金纳米粒子杂化超分子水凝胶的制备与性能  

Preparation and Properties of Supramolecular Hydrogels Hybridized with Au Nanoparticles

作　　者：赵三平[1] 曹孟杰[1] 李利燕[1] 徐卫林[1] 

机构地区：[1]武汉纺织大学新型纺织材料绿色加工及其功能化教育部重点实验室,武汉430073

出　　处：《化学学报》2011年第4期492-496,共5页Acta Chimica Sinica

基　　金：湖北省教育厅(No.Q20101603);国家重点基础研究发展规划(No.2009CB526402)资助项目

摘　　要：在制备水溶性硫辛酸酯封端的甲氧基聚乙二醇-聚己内酯嵌段共聚物(MPEG-PCL-ALA)单层包覆金纳米粒子的基础上,在水溶液中,利用α-环糊精(α-CD)与单层包覆金纳米粒子的包合作用构建杂化超分子水凝胶.透射电子显微(TEM)照片显示,金纳米粒子的尺寸为6～8 nm.X射线衍射测试表明,所制备的水凝胶中含有α-环糊精与MPEG-PCL嵌段共聚物包合形成的多聚准轮烷的特征衍射峰(2θ=19.7°).紫外-可见吸收光谱显示,单层包覆金纳米粒子的水溶液及其与α-CD包合形成的水凝胶在525 nm处均出现表面等离子共振吸收峰,单层包覆金纳米粒子溶液存放3个月后,其表面等离子共振吸收峰未发生明显红移,表明单层包覆金纳米粒子的水溶液具有较好的稳定性.On the basis of the preparation of water-soluble Au nanoparticles protected with methoxypolyethylene glycol-poly（ε-caprolactone） block copolymer end-capped with a-thioctate ester （MPEG-PCL- ALA）, hybrid supramolecular hydrogels were fabricated by the inclusion complexation between MPEG-PCL monolayer-protected Au nanoparticles and α-cyclodextrin （α-CD） in aqueous solution. TEM photograph showed that the size of gold nanoparticles was about 6-8 nm. XRD results confirmed that there existed the characteristic peak （2θ=19.7°） of polypseudorotaxanes formed from MPEG-PCL block copolymer with a-CD in as-obtained hydrogels. UV-visible spectra displayed that the surface plasma resonance absorption peaks appeared at about 525 nm for both aqueous solution of monolayer-protected Au nanoparticle and its hydrogel with α-CD, and there is no shift of the surface plasma resonance absorption peak after three-month storage of its aqueous solution, showing a good colloidal stability.

关 键 词：单层包覆金纳米粒子 环糊精 包合作用 超分子水凝胶 表面等离子共振 

分 类 号：TB383.1[一般工业技术—材料科学与工程]