刘晓辉文献综述汇报.ppt

刘晓辉文献综述汇报.ppt

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刘晓辉2013年年4月月21日日本综述主要内容本综述主要内容：

本综述是郑南峰课题组刚刚在本综述是郑南峰课题组刚刚在Nanoscale上发表题为上发表题为Self-templatingsynthesisofhollowmesoporoussilicaandtheirapplicationsincatalysisanddrugdelivery的综述的综述文章文章综述了空心介孔二氧化硅（包括综述了空心介孔二氧化硅（包括yolk/shell结构）的合成及应用。

合成方面着重强调结构）的合成及应用。

合成方面着重强调了了自身模板法自身模板法，包括，包括表面保护表面保护-腐蚀法、基于结构差异的选择性腐蚀法以及阳离子表面腐蚀法、基于结构差异的选择性腐蚀法以及阳离子表面活性剂辅助自模板法活性剂辅助自模板法等三大类。

应用方面则主要介绍了等三大类。

应用方面则主要介绍了催化和药物传输方面催化和药物传输方面的应用。

的应用。

Hollowmesoporoussilicamaterialshavebeenintensivelypursuedbecauseoftheiruniquepropertiesforvariousapplications.Yolk/shellstructuredhollowmesoporoussilicawithfunctionalcoresinsidetheirhollowinteriorcanfurtherbroadentheapplicationsofhollowmesoporoussilica.Self-templatingstra-tegyhasbeendevelopedasoneofthemostimportantstrategiestoeffectivelyfabricatehollowmesoporoussilicaandtheiryolk/shellcounterparts.Inthisfeaturearticle,weprovideanoverviewofadvancesinself-templatingsynthesisofhollowmesoporoussilicabasedonthefollowingthreestrategies:

surface-protectedetching,structuraldifference-basedselectiveetching,andcationicsurfac-tantassistedself-templating.Wethendiscusssomeimportantapp-licationsoftheseself-templatingstrategiesderivedhollowmesoporoussilica,suchasnanoreactorsforconfinedcatalysisandmultifunctionalplatformforcombinedtherapy.Finally,someperspectivesforthefuturedevelopmentofthisactiveresearchfieldareprovided.AbstractAbstract1.Introduction1.Hollowstructuresarehighlyattractiveinbothfundamentalresearchandpracticalapplications.2.Uptodate,templatingmethodisprobablythemosteffectiveandgeneralroutetoprepareHMS.Incomparison,asanevidentadvantageofhard-templatingmethods,theshapeandcavitysizesofHMScanbeeasilyandpreciselycontrolledbytheprefabricatedtemplates.3.ithasbeenwelldemonstratedthattheencapsulationoffunctionalnanoparticlesinhollowmaterialsnotonlyeffectivelyenhancesthestabilityofthesenanoparticles,butalsointroducenewfunctionalitiesforhollowmaterials.yolk/shellHMS,hasthusattractedtremendousinterestinrecentyears.However,thesynthesisandapplicationsofyolk/shellHMSarestillfacedwithchallenges.4.Inordertoobtainyolk/shellHMSwithmorecompositionaldiversity,severalothermethodshavethusbeenexploited,includingship-in-bottlemethods,partialetchingcoreofcore/shellcoresilica,multiplenanocasting,andsoft-templatingmethod.Howeverintrinsicdisadvantagesofthesemethods,suchaspoorcontrolofthegrowthoretchingofcore,time-consumingandcumbersomesyntheticprocedures,andlowefficiency.Toovercomethesedisadvantages.“self-template”.5.Inthisfeaturearticle,wefocusontherecentresearchprogressinthesynthesisandapplicationsofHMSbasedonself-templatingmethods.2.Self-templatingstrategiesforsynthesisofHMSSchematicillustrationsforsurface-protectedetchingstrategy（a）andstructuraldifference-basedselectiveetchingstrategy（b,c）forthesynthesisofHMSfromsSiO2.C18TMS:

n-octadecyltrimethoxysilane,TSD:

N-3-（trimethoxysilyl）-propylethylene-diamine.Fig.12.1.Surface-protectedetchingTEMimagesshowingthemorphologyofPVPcoatedsSiO2afteretchingbyNaOHfor（a）0h;（b）1h;（c）2h45min;and（d）3h.Allscalebarsare200nm.Fig.22.2.Structuraldifference-basedselectiveetchingTEMimages:

sSiO2C18/SiO2（a,b）andHMSobtainedbytreatingsSiO2C18/SiO2in0.6MNa2CO3solutionat80Cfor0.5h（c,d）.Fig.3又如：

又如：

AuAPTES/SiO2SiO2（a）TEMimageofsSiO2TSD/SiO2sSiO2,TEMimage（b）andSEMimages（c,d）ofyolk/shellSiO2HMSobtainedbyHFetchingofsSiO2TSD/SiO2sSiO2,（e）TEMimageofHMSobtainedbyHFetchingofTSD/SiO2sSiO2.内层内层sSiO22.3.Cationicsurfactantassistedself-templatinghighlydispersibleHMSparticlesaredesiredinsomeapplications,suchasbiomedicine.SincecationicsurfactantsinMCM-41-typeOMSarereadilyremovedbyamildextractionoperation,usingcationicsurfactantstodirecttheformationoforderedmesoporoussilicashellisexpectedtoprovideanopportunitytopreparehighlydispersibleHMSInordertoobtainHMSwithorderedmesoporousshell,chosenquaternaryammoniumcationicsurfactantsasthestructure-directingagents,duetotheirfollowingproperties:

（1）theexcellentsolubility,

（2）highcriticalmicelletemperature（CMT）,and（3）thestrongelectrostaticinteractionwithnegativelychargedsilicaspeciesinbasicconditions.（4）after-treatment2.3.1.Cationicsurfactantassistedselectiveetching（strategy1）目标：

目标：

preparehighlydispersibleHMS、orderedmesoporoussilicashell.TEMimagesofsilicaspheressSiO2-250（a）andHMSS-W-250（b）,（c,d）N2sorptionisothermsandtheporesizedistributionofsSiO2-250and25HMSS-W-250.HMSS-W-250hasarathernarrowsizedistributioncenteredat2.5nm（Fig.6d）,similartothatofMCM-41-typeOMSobtainedbyusingCTABasthestructure-directingagentTEMimagesshowtheeffectofCTABconcentrationontheconversionofsSiO2toHMSS