文档介绍：摘要核壳结构无机/聚合物纳米粒子以其独特的结构、性质引起了材料科学领域的广泛关注。它综合了无机物、聚合物和纳米材料的优良特性, 广泛应用于生物、医药、催化、电化学等众多领域。本文首先采用萃取法得到了油酸修饰的Ce02纳米粒子,继而用乳液聚合法成功制备出聚苯乙烯包覆ce02的核壳结构纳米粒子。通过透射电镜、x射线衍射、紫外一可见吸收光谱、红外吸收光谱、热分析等表征手段对样品的形貌和组成进行了分析。采用乳液聚合法制备了粒径均匀的聚苯乙烯微球,然后用表面沉积法成功制备了Ti02包覆聚苯乙烯的核壳粒子。通过透射电镜、x射线衍射、紫外一可见吸收光谱、红外吸收光谱、热分析等表征手段对样品的形貌和组成进行了详细地分析,获得了一些有意义的新结果,为进一步深入研究这类核壳粒子的性质及应用奠定了一定的基础。关键词:核壳结构纳米粒子ce02纳米粒子皿02纳米粒子乳液聚合表面定向沉积 Abstract Core—shell pound/posite materials have received increasing intefestsfmm scientistsin material science fieldfor theirs口ecial structure and materials possess thecharacteristics anic material, pOlymer and nanomaterial,aIld are applied tosuch fields asbiOlOgy,medicine,catalyst,electrochemistry,etc. Inthisdissenation,the Ce02 nanopartides modified by oleicacidwerc prepared by extraction,then theCe02 coated with e core—shell nanopanicles were synthesjzed bv emulsion core-sheU panicles werc svst啪atically characterized by TEM,XRD, UV·vis spectmmeter,FTIR,TG—D1A for a11alysis of their morphology ponents. Tbe pOlystyrene mjcfospbercs wefe pr印ared by emu】sjOn polymerization,and then ******@polystyrene core-shell nanopanicles were pfepared bv surface directional ,XRD,UV-Ⅵs spectmmetef,FnR,卫G- were used f研柚alysis oftheirmorphology and∞ new resultswere resultslay some foundations forfurther investigation of theproperties and applications of thiskindofcore—shell structure nanoDanicles. Key words:Core-shelI stmcturenanoparticIes Ce02 n蛐Oparticles ’n02nanOpar“cIes Emulsion polymerizanon Surfhce directionaI deposition 第一章绪论§,也叫超分子材料,是由粒径尺寸界于1—100砌之间的超细颗粒组成的固体材料。目前,人们把在1~100nm空间内制备、研究和工业化纳米材料,以及利用纳米尺度物质进行交叉研究和工业化的综合技术叫做纳米技术。当小粒子尺寸进入纳米量级(1~100Ilm)时,其本身具有量子尺寸效应、小尺寸效应、表面效应和宏观量子隧道效应,因而展现出许多特有的性质,在催化、滤光、光吸收、医药、磁介质及新材料等方面有广阔的应用前景,同时也将推动基础研究的发展。(1)小尺寸效应纳米粒子会出现一些诸如光吸收显著增加并产生吸收峰的等离子菇振平移、磁有序态向磁无序态转变、超导相向正常相转变等特有现象, 这些现象可称为小尺寸效应,当纳米粒子的尺寸与光波波长、德布罗意波长以及超导态的相干长度或透射深度等物理特征尺寸相当或更小时, 晶