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1、萬方數(shù)據(jù)UniversityCode:10225RegisterCode:06C029DissertationfortheDegreeofMasterPreparationofnano-hydroxyapatiteandtheapplicationintoothpasteCandidate:Supervisor:AssociateSupervisor:AcademicDegreeAppliedfor:Speciality:DateofOraIExamination:University:LuoXimingFangGuizhenProf
2、.WuDeyiAdv.Eng.MasterIntroductionofMaterialScienceandEngineeringCollegeNov.,2005NortheastForestry萬方數(shù)據(jù)摘要沉淀法是制備納米顆粒的常用合成方法,具有工藝簡單、操作方便等優(yōu)點(diǎn)。羥基磷灰石是人體和動(dòng)物骨骼的基本組成,在臨床醫(yī)學(xué)應(yīng)用中,具有重要意義。本文以Ca(H2P04)2·H20和Ca(OH)2為原料,采用沉淀法制備羥基磷灰石粉末,在探討HAP前驅(qū)體煅燒工藝的同時(shí),分析了沉淀化學(xué)反應(yīng)過程中溶液pH值、表面活性劑對HAP的影響,并通過X射線衍
3、射儀、紅外光譜儀、磷鈣摩爾比和比表面積測定等驗(yàn)證,結(jié)果表明,反應(yīng)產(chǎn)物經(jīng)700℃煅燒2h可以制備出純凈的結(jié)晶良好的羥基磷灰石粉末,粉末顆粒直徑在50nm左右,分布均勻,化學(xué)分析表明,產(chǎn)物粉末的Ca,'P摩爾比為1.66801。含羥基磷灰石的牙膏具有特殊的功能,如,去牙斑性能、再礦化牙齒性能和美白牙齒性能,在國外進(jìn)行了大量的研究工作,并且已有含羥基磷灰石的牙膏出售。而我國相關(guān)的研究報(bào)導(dǎo)并不多見。本文制備了含羥基磷灰石的牙膏,并且研究了該牙膏的去牙斑(化學(xué)污點(diǎn))和美白性能。結(jié)果表明,該牙膏對去化學(xué)污點(diǎn)有效,并能在四周的時(shí)間使牙齒分別增白6%
4、(5%HAP)和18%(15%HAV),增亮7%(5%HAP)和20%(15%HAY)。關(guān)鍵詞羥基磷灰石;沉淀法;牙膏;去牙斑;增白萬方數(shù)據(jù)AbstractPrecipitationprocesswasusuallyusedtoproducenanoparticlebysynthesis.Itwastheadvantagethatprocessiseasyandoperationisconvenient.Hydroxyapatite(alsocalledasHAPbelow)asthebasicmineralcomponentinma
5、llandanimalboneplayanimportantroleinclinicalmedicine.ThisresearchinvolvesthatCa(H2POa)2‘H20andCa(OH)2WasusedasthematerialtoproduceHAPpowderbyprecipitationprocess.Beforetheheattreatmentprocesswasdiscussed,theeffectsofpHandsurfactantwasanalyzed.a(chǎn)nditisverifiedbytheapplica
6、tionofXRD,IN,Ca/PratioandBET.Asaresult,itWasshowedthatthewell-crystallizednano-HAPpowderwithanaveragediameterofabout50nlilcanbeobtainedbyheattreatmentat700"Cfor2hours.Nano—HAPpowderdistributeduniformlyandtheCa/Pratiosofthenano·HAPpowderswere1.66801.ToothpastecontainHAPh
7、avespecialfunction.Forexample,itcanremoveplaque,remineralizateandbeautifyteeth.ManyresearcheswerecarriedoutandthetoothpastewithHAPweresoldinothercountry.ButrelativeresearcheswereverylimitedinOurcountry.Inthisresearch,weprocessthetoothpastewithHAPandstudiedthespecialfunc
8、tionwhichremovedplaqueandbeautifiedteeth.Asaresult,thistoothpasteiseffectivetoremoveplaque.Italsohadthefimctio