کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9778171 | 1510573 | 2005 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Low-density organic and carbon aerogels from the sol-gel polymerization of phenol with formaldehyde
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موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
سرامیک و کامپوزیت
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چکیده انگلیسی
Low-density organic and carbon aerogels are prepared from the sol-gel polymerization of cheap phenol with formaldehyde using NaOH as the base catalyst, followed by ethanol supercritical drying. The effects of the preparation conditions, including the mole ratio of phenol to NaOH (P/C), the mole ratio of phenol to formaldehyde (P/F), phenol-formaldehyde (PF) concentration and gelation temperature, on the gelation time, the bulk density as well as the physical and chemical structures of the resultant organic and carbon aerogels were studied. The experimental results of TEM and nitrogen adsorption showed that the phenol derived organic and carbon aerogels have a three-dimensional network that consists of interconnected bead-like particles with diameters of approximately 10-15Â nm, which define numerous mesopores less than 50Â nm. The highest measured BET surface area and mesopore volume of the carbon aerogels obtained reached 714Â m2Â gâ1 and 1.84Â cm3Â gâ1, respectively.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Non-Crystalline Solids - Volume 351, Issues 10â11, 15 April 2005, Pages 915-921
Journal: Journal of Non-Crystalline Solids - Volume 351, Issues 10â11, 15 April 2005, Pages 915-921
نویسندگان
Dingcai Wu, Ruowen Fu, Zhuoqi Sun, Zhiquan Yu,