简介:Aporosity-freeandcontamination-freesurfacelayerwithgrainsizesrangingfromnanometertomicrometerinFesampleswasobtainedbysurfacemechanicalattritiontreatment(SMAT)technique.MechanicalandwearpropertiesofthesurfacelayerintheSMATedandannealedFesamplesweremeasuredbymeansofnanoindentationandnanoscratchtests,respectively.ExperimentalresultsshowedthatthehardnessofthesurfacelayerintheSMATedFesampleincreasedevidentlyduetothegrainrefinement.TheelasticnoduliofthesurfacelayersintheSMATedandannealedFesampleswereunchanged,independentofgrainsizeinthepresentgrainsizeregime.ComparedwiththeoriginalFesample,thewearresistanceenhancedandthecoefficientoffrictiondecreasedinthesurfacelayeroftheSMATedFesample.
简介:1.ObjectivesLaboratoryforSurfacePhysicsofAcademiaSinica(LSPAS)wasestablishedin1987forenhancingtheresearchactivityinsurfacesciences,accordingtotheNationalLaboratoryProjectoftheStatePlanningCommittee.Duringthelast30years,wehavewit-nessedatremendousdevelopmentinsurfacephysics.Photoemissionspectroscopy(1981NobelprizetoSiegbahnforESCA)offers
简介:合金690TT样品任何一个的氧化手工地磨擦了到400和1500砂砾,机械地擦亮,或electropolished与2.5×10−6在1500×10−6B和2.3×10−6李的一个答案被执行在为60天的325°C和15.6MPa的溶解H2,。与不同表面状态在样品上种的氧化物电影用各种各样的技术被分析。结果证明三元组分层的结构在沉浸以后被形成:与在Fe和Ni的大散布氧化物粒子富人一起的最外面的层,与在为地面的Cr和Fe的小紧缩的氧化物粒子富人一起的中间的层出现并且在为擦亮的表面的Ni的松开的像针的氧化物富人,和有连续Cr富有的氧化物的内部层。表面状态被发现影响不仅表面形态学,而且腐蚀率。磨擦加速了保护的氧化物电影的生长以便扎根的样品比擦亮的显示出更低的氧化率。地面合金690TT的样品显示出优异抵抗到intergranular攻击(IGA)。
简介:Surface-graftedpoly(ethyleneglycol)(PEG)moleculesareknowntopreventproteinadsorptiontothesurface.NitinolsampleswerecoatedundertetraglymeECRcoldplasmaconditionstoenhanceitsbiocompatibility.ThemodifiedNitinolsurfaceswerecharacterizedbyhighresolutionESCAandcontactangle,itwasdemonstratedthatthedepositedPEG-likecoatingswerebuiltupmainlyof-CH2-CH2-O-linkagesinsurfaces.ThesurfacewettabilityofthemodifiedNitinolwasincreasedcomparedwiththecontrolsurface.HumanplasmaproteinwasadsorbedonNitinolevaluatedbySEM,theproteinadsorptiononmodifiedsurfacesdecreasedrapidly.Thus,thepotentialbenefitsofcoldplasmatechniquewillbeofusetothebiomedicalindustriesimprovingthebiocompatibilityofmetals.
简介:TheheterogeneousnucleationbehaviorsofNH4ClcrystalonroughaluminumsubstratesurfaceimmergedinNH4Cl-H2Osolutionwereexperimentallyanalyzed,andtheinfluencemechanismofthemicro/nano-scalesurfacestructuresonheterogeneousnucleationwasinvestigated.Ithasbeenshownthatwettabilityandnucleationareaffectedbysubstratesurfacecondition.Theintrinsicwettingpropertiesbetweennucleusandsubstratesurface,andthesurfacestructureofcertaingeometricalscales,bothimposeeffectsontheheterogeneousnucleationproperties.Foranucleus-wettingsubstratesurface,heterogeneousnucleationispromotedbyahighercomplexityofthesurfacemorphology;butforanucleus-nonwettingsubstratesurface,heterogeneousnucleationisinhibitedbyahighercomplexityofthesurfacemorphology.
简介:TheheterogeneousnucleationbehaviorsofNH4ClcrystalonaroughchillingsurfaceofaluminumimmergedinNH4Cl-H2Osolutionwereexperimentallyanalyzedandtherelationshipbetweenthesurfaceroughnessandthenucleationsiteselectionbehaviorsonpolishedaluminumsubstratewasinvestigated,anditwasdiscoveredthatthenumberofnucleationsitesdecreasessignificantlywithdecreasingtheroughnessofthepolishedsubstrate.Furthernucleationexperimentswerecarriedoutonchemicallyetchedaluminumsubstratewithregularmicro-morphologyonitssurface.Ithasbeenshownthatboththemicro-morphologyandthewettabilityvarywiththesubstratesurfacepreparedbydifferentetchingprocess.Thepreparedsurfacewithstep-likestructureshasastrongwettabilitywithNH4Cl-70wt%H2OsolutionandthenucleationdensityofNH4Clontheitssurfacesissignificantlyhigherthanthatofthereferencesurfaces,whichshowsthatthegeometricalmorphologyfeatureshaveimportanteffectsonboththewettabilityandthenucleationbehaviors.
简介:Inthepresentstudy,aseriesofregenerationconditionsandtheregenerationmechanismofmodifiedlakesedimentbiochar(Fe-KOH/LSB)catalystsforlow-temperaturecatalytichydrolysisofcarbondisulfide(CS2)wereinvestigated.TheresultsshowedthatRm-WNAmethodhadthebestregenerationeffect.Underoptimalregenerationconditions,thesulfurcapacity(13.86mg[s]/g[catalyst])ofregeneratedFe-KOH/LSBwasclosetothatoffreshFe-KOH/LSB(14.88mg[s]/g[cataiyst]).Thewaterwashingprocesscouldwashawayasmallnumberofsulfatesandalargenumberofalkalinegroups.TG-DTAandDRTFIRresultsindicatedthatthenitrogensweepingprocesscoulddecomposeFe2(SO4)3intoFe2O3,whichpartiallyrecoveredthecatalyticandtheadsorptiveabilities.CO2-TPDresultsindicatedthatthealkalisteepingprocessoffer-OHgroups,furtherimprovingthecatalyticandtheadsorptiveabilities.After3times-regeneration,thesulfurcapacityofFe-KOH/LSBreached13.31mg[s]/g[cataiyst],indicatingthattheRm-WNAmethodhadgoodstabilityfortherecoveryofthecatalyticactivity.BET,XPSandXRDresultsrevealedthatthedecreaseofthesulfurcapacityforregenerationwasattributedtothedecreaseoftheadsorptiveabilitiesofCandSiO2.
简介:在在黄金和kaolinite表面之间的kaolinite和相互作用的金胶体的分发被传播电子显微镜学(TEM)和X-raypliotoelectron光谱学(XPS)调查。在金粒子和kaolinite的边表面之间有强壮的相互作用,在低酸碱值答案,kaolinite的边表面断然被控告,在colloide金牌粒子之间的静电的吸引力和积极的边表面ofkaolinite将便于胶态金粒子的吸附到suface上。TEMobservation证明金粒子的总数形态学被particle-particleinteraction统治,金粒子在kaolinite晶体的边表面上被吸附,源于在胶态金粒子和kaolinite的积极表面之间的静电的吸引力。在Au4f电子系列,有四座精力山峰的XPS数据表演联系了衣服旧,83.8eV,85.7eV,87.5eV,和89.4eV,分别地它建议处于化学状态,有金属性的黄金,Au结合到O,类似于Au_2O_3的形式,并且合成Au_2O_3在kaolinite的边表面和胶态金表面之间被形成。
简介:在过去的十年,nanopores为各种各样的潜在的应用程序广泛地被开发了,并且他们的性能极大地取决于nanopores的表面性质。原子层免职(ALD)是为扔薄电影的一种新技术,它很快从一种壁龛技术被开发了到一个确定的方法。ALD电影能保角地甚至在nanoscale在限制区域盖住表面,因此,是一个强大的工具修改合成nanopores并且也的表面制作复杂nanopores被证明。这评论在nanopore合成和ALD基本知识上给简短介绍,然后集中于由ALD和他们的应用程序处理的合成nanopores的各种各样的方面,包括单个分子的察觉到,nanofluidic设备,nanostructure制造和另外的应用程序。
简介:Aseriesofsolarradiationtestsforthepolytetrafluoroethylene(PTFE)bulkandfilmsampleswerecarriedoutusingQ-SUNXE-3-HSCtypeSolarRadiationSimulator,withthetestparametersasfollows:radiationintensityis1120W/m~2,temperatureis55℃andhumidityis70%RH.Surfacemorphology,compositionandmicrostructureofthePTFEsamplesbeforeandafterradiationtestswerecharacterizedcontrastively.EffectofsolarradiationonthetribologyandwettingpropertiesofPTFEwerealsostudiedbytribometerandcontactangletester,respectively.Theresultsshowthat,forradiatedPTFE,surfaceroughness,therelativecontentofCelement,thefrictioncoefficientsandthecontactanglewithwaterincreasedinvaryingdegrees.Inconclusion,theobviouschangeinPTFEsamplescanbemainlyattributedtobreakof(CFx)-CbondsafterbombardmentofhighenergyUVphotons,whichcausesthelossofF-richgroups,oxidation,crosslinkingandrestructuringofactiveunsaturatedgroups.
简介:碳nanofibers(CNF)的表面functionalization被执行,ie,CNF第一被氧化然后表面经由一个集会方法是由3-Aminopropyltriethoxysilane(APTES)的silanized。一种新类型高穿抵抗s-CNFs/epoxy合成被制作由在原处反应。FTIR光谱学被用来检测silane在CNF的表面上生产的功能的组的变化。tribological性质和微观结构修改,未修改的CNFs/epoxycomposites分别地被学习。expremental结果显示APTEScovalently成功地被连接到CNF的表面并且在环氧基树脂矩阵改进CNF的分散。磨擦系数和s-CNFs/epoxycomposites的wear率是比在一样的负担下面的u-CNFs/epoxycomposites的那些显然低的。调查也显示磨料穿主要为u-CNFs/epoxy穿机制合成,为在一样的滑动下面合成的s-CNFs/epoxy与细微粘合剂穿穿状况。
简介:水泥臼的区域在早舞台在硫酸盐答案沉浸的在表面的42-集中分布被与化学分析相结合的分层的采样方法因此测量,并且散开系数在进内部区域的臼的表面区域的42-阴离子因此借助于即时飞机是计算的散开理论。当散开深度在臼的表面区域增加了时,试验性的结果证明SO42-集中逐渐地减少了。散开系数(D)与集中和有点环境的硫酸盐答案是相关的,它在开始与沉浸时间减少了,然后在时间的一个时期以后慢慢地升起了。起始的散开系数的计算(D0)和恶化的开始的时间(t)由硫酸盐引起了攻击进一步基于散开系数的数据被尝试,并且D0和t都也与硫酸盐和硫酸盐的不同类型的集中是相关的,这被发现。
简介:在这研究,离氨酸被介绍进apatitewollastonite玻璃的表面陶器(AW-GC)走反应在二改进它的cytocompatibility过程。第一,离氨酸与N连接了--(aminoethyl)--由酰胺组有约束力的共有原子价的aminopropyltrimethoxysilane(A-1120)。第二,lysine-functionalizedA-1120通过包含一个共有原子价附件的silanization反应在AW-GC的表面上被扔。FTIR系列显示离氨酸成功地被使不能调动到AW-GC的表面上。表面的Bioactivity修改了AW-GC被模仿的身体液体(SBF)调查,并且在里面vitrocytocompatibility被coculturing与人的osteosarcoma房间MG63评估。当hydroxyapatite免职的模式被改变时,结果证明在修改材料上形成的hydroxyapatite层的过程类似于AW-GC。MG63细胞的生长证明与离氨酸修改AW-GC表面提高细胞粘附和增长。