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ID:33752995
大小:6.81 MB
页数:41页
时间:2019-02-28
《纳米羟基磷灰石的制备及其在牙膏上的应用》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、万方数据UniversityCode:10225RegisterCode:06C029DissertationfortheDegreeofMasterPreparationofnano-hydroxyapatiteandtheapplicationintoothpasteCandidate:Supervisor:AssociateSupervisor:AcademicDegreeAppliedfor:Speciality:DateofOraIExamination:University:LuoXimingFangGuizhenProf
2、.WuDeyiAdv.Eng.MasterIntroductionofMaterialScienceandEngineeringCollegeNov.,2005NortheastForestry万方数据摘要沉淀法是制备纳米颗粒的常用合成方法,具有工艺简单、操作方便等优点。羟基磷灰石是人体和动物骨骼的基本组成,在临床医学应用中,具有重要意义。本文以Ca(H2P04)2·H20和Ca(OH)2为原料,采用沉淀法制备羟基磷灰石粉末,在探讨HAP前驱体煅烧工艺的同时,分析了沉淀化学反应过程中溶液pH值、表面活性剂对HAP的影响,并通过X射线衍
3、射仪、红外光谱仪、磷钙摩尔比和比表面积测定等验证,结果表明,反应产物经700℃煅烧2h可以制备出纯净的结晶良好的羟基磷灰石粉末,粉末颗粒直径在50nm左右,分布均匀,化学分析表明,产物粉末的Ca,'P摩尔比为1.66801。含羟基磷灰石的牙膏具有特殊的功能,如,去牙斑性能、再矿化牙齿性能和美白牙齿性能,在国外进行了大量的研究工作,并且已有含羟基磷灰石的牙膏出售。而我国相关的研究报导并不多见。本文制备了含羟基磷灰石的牙膏,并且研究了该牙膏的去牙斑(化学污点)和美白性能。结果表明,该牙膏对去化学污点有效,并能在四周的时间使牙齿分别增白6%
4、(5%HAP)和18%(15%HAV),增亮7%(5%HAP)和20%(15%HAY)。关键词羟基磷灰石;沉淀法;牙膏;去牙斑;增白万方数据AbstractPrecipitationprocesswasusuallyusedtoproducenanoparticlebysynthesis.Itwastheadvantagethatprocessiseasyandoperationisconvenient.Hydroxyapatite(alsocalledasHAPbelow)asthebasicmineralcomponentinma
5、llandanimalboneplayanimportantroleinclinicalmedicine.ThisresearchinvolvesthatCa(H2POa)2‘H20andCa(OH)2WasusedasthematerialtoproduceHAPpowderbyprecipitationprocess.Beforetheheattreatmentprocesswasdiscussed,theeffectsofpHandsurfactantwasanalyzed.anditisverifiedbytheapplica
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
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