A5014414224- X-ray Diffraction in Crystallography
- Crystallization and Solubility Studies
- Crystallography and molecular interactions
- Catalytic Processes in Materials Science
- Gas Sensing Nanomaterials and Sensors
- Cryospheric studies and observations
- Advanced Chemical Physics Studies
- Luminescence Properties of Advanced Materials
- Landslides and related hazards
- Advanced Photocatalysis Techniques
- Molecular spectroscopy and chirality
- Catalysts for Methane Reforming
- Occupational Health and Safety in Workplaces
- Metal-Organic Frameworks: Synthesis and Applications
- Industrial Gas Emission Control
- Analytical Chemistry and Sensors
- Catalysis and Hydrodesulfurization Studies
- Molecular Junctions and Nanostructures
- Electronic and Structural Properties of Oxides
- Electrochemical Analysis and Applications
- Catalysis and Oxidation Reactions
- Oxidative Organic Chemistry Reactions
- Geology and Paleoclimatology Research
- Bioactive Compounds and Antitumor Agents
- Catalysis for Biomass Conversion
The University of Texas at El Paso
1994-2024
Universidad Rey Juan Carlos
2024
Universidad de Zaragoza
2002-2023
Instituto de Nanociencia y Materiales de Aragón
2020-2023
Centro Médico Sanitas Zaragoza
2020-2021
Universidad de la República de Uruguay
2010-2015
Universidade de Santiago de Compostela
2007
Central University of Venezuela
1993-2003
Brookhaven National Laboratory
2000-2001
Universidad de Sevilla
2000-2001
We have deposited in ultrahigh vacuum Co on top of clean, well-ordered Cu surfaces. The deposition is followed by Auger spectroscopy and low-energy-electron diffraction. At room temperatures, does not diffuse into the substrate: grows two-dimensional islands to form first layer from then growth layer. system Co-Cu(100) shows a $c(2\ifmmode\times\else\texttimes\fi{}2)$ reconstruction when surface clean $p(2\ifmmode\times\else\texttimes\fi{}2)$ certain impurities are present at interface....
Iodoalkynes [1,4-bis(iodoethynyl)benzene (p-BIB) and 1,3-bis(iodoethynyl)benzene (m-BIB)] have been used successfully to prepare halogen bonding complexes with a range of 4-pyridine derivatives showing liquid crystalline organizations. The trimeric halogen-bonded obtained from p-BIB rod-like structure exhibited high order calamitic phases (SmB G). In contrast, m-BIB gives rise bent-shaped structures that display SmAP-like mesophases. Furthermore it was found the presence three five aromatic...
Accelerated ice loss from Thwaites Glacier poses a potential threat to the stability of West Antarctic Ice Sheet, making it key contributor future sea-level rise and priority in research. Seismic investigations have proven invaluable glaciological research, enabling examination basal conditions, ice-bedrock interactions, seismotectonic processes that could contribute glacier retreat sheet instability. From December 2019 2021, as part Interdisciplinary Margin Evolution (TIME) project, we...
The Thwaites Interdisciplinary Margin Evolution (TIME) project, part of the International Glacier Collaboration (ITGC), examines physical processes and properties at Eastern Shear in West Antarctica using geophysical imaging monitoring. During 2023-24, TIME field team collected controlled-source seismic reflection refraction data across Thwaites’ Margin, with 1000 3-component nodes deployed a 27-km line 3-km by 5.5-km grid. We detonated 671 sources, mostly...
In environmental catalysis the removal or destruction of S-containing molecules is a very important issue nowadays. The interaction H2S and SO2 with Cr2O3(0001), MgO(100) CrxMg1-xO(100) surfaces (x = 0.05−0.08) was studied using synchrotron-based high-resolution photoemission. X-ray absorption near-edge spectroscopy (XANES) used to examine chemistry on powders Cr2O3, MgO CrxMg1-xO catalysts. activity toward breaking S−H S−O bonds found increase in sequence: < Cr2O3 CrxMg1-xO. mixed-metal...
Perovskites of the PbZr1−xTixO3 type are among most important ferroelectric materials and highly active catalysts. The structural electronic properties PbTiO3, PbZrO3, PbZr0.5Ti0.5O3 were examined using first-principles density-functional (DF) calculations with local-density-approximation (LDA) or generalized-gradient approximation (GGA, Perdew–Wang Perdew–Burke–Ernzerhoff functionals). A series crystal structures considered for each compound. In several cases, parameters predicted by GGA...
Synchrotron-based high-resolution photoemission, x-ray absorption near-edge spectroscopy, and first-principles density-functional calculations are used to examine the interaction of SO2 with pure modified surfaces magnesium oxide. On a MgO(100) single crystal, reacts O centers form SO3 SO4 species. The bonding interactions Mg cations weak do not lead cleavage S–O bonds. An identical result is found after adsorbing on stoichiometric powders MgO other oxides (TiO2, Cr2O3, Fe2O3, NiO, CuO, ZnO,...
Ultraviolet photoelectron spectroscopy (UPS), thermal desorption mass (TDS), and first-principles density functional (DF) generalized-gradient-corrected calculations were used to study the adsorption of CO NO on MgO(100), Ni0.06Mg0.94O(100), Cr0.07Mg0.93O(100) surfaces. UPS spectra DF show clear differences in electronic properties these oxides. After doping MgO with nickel, states Ni 3d character appear ∼1.5 eV above occupied {O 2p+Mg 3s} band. A similar phenomenon is found after adding Cr,...
The interaction of NO with SrTiO3(100) surfaces was investigated using thermal desorption, photoemission, and first-principles density-functional calculations. crystals used in the experiments exposed mainly (&gt;80%) TiO2-terminated face SrTiO3(100). On stoichiometric surfaces, adsorption completely reversible at submonolayer coverages. Clear peaks for desorption were found 125 (multilayer state), 160, 260 K, plus a long tail between 300 450 K. Desorption N2O detected only near K...
The rational design of catalysts with a high efficiency for the destruction NOx compounds (DeNOx process) is major problem in environmental chemistry. adsorption NO, NO2, and N2O on MgO(100), Zn0.06Mg0.94O(100), Cr0.06Mg0.94O(100), Cr2O3(0001) was studied using high-resolution photoemission first-principles density-functional calculations. Important differences were found chemistry adsorbed species, but general our results show clear correlation between electronic properties reactivity oxide...
The interaction of CH3SH with TiO2(110) has been studied a combination synchrotron-based high-resolution photoemission, thermal desorption mass spectroscopy, and first-principles density functional slab calculations. On the Ti O sites perfect substrate there is no dissociation CH3SH. molecule bonds to via its S lone pairs desorbs at temperatures below 300 K. For chemisorbed on terraces TiO2(110), energies for molecular adsorption are ∼10−13 kcal/mol. energy defects ∼18 Photoemission results...
To obtain further knowledge on the morphogenesis of articulations in tympanic ossicular chain humans.In 25 temporal bones human fetuses structural development incudomallear, incudostapedial and stapediovestibular was studied. The chronological ages were between 7th week (21 mm) 29th (270 mm).Incudomallear articulation showed diarthrosis sellar joint characteristics. It a homogenous interzone development, three-layered 8th week, first cavitation signs 9th presence an articular cavity 10th...
The electronic distribution of some haloethynylbenzene derivatives may favor the formation two-dimensional organizations by combining halogen and hydrogen bonds. In order to highlight this strategy, we have prepared seven cocrystals analyzed their structures. 1,4-Bis(iodoethynyl)benzene, 1,4-bis(bromoethynyl)benzene, 1,3-bis(iodoethynyl)benzene were used as bond donors 1,2-bis(4-pyridyl)ethylene, pyridazine, propanone, hexamethylenetetramine,...
The formation and reductive desorption of self-assembled monolayers 6-mercaptohexanol on mercury has been studied by using cathodic stripping voltammetry capacitative transients, including the possibility expanding or contracting electrode area at end preconcentration step. Experimental evidence shows existence three sequential stages during a thiol monolayer. Each these can be associated to presence (i) low surface density state oxidized molecules, characterized single electrodimerization...
Diiodo Tröger's base derivatives proved to be self-complementary tectons that are particularly suitable for the formation of porous supramolecular structures by halogen bonding.
We present two hydantoin isomers that self-assemble through hydrogen bonding in solution and bulk, either a bowl-shaped or planar rosette, resulting remarkable liquid crystals gelation properties.