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| 3. |
- Jones, D. L., et al.
(författare)
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High dynamic range VLBI observations of NGC 6251
- 1986
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Ingår i: Astrophysical Journal. - Philadelphia, United States : Institute of Physics Publishing, Inc. - 0004-637X .- 1538-4357. ; 305:2, s. 684-697
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Tidskriftsartikel (refereegranskat)
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| 4. |
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| 5. |
- Walmsley, T., et al.
(författare)
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Characterizing the multi-dimensional reaction dynamics of dihalomethanes using XUV-induced Coulomb explosion imaging
- 2023
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Ingår i: Journal of Chemical Physics. - 0021-9606. ; 159:14
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Tidskriftsartikel (refereegranskat)abstract
- Site-selective probing of iodine 4d orbitals at 13.1 nm was used to characterize the photolysis of CH2I2 and CH2BrI initiated at 202.5 nm. Time-dependent fragment ion momenta were recorded using Coulomb explosion imaging mass spectrometry and used to determine the structural dynamics of the dissociating molecules. Correlations between these fragment momenta, as well as the onset times of electron transfer reactions between them, indicate that each molecule can undergo neutral three-body photolysis. For CH2I2, the structural evolution of the neutral molecule was simultaneously characterized along the C-I and I-C-I coordinates, demonstrating the sensitivity of these measurements to nuclear motion along multiple degrees of freedom.
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| 6. |
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| 7. |
- Martín-Yerga, Daniel, et al.
(författare)
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Correlative Voltammetric Microscopy: Structure-Activity Relationships in the Microscopic Electrochemical Behavior of Screen Printed Carbon Electrodes.
- 2019
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Ingår i: ACS Sensors. - : American Chemical Society (ACS). - 2379-3694.
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Tidskriftsartikel (refereegranskat)abstract
- Screen-printed carbon electrodes (SPCEs) are widely used for electrochemical sensors. However, little is known about their electrochemical behavior at the microscopic level. In this work, we use voltammetric scanning electrochemical cell microscopy (SECCM), with dual-channel probes, to determine the microscopic factors governing the electrochemical response of SPCEs. SECCM cyclic voltammetry (CV) measurements are performed directly in hundreds of different locations of SPCEs, with high spatial resolution, using a sub-µm sized probe. Further, the localized electrode activity is spatially-correlated to co-located surface structure information from scanning electron microscopy and micro-Raman spectroscopy. This approach is applied to two model electrochemical processes: hexaammineruthenium (III/II) ([Ru(NH3)6]3+/2+), a well-known outer-sphere redox couple; and dopamine (DA) which undergoes a more complex electron-proton coupled electro-oxidation, with complications from adsorption of both DA and side-products. The electrochemical reduction of [Ru(NH3)6]3+ proceeds fairly uniformly across the surface of SPCEs on the sub-µm scale. In contrast, DA electro-oxidation shows a strong dependence on the microstructure of the SPCE. By studying this process at different concentrations of DA, the relative contributions of (i) intrinsic electrode kinetics and (ii) adsorption of DA are elucidated in detail, as a function of local electrode character and surface structure. These studies provide major new insights on the electrochemical activity of SPCEs and further position voltammetric SECCM as a powerful technique for the electrochemical imaging of complex, heterogeneous and topographically rough electrode surfaces.
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| 9. |
- Viggiano, D, et al.
(författare)
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Mild cognitive impairment and kidney disease: clinical aspects
- 2020
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Ingår i: Nephrology, dialysis, transplantation : official publication of the European Dialysis and Transplant Association - European Renal Association. - : Oxford University Press (OUP). - 1460-2385. ; 35:1, s. 10-17
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Tidskriftsartikel (refereegranskat)
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| 10. |
- White, Jai, et al.
(författare)
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Crystallographic facet and alkali metal cation dependent glycerol electrooxidation on polycrystalline Pd probed by SECCM
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Annan publikation (övrigt vetenskapligt/konstnärligt)abstract
- Glycerol is considered an important platform chemical for value-added organic chemical synthesis. The electrooxidation of glycerol in aqueous media provides a facile synthesis method to generate chemicals important for pharmaceutical and medical industries. Therefore, critical knowledge regarding the most active catalysts for the glycerol electrooxidation reaction (GEOR) is necessary for such a process to be viable. The GEOR on noble metals is well studied but there are significant gaps in the literature regarding the activity of specific crystal facets, particularly in the case of Pd. Through SECCM electrochemical mapping correlated with EBSD mapping to identify grain orientations, a much larger picture of the GEOR on Pd catalysts can be formed. Here, the facet dependent activity for the GEOR on Pd, evaluated through cyclic voltammetry using SECCM with co-located EBSD, is reported for the first time in alkaline solutions of KOH, NaOH and LiOH at pH 13. NaOH is shown to result in the highest performance for the GEOR and for all three electrolytes, Pd (111) provides the highest activity, Pd (001) provides intermediate to high activity and that Pd (101) is the least active. The facet dependent activity for the GEOR is directly mirrored for Pd oxidation and the subsequent PdO reduction process. Suggesting these two processes are signifiers towards catalytic activity for the GEOR.
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