Space and mirror charge effects in time-resolved photoemission spectroscopy can be modeled to obtain relevant information on the recombination dynamics of carriers. We successfully extracted from these phenomena reneutralization characteristic time positive charges generated by photoexcitation CeO2-based films. For above-band-gap excitation, a large fraction carriers with lifetime that exceeds ...

Conventional supported metal catalysts are metal nanoparticles deposited on high surface area oxide supports with a poorly defined metal-support interface. Typically, the traditionally prepared Pt/ceria catalyzes both methanation (H2/CO to CH4) and water-gas shift (CO/H2O to CO2/H2) reactions. By using simple nanochemistry techniques, we show for the first time that Pt or PtAu metal can be crea...

Nanoparticles (Nps) can induce toxicity in the lung by accidental or intentional exposure. The main objective of the study reported here was to characterize the effect that four metal oxide Nps (CeO2, TiO2, Al2O3 and ZnO) had at the cellular level on a human lung epithelial cell line. This goal was achieved by studying the capacity of the Nps to activate the main mitogen-activated protein kinas...

The design and fabrication of core-shell nanostructures with steerable morphologies and tailored performances have aroused abundant scientific studies for organic transformations. We here report the preparation of multifunctional and highly efficient core-shell microspheres, which bear a carbon-protected magnetic Fe3O4 core, a transition layer of active Pd nanoparticles (NPs) and an outer shell...

SiO2@PDMS and CeO2-ZrO2-SiO2@PDMS nanocomposites were prepared and studied using nitrogen adsorption-desorption, Fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), measurements of advancing and receding contact angles with water, and microcalorimetry. The pore size distributions indicate that the textural characteristics change after oxide modification by poly(...

Upon reduction at 975 °C, a strong metal-support interaction (SMSI) of CeO2 on Pt NPs leads to low rates for ethylene hydrogenation and propane dehydrogenation, but high olefin selectivity the latter reaction. By contrast, 550 °C Pt/CeO2, 5 nm NP’s with dehydrogenation TORs similar Pt/SiO2. X-ray absorption fine structure (EXAFS) scanning transmission electron microscopy (STEM) shows formation ...

The effect of support on the performance Pd1Ag10/Al2O3 and Pd1Ag10/CeO2–ZrO2 catalysts in selective hydrogenation diphenylacetylene (DPA) was studied. Characterization catalyst by DRIFTS-CO HRTEM revealed formation a PdAg single-atom alloy (SAA) structure surface nanoparticles, with Pd1 sites isolated Ag atoms. It found that use CeO2–ZrO2 as carrier makes it possible to increase activity Pd1Ag1...

nanostructured ceo2 powders were synthesized via a series of hydrothermal and solution precipitation methods. three different hydrothermal methods including 1:2 and 1:1 bi:ce molar ratios at 180 °c for 48 h (s1 and s2, respectively) without calcinations and 2:1 bi:ce molar ratio at 180 °c for 48 h with calcinations (s3) were performed successfully for the synthesis of the target nanomaterials. ...

Exposure to nanoparticles by various routes results in size-dependent translocation of the systemic circulation and subsequent accumulation liver. The purpose this study was determine possible adverse effects liver long-lasting nanoparticle presence organ. Mice exposed a single dose (162 µg/animal equivalent 9 mg/kg body weight) TiO2, CeO2 or carbon black intratracheal instillation intravenous ...