欢迎您！东篱公司
退出
-
申报数据库
-
立项数据库
-
成果数据库
-
项目获奖数据库
中文摘要：
将二氧化硅溶胶和间苯二酚-甲醛溶液混合，经溶胶凝胶反应得到复合湿凝胶. 再经超临界干燥和炭化得到炭-二氧化硅复合气凝胶. 分别用氢氟酸刻蚀和空气烧蚀复合气凝胶中的二氧化硅和炭，得到结构完整的炭气凝胶和二氧化硅气凝胶. 复合湿凝胶经常压干燥、炭化和氢氟酸刻蚀能得到炭干凝胶. 利用透射电镜和低温氮气吸附对上述凝胶的微结构进行了表征. 结果表明：复合气凝胶中，炭和二氧化硅纳米网络各自连续并相互嵌套. 由于二氧化硅纳米网络的支撑作用，复合凝胶在超临界干燥和高温炭化过程中体积收缩减小，网络塌陷降低. 所得炭气凝胶具有高比表面（934m^2/g）和高孔容（3.9cm^3/g）的特点.
英文摘要：
Hybrid hydrogels were synthesized by sol-gel polymerization of resorcinol and formaldehyde added by colloidal silica solutions. Carbon/silica hybrid aerogels were prepared from the hydrogels by supercritical drying and carbonization. Carbon aerogels and silica aerogels were obtained by removing silica with HF etching and carbon with air burning from the hybrid aerogels respectively. Carbon xerogels were prepared by ambient drying, carbonization and HF etching from the hydrogels. The microstructures of the four kinds of gels were characterized by TEM and N2 adsorption. It is found that the carbon and silica frameworks are continuous and interpenetrated each other. The silica framework can improve the strength of hybrid gels, which can decrease the volume shrinkages by preventing collapse of the hybrid framework during supercritical drying and carbonization, resulting in carbon aerogels with high specific surface area of 934m^2/g and large total pore volume of 3.9cm^3/g.
同期刊论文项目
同项目期刊论文
The superior electrochemical performance of oxygen-rich activated carbons prepared from bituminous c
Molecular design of polymer precursors for controlling microstructure of organic and carbon aerogels
Effect of template and precursor chemistry on pore architectures of triblock copolymer-templated mes
Modification of polystyrene-based activated carbon spheres to improve adsorption of dibenzothiophene
Influence of nitrogen hetero-substitution on the electrochemical performance of coal-based activated
Fabrication of hierarchical porous carbide-derived carbons by chlorination of mesoporous titanium ca
Effect of pore structure on the electrochemical performance of coal-based activated carbons in non-a
Preparation of polystyrene-multiwalled carbon nanotube composites with individual-dispersed nanotube
Composite biocoating of hydroxyapatite/Al2O3 on titanium formed by Al anodization and electrodeposit
Asymmetric capacitance response from the chemical characteristics of activated carbons in KOH electr
Capacitive matching of pore size and ion size in the negative and positive electrodes for supercapac
New concept of in situ carbide-derived carbon/xerogel nanocomposite materials for electrochemical ca
Facile synthesis of hierarchically structured Fe(3)O(4)/carbon micro-flowers and their application t
Ion Transport Behavior in Triblock Copolymer-Templated Ordered Mesoporous Carbons with Different Por
Genetic algorithm-least squares support vector regression based predicting and optimizing model on c
Preparation of Highly- Conductive CNTs/Polyaniline Composites through Plasma Pretreating and In-situ
Hollow carbon nanospheres prepared by carbonizing polymethylmethacrylate/polyacrylonitrile core/shel
Surface modification of pitch-based spherical activated carbon by CVD of NH3 to improve its adsorpti
Preparation and microstructure control of carbon aerogels produced using m-cresol mediated sol-gel p
期刊信息
位置：