Thermal Conductivity of Monolithic Organic Aerogels

Abstract

The total thermal conductivity lambda of resorcinol-formaldehyde aerogel monoliths has been measured as a function of density rho in the range from rho = 80 to 300 kilograms per cubic meter. A record-low conductivity value in air at 300 K of lambda approximately 0.012 watt per meter per kelvin was found for rho approximately 157 kilograms per cubic meter. Caloric measurements under variation of gas pressure as well as spectral infrared transmission measurements allowed the determination of solid conductivity, gaseous conductivity, and radiative conductivity as a function of density. The development of such low conductivity materials is of great interest with respect to the substitution of environmentally harmful insulating foams made from chlorofluorocarbons.

Aerogels derived from multifunctional organic monomers

“…This ultrastructure and the low Z (atomic number) composition are responsible for the unique optical, thermal, electrical, and acoustic properties of organic aerogels. For example, resorcinol-formaldehyde aerogels were recently found to have lower thermal conductivities than silica aerogels [13].…”

Predicting alloy vibrational mode properties using lattice dynamics calculations, molecular dynamics simulations, and the virtual crystal approximation

“…[1][2][3][4][5][6][7][8][9][10] Disordered lattices are a subgroup of disordered materials where the atomic positions follow a lattice structure but the constituent species are spatially random. Examples include isotopic solids, where the species have the same electronic structure but small mass variations, 11,12 and alloys, our focus here, where at least two distinct species are present.…”

Effect of Activation Temperature on CO2Capture Behaviors of Resorcinol-based Carbon Aerogels

“…16, 17 Pekala prepared CAs by carbonization of a resorcinolformaldehyde (RF) aerogel. 18,19 Such carbon materials can be prepared by hard-and soft-template methods. A hard template can be made up of a fragmented solid material of regular shape.…”