2014年加拿大會(huì)議-國(guó)際會(huì)議口頭報(bào)告講稿

2014年加拿大會(huì)議-國(guó)際會(huì)議口頭報(bào)告講稿2014年加拿大會(huì)議-國(guó)際會(huì)議口頭報(bào)告講稿2014年加拿大會(huì)議-國(guó)際會(huì)議口頭報(bào)告講稿(雖然短短5頁(yè),這可是本主一個(gè)多月的工作結(jié)晶，往對(duì)大家有幫助，別忘了給贊)P1Greeting：Thanksforintroduction.Helloeveryone.Wellcometomytalk.Thanktheorganisersforgivingmethisopportunity.Self-introduction:Mynameis［yourname]aphdstudentatgroupofProf.［youradvisor]whoissittingthere.Wecomefrom[yourUniversity］,China.Asyouknow，nanjingisacitywithalonghistorywhichlocatesinthesouth-eastofChina.

Subject：Today，I’mgoingtotalkaboutourrecentworkabout［yourtitle].P2Outline：Mypresentationisdividedintofourparts:Background；Morphologycontrol；Catalysis&Drug-delivery;Summary.P3（Introductionofthebackground)Inthepast,numerousresearcheshavebeendonefocusingonmicro—andmacro—scale.But，thereisacentralissue，howtheunderstandingatthemicro—scalecanenablepredictionsoffunctionalbehavioratthemacro-scale.Then,anewawareness，alsoanopenconcept‘mesoscalescience’hasrecentlyemergedtolinkthemicro—tothemacroscale.Itisclearthatporousmaterialshavegreatpotentialduetotheirvariouscomposition，structureandmorphology.（Mytheme）Inthistalk，wefocusoncontrollablesynthesisofmorphologyanduseitasmesoscaletoobtainthequantificationandoptimizationoftherelevantprocesses。P4（CatalysisVSyourmaterials）Asforheterogeneouscatalysis，itiswidelyknownthatmacroscopicparameterssuchastheyield，selectivity,productsandrateofchemicalreactionsarerelatedtothenano—structureofcatalystincludingmorphology，size,poreandcomposition.Becausenano-structurecanproducevariouseffectsonchemicalprocesssuchas….P5（Drug—deliveryVSyourmaterials）Andwhenitcomestodrugdelivery，themorphologyandsizeofporousmaterialsaretwomainsubjects.(youcanrefertosomereferencestosupportyouridea)Prof.Moufoundthatrod-likeparticleshavemany優(yōu)勢(shì)（pointing）comparedtospheremorphology.Prof.Tangstudiedmesoporoussilicananoparticleswithaspectratiofrom1to5asdrug-carrier。ShefoundthattheARofMSNsaffectgreatlytheseaspects。vivobiodistribution，clearance，andbiocompatibilityandsoon。Inaddition,sheproposedthatparticleswithalargerARgenerallyaffectcellstoalargerdegreecomparedtoMSNswithasmallerAR.Therefore,giventhisresult，itisnecessarytoexpandtheshapee?ectstudiestoawiderange。P6Periodicmesoporousmaterialshavebeenwidelystudiedinmanyfields,suchascatalysis,sensor，drug-deliveryandseparation.BecausetheyhaveLargeSurfaceArea,AdjustablePoreSize，HighThermalStabilityandFlexibleFramework。Especially，theFlexibleFrameworkmakethecontrollablesynthesisofmorphologypossible.P7(emphasizetheimportanceofyourwork）Thus，weusemesoporoussilicaasGoodCarrierOrSupport.Next，wetrytoobtainthecontrollablesynthesisofmorphologyandsize.Afterthat,wecanintroduceavarietyoforganicorinorganicmodification.Finally,thefunctionedmesoporousmaterialswithcontrollablemorphologyandsizecanpalyasagoodmeso—scaletoexpectthequantificationandoptimizationoftherelevantprocessesbetweenmicro-scaleandmacro—scale。However,comparedtothesynthesisofmesoporoussilica,thetwopartsaremoredifficult，whichnotonlyneedaflexiblemethod,butalsoneedfinecontrolofsynthesisconditions.Therefore,itisstillachallengeforresearchers.P8（introductionofsynthesisprocess）Next，wearegoingtointroduceourworkaboutmorphologycontrol。Briefly，inthesynthesisprocess，weusetwosurfactants。weput…and…intoconcentrated…。Untilthesolutionbecametransparent，…wereaddedintothesolution,weaddsiliconsourceandheteroatomsourceundercertainconditions。Aftherthefollowingtreatments:Hydrothermaltreatment,centrifugation，drynessandcalcination。Finally，wegettheproduct.Obviously，thisprocessissimple,andthetwo—surfactantsarecheapandeasy—obtained.So,ithasgreatpotentialforscale-upproduction。P9（myaimsofmywork)Inordertogetfullcontroloflength，diameter,andporesizeofnanotube,wetrytochangesynthesisconditions…andsoon。However,inthisdual—surfactantsystem，wefoundthemorphologywasaffectedgreatly…。P10（introductionofmydetailedwork)Firstofall,wetesttheeffectsoftheamountof.。.onmorphology.Weincreasetheamountof.。。andkeep.。。constant。TheSEMimagesfromatogshowwiththeincreasingof...，themorphologystartsbylongparticles，then,changesintoshortones.Thecorrespondingsizesarelisted.Moreover,TEMimageofA2demonstratetwodimensionhexagonalstructureandthehighlyorderedhoneycomb-likestructure.P11Inaddition，weuseXRDandN2physisorptiontogetinformationofmesostructure.FromXRDandporesizedistributionpatterns。wecanseethatwiththeincreasingof.。。，therearetwosectionsinthepatterns。FromA0toA2，the100peaksshifttolowerangel,meanwhile，thecorrespondingporesizebecomebig。AndfromA3toA7，the100peaksmovetohighangel，however,theporesizearealmostthesamewithA0。And,althoughthepeaksofA6andA7becomebroadandweak,allsamplesgivesimilarnitrogensorptionamountandTEMpatternofA7showthechannelsremainintactwhichindicatesthatthemesoporesareremaineddespiteoftheincreasingamountof..。.And,thebroadpeaksofA6andA7mayattributetothedereasingsizeofparticles.P12Next，westudytheeffectsofamountof.。.onthemorphologyofmaterials。Wekeeptheamountof.。.constant，anddecreasetheamountof。...Asshownhere，Wecanseethatthechangingtrendofmorphologyisthesamewiththeeffectofincerasingamountof....TEMpatternofB1synthesizedwithlowamountof.。.showscollapsedchannels.P13Inthisslide，Iwilltalkaboutthepossiblereason。Asshownhere,wecanalsofoundwiththedecreaseof...,thepeaksbecomeweakandbroad。And,atthesametimetheNitrogensorptionamountsdecrease.Takentogether，weconcludethatthethedecreasingamountof。。.maynobebenificialforproducinggoodchannel。P14Takingintoconsiderationtheeffectsofmolarratioof。.。to。.。，weproposethatinthebinarysurfactantssystemtheroleof。.。isastemplatetoformmesoporestructure，while。.。asregulatortocontrolthemorphology。Wethinkthatatlowamountof。。.，。。。and.。.formcoupledmicelles。Whileathighamontof。.。,separatedmicellesoccur.Themorphologytransformationwasreferedtoa…。P15-P16［onthebasisofyourwork，youshouldproposeapropermechanismtorationalizeyourresults]Inthepresentstudy，…。Thereexisttwokindsofinteractions。.betweenthepositivelycharged…and…，and…between….Itisclearthat。.canacceleratethecondensationofsilicateanion。Onthecontrary,…h(huán)inderthisprocess.Thus，thereexistsacompetitiverelationshipbetweenEandH。AndthecompetitionbetweenthetwokindsofinteractionsareresponsibleforthecompetitionbetweentheGibbsfreeenergyofthemesophaseformation(ΔG)andthesurfacefreeenergy（F).Atlowamountof…,ΔGisdominant.Thelongnanotubewillbeformed。Whenweincreasetheamountof.。.,theproportionofthehydrogenbondsincreased.Asaresult，themorphologywithbigcurvaturewillbeformedinordertominimizethesurfaceenergy。Andinthiscasethemesostructureisdeterminedby…of…。Inthiscase,wereferedtoaworkofHiroakiImai。Firstofall，theassemblybetween…occur,whilethe…attachonthe…theparticles。Inthiscase，the…comefromthetemplate….whilethewallthiknessofporeswasdeterminedbythebalancebwtweenHandE.So，themorphologytransformationhappenedfromlongtoshortnanotube，andfinallyspheremorphology。P17P18Inaddition，wefoundthattheinnerporesizeofmaterialscouldalsoberegulatedbyusingquaternaryammoniumcationicchangingsurfactantwithdifferentlengthofcarbonchain（TTAB:C14,OTAB:C18)，butunderoptimumconditions。Asshownhere,theobtainedC14andC18samplesshownanotube—likemorphologyandnarrowporesize.ThemostprobableporesizesofC14andC18are2。17and3。25nm,respectively。P19Moreover，wealsofoundthatthemorphologyandsizeofmaterialscanberegulatedbysystematicalchangingofexperimentalconditions,suchas..。/..。,ammoniaconcentration，amountof。。.，stirringandtemperature，wealsoobtainnanotubeswithdifferentsizeandmorphology。Forexample,weobtainsampleS1bychangingammoniaconcentrationandtemperature。P20Inashortsummary,byusingthisdual-surfactantsystem,weareabletoproducehoneycomb—likesilicananotubewithcontrollablemorpholgyatthree—dimension，withwithlengthchangingfrom100nmto5μm;diameterfrom50to600nm;poresizefrom2.17to3。15nm。TheARofmaterialsarefoundintherangeof1to100.Therefore，weofferedaflexibleandeffectivestrtegyforthecontrollablesynthesisofhoneycomb—likesilicananotube。P20Nextpart,wetesttheapplicationofmaterialsascatalystsupport。Forthispurpose,.Wepreparedcopper—modifiednanotubereactor。P21Asshownhere,weobtaineddifferentnanoreactorswithsimilarouterdiameterandincreasinglength。Whentheyareusedtocatalyzedirecthydroxylationofbenzene。Aninterestingresultwasobtainedthatthecatalyticactivitiesincreasewiththelengthofnanotubereactor.P22Moreover,wealsoanalyzethemesostructurebyXRDandN2physisorptionandtestthecoppercontentandstatebyICPandUV.FromtheUVpattern，wecanseethatthecopperstatesofcopperinthreesamplesaresimilar.P23Andthecatalyticresultsandmesostructuredataarealllistedintable1。Moreover，thedecreasingspecificsurfacegenerallyleadtothedecreasingofcatalyticperformance.Weconcludethattheincreasingcatalyticactivitiesmaycomefromthe…。Tosupportthat，wealsopreparediron—containingnanotubereactorwithdifferentlength.Asshownhere.Whenweuseiron-dopednanotubestocatalyzephenolhydroxylation.Thesameconclusionwasob