摘要
Thenanoscaletitaniacoatedsilicawaspreparedviaatwo-stepprecipitatingapproach,wherethenanoscalesilicanucleiwerefirstpreparedbypassinganaqueoussolutionofsodiumsilicatethroughanion-exchangeresinbed,thencoatedwiththeprecipitationfromhydrolyzedbutyltitanateinanethanol-hexanemixtureatalowpHvalueinthepresenceofpoly(ethyleneoxide)polyaminesalt(PPA)atahightemperatureof90℃.Inthesecond-stepprecipitatingprocess,thespontaneouslyprecipitatedtitaniashellonthesilicanucleiwasstabilizedinthesuspensionsolutionwiththehelpoftheadsorptionofPPAontheparticles.Apossibleprecipitatingmechanismwassuggested.Furthermore,theamorphoustitaniashellcouldundergocrystallizationfromtheamorphoustotheanatasestructureatahightemperatureof650℃,andafurtherphasetransitionfromtheanatasetotherutilestructureinthedifferentsinteringprocessesatarisingtemperatureof750℃.
出版日期
2002年01月11日（中国期刊网平台首次上网日期，不代表论文的发表时间）
