By a News Reporter-Staff News Editor at Science Letter -- Investigators publish new report on Hydrazines. According to news reporting originating in Austin, Texas, by NewsRx journalists, research stated, "Single-Pt nanoparticles (NPs) can be detected electrochemically by measuring the current-time (i-t) response associated with both hydrazine oxidation and proton reduction during individual Pt NP collisions with noncatalytic Hg- and Bi-modified Pt ultramicroelectrodes (Hg/Pt and Bi/Pt UMEs, respectively). At Hg/Pt UMEs, the i-t response for both hydrazine oxidation and proton reduction consists of repeated current 'spikes' that return to the background level as Hg poisons the Pt NP after collision with the Hg/Pt UME due to amalgamation and deactivation of the redox reaction."
The news reporters obtained a quote from the research from the University of Texas, "Furthermore, at a Hg/Pt UME, the applied potential directly influences the interfacial surface tension (electrocapillarity) that also impacts the observed i-t response for single-Pt NP collisions for proton reduction that exhibits a faster decay of current (0.7-4 ms) to background levels than hydrazine oxidation (2-5 s). Because the surface tension of Hg is lower (-0.9 V), Pt NPs possibly react faster with Hg (amalgamate at a faster rate), resulting in sharp current spikes for proton reduction compared to hydrazine oxidation. In contrast, a stepwise 'staircase' i-t response is observed for proton reduction for single-Pt NP collisions at a Bi/Pt UME."
According to the news reporters, the research concluded: "This different response suggests that electrostatic forces of negatively charged citrate-capped Pt NPs also influence the i-t response at more negative applied potentials, but the Pt NPs do not poison the electrochemical activity at Bi/Pt UMEs."
For more information on this research see: Influence of the Redox Indicator Reaction on Single-Nanoparticle Collisions at Mercury- and Bismuth-Modified Pt Ultramicroelectrodes. Langmuir, 2013;29(48):15100-15106. Langmuir can be contacted at: Amer Chemical Soc, 1155 16TH St, NW, Washington, DC 20036, USA. (American Chemical Society - www.acs.org; Langmuir - www.pubs.acs.org/journal/langd5)
Our news correspondents report that additional information may be obtained by contacting R. Dasari, Univ Texas Austin, Dept. of Chem, Austin, TX 78712, United States. Additional authors for this research include B. Walther, D.A. Robinson and K.J. Stevenson (see also Hydrazines).
Keywords for this news article include: Texas, Austin, Hydrazines, United States, Organic Chemicals, North and Central America
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