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322 results on '"Sanchez-Cortes S."'

2. Influence of the growth conditions on the magnetism of SrFe$_{12}$O$_{19}$ thin films and the behavior of Co / SrFe$_{12}$O$_{19}$ bilayers

Author

Soria, G. D., Marco, J. F., Mandziak, A., Sánchez-Cortés, S., Sánchez-Arenillas, M., Prieto, J. E., Dávalos, J., Foerster, M., Aballe, L., López-Sánchez, J., Guzmán-Mínguez, J. C., Granados-Miralles, C., de la Figuera, J., and Quesada, A.

Subjects
Condensed Matter - Materials Science, Physics - Applied Physics
Abstract

SrFe$_{12}$O$_{19}$ (SFO) films grown on Si (100) substrates by radio-frequency magnetron sputtering have been characterized in terms of composition, structural and magnetic properties by a combination of microscopy, diffraction and spectroscopy techniques. M\"ossbauer spectroscopy was used to determine the orientation of the films magnetization, which was found to be controlled by both the sputtering power and the thickness of the films. Additionally, the coupling between the SFO films and a deposited cobalt overlayer was studied by means of synchrotron-based spectromicroscopy techniques. A structural coupling at the SFO/Co interface is suggested to account for the expetimental observations. Micromagnetic simulations were performed in order to reproduce the experimental behaviour of the system., Comment: 17 pages, 11 figures. Submitted to Journal of Physics D: Applied Physics. Second version, improved after first round of reviews

Published
2020
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25. Selective molecular recognition of polycyclic aromatic hydrocarbons (PAHs) on calix[4]arene-functionalized Ag nanoparticles by surface-enhanced Raman spectroscopy

Author

Leyton, P., Sanchez-Cortes, S., Garcia-Ramos, J.V., Domingo, C., Campos-Vallette, M., Saitz, C., and Clavijo, R.E.

Subjects
Molecular structure -- Research, Calixarenes -- Chemical properties, Raman spectroscopy -- Usage, Polycyclic aromatic hydrocarbons -- Chemical properties, Chemicals, plastics and rubber industries
Abstract

Surface-enhanced Raman scattering (SERS) spectroscopy was used to detect trace concentrations of polycyclic hydrocarbons (PAHs). New SERS substrates were developed, which consisted Ag nanoparticles either in suspension or immobilized on glass, obtained by a new method and covered by adsorbed self-assembled calix[4]arene molecules.

Published
2004

36. Spectroscopic characterization of pyrophosphate incorporation during extraction of peat humic acids

Author

Francioso, O., Ciavatta, C., Tugnoli, V., Sanchez-Cortes, S., and Gessa, C.

Subjects
Pyrophosphates -- Research, Extraction (Chemistry) -- Research, Soils -- Humic acid content, Humic acid -- Research, Earth sciences
Abstract

Extraction procedures represent a crucial point in the study of the molecular structure of humic substances (HS). Although alkaline extractants such as NaOH plus [Na.sub.4][P.sub.2][O.sub.7] are usually employed for the extraction of the HS from soil and peat, little information concerning the interaction between extractants and humic acids is available. In this study, the results on the molecular structure of humic acids (HA) extracted and separated from a Sphagnum Irish peat sample with an alkaline pyrophosphate solution (0.1 M NaOH + 0.1 M [Na.sub.4][P.sub.2][O.sub.7]) are reported. The HA were redissolved in 5 mM NaCl, fractionated in six cut-off fractions (nominal molecular weight: HA >300, 100-300, 50-100, 20-50, 10-20, and 5-10 kDa) using a tangential ultrafiltration system. All samples were dialyzed against distilled water and then freeze-dried. Fourier-transform infrared (FT-IR) and 31P nuclear magnetic resonance (NMR) spectroscopies were applied to characterize the incorporation of pyrophosphate (PP) in both the unfractionated HA and in the six HA fractions. Spectroscopic analyses showed that it was possible to assign a given pattern of bands to define the structure of phosphate: PP was present only in the unfractionated HA, whereas orthophosphate was present in both the high molecular weight and lower molecular weight fractions. The high concentration of phosphate found in the lower molecular weight HA fractions has been attributed to the presence of metals and the oxygenated groups of HA. The changes in the relative intensity of the bands attributed to oxygenated functional groups observed in the FT-IR spectra could be assigned to the interaction of phosphate groups with metal cations, which are involved in a coordination complex with the oxygenated groups.

Published
1998

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