The fast metal exchange reaction between Au and AgAu nanoclusters in solution at -20 °C has been studied by in situ X-ray absorption spectroscopy (time resolved quick XAFS) in transmission mode. A cell was designed for this purpose consisting of a cooling system, remote injection and mixing devices. The capability of the set-up is demonstrated for second and minute time scale measurements of the metal exchange reaction upon mixing Au/toluene and AgAu/toluene solutions at both Ag K-edge and Au L-edge. It has been proposed that the exchange of gold and silver atoms between the clusters occurs via the SR(-M-SR) (n = 1, 2; M = Au, Ag) staple units in the surface of the reacting clusters during their collision. However, at no point during the reaction (before, during, after) evidence is found for cationic silver atoms within the staples. This means that either the exchange occurs directly between the cores of the involved clusters or the residence time of the silver atoms in the staples is very short in a mechanism involving the metal exchange within the staples.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1039/c7cp08272j | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Pure CO and impure CO-SO-NO-O reactions with carbon storage site underlying seals: Coaly mudstones and carbonate cemented sandstones.
Sci Total Environ
January 2025
School of the Environment, University of Queensland, QLD, Australia.
The transition to net zero emissions requires the capture of carbon dioxide from industrial point sources, and direct air capture (DAC) from the atmosphere for geological storage. Dissolved CO has reactivity to rock core, and while the majority of previous studies have concentrated on reservoir rock or cap-rock reactivity, the underlying seal formation may also react with CO. Drill core from the underlying seal of a target CO storage site was reacted at in situ conditions with pure CO, and compared with an impure CO stream with SO, NO and O that could be expected from hard to abate industries.
View Article and Find Full Text PDFUsing damage functions to map heritage climatology at a global scale.
Sci Total Environ
January 2025
University College London, Central House, 14 Upper Woburn Place, London WC1H 0NN, UK. Electronic address:
This paper investigates heritage climatology through global analysis of damage functions for collections, aiming to learn about the reliability of these functions and the field itself. It addresses the growing interest in geospatial analysis of climate hazards for cultural heritage, proposing parameters that refine climate-related deterioration processes. Using global daily climate data from 1991 to 2020, the study assesses damage functions reliant on temperature and relative humidity inputs, including damage functions for paper and metals, alongside indices for humidity fluctuations and mould growth.
View Article and Find Full Text PDFNi-Mo nanostructure alloys as effective electrocatalysts for green hydrogen production in an acidic medium.
RSC Adv
January 2025
Department of Chemistry, Faculty of Science, Suez Canal University Ismailia 41522 Egypt +201113343594.
Achieving a net-zero emissions economy requires significant decarbonization of the transportation sector, which depends on the development of highly efficient electrocatalysts. Electrolytic water splitting is a promising approach to this end, with Ni-Mo alloys emerging as strong candidates for hydrogen production catalysts. This study investigates the electrodeposition of Ni and Ni-Mo nanostructured alloys with high molybdenum content onto low-carbon steel cathodes using a novel alkaline green lactate bath.
View Article and Find Full Text PDFMetallic PtC monolayer as a promising hydrogen evolution electrocatalyst.
Phys Chem Chem Phys
January 2025
Department of Optoelectronic Information of Science and Engineering, School of Science, Jiangsu University of Science and Technology, Zhenjiang 212100, China.
Reasonable design of hydrogen evolution reaction (HER) electrocatalysts with low Pt loading and excellent catalytic performance is a key challenge in finding efficient and cost attractive catalysts. Pt with its unique d-electrons provides new opportunities for the development of HER catalysts when it forms compounds with highly earth-abundant C. Herein, we focused on designing highly efficient catalysts composed of Pt and C elements using first-principles structure search simulations, identifying four stability PtC monolayers.
View Article and Find Full Text PDFA comprehensive review of heavy metals (Pb, Cd, Ni) removal from wastewater using low-cost adsorbents and possible revalorisation of spent adsorbents in blood fingerprint application.
Environ Technol
January 2025
Department of Chemical Sciences, University of Johannesburg, Johannesburg, South Africa.
An increasing amount of water pollution is being caused by an increase in industrial activity. Recently, a wide range of methods, including extraction, chemical coagulation, membrane separation, chemical precipitation, adsorption, and ion exchange, have been used to remove heavy metals from aqueous solutions. The adsorption technique is believed to be the most highly effective method for eliminating heavy metals from wastewater among all of them.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!