胆酸盐与Gemini表面活性剂复合物构建的纳米纤维和囊泡VIP专享VIP免费

[Article]www.whxb.pku.edu.cn物理化学学报(WuliHuaxueXuebao)ActaPhys.-Chim.Sin.2013,29(11),2415-2421NovemberReceived:July18,2013;Revised:September23,2013;PublishedonWeb:September24,2013.∗Correspondingauthor.Email:xchen@sdu.edu.cn;Tel:+86-531-88365420.TheprojectwassupportedbytheNationalNaturalScienceFoundationofChina(20973104,21033005,21373127).国家自然科学基金(20973104,21033005,21373127)资助项目©EditorialofficeofActaPhysico-ChimicaSinicadoi:10.3866/PKU.WHXB201309243胆酸盐与Gemini表面活性剂复合物构建的纳米纤维和囊泡朱丽杰黄丹丹李钦堂许冠辰陈晓*(山东大学胶体与界面化学教育部重点实验室,济南250100)摘要:Gemini表面活性剂(CsH2s-α,ω-(Me2N+CmH2m+1Br-)2,m-s-m)与胆汁酸盐(BS)利用静电作用构建超分子复合物,通过改变m-s-m和BS的结构,可以分别得到纳米纤维和囊泡状超分子聚集体.聚集体的形貌、结构和性质分别通过偏光显微镜(POM)、透射电子显微镜(TEM)、场发射扫描电子显微镜(FE-SEM)、X射线粉末衍射(XRD)及其它测试手段进行了表征.研究发现,通过改变m-s-m的烷基链长和间隔基团的长度,以及BS胆甾骨架上羟基的数目和位置,聚集体的形貌会发生明显的变化,聚集体主要依靠静电相互作用,并在疏水作用及氢键的协同作用下形成,本文的结果将有助于更好地理解离子自组装机理,并对超分子聚集体的设计提供新的思路.关键词:自组装;Gemini表面活性剂;胆酸盐;聚集体;超分子作用中图分类号:O648NanofibersandVesiclesSelf-AssembledfromGeminiSurfactantComplexeswithBileSaltsZHULi-JieHUANGDan-DanLIQin-TangXUGuan-ChenCHENXiao*(KeyLaboratoryofColloidandInterfaceChemistryoftheMinistryofEducation,ShandongUniversity,Jinan250100,P.R.China)Abstract:Nanofibersandvesiclesarefabricatedinaqueoussolutionbyself-assemblyofcomplexesofcationicGeminisurfactants((CsH2s-α,ω-(Me2N+CmH2m+1Br-)2,m-s-m)andanionicbilesalts(BS).Theirmorphology,structure,andpropertiesarecharacterizedbypolarizedopticalmicroscopy(POM),transmissionelectronmicroscopy(TEM),field-emissionscanningelectronmicroscopy(FE-SEM),andX-raypowderdiffraction(XRD).Themorphologyoftheseaggregateswassignificantlyinfluencedbyminorstructuralchangesofthebuildingblocks,includingthespacerandalkylchainlengthsofm-s-m,andthehydroxylgroupnumberandpositiononthesteroidskeletonoftheBS.Theformationoftheseaggregatesisconsideredtoarisemainlyfromelectrostaticinteractions,withcontributionsfromhydrogenbondingandhydrophobicinteractions.Theresultsobtainedmaybehelpfulforunderstandingthemechanismsofionicself-assemblyandaidthedesignofnovelsupramolecularaggregates.KeyWords:Self-assembly;Geminisurfactant;Bilesalt;Aggregate;Supramolecularinteraction1IntroductionOrderedsupramolecularaggregatesformedthroughself-assemblyareamongthepromisingcandidatesforfunctionalmoleculardevicesandnanomaterials.1Extensiveeffortshavebeendirectedtosuchmaterialstoexploretheirnovelproper-tiesandfunctions,whicharereadilyavailablefromspecificas-semblyofmolecularcomponents.2-6Variousdrivingforces,likeelectrostaticinteraction,hydrogenbonding,π-πinterac-tion,vanderWaalsforce,host-guestinteraction,metal-ligandcoordination,amphiphilicassociation,andhydrophobicinterac-tion,havebeenadoptedforfabrication.Asacontinuationofourpreviousstudies,7-9thepreparation2415ActaPhys.-Chim.Sin.2013Vol.29ofself-assemblednanofibersorvesicleswithbuildingblocksofaseriesofcationicGeminisurfactants(m-s-m)andanionicbilesalts(BS)withchemicalstructuresshowninScheme1hasbeenreportedhere.Bothofthesetwocomponentsexhibitun-usualpropertiesandaggregationbehaviorsinaqueoussolu-tionsfortheiruniquestructures....