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August 28, 2019 03:30 am

Chemists Discover Water Microdroplets Spontaneously Produce Hydrogen Peroxide

An anonymous reader quotes a report from Phys.Org: Stanford researchers report Aug. 26 in Proceedings of the National Academy of Sciences that microscopic droplets of water spontaneously produce hydrogen peroxide. The discovery could pave the way for greener ways to produce the molecule, a common bleaching agent and disinfectant, said Richard Zare, the Marguerite Blake Wilbur Professor in Natural Science and a professor of chemistry in the Stanford School of Humanities and Sciences. The discovery was made serendipitously while Zare and his lab were studying a new, more efficient way to create gold nanostructures in tiny water droplets known as microdroplets. To make those structures, the team added an additional molecule called a reducing agent. As a control test, Zare suggested seeing if they could create gold nanostructures without the reducing agent. Theoretically that should have been impossible, but it worked anyway -- hinting at an as yet undiscovered feature of microdroplet chemistry. The team eventually traced those results to the presence of a molecule called hydroxyl -- a single hydrogen atom paired with an oxygen atom -- that can also act as a reducing agent. That equally unexpected result led Katherine Walker, at the time a graduate student in Zare's lab, to wonder whether hydrogen peroxide -- a molecule with two hydrogen and two oxygen atoms -- was also present. To find out, Zare, Walker, staff scientist Jae Kyoo Lee and colleagues conducted a series of tests, the simplest of which involved spraying ostensibly pure water microdroplets onto a surface treated so that it would turn blue in the presence of hydrogen peroxide -- and turn blue it did. Additional tests confirmed that water microdroplets spontaneously form hydrogen peroxide, that smaller microdroplets produced higher concentrations of the molecule, and that hydrogen peroxide was not lost when the microdroplets recombined into bulk water. The researchers suggest that a strong electric field near the surface of water microdroplets in air triggers hydroxyl molecules to bind into hydrogen peroxide.

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