简介:探讨了聚(二甲基硅氧烷己二酰二胺)(PDMSA)增韧线性酚醛树脂的机械性能(弯曲强度、弯曲模量和缺口悬臂梁冲击强度),热稳定性和阻燃性能。由于PDMSA的软链段能吸收外加于脆性线性酚醛树脂网络结构的负荷,改性的线型酚醛的机械性能随PDMSA含量增加而提高。热失重分析(FGA)结果表明,其热降解温度高于400℃,失重10%的温度随PDMSA含量增加而提高,碳化率随线型酚醛树脂含量增加而增加。用扫描电子显微镜(SEM)观察了改性酚醛树脂的断裂表面的形态,其结果与其机械性能变化一致。改性线型酚醛树脂还具有优良的阻燃性(UL—94V—I级),氧指数35.0以上。
简介:Throughmeasuringthecoefficientoflinearexpansion,thestructureandpropertiesoftheLi2O-Al2O3-SiO2lowexpansionglassceramicscontainingB2O3arestudiedbyJRandXRD.ItisshoutnthattheIRmethodisefficientinthestudyoftheglass-ceramicsstructure.Thereisa"Boronabnormality"inthesystemwhichhasanimportantinfluenceonthepropertiesoftheglass-ceramics.
简介:TheelectronicstructuresofCuS2,CuSe2andCuTe2withpyritestructures,withintheframeworkthedensity-functionaltheoryhavebeeninvestigated.ThecalculatedresultsexplainedtherecentexperimentalresultswhichshowthatthereisnoclearindicationofstrongelectroncorrelationsintheelectronicpropertiesofCupyrites,duetothedominantchalcogenpcharacterratherthandcharacteristicofCuattheFermilevel.
简介:TheantibacterialeffectofcarryingsilverB2O3-SiO2-Na2Oglassmaterialwasstudiedbymeansofantibacterialring,nephelometery,MICvalue,thinfilmattachmentandmicrocalorimetry,respectively.TheexperimentalresultsoffivekindsofantibacterialtestmethodsarealmostidenticalandcanverifythatcarryingsilverB2O3-SiO2-Na2Oglassmaterialexertsanexcellentantibacterialperformance.Antibacterialringandnephelometeryaresimple,quick,buttheprecisionisrestrictive.MICvalue,thinfilmattachmentmethodandmicrocalorimetrycanquantitativelycomparetheantibacterialeffectsoftheantibacterialglassmaterial.Comparedwiththetraditionalmicrobetestmethods,themicrocalorimetrycananalyzetheinhibitingeffectofthecell'sgrowthandmetabolismontheantibacterialglassmaterialbymonitoringthethermaleffectcontinuouslyandautomatically.
简介:Newvisibletransparent,UVabsorption,andhighinfraredreflectionpropertieshavebeenrealizedbydepositingmultilayerSiO2/ZnO:Al/CeO2-TiO2/SiO2filmsontoglasssubstratesatlowtemperaturebyradiofrequencymagnetronsputtering.OptimumthicknessofSiO2,ZnO:Al(ZAO)andCeO2-TiO2(CTO)filmsweredesignedwiththeaidofthinfilmdesignsoftware.Thedegreeofantireflectioncanbecontrolledbyadjustingthethicknessandrefractiveindex.TheouterSiO2filmcandiminishtheinterferencecoloringandincreasethetransparency;theinnerSiO2filmimprovestheadhesionofthecoatingontheglasssubstrateandpreventsCa2+,Na+intheglasssubstratefromenteringtheZAOfilm.Theaveragetransmittanceinthevisiblelightrangeincreasesbynearly18%-20%,ascomparedtodoublelayerZAO/CTOfilms.Andthefilmsdisplayhighinfraredreflectionrateofabove75%inthewavelengthrangeof10-25μmandgoodUVabsorption(〉98%)properties.Thesesystemsareeasytoproduceonalargescaleatlowcostandexhibithighmechanicalandchemicaldurability.ThetriplefunctionalfilmswithhighUVabsorption,antireflectiveandhighinfraredreflectionratewilladapttoapplicationinflatpaneldisplayandarchitecturalcoatingglass,automotiveglass,withdiminishinglightpollutionaswellasdecreasingeyefatigueandincreasingcomfort.
简介:Inpursuingexcellentsupercapacitorelectrodes,wedesignedaseriesofM0S2/C0S2compositesconsistingofflower-likedMoS2andoctahedron-shapedCoS2throughafacileone-stephydrothermalmethodandinvestigatedtheelectrochemicalperformanceofthesampleswithvarioushydrothermaltime.Duetothecouplingoftwometalspeciesandabigamountofwell-developedCoS2andMoS2,theresultsindicatedthattheMoS2/CoS2compositeselectrodesexhibitedthebestelectrochemicalperfor-mancewithalargespecificcapacitanceof490F/gat2mV/sor400F/gat10A/gamongallsamplesasthehydrothermaltimereached48h(MCS48).Furthermore,theretentionofMCS48is93.1%after10000cyclesat10A/g,whichmanifeststheexcellentcyclingstability.TheoutstandingelectrochemicalperformanceofMCS48indicatesthatitcouldbeaverypromisingandnovelenergystoragematerialforsupercapacitorsinthefuture.
简介:以便得到TiB2-Al2O3的同质的混合物和协议,一个表面修正方法被用来准备nano规模的杂交Al2O3涂的TiB2粒子。PE蜡粒子是第一到由杂交,然后nano规模Al2O3粒子的TiB2粒子上涂又是涂的到由PE蜡粒子涂的TiB2的表面上。SEM,TEM和版本被用来描绘同样收到的核心/壳粒子和它的协议的微观结构。试验性的结果显示出那粒子规模TiB2和Al2O3的同质的分散能不仅在混合粉末而且在使脱蜡的协议被形成。协议当时是由煤气压的sintering(GPS)的sintered。物件顶端的装饰物产品显示出与参考样品由正常方法制作了作比较的改进技工性质。
简介:SiO2-B2O3-Al2O3-CaO在低sintering温度使契约成玻璃,高力量被讨论。FTIR和XRD分析被用来与铝的不同内容描绘基本使成玻璃的契约的结构。弯曲力量和热扩大系数也被测试。同时,在660光线衍射(XRD)的sintering温度的合成标本的微观结构,扫描电子显微镜(SEM)分析和其它工具。结果证明分别地,钾和磷的溶解率在95.64wt%lessthan的一种谷物尺寸的条件下面是70wt%和93.7wt%0.074公里,9.78gg-1硫磺的酸,0.5gg-1铵氟化物,160桴???瑳畲瑣牵獥椠?慭湩慴湩摥映吗??
简介:TiB2ceramicspowderwassynthesizedfromB2O3-TiO2-Mgsystem.TheeffectsofTiB2additionasdiluentonthecombustionsynthesisprocesswereinvestigated.TheresultsofthermodynamiccalculationandexperimentsshowthattheincreaseofTiB2contentrangingfrom0to20wt%canreducetheadiabatictemperatureTadfrom3100Kto2896KandcombustiontemperatureTcfrom2139Kto1621Krespectively.TheparticlesizeandhalfwidthoftheparticledistributionarealsoincreasedwiththeadditionofTiB2increasingfrom0to20wt%.ThecombustionproductisamixtureofTiB2,MgO,andotherintermediatephases.TheleachedproductcontainsmainlyTiB2,TiO2andTiN,anditsoxygencontentis7.77wt%.
简介:TiO_2isapromisingphotocatalyst.However,thelowphotocatalyticefficiencycallsforthemodificationofTiO_2.Metal-andnonmetal-dopingofTiO_2havebeenprovedtobeeffectivewaystoenhancephotocatalyticproperties.Thisreviewprovidesadeepinsightintotheunderstandingofthemetal-andnonmetal-dopedTiO_2photocatalysts.ThisarticlebeginswiththeintroductionofthecrystalstructuresofTiO_2andapplicationsofTiO_2materials.Wethenreviewedthedoped-TiO_2systemintwocategories:(1)metal-dopedTiO_2photocatalystssystem,and(2)nonmetal-dopedTiO_2photocatalystssystem.Bothexperimentalresultsandtheoreticalanalysesareelaboratedinthissection.Inthefollowingpart,fortheadvantagesofTiO_2thinfilmsoverparticles,variouspreparationmethodstoobtainTiO_2thinfilmsarebrieflydiscussed.Finally,thisreviewendswithaconciseconclusionandoutlookofnewtrendsinthedevelopmentofTiO_2-basedphotocatalysts.