【摘 要】
：
Porous crack-free C/SiO2/SiC ternary composite aerogel monolith was prepared by the one-pot sol-gel method using Catechol/formaldehyde (CF) and 3-aminopropyltriethoxysilane as the organic and inorgani
【机 构】
：
College of Materials Science and Engineering, Nanjing Tech University, Nanjing P.R.China 210009;Jian
【出 处】
：
2016’中国溶胶-凝胶学术研讨会暨国际论坛
论文部分内容阅读
Porous crack-free C/SiO2/SiC ternary composite aerogel monolith was prepared by the one-pot sol-gel method using Catechol/formaldehyde (CF) and 3-aminopropyltriethoxysilane as the organic and inorganic precursors.It was derived from the Catechol/formaldehyde/silica (CF/SiO2) aerogel via CO2 supercritical drying, followed by subsequent carbonization (800 ℃/3h) and carbothermal reduction (1300 ℃, 1400℃ and 1500℃).The evolution of physical properties, crystal structure, morphology and pore structures from CF/SiO2 to C/SiO2/SiC aerogel was investigated by different methods.XRD and XPS techniques both revealed that SiCphase began to emerge when heat treatment reached up to 1400 ℃, and it became obvious at 1500 ℃.The bulk densities of CF/SiO2, C/SiO2 and 1400 and 1500-C/SiO2/SiCcomposite aerogel were 0.231 g/cm3, 0.226 g/cm3, 0.329 g/cm3 and 0.249 g/cm3, respectively, with the corresponding mass loss of 49.4%, 18.0 % and 21.2 %.The network structures become more homogeneous after carbothermal reduction, and SiO2 phase and SiC phase existed as particles and nanowires.The specific surface areas of CF/SiO2, C/SiO2,1400 and 1500-C/SiO2/SiC are 170.67 g/m2, 261.97 g/m2, 523.64 g/m2 and 746.87 g/m2, respectively.Carbothermal reduction mechanism was also discussed in this article based on the experiment and characterization results.
其他文献
Fiber is a new form of macroscopic graphene nanomaterials besides powder, film and aerogel.Graphene fibers are much more advantageous in terms of mechanical strength, electrical conductivity, and phys
Flexible fabric with remarkable UV blocking was deemed as the feasible route to shield human body against ultraviolet radiation.In this paper, graphene nanoplate (GNP) as an UV absorber to functionali
This presentation will provide an overview of the research activities within the Department of Civil Engineering at Monash University (Australia) on nano reinforced infrastructural materials.In partic
Cement, as one of the key construction materials, plays a very important role in the social and economic development, yet it also brings great challenge due to its large consumption in natural resourc
Graphene oxide (GO) nanosheets are prepared by oxidation of graphite followed by sonication exfoliation.FTIR and AFM results indicate that the GO nanosheets have a thickness of about 6 nm and that the
The unique optoelectronic properties of graphene make it an ideal platform for a variety of photonic applications.Owing to its high carrier mobility, gapless spectrum, and frequency-independent absorp
The perfect graphene is believed to be the strongest material.However, the useful strength of large-area graphene with engineering relevance is determined by its fracture toughness, rather than the in
Fiber reinforced composites (FRCs) are commonly used in the aerospace, automotive, marine, and construction industries.Interfacial adhesion is a determining parameter for the material properties and s
超级隔热材料二氧化硅气凝胶被广泛用于各种航天器、飞行器的热防护中。添加遮光剂或纤维能大大改善其在高温下的隔热性能。本文中假设遮光剂颗粒为球形,掺杂纤维为无限长圆柱,通过计算遮光剂及纤维的辐射特性得到不同温度下最优掺杂粒径,并在复合材料等效热导率最小时得到不同温度下的最佳掺杂量。研究发现：遮光颗粒和纤维的最佳掺杂直径随温度增加而减小,掺杂量随温度增加而增加,研究的四种遮光剂(碳黑、SiC、ZrO2和
Graphene doped AZO thin films were prepared by sol-gel method with using metal salts and reduced grapheneoxide(rgo) as raw materials and using ethylene glycol dimethyl ether as solvent,though spin coa