TAILIEUCHUNG - Synthesis of carbon aerogel material in atmosphere condition
The experimental results indicated that carbon aerogels obtained by using ambient pressure drying showed BET surface area, density, average pore size, total pore volumes in the range of – m2 /g, – g/cm3 , Å, and cm3 /g, respectively. The activation process with CO2 was influence to properties of carbon aerogels and it can improve the surface area reach about 779 m 2 /g. Thus, depending on the applications, carbon aerogels can be synthesized at different conditions. | Synthesis of carbon aerogel material in atmosphere condition Nghiên cứu khoa học công nghệ SYNTHESIS OF CARBON AEROGEL MATERIAL IN ATMOSPHERE CONDITION Le Anh Kien1*, Le Khac Duyen1,2, Pham Quoc Nghiep1, Le Thi Kim Phung2 Abstract: Porous carbon aerogels were prepared from resorcinol–formaldehyde monomers using sodium carbonate catalyst by ambient pressure drying technique. Aerogels were characterized by using SEM, XRD, TGA and nitrogen adsorption methods. The experimental results indicated that carbon aerogels obtained by using ambient pressure drying showed BET surface area, density, average pore size, total pore volumes in the range of – m2/g, – g/cm3, Å, and cm3/g, respectively. The activation process with CO2 was influence to properties of carbon aerogels and it can improve the surface area reach about 779 m2/g. Thus, depending on the applications, carbon aerogels can be synthesized at different conditions. Keywords: Aerogel; Carbon aerogel; Ambient pressure drying; Resorcinol–formaldehyde; Microstructure. 1. INTRODUCTION Aerogels are highly porous materials with low density and large specific surface area, derived via sol–gel technique. The first aerogels were made from waterglass–derived silica gels, employing solvent exchange and using supercritical conditions to remove the pore liquid [1]. The aerogels can be obtained as monoliths, granulates, films, or powders. Most notably aerogels are known for their extreme low densities (– g/cm3), high porosity (80–99%), and large surface area (400–1000 m2/g) [2–4]. Due to these special properties, aerogels have attracted much attention for they have large potential to be applied in many fields. First carbon aerogel was obtained by resorcinol–formaldehyde organic aerogel synthesis, and pyrolysis in the inert atmosphere by Pekala [2] at the end of 1980s. The properties of carbon aerogels were depended on the amount of .
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