Publications by authors named "P Guttmann"
Article Synopsis
- - Layered lithium-rich transition metal oxides are attractive for high-energy-density lithium batteries but face issues like capacity fade and voltage drop due to structural deterioration and chemical changes over time.
- - The study examines how individual atoms to larger particles undergo changes during battery operation, uncovering complex internal reactions that contribute to oxygen loss and phase transformation.
- - Key findings show that defects in oxygen and rapid changes during lithium movement lead to irreversible structural issues, which ultimately result in poor efficiency and damage during battery use.
In this study, a novel application of synchrotron X-ray nanotomography based on high-resolution full-field transmission X-ray microscopy for characterizing the structure and morphology of micrometric hollow polymeric fibers is presented. By employing postimage analysis using an open-source software such as Tomviz and ImageJ, various key parameters in fiber morphology, including diameter, wall thickness, wall thickness distribution, pore size, porosity, and surface roughness, were assessed. Electrospun polycaprolactone fibers with micrometric diameters and submicrometric features with induced porosity via gas dissolution foaming were used to this aim.
View Article and Find Full Text PDFObjectives: The aim of this study is to evaluate some mechanisms of the immune response of people infected with SARS-CoV-2 in both acute infection and early and late convalescence phases.
Methods: This is a cohort study of 70 cases of COVID-19, confirmed by RT-PCR, followed up to 60 days. Plasma Samples and clinical data were.
The combination of near edge X-ray absorption spectroscopy with nanoscale X-ray imaging is a powerful analytical tool for many applications in energy technologies, catalysis, which are critical to combat climate change, as well as microelectronics and life science. Materials from these scientific areas often contain key elements, such as Si, P, S, Y, Zr, Nb, and Mo as well as lanthanides, whose X-ray absorption edges lie in the so-called tender photon energy range 1.5-5.
View Article and Find Full Text PDFHolography is a powerful method for achieving 3D images of objects. Extending this method to short wavelengths potentially offers significantly higher resolution than visible light holography. However, current X-ray holography setups employ nanoscale pinholes to form the reference wave.
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