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1、Articlepubs.acs.org/LangmuirSuperlubricityAchievedwithMixturesofAcidsandGlycerolJinjinLi,ChenhuiZhang,*LiranMa,YuhongLiu,andJianbinLuoStateKeyLaboratoryofTribology,TsinghuaUniversity,Beijing,100084,ChinaABSTRACT:Inthiswork,superlubricitybetweenglassandSi3N4surfacesl
2、ubricatedbymixturesofacidsolutionsandglycerolsolutionshasbeenfoundbyusingatraditionaltribometer.Ultralowfrictioncoefficientsofbetween0.004and0.006wereobtainedafterarunning-inperiod.Relatedexperimentsindicatethatthehydrogenionsinthemixturesplayanimportantroleinachievin
3、gsuperlubricity.Moreover,theultralowfrictionisalsocloselyrelatedtothepHvalueoftheacidandtheconcentrationofglycerol.Accordingtotheseresults,thepossiblesuperlubricitymechanismhasbeenrevealed,whichisattributedtoafluid-hydratedwaterlayerbetweenthehydrogen-bondednetworkso
4、fglycerolandwatermoleculesonthepositivelychargedsurfaces.■INTRODUCTIONhydrogenbondeffect,buttherearenohydrogenionsinthe1polyhydroxyaqueoussolutions.Therefore,weproposeanovelSincetheappearanceoftheconceptofsuperlubricity,ithasmethodtoachievesuperlubricitybymixingtheac
5、idsolutionattractedagreatamountofattentionamongresearchersinandpolyhydroxyaqueoussolutiontomeetthetwoconditionsmanyfieldsintheirsearchforlubricantswithsuperlubricity2simultaneously.properties(μ<0.01),whichwouldbeaveryeffectivewaytoToconfirmwhethersuperlubricitycanbeobt
6、ainedbyusingpartiallysolveenergyissues.Someself-lubricatingsolidthismethod,sixkindsofacidsolutionsweremixedwiththelubricantswerefirstfoundtohaveultralowfrictionproperties,3,45,6glycerolsolution,andthefrictionalbehaviorlubricatedbythesesuchasdiamondlikecarbonfilms,moly
7、bdenumdisulfide,7mixtureswasinvestigatedwithatraditionaltribometer.Withandhighlyorientedpyrolyticgraphite.Thiskindofsuper-thelubricationofthesemixtures,thesuperlubricitywaslubricitygenerallyoriginatesfromincommensuratesurfaceobtainedafterarunning-inperiod.Inthepresen
8、twork,thelatticestructures,weakdispersiveinterlayerinteractions,or8−10effectoftheconcentrationofacidsolutionandglycerolsolutioncoulombrepul
