Journal ArticleDOI
Low-density organic and carbon aerogels from the sol–gel polymerization of phenol with formaldehyde
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In this paper, 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.Abstract:
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 10–15 nm, which define numerous mesopores less than 50 nm. The highest measured BET surface area and mesopore volume of the carbon aerogels obtained reached 714 m 2 g −1 and 1.84 cm 3 g −1 , respectively.read more
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References
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Reporting physisorption data for gas/solid systems with special reference to the determination of surface area and porosity (Recommendations 1984)
TL;DR: Mise au point comportant des definitions generales et la terminologie, la methodologie utilisee, les procedes experimentaux, les interpretations des donnees d'adsorption, les determinations de l'aire superficielle, and les donnes sur la mesoporosite et la microporosite.
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Organic aerogels from the polycondensation of resorcinol with formaldehyde
TL;DR: In this paper, the polycondensation of resorcinol with formaldehyde under alkaline conditions results in the formation of surface functionalized polymer "clusters" which are processed under supercritical conditions to obtain low density, organic aerogels.
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On the mechanism of possible influence of heteroatoms of nitrogen, boron and phosphorus in a carbon matrix on the catalytic activity of carbons in electron transfer reactions
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Porous structure of organic and carbon aerogels synthesized by sol-gel polycondensation of resorcinol with formaldehyde
TL;DR: In this article, the mesopore volume of a resorcinol-formaldehyde (RF) aerogel was found to increase by pyrolyzing the aerogels having a monodisperse porous structure.
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New organic aerogels based upon a phenolic-furfural reaction☆
TL;DR: In this paper, a new type of organic aerogel based upon a phenolic-furfural (PF) reaction was recently discovered, which can be converted to a carbonized version upon pyrolysis in an inert atmosphere.