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302 results on '"Agulló-Rueda, F."'

4. Iodine-substituted hydroxyapatite nanoparticles and activation of derived ceramics for range verification in proton therapy.

Author

Hernández, R. Magro, Muñoz-Noval, A., Briz, J. A., Murias, J. R., Espinosa-Rodríguez, A., Fraile, L. M., Agulló-Rueda, F., Ynsa, M. D., Tavares de Sousa, C., Cortés-Llanos, B., López, G. García, Nácher, E., García-Tavora, V., Mont i Geli, N., Nerio, A., Onecha, V. V., Pallàs, M., Tarifeño, A., Tengblad, O., and Silván, M. Manso

Abstract

Osteosarcoma is a radioresistant cancer, and proton therapy is a promising radiation alternative for treating cancer with the advantage of a high dose concentration in the tumor area. In this work, we propose the use of iodine-substituted hydroxyapatite (IHAP) nanomaterials to use iodine (127I) as a proton radiation tracer, providing access to range verification studies in mineralized tissues. For this purpose, the nanomaterials were synthesized at four iodine concentrations via hydrothermal synthesis. The materials were characterized via different microstructural techniques to identify an optimal high iodine concentration and pure apatite phase nanomaterial. Finally, such pure IHAP powders were shaped and irradiated with proton beams of 6 and 10 MeV, and their activation was demonstrated through subsequent decay analysis. The materials could be integrated into phantom structures for the verification of doses and ranges of protons prior to animal testing and clinical proton therapy treatments of tumors located deep under combined soft and calcified tissues. [ABSTRACT FROM AUTHOR]

Published
2024
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8. Enhancement of Rabi Splitting in a Microcavity with an Embedded Superlattice

Author

Dickerson, J. H., Mendez, E. E., Allerman, A. A., Manotas, S., Agullo-Rueda, F., and Pecharroman, C.

Subjects
Condensed Matter
Abstract

We have observed a large coupling between the excitonic and photonic modes of an AlAs/AlGaAs microcavity filled with an 84-({\rm {\AA}})/20({\rm {\AA}}) GaAs/AlGaAs superlattice. Reflectivity measurements on the coupled cavity-superlattice system in the presence of a moderate electric field yielded a Rabi splitting of 9.5 meV at T = 238 K. This splitting is almost 50% larger than that found in comparable microcavities with quantum wells placed at the antinodes only. We explain the enhancement by the larger density of optical absorbers in the superlattice, combined with the quasi-two-dimensional binding energy of field-localized excitons., Comment: 5 pages, 4 figures, submitted to PRB

Published
2001
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9. Raman spectroscopy of InN films grown on Si

Author

Agullo-Rueda, F., Mendez, E. E., Bojarczuk, N., and Guha, S.

Subjects
Condensed Matter - Materials Science
Abstract

We have used Raman spectroscopy to study indium nitride thin films grown by molecular beam epitaxy on (111) silicon substrates at temperatures between 450 and 550 C. The Raman spectra show well defined peaks at 443, 475, 491, and 591 cm{-1}, which correspond to the A_1(TO), E_1(TO), E_2^{high}, and A_1(LO) phonons of the wurtzite structure, respectively. In backscattering normal to the surface the A_1(TO) and E_1(TO) peaks are very weak, indicating that the films grow along the hexagonal c axis. The dependence of the peak width on growth temperature reveals that the optimum temperature is 500 C, for which the fullwidth of the E_2^{high} peak has the minimum value of 7 cm{-1}. This small value, comparable to previous results for InN films grown on sapphire, is evidence of the good crystallinity of the films., Comment: 3 pages, 1 eps figure, RevTeX

Published
1999
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13. Pair breaking by chain oxygen disorder in light-ion irradiated YBa_(2)Cu_(3)O_(x) thin films

Author

Arias Serna, Diego, Sefrioui, Zouhair, Loos, G., Agulló-Rueda, F., García Barriocanal, Javier, León Yebra, Carlos, Santamaría Sánchez-Barriga, Jacobo, Arias Serna, Diego, Sefrioui, Zouhair, Loos, G., Agulló-Rueda, F., García Barriocanal, Javier, León Yebra, Carlos, and Santamaría Sánchez-Barriga, Jacobo

Abstract

© 2003 The American Physical Society. We thank M. A. Alario for fruitful conversations. Financial support by Spanish CICYT Grant No. MAT 2000-1468 is also acknowledged., We report on the effect of oxygen disorder in the CuO chains on the superconducting properties of oxygen depleted YBa_(2)Cu_(3)O_(x)(YBCO). While moderate disorder, induced thermally, depresses the critical temperature as a result of a reduced carrier concentration, strong oxygen disorder and chain fragmentation induced by low energy (80 keV) He^(+) irradiation suppresses the critical temperature beyond the values expected from the reduction of the carrier density. This provides an experimental evidence of pair breaking by chain disorder and outlines the importance of chain states in the pairing mechanism in the YBCO family., Spanish CICYT, Depto. de Estructura de la Materia, Física Térmica y Electrónica, Fac. de Ciencias Físicas, TRUE, pub

Published
2023

14. Antibacterial Films of Silver Nanoparticles Embedded into Carboxymethylcellulose/Chitosan Multilayers on Nanoporous Silicon: A Layer-by-Layer Assembly Approach Comparing Dip and Spin Coating

Author

Fondo Nacional de Desarrollo Científico y Tecnológico (Chile), Comisión Nacional de Investigación Científica y Tecnológica (Chile), Universidad San Sebastián, Ministerio de Ciencia, Innovación y Universidades (España), Agencia Estatal de Investigación (España), Naveas, Nelson, Pulido, Ruth, Torres-Costa, Vicente, Agulló Rueda, F., Santibáñez, Mauricio, Malano, Francisco, Recio-Sánchez, Gonzalo, Garrido-Miranda, Karla A., Manso-Silván, Miguel, Hernández-Montelongo, Jacobo, Fondo Nacional de Desarrollo Científico y Tecnológico (Chile), Comisión Nacional de Investigación Científica y Tecnológica (Chile), Universidad San Sebastián, Ministerio de Ciencia, Innovación y Universidades (España), Agencia Estatal de Investigación (España), Naveas, Nelson, Pulido, Ruth, Torres-Costa, Vicente, Agulló Rueda, F., Santibáñez, Mauricio, Malano, Francisco, Recio-Sánchez, Gonzalo, Garrido-Miranda, Karla A., Manso-Silván, Miguel, and Hernández-Montelongo, Jacobo

Abstract

The design and engineering of antibacterial materials are key for preventing bacterial adherence and proliferation in biomedical and household instruments. Silver nanoparticles (AgNPs) and chitosan (CHI) are broad-spectrum antibacterial materials with different properties whose combined application is currently under optimization. This study proposes the formation of antibacterial films with AgNPs embedded in carboxymethylcellulose/chitosan multilayers by the layer-by-layer (LbL) method. The films were deposited onto nanoporous silicon (nPSi), an ideal platform for bioengineering applications due to its biocompatibility, biodegradability, and bioresorbability. We focused on two alternative multilayer deposition processes: cyclic dip coating (CDC) and cyclic spin coating (CSC). The physicochemical properties of the films were the subject of microscopic, microstructural, and surface–interface analyses. The antibacterial activity of each film was investigated against Escherichia coli (Gram-negative) and Staphylococcus aureus (Gram-positive) bacteria strains as model microorganisms. According to the findings, the CDC technique produced multilayer films with higher antibacterial activity for both bacteria compared to the CSC method. Bacteria adhesion inhibition was observed from only three cycles. The developed AgNPs–multilayer composite film offers advantageous antibacterial properties for biomedical applications.

Published
2023

34. Acknowledgements

Author

Martínez-Duart, J.M., primary, Martín-Palma, R.J., additional, and Agulló-Rueda, F., additional

Published
2006
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46. Spatially resolved MoOx phases by the laser oxidation of MoO2: a possible route for all-molybdenum oxide devices.

Author

de Melo, O., Agulló-Rueda, F., and Torres-Costa, V.

Abstract

MoO2 thin films were subjected to a laser localized oxidation process that allowed us to obtain different well defined MoOx phases. In particular, the spatially resolved MoO2, α-MoO3, β-MoO3, amorphous a-MoO3, and Mo4O11 regions were obtained as a function of the laser power and the distance to the laser focus. The origin of this spatial phase separation was investigated through a careful and exhaustive Raman mapping study covering several micrometres away from the laser focus and taking into account the thermochemical properties of the species involved. It was found that a sublimation/deposition process, driven by the different vapour pressures of the species, was responsible for the phase separation. At higher laser powers, a solid state reaction was observed to contribute as well. In the laser annealed tracks, distant lateral sidebands of oxide deposition were observed with composition that depended on the laser power and the distance to the centre of the track. The electrical measurements between the irradiated and non-irradiated regions showed a strong rectifying behaviour, revealing a transformation from metal-like to semiconducting Mo oxide phases, which may open the way to the development of laser written all-oxide electronic circuits. [ABSTRACT FROM AUTHOR]

Published
2021
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