Application of Bionic Superhydrophobic Surface in Jaw End Face of Microgripper br
Chinese Journal of Lasers（2022）
摘要
Objective A microgripper is an essential part of the micromanipulationsystemAstheendeffectorofthemicrooperatingsystemthejawendfaceofthemicrogripperispronetowearadsorptionofimpuritiesiceorfrostduringoperationMosttraditionalmicrogrippersareintegrallymachinedandtheoverallreplacementwillresultinwastedresourcesThisstudyreportsadetachablemicrogripperwithsuperhydrophobicpropertiesFirstaroughmicrostructurewasmachinedontheendfaceofthejawswheretheoperationisperformedusingananosecondlaserwithacentralwavelengthof1064nmThentheyaremodifiedbyimmersingtheminanontoxicstearicacidsolutionThusabionicsuperhydrophobicsurfaceisobtainedThissurfacehasexcellentcorrosionresistanceself-cleaningantiicingandantibacterialpropertiesX-rayphotoelectronspectroscopyXPStechniqueisemployedtoanalyzethechemicalcompositionofthepristinealuminumAl-IandsuperhydrophobicaluminumAl-IIsurfacesthecorrosionresistanceofbothsurfacesinacidsaltandalkalienvironmentsistestedusingelectrochemicalexperimentsFurthertheantifoulingantifreezingandantibacterialpropertiesofbothsurfacesaretestedusingself-cleaningantiicingandantibacterialexperimentsWeexpectthatourbasicstrategiesandfindingswillenhancetheperformanceandextendtheservicelifeofthemicrogrippersMethodsBecausethemicrogripperismadeof7075spacealuminumusedtofacilitatelaterobservationtestingandanalysisa7075aluminumsamplewithsizeandthicknessof10mmx10mmand1mmrespectivelyisusedforthetestinsteadoftheendfaceofthejawsFirstananosecondlaserisusedtoetchagrid-likemicrostructureonthesurfaceofthesampleandthenitisimmersedinanontoxicstearicacidsolutionwithaconcentrationof005molLfor30mintoreducethesurfacefreeenergyFurtheritisremovedandplacedinadryingovenat60 degrees Cfor1hThesamplesurfacewillacquiretheexpectedsuperhydrophobicpropertiesusingthisprocedureAccordingtothefunctionalrequirementsofthemicrogripperthepreparedsuperhydrophobicsamplesurfacesareanalyzedforsurfacecompositionandtestedforcorrosionresistanceself-cleaningantiicingandantibacterialpropertiesThechemicalcompositionofAl-IandAl-IIsurfacesisdetectedusingtheXPStechniqueFurtherthemorphologyofthesamplesurfacesbeforeandaftercorrosionbyacidsaltandalkaliischaracterizedusingscanningelectronmicroscopyTheantiicingandself-cleaningperformanceofthesamplesurfacesareevaluatedusinganenvironmentaltestchamberandself-designedself-cleaningexperimentsThebacterialdistributionandsurvivalstatusofthesamplesurfacesarecharacterizedusinglaserconfocalmicroscopyandtheantibacterialperformanceischaracterizedusingplatecoatingexperimentstocalculatethebacterialinhibitionrateResultsandDiscussionsThelattice-likemicrostructuresobtainedfromthesamplesurfacepreparationhavehighsuperhydrophobicitywithaveragecontactandrollinganglesof1567 degrees and1088 degrees respectivelyTheXPStestresultsshowthatthesurfaceofbothsamplesmainlycontainsCOandAlelementsAfterlaserirradiationthegeneratedAl2O3onthesurfacecausedtheOatomicnumberfractiontoincreaseby2451%TheC1shigh-resolutionspectraofthesuperhydrophobicsamplesexhibitasignificantincreaseinCatomicnumberfractionfollowingthestearicacidmodificationtreatmentindicatingthatstearicacidreactedwiththesurfaceAltoformlowsurfaceenergyaluminumstearateduringthechemicalmodificationprocessTheC-CHcontentisashighas8281%occupyingthestrongestpeakwhichindicatesthatthelong-chainmoleculesofstearicacidhavesuccessfullyadheredtothesurfaceoftheAl-IIsampleintheformofaluminumstearateFig5ElectrochemicalexperimentsandSEMresultsshowthatthecorrosionresistanceofthesuperhydrophobicsurfaceinasaltsolutionisbetterthanitsresistancetoacidsandbasesthetotalimpedancemodulusofsuperhydrophobicAl-IIsampleisbetterthanthatofpristineAl-IsampleThisimpliesthatthesuperhydrophobicsurfacewitharoughmicrostructurecansignifican tlyenhancethecorrosion inhibitionofaluminummaterialsFigs6--8Table1Theself-cleaningtestresultsshowthatthedropletscaneffectivelyremovetheimpuritiesfromthesurfaceoftheAl-IIsampleindicatingthatthesuperhydrophobicsurfacehasagoodself-cleaningabilityFig10Theresultsofthetwenty-minuteantiicingexperimentsshowthattheAl-IIsamplehasexcellentsuperhydrophobicitywithlowadhesionabilityandnosignificanticingoccurredduringthetestwhereastheadheringicelayeronthesurfaceoftheAl-Isamplehasamassof1283gandshowspoorantiicingperformanceinthecryogenicenvironmentFig11TheresultsoflaserconfocalmicroscopecharacterizationintheantibacterialexperimentshowthatthenumberofstrainsadheringtothesurfaceoftheAl-IIsampleissignificantlylowerthanthatoftheAl-IsampleindicatingthatthepreparedsuperhydrophobicsamplehasastrongresistancetobacterialadhesionFig12Furthertheresultsoftheplate-coatingexperimentshowthattheantibacterialrateoftheAl-IIsampleis38timeshigherthanthatoftheoriginalAl-Isamplewhichprovesthatthealuminum-basedsuperhydrophobicsurfacewithlattice-likemicrostructurehascertainbactericidalpropertiesTable2ConclusionsInthisstudywedesignandconstructadetachablemicrogripperwithabionicsuperhydrophobicstructureinthejawendofthegripperbodywhichaddressesseveralproblemsofthetraditionalmicrogripperThemainresearchcontentsandinnovationsareasfollows1themicrogripper????sbasebodyandtheleftandrightclampingbodiesaredesignedseparatelyandconnectedbyboltsThisdesignincreasestheflexibilityofthemicrogripperwhichcanreplacethecorrespondingbodybasedondifferentclampingobjectsandworkingconditionsWhenthejawendfaceisdamagedbyrepeateduseitisunnecessarytoreplacethewholemicrogripperhoweveronlythebodypartcanbereplaced2Thelaser-texturedjawendfacesaresoakedinalowsurfaceenergystearicacidsolutiontoobtainsuperhydrophobicpropertiesThesurfaceobtainedthroughthismethodhasaroughmicrostructureandlowsurfaceenergythusforminganairlayerbetweenthematerialandtheliquiditeffectivelypreventsthecontactofthematerialsurfacewithcorrosivesolutionscommonwaterdropletsandbacterialsolutionsinhibitingtheadhesionofdropletsThisenablesthejawendfacestoacquireself-cleaninganticorrosionantiicingandantifrostpropertiesthus effectivelyenhancing the clamping performance of the microgripper
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关键词
laser technique, surface processing, bionic superhydrophobic surface, microgripper, corrosion resistance, self-cleaning, antiicing, antibacterial
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