A5022363471- Catalytic Processes in Materials Science
- Catalysis and Oxidation Reactions
- Mesoporous Materials and Catalysis
- Catalysis and Hydrodesulfurization Studies
- Catalysts for Methane Reforming
- Advanced X-ray Imaging Techniques
- Advanced Electron Microscopy Techniques and Applications
- Aerogels and thermal insulation
- X-ray Spectroscopy and Fluorescence Analysis
- Zeolite Catalysis and Synthesis
- Trace Elements in Health
- Pigment Synthesis and Properties
- Prion Diseases and Protein Misfolding
- Food Drying and Modeling
- Advanced ceramic materials synthesis
- Magnesium Oxide Properties and Applications
- Ion-surface interactions and analysis
- Enzyme Structure and Function
- Polyoxometalates: Synthesis and Applications
- RNA Research and Splicing
- Machine Learning in Materials Science
- Characterization and Applications of Magnetic Nanoparticles
- Advanced Materials Characterization Techniques
- X-ray Diffraction in Crystallography
- Nanoparticle-Based Drug Delivery
Brazilian Center for Research in Energy and Materials
2018-2024
Brazilian Synchrotron Light Laboratory
2018-2024
Universidade Estadual Paulista (Unesp)
2011-2021
Synchrotron soleil
2013-2020
Pontifícia Universidade Católica de Campinas
2019
Centro Universitário de Araraquara
2016
Universidade Federal de Lavras
2010
Abstract Structural and surface features of highly dispersed copper catalysts supported on hierarchical porous alumina were evaluated for the ethanol dehydrogenation reaction. The prepared by incipient wetness impregnation obtained a dual template sol–gel procedure. characterizations provided evidence that was in form monomeric octahedral Cu 2+ species adsorbed into an incomplete layer. A two‐step reduction observed temperature range 50–250 °C under H 2 /He flow. onset percentage + formed...
Prion diseases are characterized by prion protein (PrP) transmissible aggregation and neurodegeneration, which has been linked to oxidative stress. The physiological function of PrP seems related sequestering redox-active Cu 2+ , dyshomeostasis is observed in disease brain. It unclear whether contributes aggregation, recently shown be mediated condensation. This study indicates that promotes condensation live cells at the cell surface vitro through copartitioning. Molecularly, inhibited...
Abstract Understanding catalysts strain dynamic behaviours is crucial for the development of cost-effective, efficient, stable and long-lasting catalysts. Here, we reveal in situ three-dimensional evolution single gold nanocrystals during a catalytic CO oxidation reaction under operando conditions with coherent X-ray diffractive imaging. We report direct observation anisotropic dynamics at nanoscale, where identically crystallographically-oriented facets are qualitatively differently...
Mechanism of gelation process and phase separation for production hierarchical porous alumina with high surface area.
In biological systems, nanoparticles interact with biomolecules, which may undergo protein corona formation that can result in noncontrolled aggregation. Therefore, comprehending the behavior and evolution of presence fluids is paramount nanomedicine. However, traditional lab-based colloid methods characterize diluted suspensions low-complexity media, hinders in-depth studies complex environments. Here, we apply X-ray photon correlation spectroscopy (XPCS) to investigate silica (SiO
In this work, the oxidation of methylene blue textile dye in presence hydrogen peroxide, using niobium oxide impregnated with different proportions tin (1, 5 and 10% mass) as catalyst was studied. The materials were characterized by TPR, XPS, XRD FTIR. tests monitored ESI-MS showed that composite containing higher amount most efficient removal dye. XRD, TPR data presented evidence formation tin-niobium Sn0 supported SnO2.
Abstract The effect of sol–gel alumina characteristics on the supported Co catalyst properties was investigated at different steps preparation. Porous with variable surface reactivity were prepared from transition and spinodal decomposition induced by polymers. hydrophobicity polymer or calcination temperature controls amount hydroxyl groups. dried catalysts are composed cobalt hydrotalcite‐like compounds up to 64 %. After calcination, higher proportions CoAl 2 O 4 observed in presenting a...
The catalyst regeneration leads to the redispersion of smaller cobalt particles leading a similar conversion along successive reaction–regeneration cycles.
Abstract Prion diseases are characterized by prion protein (PrP) transmissible aggregation and toxicity in the brain. The physiological function of PrP seems related to sequestering internalization redox-active Cu 2+ . It is unclear whether contributes aggregation, recently shown be mediated condensation. We investigated role oxidation condensation using multiple biophysical biochemical methods. find that promotes at cell surface vitro through co-partitioning. Molecularly, inhibited...
MCR-ALS analysis of Quick-EXAFS combined to Raman provide insight into activation/reactivity and deactivation NiCu-catalysts used for Ethanol Steam Reforming.
Insights into the nickel sulphide speciation of a dried oxidic Ni catalyst supported on delta-alumina were obtained by temperature-programmed sulphidation monitored Quick-X-ray absorption with online mass spectrometry. Combination Raman spectroscopy enabled phase identification phases isolated multivariate curve regression alternating least square analysis time-resolved X-ray data.
The chemical properties of materials are dependent on dynamic changes in their three-dimensional (3D) structure as well the reactive environment. We report an
Cateretê, the coherent X-ray scattering beamline at new Brazilian synchrotron 5bent-achromat source, Sirius [1] is dedicated to diffraction imaging (CDI) as well photon correlation spectroscopy (XPCS) studies.Making most of coherence properties ultra-low emittance accelerator, will enable perform 3D micrometer sized specimen down few nanometers spatial resolution.
GELS AND POROUS SOLIDS.The present work deals with the design and construction of an equipment for studying drying process gels solids.The was built using mainly a commercial oven others peripherals programmed control temperature, humidity data acquisition.The system allows in situ monitoring gel drying, registering weight loss, shrinkage sample temperatures.This set allowed parameters makes possible to establish main steps involved meso nanostructured porous materials.
Abstract Multimodal measurements involving time‐resolved Ni and Cu K edges Quick‐EXAFS, hyperspectral Full Field Quick‐EXAFS imaging with micrometer spatial resolution aberration‐corrected Environmental Scanning Transmission Electron Microscopy have been performed over a NiCu catalyst used for the ethanol steam reforming reaction to establish structure‐activity relationships after regeneration. Activated catalysts are composed of 5–10 nm monometallic nickel nanoparticles larger bimetallic...