Journal ArticleDOI
Re-evaluation of the thiocyanate dosimeter for pulse radiolysis
George V. Buxton,Craig R. Stuart +1 more
TLDR
In this article, the super-Fricke dosimeter was used as a secondary standard for the thiocyanate dosimeter in O2-saturated water and the results were improved to 3.47 ± 0.06.Abstract:
The thiocyanate dosimeter (10–2 mol dm–3 SCN– in O2-saturated water) has been standardised against the super-Fricke dosimeter (10–2 mol dm–3 FeII in O2-saturated 0.4 mol dm–3 H2SO4) using the hexacyanoferrate(II) dosimeter [5 × 10–3 mol dm–3 Fe(CN)64– in O2-saturated water] as a secondary standard. On the basis that G(FeIII)= 1.67 × 10–6 mol J–1 and IµFeIII= 220.4 m2 mol–1 at 304 nm and 25 °C in the super-Fricke dosimeter, we obtain GIµ[Fe(CN)63–]=(3.47 ± 0.06)× 10–5 m2 J–1 at 420 nm and GIµ(SCN)2˙–=(2.59 ± 0.05)× 10–4 m2 J–1 at 475 nm. These values remain unchanged when the solutions are saturated with air instead of O2 and are doubled in N2O-saturated solution.read more
Citations
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Common intermediates in the OH-radical-induced oxidation of cyanide and formamide
TL;DR: In this article, it was shown that in the absence of O2 less than half of radical 1 decays by disproportionation to produce cyanate and formamide, while in the presence of O 2 O 2 −− −−− − − − -decays by O 2−−-elimination.
Journal ArticleDOI
A study of light induced surface reactions of sildenafil citrate on hybrid AgCl/Ag nanoparticle dimers by surface enhanced Raman scattering and pulse radiolysis techniques
Abhishek Das,Abhishek Das,Nandita Maiti,Nandita Maiti,Akshay C. Dhayagude,Arup Kumar Pathak,Ridhima Chadha,Suman Neogy,Sudhir Kapoor,Sudhir Kapoor +9 more
TL;DR: In this article, the authors used transmission electron microscopy (TEM), selected area electron diffraction (SAED) and UV-vis absorption property to probe morphology, lattice structure and optical property of synthesized AgCl/Ag NPDs.
Journal ArticleDOI
Calculated and measured transient product yields in pulse radiolysis of aqueous solutions: Concentration dependence
TL;DR: In this paper, a pulse radiolysis of aqueous solution was modeled by using 54 equations for the reaction of water radio-lysis intermediates with carefully selected rate coefficients, and yields of products formed in the hydrated electron + solute and hydroxyl radical+solute reactions were calculated and compared with the measured yields in wide concentration range.
Journal ArticleDOI
Gamma radiolysis of hydrophilic diglycolamide ligands in concentrated aqueous nitrate solution.
Gregory P. Horne,Andreas Wilden,Stephen P. Mezyk,Liam Twight,Michelle Hupert,Andrea Stärk,Willem Verboom,Bruce J. Mincher,Giuseppe Modolo +8 more
TL;DR: Overall, the radiolysis of hydrophilic DGAs in concentrated, aqueous nitrate solutions is significantly slower and less structurally sensitive than under pure water conditions, similar to their lipophilic analogs.
Journal ArticleDOI
Dopamine quinone chemistry: a study of the influence of amide, amidine and guanidine substituents [-NH-CX-Y] on the mode of reaction
TL;DR: In contrast to the transient formation of spirocyclic products by other ortho-quinones derived from dopamine derivatives, e.g., , the product is stable and has been isolated and fully characterised.
References
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Journal ArticleDOI
Critical Review of rate constants for reactions of hydrated electrons, hydrogen atoms and hydroxyl radicals (⋅OH/⋅O− in Aqueous Solution
TL;DR: In this article, the rate constants for over 3500 reaction are tabulated, including reaction with molecules, ions and other radicals derived from inorganic and organic solutes, and the corresponding radical anions, ⋅O− and eaq−, have been critically pulse radiolysis, flash photolysis and other methods.
Journal Article
Critical review of rate condtants for reaction of hydrated electrons, hydrogen atoms and hydroxyl radicals in aqueous solution
Journal ArticleDOI
Yield for the scavenging of hydroxyl radicals in the radiolysis of nitrous oxide-saturated aqueous solutions
TL;DR: In this article, the thiocyanate dosimeter was calibrated against the Fricke system to obtain a value of 46,400 +-600 (molecules/100 eV) for the product of yield and extinction coefficient of (SCN)/sub 2/O-saturated solutions.
Journal ArticleDOI
Track effects in radiation chemistry. Concentration dependence for the scavenging of hydroxyl by ferrocyanide in nitrous oxide-saturated aqueous solutions
TL;DR: In this paper, the radiation chemical yield for oxidation of ferrocyanide by OH produced in the fast electron radiolysis of N/sub 2/O-saturated aqueous solutions was found to increase from a low concentration limiting yield of 5.2 to values in excess of 6.7.