tailieunhanh - Characteristics of carbon aerogel at variation in pyrolysis conditions

The properties and structure of carbon aerogel samples were investigated by nitrogen adsorption, four-point probe method and XRD diffraction. The results showed that carbon aerogel had structure between amorphous and graphite state. | SCIENCE & TECHNOLOGY DEVELOPMENT, Vol 19, 2016 Characteristics of carbon aerogel at variation in pyrolysis conditions Le Khac Duyen Pham Quoc Nghiep Le Anh Kien Institute for Tropicalisation and Environment, ITE, Ho Chi Minh City, Vietnam (Manuscript Received on July, 2016, Manuscript Revised on September, 2016) ABSTRACT Carbon aerogel was obtained by pyrolysis carbon aerogel had structure between of organic aerogel by ambient pressure drying technique. The effect of pyrolysis conditions on amorphous and graphite state. The highest specific surface area was 800 m2/g at pyrolysis characteristics of carbon aerogel such as density, specific surface area and conductivity temperature of 700oC. The pore-size was distributed in microporous, with the maximum was studied. The properties and structure of total pore volume of cm3/g. The electrical carbon aerogel samples were investigated by nitrogen adsorption, four-point probe method conductivity of carbon aerogel was highest at pyrolysis temperature of 800-900oC with the and XRD diffraction. The results showed that value in the range of S/cm. Keywords: Aerogel, carbon aerogel, pyrolysis, porous materials, microstructure. 1. INTRODUCTION Carbon aerogels were very interesting monolithic materials with a large of potential applications because of their versatile properties, such as low density, high surface area, high porosity, low electrical resistivity and controllable structure characteristics [1, 2]. Carbon aerogels had been prepared from the different organic aerogel sources in many previous studies. Al‐Muhtaseb and Ritter [3] synthesized carbon aerogel from resorcinol– formaldehyde organic aerogel at different drying conditions. The experiments data showed that properties of carbon aerogel were affected of many factors such as the catalyst concentration, the initial gel pH, the concentration of solids in Trang 88 the sol, the drying method and the conditions .

• Hoá học
• Characteristics of carbon aerogel
• Variation in pyrolysis conditions
• The properties and structure
• Amorphous and graphite state
• Carbon aerogel samples