Publications by authors named "A S Botana"
Superconductivity in infinite layer nickelates Nd_{1-x}Sr_{x}NiO_{2} has so far been achieved only in thin films, raising questions on the role of substrates and interfaces. Given the challenges associated with their synthesis it is imperative to identify their intrinsic properties. We use resonant inelastic x-ray scattering to investigate the influence of the SrTiO_{3} capping layer on the excitations of Nd_{1-x}Sr_{x}NiO_{2} (x=0 and 0.
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- The study investigates the impact of hydrogen incorporation in layered superconducting nickelate films and its potential link to superconductivity.
- Films are created by converting a stable parent compound into the desired phase using a reducing agent like CaH, but achieving highly crystalline nickelate films remains challenging.
- Findings show that hydrogen incorporation is minimal across various samples, both superconducting and non-superconducting, suggesting that it’s not essential for achieving superconductivity in these nickelate systems.
This paper serves as a Part II follow-up of our research investigations performed on the molecular structures of silver(I)-fluoride (SF) and diammine-silver(I) fluoride (SDF) complexes in solution-based commercial products for clinical application, their precise chemical compositions, and their nature in aqueous solution, the latter including rapid fluoride-exchange processes at the silver(I) ion centre monitored by F NMR analysis (Part I). Part I of this series also explores the mechanisms of action (MoA) of these complexes, and is therefore largely focused on their chemical reactions with constituents of human saliva, which has access to their sites of application. Such reactions were found to slowly promote the generation of potentially physiologically-active Ag/AgCl nanoparticles from primarily-generated discoloured silver(I) chloride (AgCl) precipitates, a process involving salivary electron-donors such as thiocyanate and L-cysteine.
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- The study investigates the molecular structure, composition, and interactions of silver(I)-diammine fluoride (SDF) and silver(I)-fluoride (SF) solutions, which are used in treating dental caries, highlighting the lack of prior research in this area.
- Advanced techniques such as high-resolution NMR spectroscopy and SEM analyses revealed differences in the fluoride exchange dynamics of SDF and SF, along with the generation of silver chloride nanoparticles (CSNPs) when treated with human saliva.
- Results suggest that the SDF product contains high levels of fluoride and ammonia, and that CSNPs formed from the interaction of these solutions with saliva incorporate various biomolecules, indicating a complex interplay when used in dental treatment.