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New Process For Making Much-sought Iron Nanospheres

Date:
February 20, 2007
Source:
American Chemical Society
Summary:
Using a process that creates bubbles as hot as the surface of the sun, chemists are reporting development of a new method for making hollow hematite (iron oxide) nanospheres.
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Using a process that creates bubbles as hot as the surface of the sun, chemists are reporting development of a new method for making hollow hematite (iron oxide) nanospheres.

The University of Illinois at Urbana-Champaign's Kenneth S. Suslick and Jin Ho Bang describe the synthesis of these iron nanoparticles in a report scheduled for the Feb. 28 issue of the Journal of the American Chemical Society, a weekly publication.

Hollow nanospheres of metals and other inorganic materials are generating great interest because of their unusual properties and potential applications in drug delivery, electronic components, catalysts and other products.

"We believe that this procedure will be easily extended to prepare other hollow inorganic materials," the researchers note. In the past, production of hollow hematite nanospheres required a time-consuming process and use of toxic hydrofluoric acid.

The new process uses sonochemistry, in which high-frequency sound waves are focused into a solution containing an iron compound and carbon nanoparticles. Those sound waves create tiny bubbles in the liquid. The collapse of those bubbles causes intense local heating with temperatures estimated at 9,000 F, which is nearly as hot as the surface of the sun. The sonochemical process forms iron spheres around the carbon nanoparticles. On exposure to air, the iron rapidly oxidizes, which burns away the carbon core, leaving hematite spheres one thousandth the diameter of a red blood cell.


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The above post is reprinted from materials provided by American Chemical Society. Note: Materials may be edited for content and length.


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American Chemical Society. "New Process For Making Much-sought Iron Nanospheres." ScienceDaily. ScienceDaily, 20 February 2007. <www.sciencedaily.com/releases/2007/02/070220034345.htm>.
American Chemical Society. (2007, February 20). New Process For Making Much-sought Iron Nanospheres. ScienceDaily. Retrieved July 31, 2015 from www.sciencedaily.com/releases/2007/02/070220034345.htm
American Chemical Society. "New Process For Making Much-sought Iron Nanospheres." ScienceDaily. www.sciencedaily.com/releases/2007/02/070220034345.htm (accessed July 31, 2015).

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