University of California scientists working at Los Alamos National Laboratory have recently demonstrated a novel method for chemically modifying and enhancing silica-based aerogels without sacrificing the aerogels unique properties. Aerogels are low-density, transparent materials used in a wide range of applications, including thermal insulation, porous separation media, inertial confinement fusion experiments and cometary dust capture agents.
Made of silica, one of the Earths most abundant materials, aerogels are as much as 99 percent air, giving them not only the highest thermal insulation value and highest surface area, but also the lowest acoustic conductivity and density of all known solid materials. The aerogels extraordinary thermal insulation ability makes them capable of withstanding temperatures in excess of a thousand of degrees Fahrenheit. Because they are composed mostly of air, there is little solid content available for maintaining the structural integrity of the aerogel, making them brittle.
In research reported today at the 228th national meeting of the American Chemical Society, Laboratory scientist Kimberly DeFriend describes a process for modifying silica aerogels with silicon and transition metal compounds using chemical vapor techniques to create a silicon multilayer or a mixed-metal oxide that enhance the current physical properties of aerogels for more demanding applications. With the addition of a silicon monolayer, an aerogels strength can be increased four-fold.
Todd Hanson | EurekAlert!
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