A Versatile Method for Controlled Synthesis of Por.pdf
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A Versatile Method for Controlled Synthesis of Por.pdf

AVersatileMethodforControlledSynthesisofPorousHollowSpheres.pdf

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pubs.acs.org/Langmuir©2010AmericanChemicalSocietyAVersatileMethodforControlledSynthesisofPorousHollowSpheresYongqiangWang,†ChunjuanTang,†,‡QuanDeng,†ChanghaoLiang,†DickonH.L.Ng,§Fung-luenKwong,§HongqiangWang,†WeipingCai,†LideZhang,†andGuozhongWang*,††KeyLaboratoryofMaterialsPhysics,AnhuiKeyLaboratoryofNanomaterialsandNanotechnology,InstituteofSolidStatePhysics,ChineseAcademyofSciences,P.O.Box1129,Hefei230031,P.R.China,‡MathematicsandPhysicsDepartment,LuoyangInstituteofScienceandTechnology,Luoyang471023,P.R.China,and§DepartmentofPhysics,TheChineseUniversityofHongKong,Shatin,HongKong,P.R.ChinaReceivedMay8,2010.RevisedManuscriptReceivedJuly28,2010Aversatilemethodwasdevelopedtosynthesizenickelsilicate,silica,andsilica-nickelcompositeporoushollowspheresbyusingsilicaspheresastemplates.Inthepreparation,silicaspheresweretreatedwithamixtureofNiSO436H2OandNH33H2O.Thenickel-basedingredientreactedwiththesilicatoformashellwhilethealkalinesolutioncouldremovethesilicacore,thusformingthenickelsilicatehollowspheres.AfterthesesphereswerefurthertreatedwithhydrogeninreductionorwithHClinetching,theybecamesilica-nickelhollowspheresorsilicahollowspheres,respectively.Thesizesofthesehollowspheresdependedontheconcentrationoftheprecursor.Ourinvesti-gationalsofoundthattheirsurfacepropertiesormagneticpropertiescouldbetailoredbyadjustingthefabricationparameters.Introductionsurfactanttemplatetechnique.3,15-18Forexample,poroussilica-Thedesignandfabricationofinorganichollowsphereshavebasedmagneticcompositeparticleshavebeensynthesized-throughthesurfactant-assistedapproaches,andtheirproductsreceivedconsiderableattention.Thecoreshellstructurespro-19-22miseapplicationsincatalysis,batteries,gassensors,watertreat-arebeingusedindrugdeliveryandmagneticseparation.Thementagents,encapsulationdevices,controlledreleaseofmedicine,presenceofsurfactantiscriticallyimportantinguidingtheandtheformationofphotonicbandgapcrystals.1-6Porousformationoftheporoussilicahollowspheresandsilica-base