Hot-spot bubbles ease glassmaking.
But Suslick and his colleagues have now made amorphous iron using utrasound. High-intensity pulses of sound cause bubbles to form, expand and then implode, creating short-lived hot spots that reach temperatures of about 5,200 kelvins, says Suslick. Their rapid cooling helps create metallic glasses.
By zapping solutions of powdered iron pentacarbonyl for three hours with ultrasound, the researchers made amorphous iron that assayed 96 percent pure by weight, they report in the Oct. 3 NATURE. Other methods yield no better than 80 percent.
The scientists also note that this amorphous iron worked better than crystalline iron powder as a catalytic agent in converting carbon monoxide and hydrogen to hydrocarbons. They suggest the larger surface area of the amorphous form enhances the chemical reactivity.
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|Title Annotation:||new method for making metallic glasses|
|Date:||Oct 19, 1991|
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