简介:以两种Al2O3-Al2TiO5复合粉体为原料经SPS烧结制备出Al2O3-Al2TiO5复相陶瓷。采用纳米结构复合粉体烧结而成的复相陶瓷有着较优的力学性能,特别是具有较高的断裂韧性和硬度,与其较小的晶粒尺寸相对应。干滑动摩擦磨损试验在4N和6N法向载荷下进行,结果表明,采用微米结构复合粉体烧结而成的复相陶瓷磨损表面较光滑,体积磨损量较小。在磨损试验中,纳米结构复合粉体烧结而成的复相陶瓷的破坏方式为沿晶断裂,有明显的晶粒拔出现象;微米结构复合粉体烧结而成的复相陶瓷呈不连续的微观断裂并产生塑性变形;同时,两种材料在摩擦磨损过程中都发生接触面的氧化和物质转移。
简介:hydroxyapatite(哈)涂层在对待H2O2的碳/碳(C/C)上被完成通过热水地对待和在超声的水下面在一个氨答案加热扔的CaHPO4涂层的正式就职合成洗澡。然后,这哈涂层被放在一个NH4F答案并且热水地再对待制作氟化的hydroxyapatite(联邦住房管理局)为在353,373,393和413K的24h的涂层分别地。结构,形态学和HA和联邦住房管理局涂层的化学作文被SEM,XRD,版本和FTIR描绘,并且粘着性和这些联邦住房管理局涂层的化学稳定性被擦伤测试和沉浸测试分别地检验。结果证明同样准备的联邦住房管理局涂层包含了像针或像条纹的晶体,与那些不同HA涂层。作为加氟作用温度玫瑰,FHA涂层的粘着性首先在在353和393K之间的温度从34.8~40.9N增加了,然后在413K减少了到24.2N,当FHA涂层的溶解率稳定地减少了时。为FHA涂层的性质变化的原因被分析涂层的形态学,作文和结构建议。
简介:Anovelfluorescentprobe9-(4-(1,2-diamine)benzene-N1-phenyl)acridine(DABPA)wassynthesizedforthedetectionofnitricoxide(NO)andcharacterizedbyIR,1H-NMRandEI-MSspectroscopy.Basedonaphotoelectrontransfermechanism,thefluorescenceintensitiesofDABPAwereinvestigatedwiththedifferentconcentrationsofNO.Undertheoptimalexperimentalconditions,thefluorescenceintensityofDABPAhadagoodlinearrelationship(R2=0.9977)withNOconcentrationintherangefrom1×10-7to1.5×10-6mol/Lwithadetectionlimitof1×10-8mol/L.ThecytotoxicityinducedbyDABPAwasevaluatedbytheMTT(3-(4,5-dimethylthiazol-2-yl)-2,5diphenyltetrazoliumbromide)assayforbiologicalapplication.Furthermore,theprobeDABPAhadalsobeensuccessfullyappliedtoreal-timeimageNOproducedinPC12cellsinthepresenceofL-arginine.
简介:TiO2nanometerthinfilmswithphotocatalyticantibacterialactivitywerepreparedbythesol-gelmethodonfusedquartzandsodalimeglassprecoatedwithaSiO2layer.ThethinfilmswerecharacterizedbyX-rayphotoelectronspectroscopy(XPS),scanningelectronmicroscopy(SEM),andX-raydiffraction(XRD).TheresultsshowthatsodiumandcalciumdiffusionintonascentTiO2filmiseffectivelyretardedbytheSiO2layerpre-coatedonthesodalimeglass.Theantibacterialactivityofthefilmswasdetermined.ThecrystallineofTiO2nano-meterthinfilmhasimportanteffectsontheantibacterialactivityofthefilm.
简介:Thesynthesisofultrafineceriumdioxideprecursorviahomogeneousprecipitationwasstudied.Mixedaqueoussolutionofanhydrousceriumnitrateandureawasfirstheatedto85℃for2h,andthepreparedsuspensionwasthenagedatroomtemperatureforvariousperiodsoftime.Whiteprecipitatewasfinallycollectedbycentrifugingandwashedwithdistilledwaterandanhydrousethanol.Theobtainedceriumdioxide(CeO2)precursorwasobservedwithSEM.Itwasfoundthatthemorphologyandsizeoftheprecursorwerestronglyaffectedbyagingtimeandstirringconditions(withorwithoutstirring).Theprecipitatedfinesphericalparticlesoftheprecursorchangedtheirshapefromellipsetosliceordirectlytoslice.Finesphericalmonodispersed(300nm)precursorpowderscouldbeobtainedbycontrollingtheagingtime.Stirringthesolutionalsocouldchangethereactionprocessandthusthemorphologyandsizeoftheprecursorwerechanged.