Papers by Sonia Carabineiro
Functionalized Nanomaterials for Catalytic Application, 2021
Chemical Communications, 2020
The incorporation of single atomic Na into carbon nitride can boost the visible photocatalytic ac... more The incorporation of single atomic Na into carbon nitride can boost the visible photocatalytic activity towards NO oxidation.
Materials Science and Engineering: C, 2020
The use of piezoelectric materials in tissue engineering has grown considerably since inherent bo... more The use of piezoelectric materials in tissue engineering has grown considerably since inherent bone piezoelectricity was discovered. Combinations of piezoelectric polymers with magnetostrictive nanoparticles (MNP) can be used to magnetoelectrically stimulate cells by applying an external magnetic field which deforms the magnetostrictive nanoparticles in the polymer matrix, deforming the polymer itself, which varies the surface charge due to the piezoelectric effect. Poly(vinylidene) fluoride (PVDF) is the piezoelectric polymer with the largest piezoelectric coefficients, being a perfect candidate for osteogenic differentiation. As a first approach, in this paper, we propose PVDF membranes containing magnetostrictive nanoparticles and a biomimetic heparin/ collagen layer-by-layer (LbL) coating for mesenchymal stem cell culture. PVDF membranes 20% (w/v) with and without cobalt ferrite oxide (PVDF-CFO) 10% (w/w) were produced by non-solvent induced phase separation (NIPS). These membranes were found to be asymmetric, with a smooth surface, crystallinity ranging from 65% to 61%, and an electroactive β-phase content of 51.8% and 55.6% for PVDF and PVDF-CFO, respectively. Amine groups were grafted onto the membrane surface by an alkali treatment, confirmed by ninhydrin test and X-ray photoelectron spectroscopy (XPS), providing positive charges for the assembly of heparin/collagen layers by the LbL technique. Five layers of each polyelectrolyte were deposited, ending with collagen. Human mesenchymal stem cells (hMSC) were used to test cell response in a short-term culture (1, 3 and 7 days). Nucleus cell counting showed that LbL favored cell proliferation in PVDF-CFO over non-coated membranes.
Catalysis Communications, 2020
Nickel particles deposited on hydrothermally synthesized ceria nanorods (CeO 2 -NR) were found to... more Nickel particles deposited on hydrothermally synthesized ceria nanorods (CeO 2 -NR) were found to be highly active and stable for CO 2 methanation. A CO 2 -to-CH 4 yield of 92% was achieved at 300 °C. The impact of various operational parameters was explored in conjunction with a thermodynamic analysis. The superior performance of Ni/CeO 2 -NR was demonstrated through a comparison with i) CeO 2 and Ni/CeO 2 commercial products, ii) various M/CeO 2 -NR lab-synthesized catalysts (M = Cu, Co, Fe), and iii) state-of-the-art literature catalysts. The results revealed that a unique combination of Ni with ceria nanorods is required for boosting the reducibility and in turn the methanation efficiency.
Ceramics International, 2020
This is a PDF file of an article that has undergone enhancements after acceptance, such as the ad... more This is a PDF file of an article that has undergone enhancements after acceptance, such as the addition of a cover page and metadata, and formatting for readability, but it is not yet the definitive version of record. This version will undergo additional copyediting, typesetting and review before it is published in its final form, but we are providing this version to give early visibility of the article. Please note that, during the production process, errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.
ChemCatChem, 2018
The C‐scorpionate iron(II) complex [FeCl2(Tpm)] [Tpm=κ3‐HC(C3H3N2)3] (1) was immobilized on five ... more The C‐scorpionate iron(II) complex [FeCl2(Tpm)] [Tpm=κ3‐HC(C3H3N2)3] (1) was immobilized on five different nanostructured carbon materials (nanodiamonds, graphene nanoplatelets, graphene oxide, reduced graphene oxide, and nanohorns) to produce active, selective, and recyclable catalysts for alkane and alcohol oxidations. The heterogenized systems (including the first ever reported complexes supported on carbon nanohorns) exhibited good activity concomitant with rather high selectivity to the formation of ketone alcohol (KA) oil (cyclohexanol and cyclohexanone mixture, yields up to 29 %) from microwave‐assisted oxidation of cyclohexane, and allowed their easy recovery and reuse, at least for five consecutive cycles maintaining 90.3 % of the initial activity. Moreover, the functionalized nanodiamond supports (used for the first time as supports for iron complexes) were also able to effectively (yields up to 97 %) catalyze the microwave‐induced oxidation of 1‐ and 2‐phenylethanol to acetophenone and 2‐phenylacetaldehyde, respectively, and could be reused for seven consecutive cycles without losing catalytic activity.
Inorganica Chimica Acta, 2017
The effect of the support was explored for Cu-based catalysts on the oxidation of ethyl acetate (... more The effect of the support was explored for Cu-based catalysts on the oxidation of ethyl acetate (EtΟAc), a common volatile organic compound. In particular, four Rare Earth Oxide(s) (REO), namely CeO 2 , Gd 2 O 3 , La 2 O 3 and Sm 2 O 3 , were used as supports to obtain the Cu/REO catalysts. The samples were characterized by N 2 adsorption at -196 °C (to determine the surface area), scanning electron microscopy, X-ray diffraction and temperature programmed reduction to gain insight into the impact of textural, structural and redox properties on the catalytic efficiency. The following sequence, in terms of EtΟAc conversion, was revealed: Cu/CeO 2 > Cu/Gd 2 O 3 > Cu/Sm 2 O 3 > Cu/La 2 O 3 , which is closely related to the redox properties of the Cu/REO samples, in terms of reducibility and labile oxygen availability. Complete EtOAc conversion was achieved at temperatures as low as 275 °C over Cu/CeO 2 , which was the most efficient catalyst.
Chemistry – An Asian Journal, 2017
Journal of CO2 Utilization, 2017
The present work aims to explore the impact of the support (M x O y : Al 2 O 3 , TiO 2 , Fe 2 O 3... more The present work aims to explore the impact of the support (M x O y : Al 2 O 3 , TiO 2 , Fe 2 O 3 , CeO 2 , ZnO) on the CO 2 hydrogenation activity of supported gold nanoparticles (Au/M x O y ) at atmospheric pressure. The textural, redox and surface properties of Au/M x O y catalysts were evaluated by various characterisation methods, namely N 2 adsorption-desorption at -196 °C, temperature-programmed reduction in H 2 , high resolution transmission electron microscopy and X-ray photoelectron spectroscopy. The results revealed a strong influence of the support both on CO 2 conversion and on products distribution. Gold nanoparticles supported on ZnO and CeO 2 were highly selective towards methanol. TiO 2 -and Fe 2 O 3 -based samples demonstrated high CO 2 conversion, leading, however, almost exclusively to CO and/or CH 4 . Au/Al 2 O 3 was practically inactive in the investigated temperature range (200-350 °C). The following activity order, in terms of methanol formation rate, was
Molecules (Basel, Switzerland), Jan 8, 2016
The subject of catalysis by coinage metals (copper, silver, and gold) comes up increasingly day-b... more The subject of catalysis by coinage metals (copper, silver, and gold) comes up increasingly day-by-day. This Special Issue aims to cover the numerous aspects of the use of these metals as catalysts for several reactions. It deals with synthesis and characterization of copper, silver and gold based catalysis, their characterization and use, both for heterogeneous and homogeneous catalysis, and some of their potential applications.
Chemistry, an Asian journal, Jan 6, 2017
C-scorpionate vanadium(IV) [VOxCl3-x{κ3-RC(pz)3}] [pz = pyrazol-1-yl; x = 0, R = SO3 (1); x = 1, ... more C-scorpionate vanadium(IV) [VOxCl3-x{κ3-RC(pz)3}] [pz = pyrazol-1-yl; x = 0, R = SO3 (1); x = 1, R = CH2OH (2) or CH2OSO2Me (3)] complexes supported on functionalized carbon nanotubes (CNT) are the first V-scorpionate catalysts used so far for the neat oxidation of o-, m- or p-xylene, with TBHP (70% aqueous solution), to the corresponding toluic acids (main products), tolualdehydes and methylbenzyl alcohols. Remarkably, a p-toluic acid yield of 43% (73% selectivity, TON = 1.34 × 103) was obtained with 2@CNT in a simple microwave-assisted mild oxidation procedure, using a very low catalyst charge (3.2 × 10-2 mol% vs. substrate). Further, this occurred in the absence of any bromine source, what is significant towards the development of a greener and more sustainable process for xylenes oxidation. Moreover, catalysts reuse with preservation of their activity was found for up to six consecutive cycles. The effects of reaction parameters, such as reaction time, temperature, amount of cat...
Journal of Catalysis, 2017
A readily accessible route to obtain solid-supported nitrogen acyclic carbene (SNAC) complexes of... more A readily accessible route to obtain solid-supported nitrogen acyclic carbene (SNAC) complexes of gold was designed using flow chemistry, and an analogous homogeneous gold complex was synthesized for comparison. Both were screened for counter ions in order to perform the Hashmi phenol synthesis. A recyclability study was performed on the SNAC complex, which showed the high stability of this catalyst, with no observed leaching or gold nanoparticle formation. XPS analysis was employed to confirm the presence of gold and its oxidation state.
RSC Advances, 2015
Microcystin MC-LA degradation by a nanostructured solar photocatalyst.
Progress in Organic Coatings, 2015
Fig. 6. XPS results of non-modified PVDF fibers and oxygen plasma treated fibers for 120 s with a... more Fig. 6. XPS results of non-modified PVDF fibers and oxygen plasma treated fibers for 120 s with an O2 flow rate of 120 mL min -1 : (a) XPS scans, (b) C1s scan spectra, (c) F1s spectra and (d) O1s spectra.
ZnO materials with different micro/nanoscale morphologies (needle-like, rods, flower-like and sph... more ZnO materials with different micro/nanoscale morphologies (needle-like, rods, flower-like and spheroidal) were prepared by different techniques. Gold was loaded (1% wt.) on the ZnO supports through a double impregnation method. The morphology of the ZnO and Au/ZnO materials was analyzed by scanning electron microscopy (SEM) and energydispersive X-ray spectroscopy (EDS). Scanning transmission electron microscopy (STEM) and a high-angle annular darkfield (HAADF) detector were used to detect the gold nanoparticles. High-resolution transmission electron microscopy (HRTEM) of Au/ZnO was also performed. As gold is only catalytically active in the form of nanoparticles well dispersed on the support, it is very important to use electron microscopy methods that enable the determination of size, morphology, crystallinity and chemistry of nanoscale gold.
Science and Applications, 2009
Studies in Surface Science and Catalysis, 2010
CeO2, TiO2 and Ce-Ti-O supports with different Ce/Ti molar ratios were synthesized by solvothermo... more CeO2, TiO2 and Ce-Ti-O supports with different Ce/Ti molar ratios were synthesized by solvothermolysis. When titania was combined with ceria, a nanostructured architecture was produced, evidencing the strong influence of Ti on the support structure, so that the Ce-Ti-O supports obtained were mainly amorphous, with some crystalline nuclei. Addition of Ce to titania strongly increases the surface area and oxygen content of samples. Au was loaded on the supports by a double impregnation method. The obtained Au/CeO2, Au/TiO2 and Au/Ce-Ti-O materials were also tested for CO oxidation. The differences between samples can be explained by the Au nanoparticle size, which has been proved to be a crucial factor in the preparation of Au catalysts.
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Papers by Sonia Carabineiro