期刊
JOURNAL OF COLLOID AND INTERFACE SCIENCE
卷 618, 期 -, 页码 259-269出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2022.03.087
关键词
Carbon aerogel; Monolith; High compressive strength; Thermal insulation; Organics absorption
资金
- National Natural Science Foundation of China [21576090, 21878091]
- Fundamental Research Funds for the Central Universities [222201718002]
In this study, large-sized monolithic carbon aerogels with excellent properties were fabricated using a simple method. The carbon aerogels exhibited low density, high strength, low thermal conductivity, and high adsorption capacity, showing great potential in high-temperature insulation and organics absorption.
Carbon aerogels exhibit high porosity, good electrical conductivity, and low thermal conductivity, but their practical applications are greatly hindered by their tedious preparation and inherent structure brittleness. Herein, monolithic carbon aerogels (MCAs) with low density and large size are prepared via a facile sol-gel polymerization of phenolic resin within melamine foam (MF), followed by ambient pressure drying and co-carbonization. During ambient pressure drying process, the MF matrix can deliver supporting force to counteract against the solvent evaporation surface tension, thus inhibiting volume shrinkage and shape deformation. Upon co-carbonization process, the MF matrix and organic aerogel could pyrolyze and shrink cooperatively, which could effectively prevent the brittle fracture of monolith. Therefore, large-sized MCAs (up to 250 x 250 x 20 mm) with low densities of 0.12-0.22 g.cm(-3) are obtained. The as-obtained MCAs possess high compressive strength (2.50 MPa), ultra-low thermal conductivity (0.051 W.m(-1).K-1 at 25 degrees C and 0.111 W.m(-1).K-1 at 800 degrees C), and high-volume organic absorption capability (77.3-88.0%, V/V). This facile and low-cost method for the fabrication of large-sized monolithic carbon aerogels with excellent properties could envision enormous potential for high-temperature thermal insulation and organics absorption. (C) 2022 Published by Elsevier Inc.
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