钯掺杂碳气凝胶的制备及表征  

Preparation and Characterization of Pd-doped CA

作　　者：周莹[1,2] 王朝阳[2] 唐永建[2] 付志兵[2] 刘淼[2] 

机构地区：[1]西南科技大学材料科学与工程学院,绵阳621010 [2]中国工程物理研究院激光聚变研究中心,绵阳621900

出　　处：《材料导报》2010年第12期103-106,共4页Materials Reports

基　　金：中国工程物理研究院科学技术发展基金(2009A0302020)

摘　　要：采用溶胶-凝胶合成、离子交换、溶剂交换、CO2超临界干燥技术制备了2,4-二羟基苯甲酸钯-甲醛有机气凝胶,并经1050℃高温碳化处理得到其碳气凝胶,获得了最高理论密度为21%、最低理论密度为2%的气凝胶,发现随着溶液浓度的降低和酸性的增强,气凝胶的凝胶时间延长。采用热重分析、扫描电子显微镜、X射线衍射、红外光谱对样品进行了分析,观察了掺钯前后其断面形貌,掺钯后碳气凝胶中除具有碳的微晶外,还具有明显的晶体峰。2, 4-dihydroxybenzoic acid palladium formaldehyde aerogels are prepared by sol-gel synthesis, ion exchange, solvent exchange, CO2 supercritical drying technology, and the carbon aerogels are obtained through car- bonized at 1050℃ high temperature, the maximum theoretical density is 21%, the lowest theoretical density is 2 %. The gel time of aerogels becomes longer with the decrease of the concentration and the increase of acid . The samples are characterized by thermal gravimetric analysis, scanning electron microscopy, X-ray diffraction and infrared spec- troscopy, the cross-section morphology before and after palladium doped is observed, and Pd-doped carbon aerogel not only has carbon microcrystalline structure, hut also has obvious crystal peak.

关 键 词：碳气凝胶 掺杂 溶胶-凝胶 离子交换 超临界 

分 类 号：TQ153[化学工程—电化学工业] TK91[动力工程及工程热物理]