferentfromthatatnanoscale.Atmacroscale,tribochemistryusuallyoccursbetweenlubricantandfrictionsurfacesintherunning-inprocessduetoahighcontactpressure,andmostsuchprocessescanleadtofrictionreduction.Inthepresentwork,wereportedthatthehydrogenionsinaqueoussolution
3、playedanimportantroleintribochemistryinrunning-inprocess(frictionreducingprocess),whichcouldresultinthefrictioncoefficientreducingfrom0.4to0.04betweenSi3N4andglasssurfacesatmacroscale.Itisfoundthattherunning-inprocessandlowfrictionstatearecloselydependentontheconce
4、ntrationofhydrogenionsinthecontactregionbetweenthetwofrictionsurfaces.Thelubricationmechanismisattributedtotribochemicalreactionoccurringbetweenhydrogenionsandsurfacesintherunning-inprocess,whichformsanelectricaldoublelayerandhydrationlayertolowerfrictionforce.Fi
5、nally,therunning-inprocessofH3PO4(pH=1.5)wasinvestigated,whichcouldrealizesuperlubricitywithanultralowfrictioncoefficientofabout0.004.14−161.INTRODUCTIONafterarunning-inperiod.ApossiblemechanismisthetribochemicalreactionofsiliconnitrideorsiliconcarbidewithInvestiga
6、tionsonthefrictionbehaviorsofanaqueoussolutionconfinedbetweentwocontactingsurfacesareveryimportanttowater,whichcannotonlyformasmoothsurfacefordevelopawater-basedlubricantthatwouldbeaneffectivewayhydrodynamiclubrication,butcanalsoproducecolloidalsilica17topartiallys
7、olveenvironmentalissues.Therefore,thefrictionforboundarylubrication.Inourpreviouswork,anultralowpropertiesofaqueoussolutionatnanoscalehavebeenfrictioncoefficient(below0.01)betweenaglassplateanda1−8extensivelystudiedbyatomicforcemicroscopy(AFM)Si3N4ballwasobtainedun
8、derthelubricationofphosphoricandsurfaceforceapparatus(SFA).9−12Forexample,Feileret18acidsolution(pH=1.5)afterarunning-inperiodof600s.al.haveinvestigatedthedepe
