A5050882737- X-ray Diffraction in Crystallography
- Crystallization and Solubility Studies
- Advanced NMR Techniques and Applications
- Zeolite Catalysis and Synthesis
- Metal-Organic Frameworks: Synthesis and Applications
- Chemical Synthesis and Characterization
- Crystallography and molecular interactions
- NMR spectroscopy and applications
- Carbon Dioxide Capture Technologies
- Covalent Organic Framework Applications
- Solid-state spectroscopy and crystallography
- Mesoporous Materials and Catalysis
- Membrane Separation and Gas Transport
- Magnetism in coordination complexes
- Lanthanide and Transition Metal Complexes
- Polyoxometalates: Synthesis and Applications
- Catalysis for Biomass Conversion
- Catalysis and Hydrodesulfurization Studies
- Crystal Structures and Properties
- Layered Double Hydroxides Synthesis and Applications
- Biofuel production and bioconversion
- Gas Sensing Nanomaterials and Sensors
- Lipid Membrane Structure and Behavior
- Advanced Nanomaterials in Catalysis
- Magnesium Oxide Properties and Applications
University of Aveiro
2016-2025
Materia (United States)
2025
Laboratório Associado CICECO – Instituto de Materiais de Aveiro
2025
Universidade Federal de Campina Grande
2024
University of Coimbra
2023
Helmholtz-Institute Ulm
2019
Complejo Hospitalario Universitario de Santiago
2019
University of Oxford
2012
Universidad de Oviedo
1996-2012
Max Planck Institute for Polymer Research
2011
The interaction of gaseous CO2 with the surface amine-modified nanoporous clays has been studied. adsorption and microcalorimetry revealed high capacity strong at low pressures, due to presence amine groups. Considerable heterogeneity initial heat (125 kJ mol−1) have observed, although was reversible hysteresis pressures very slow desorption kinetics. Interaction between 13CO2 clay materials investigated by 13C 15N magic-angle spinning (MAS) NMR. NMR resonances ca. 164 160 ppm assigned to,...
Isostructural modular microporous Na2[Y(hedp)(H2O)0.67] and Na4[Ln2(hedp)2(H2O)2].nH2O (Ln = La, Ce, Nd, Eu, Gd, Tb, Er) framework-type, layered orthorhombic [Eu(H2hedp)(H2O)2].H2O Na0.9[Nd0.9Ge0.10(Hhedp)(H2O)2], monoclinic [Ln(H2hedp)(H2O)].3H2O Y, Tb), triclinic [Yb(H2hedp)].H2O coordination polymers based on etidronic acid (H5hedp) have been prepared by hydrothermal synthesis characterized structurally (among others) single-crystal powder X-ray diffraction solid-state NMR. The structure...
Heptazine-based polymeric carbon nitrides (PCN) are promising photocatalysts for light-driven redox transformations. However, their activity is hampered by low surface area resulting in concentration of accessible active sites. Herein, we report a bottom-up preparation PCN nanoparticles with narrow size distribution (ca. 10±3 nm), which fully soluble water showing no gelation or precipitation over several months. They allow photocatalysis to be carried out under quasi-homogeneous conditions....
We present an experimental NMR, X-ray diffraction (XRD), and computational study of the supramolecular assemblies two crystalline forms Ciprofloxacin: one anhydrate hydrate forming water wormholes. The resonance assignment up to 51 54 distinct (13)C (1)H resonances for is reported. effect crystal packing, identified by XRD, on chemical shifts including weak interionic H-bonds, quantified; shift changes ∼-3.5 ppm CH···π contacts ∼+2 (CH···O((-))); ∼+4.7 (((+))NH···O((-))) H-bonds. Water...
Two-dimensional (2D) solid-state nuclear magnetic resonance (SSNMR) experiments on samples loaded with 13C-labeled CO2, “under controlled partial pressures”, have been performed in this work, revealing unprecedented structural details about the formation of CO2 adducts from its reaction various amine-functionalized SBA-15 containing amines having distinct steric hindrances (e.g., primary, secondary) and similar loadings. Three chemisorbed species were identified by NMR carbonyl environments...
Nanocomposites of SO<sub>3</sub>H-functionalized carbon/non-porous silica solid acid catalysts for the synthesis useful bio-products.
Reaching a historic high of 36.3 gigatonnes in 2021, global CO2 emissions from fossil fuel combustion continue to increase at an alarming rate. removal technologies are part the solution tackle this crucial environmental challenge. Thus, development porous materials for storage and capture gas molecules (in particular, carbon storage) has attracted great interest both academic industrial communities due its potential mitigating atmospheric concentrations. Atomic-scale studies essential...
Abstract The acid‐catalyzed reaction of 5‐(hydroxymethyl)‐2‐furfural with ethanol is a promising route to produce biofuels or fuel additives within the carbohydrate platform; specifically, this may give 5‐ethoxymethylfurfural, 5‐(ethoxymethyl)furfural diethylacetal, and/or ethyl levulinate (bioEs). It shown that sulfonated, partially reduced graphene oxide (S‐RGO) exhibits more superior catalytic performance for production bioEs than several other acid catalysts, which include sulfonated...
Hydrothermal reactions between rare-earth (RE) chloride salts and N-(carboxymethyl)iminodi(methylphosphonic acid) (H5cmp) led to the isolation of a series layered networks formulated as [RE(H2cmp)(H2O)] [RE3+ = Y3+, La3+, Pr3+, Nd3+, Sm3+, Eu3+, Gd3+, Tb3+, Dy3+, Ho3+ Er3+]. All compounds were isolated micro-crystalline powders (many which nano-sized in thickness), with plate-like crystallites found exhibit preferential growth perpendicular [002] vector, feature seems favour catalytic...
Attractive intermolecular interactions of building blocks with strong dipole moments result in a COF high crystallinity and large surface area.
This study delves into the potential advantage of utilizing crab shells as sustainable solid adsorbents for CO
Abstract Hydrotalcite‐like Mg‐Al‐NO 3 ‐layered double hydroxide (LDH) was successfully prepared in a mortar by manually grinding the hydrated magnesium and aluminum nitrate salts with sodium hydroxide. Various techniques, including XRD, MAS NMR, FTIR, SEM; thermogravimetric differential thermal analyses (TGA,DTA), surface area zeta potential measurements were used to establish correlation between LDH samples co‐precipitation. The showed all characteristics of layered structure but lower...
Mesoporous carbon/silica composites with high acid site contents of different strengths are versatile catalysts for converting biomass-derived intermediates to bio-products.
Two series of isoreticular chiral metal–organic frameworks assembled from Ln(III) (Ln = Sm, Eu, Gd, Tb, Dy, Ho, Er, Yb), Na(I), and flexible-achiral rigid dicarboxylate ligands, formulated as [NaLn(Tart)(BDC)(H2O)2] (S1) [NaLn(Tart)(biBDC)(H2O)2] (S2) (H2Tart tartaric acid; H2BDC terephthalic H2biBDC biphenyl-4,4′-dicarboxylic acid), were obtained single phases under hydrothermal conditions. The compounds have been studied by single-crystal powder X-ray diffraction, thermal analyses (TG-MS...
Here, we report that the dispersion and environment of acid sites anchored on a periodic mesoporous organosilica play crucial role in its catalytic activity water.
Covalently supported ionic liquids in mesoporous materials were prepared by grafting 1-methyl-3-(3-trimethoxysylilpropyl)imidazolium chloride MCM-41.
Two new cocrystals of theophylline were prepared by liquid assisted grinding. While compound 1 (theophylline:4-aminosalicylic acid 2:1) was characterized single crystal X-ray diffraction, the structure 2 (theophylline:4-aminobenzoic 1:1) determined combining powder diffraction (XRPD), solid-state NMR and DFT calculations. The use 1D/2D 1H high-resolution techniques provided structural insight on local length scales revealing internuclear proximities relative orientations between building...
Chemisorbent materials, based on porous aminosilicas, are among the most promising adsorbents for direct air capture applications, one of key technologies to mitigate carbon emissions. Herein, a critical survey all reported chemisorbed CO2 species, which may form in aminosilica surfaces, is performed by revisiting and providing new experimental proofs assignment distinct species thus far literature, highlighting controversial assignments regarding existence still under debate. Models...
The difference in the crystal structure and growth kinetics of microtubes formed from l- d-enantiomers diphenylalanine dipeptide is investigated both experimentally theoretically by computer simulation. grown simultaneously under identical experimental conditions possess different crystallographic space groups, have essential sizes, demonstrate kinetics. Computer simulation molecular mechanics methods revealed a fundamental interaction between structural units chiralities. A model describing...