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时间:2020-03-26
《应用于热控的壳厚可控核壳结构SiO2@TiO2颗粒制备.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、第28卷第1期无机化学学报Vo1.28No.12012年1月CHINESEJ0URNALOFINORGANICCHEMISTRY171.175应用于热控的壳厚可控核壳结构SiO2@TiC2颗粒制备王广海张跃(北京航空航天大学材料科学与工程学院,北京100191)摘要:利用Stsber方法合成了平均粒径在800nm,球形度、单分散性良好的SiC微球,再将其作为制备核壳结构SiCk@TiC颗粒的内核。利用钛酸四丁酯水解反应,在SiC2内核上包覆制备了壳厚在30~100nm的TiO:壳层,TiC壳层厚度可根据水解反应中钛酸四丁酯的量调控。将制得
2、的SiC:@TiC。核壳结构颗粒在550煅烧1h,氧化钛壳层的晶型转变为锐钛矿相,晶型转变为锐钛矿相的TiO:更适合作为填料应用于近红外反射涂层。本文合成厚度可控SiC@TiC微球的方法是一种改进的溶胶凝胶方法,即在溶胶凝胶方法的基础上增加水热合成工艺。另外,本合成方法工艺简单,无表面活性剂或者耦合剂的引入。关键词:水热合成;核壳粒子;溶胶一凝胶中图分类号:0648文献标识码:A文章编号:1001—4861(2012)01.0171—05SynthesisofSiO2@TiC2Core·ShellParticleswithControll
3、edShellThicknessforThermalManagementApplicationsWANGGuang—HaiZHANGYue(SchoolofMaterialsScienceandEngineerin~BeihangUniversity,Bering100191,China)Abstract:Titaniacoatingonsilicacoreparticleswasperformedfrommonodispersesilicasphereswithmeandiameterof800nmusingtetrabutyltita
4、natebySttibermethod.Thethicknessofthetitaniacoatinglayerwasvariedfrom30amto100nmdependingontheconcentrationoftetrabutyltitanate.Aftercalciningthecore—shellparticlesinairat550℃for1h.anatasetitaniacoatinglayerwasobtainedsuitableforscatteringnearinfraredradiation.Thepreparat
5、ionrouteisamodificationofsol—gelmethod,i.e.ahydrothermalprocessisalsoinvolved.Additionally,itisasimpleroutewithoutanaddedcouplingagentorsurfactant.Keywords:hydrothermalsynthesis;core-·shellparticles;sol-gelprocess0Introductiontohighrefractiveindex.Inaddition,thelightscatt
6、eringabilityofSIC2@Ti02core—shellparticlesisstrongerPigmentedcoatingswithhighreflectivityagainstthansolidorhollowsphericaltitaniaparticles【5I.AnsolarirradiationcanbeusedtocontrolunwantedoptimizedpigmentcanattainmaximumdiffusesolarthermalheatingthatOccursasmaterialsabsorbs
7、unlightreflectanceandreducethepigmentvolumesuchasheatinbuilding,battleshiphulls,satelliteconcentrationrequired.Furthermore,forenvironmentalpanels.spacecraftt.reasonsitiSalsodesirabletominimizetheamountofCurrentlytitaniumdioxideisthemostusedtitaniainthepigment.commercialpi
8、gmentinthermalinfraredreflectingNear—infraredradiation(700~2500nm)accountscoatingsbecauseitefici
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