文献类型：专利

英文题名：Manufacture of carbon-silicon composite aerogel involves mixing hydroxyphenol and aqueous solution of formaldehyde, adding silica solution, placing in water bath, displacing aquagel by organic solvent, drying, carbonizing, cracking

作者：LING L;ZHANG R;CHEN L;LONG D;LU F

机构：[1]UNIV EAST CHINA SCI & TECHNOLOGY

申请号：CN101288837-A

申请日：2008-05-26

公开日：2008-10-22

语种：英文

收录：DERWENT

摘要：NOVELTY - Manufacturing carbon-silicon composite aerogel comprises (1) mixing and dissolving hydroxyphenol and aqueous solution of formaldehyde as the reagents, adding silica solution particles to mix into the reaction monomer, then placing in water bath to obtain the aquagel; (2) drying the aquagel by critical point drying method to obtain dry organic aerogel after the aquagel obtained in step (1) is displaced for 3 days by organic solvent; (3) carbonizing and cracking the dry organic aerogel obtained in step (2) in charring furnace to obtain the needed carbon-silicon composite aerogel. USE - The method is useful for manufacturing carbon-silicon composite aerogel (claimed). ADVANTAGE - The carbon-silicon composite aerogel prepared by this method has high specific surface, high pore capacity, and low density. DETAILED DESCRIPTION - Manufacturing carbon-silicon composite aerogel comprises (1) mixing and dissolving hydroxyphenol and aqueous solution of formaldehyde with mass percent of 36-40 wt.% as the reagents under catalyzing condition of basic catalyst at 25-40 degrees C, adding the silica solution particles to evenly mix into the reaction monomer, where the mole ratio of hydroxyphenol to the formaldehyde to silica gel is 1:(1-3):(2-3), mole ratio R/C of hydroxyphenol to the catalyst is 500-2000, grain diameter of silicon dioxide in silica solution is 7-12 nm, and reaction monomer is mixed into water according to proportion of adding 35-60 g reaction monomer into 100 ml water; then placing in water bath for 2-5 days at 60-90 degrees C to obtain the aquagel; (2) drying the aquagel by critical point drying method to obtain the dry organic aerogel after the aquagel obtained in step (1) is displaced for 3 days by organic solvent at 25-40 degrees C where the organic solvent is anhydrous methyl alcohol, ethanol, or normal propyl alcohol; (3) carbonizing and cracking the dry organic aerogel obtained in step (2) in the charring furnace for 5-7 hours at 700-900 degrees C under the condition of the inert gases to obtain the needed carbon-silicon composite aerogel.