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1、Articlepubs.acs.org/LangmuirExcellentLubricatingBehaviorofBraseniaschreberiMucilageJinjinLi,YuhongLiu,JianbinLuo,*PengxiaoLiu,andChenhuiZhangStateKeyLaboratoryofTribology,TsinghuaUniversity,Beijing100084,ChinaABSTRACT:Thepresentworkreportsanexcellentlubricationpropertyofanaquaticplantcalled
2、Braseniaschreberi(BS).ToinvestigatethelubricationcharacteristicsoftheBSmucilage,anovelmeasuringsystemisdesigned,andanultralowfrictioncoefficientabout0.005betweenthemucilageandglasssurfacehasbeenobtained.Itisfoundthattheultralowfrictioniscloselyrelatedtothestructureofmucilageandwatermoleculesi
3、nthemucilage.Themicro-structureanalysisindicatesthatthemucilagesurroundingBSformsakindofpolysaccharidegelwithmanynanosheets.Apossiblelubricationmechanismisproposedthattheformationofhydrationlayersamongthesepolymernanosheetswithplentyofbondedwatermoleculescausestheultralowfriction.Theexcelle
4、ntlubricationpropertyhasapotentialapplicationforreducingthefrictionbetweenaglossypillcoatedwithsuchlayerofmucilageandpeople’sthroats.1.INTRODUCTIONInnature,therearesomeeffectivelubricationsystems,which1havebecomeoneoftheforefrontsoftribology,forexample,2−8thenaturalsynovialjointlubrication,t
5、hemucousbarrier9,10lubricatedbythegastricmucin,theeyelubricatedwith11,12tears,andthemotionofwhitebloodcellsalongblood13capillaries.Themaindifferencebetweenthegenerallubricantandthebiologicallubricantisthattheformerisusuallyoil-1basedwhilethelatteriswaterbased.Duetopressurizingwater14hardlyin
6、creasingitsviscosityatall,theconventionalelastohydrodynamiclubricationtheorydoesnotadapttothesituation.Instead,someothermechanismsappeartodescribetheeffectivelubricationinnature,suchasthebrushlayer15Figure1.SchematicillustrationandforceanalysisofeatingBSandpillformedbyachargedpolymer,theelec
7、trostaticdoublelayerprovidedbyachargedsurface,16andthehydrationlayerformedwithacoatingofmucilage.(a)BSsampleinthenaturalstate.(b)byboundwatermolecules,17allleadingtoanultralowfriction.Schematicillustrationofgraftingsuchkindofmucilageontothesurfaceofapill
