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Valdés M, Mollar M, Vázquez M, Marí B. Pulsed and potentiostatic electrodeposition of CuInSe2 on gold-coated alumina substrates. J APPL ELECTROCHEM 2013. [DOI: 10.1007/s10800-013-0549-y] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Vivas LG, Ivanov YP, Trabada DG, Proenca MP, Chubykalo-Fesenko O, Vázquez M. Magnetic properties of Co nanopillar arrays prepared from alumina templates. NANOTECHNOLOGY 2013; 24:105703. [PMID: 23416958 DOI: 10.1088/0957-4484/24/10/105703] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
The preparation of magnetic nanopillars from anodic alumina templates represents a cheap way to obtain extensive ordered arrays, and thus is very appealing for nanotechnology applications. In this paper we report the preparation of arrays of Co nanopillars with 120 nm height and varying diameter. The high anisotropy of Co offers an additional possibility to control their magnetic properties. The magnetic properties of arrays of Co nanopillars are studied both experimentally and by micromagnetic simulations. Experiment and modeling show crucial changes of hysteresis loops when the diameter is increased. Magnetic data are interpreted considering the change of crystalline structure as well as the influence of geometry. The micromagnetic simulations explain the measured magnetic properties by the role of magnetocrystalline anisotropy and the combined influence of the shape anisotropy and the interactions. They also show the change in the reversal mode with the increased diameter from vortex propagation to curling when the field is applied parallel to the nanopillar axis, and from coherent rotation to curling when it is applied perpendicular.
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Martelo-Vidal MJ, Mesas JM, Vázquez M. Low-salt restructured fish products from Atlantic mackerel (Scomber scombrus) with texture resembling turkey breast. FOOD SCI TECHNOL INT 2012; 18:251-9. [PMID: 22701058 DOI: 10.1177/1082013211415175] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Atlantic mackerel (Scomber scombrus) is a pelagic and migratory species that is usually caught with other fish as bycatch. The aim of this work was to obtain low-salt restructured fish products from Atlantic mackerel resembling turkey breast using transglutaminase (0.2 U/g) as binder. NaCl concentration (0-20 g/kg), temperature (25-40 °C) and time of incubation (30-90 min) were assayed. The texture parameters (Warner-Bratzler force and Warner-Bratzler work) and expressible water were compared to those of turkey breast. Mathematical models were obtained to determine the effect of these variables on the texture of Atlantic mackerel restructured products. Optimal conditions to obtain a similar texture than turkey breast were found. The overall optimization point out that the treatment at 31.8 °C for 63.35 min using a NaCl concentration of 8.45 g/kg allowed to obtain restructured products from Atlantic mackerel with texture and expressible water similar to those of turkey breast. Color parameters (L*, a* and b*) of the product were also similar to those of turkey breast. The results showed the feasibility of producing low-salt restructured products from Atlantic mackerel resembling turkey breast using transglutaminase.
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Vega V, Garcia J, Rosa WO, Vivas LG, Prida VM, Hernando B, Vázquez M. Magnetic properties of (Fe, Co)-Pd nanowire arrays. JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY 2012; 12:7501-7504. [PMID: 23035504 DOI: 10.1166/jnn.2012.6547] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
Ordered arrays of ferromagnetic nanowires with (Fe, Co)-Pd compositions have been fabricated from chloride based electrochemical baths by means of template-assisted electrodeposition into self-assembled nanopores of anodic alumina membranes. The nanowires have a diameter and inter-spacing distance of 72 nm and 105 nm, respectively, and around 0.6-1.6 microm in length. Their microstructure and basic magnetic properties are reported. Coercivity, remanence and respective angular dependences on the applied field up to +/- 3 T have been determined from room temperature hysteresis loops measured in a VSM. The study has been performed paying particular attention to the influence of increasing from about 27 up to 63 percent the Pd content in the nanowire alloy.
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Castán-Guerrero C, Sesé J, Bartolomé J, Bartolomé F, Herrero-Albillos J, Kronast F, Strichovanec P, Merazzo KJ, Vázquez M, Vavassori P, García LM. Fabrication and magnetic characterization of cobalt antidot arrays: effect of the surrounding continuous film. JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY 2012; 12:7437-7441. [PMID: 23035490 DOI: 10.1166/jnn.2012.6537] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
We have performed an experimental study on the influence of a ferromagnetic continuous film in the magnetization reversal processes in discrete submicrometric antidot arrays fabricated on it. In order to compare the magnetic properties, two sets of antidot arrays have been fabricated over a cobalt thin film: embedded in the continuous film, and isolated by a trench surrounding the array. X-ray photoemission electron microscopy images of the virgin state show the same magnetic domain distribution in both sets of samples, finding no evidence of any effect of the surrounding film. This result is supported by the hysteresis loops measured with magneto-optical Kerr effect, as isolated and non-isolated arrays present almost coincident loops. A huge increase of the coercivity of the film is achieved, and the expected dependence on the geometrical parameters of the array is found, connecting the previous studies on the micro- and nanometric scales.
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Valdés M, Vázquez M. Composition, morphology, and optical properties of CuInSe2 thin films electrodeposited using constant and pulsed potentials. J Solid State Electrochem 2012. [DOI: 10.1007/s10008-012-1821-5] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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57
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Rosa WO, Navas D, Asenjo A, Prida VM, Hernando B, Vázquez M. CoCrPt/Ti perpendicular media onto nanostructured polymer templates. JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY 2012; 12:4859-4863. [PMID: 22905541 DOI: 10.1166/jnn.2012.4909] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
The fabrication and the study of the magnetic properties of CoCrPt/Ti nanostructures produced by sputtering onto ordered polymer templates are reported here. Samples exhibit a significant out-of-plane component of the magnetization higher than for planar films, and it is stronger for the thicker CoCrPt films, and for nanostructured films with the shorter period ordering. The shape of the polymeric templates plays an important role for the determination of magnetic easy-axis. Magnetic Force Microscopy images of the samples show a single magnetic domain structure with high out-of-plane anisotropy for the samples with longer ordering (480 nm period).
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Ibarra M, Fagiolino P, Vázquez M, Ruiz S, Vega M, Bellocq B, Pérez M, González B, Goyret A. Impact of food administration on lopinavir-ritonavir bioequivalence studies. Eur J Pharm Sci 2012; 46:516-21. [PMID: 22522225 DOI: 10.1016/j.ejps.2012.04.004] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2011] [Revised: 02/23/2012] [Accepted: 04/03/2012] [Indexed: 10/28/2022]
Abstract
A bioequivalence study in 16 Caucasian healthy volunteers (eight male, eight female), comparing plasma drug concentrations after a single oral dose of lopinavir and ritonavir (400 and 100mg, respectively), was carried out following a two-period, two-sequence, two-treatment, randomized crossover design. Formulations were given 15 min after a moderate-fat breakfast in order to diminish both the intrinsic highly-variable performance and the sex differences observed in bioequivalence trials under fasting conditions. Ninety percent confidence intervals for the Test/Reference (T/R) ratio of geometric means for area under concentration-time curve (AUC) and maximum concentration (C(MAX)), either for lopinavir or ritonavir, were within the range of 0.80-1.25. Coprandial administration of formulations not only reduced the number of subjects required for bioequivalence assessment, reducing both ethical and economic cost of the trial, but also the sex differences in the T/R ratio of means.
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Castillo-Ruiz O, Velazquez G, Uresti-Marín R, Mier N, Vázquez M, Ramírez de León J. Estudio de los hábitos alimentarios de niños de 4-6 años de Reynosa, Tamaulipas (México). CYTA - JOURNAL OF FOOD 2012. [DOI: 10.1080/19476337.2010.524941] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
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Campanella H, Jaafar M, Llobet J, Esteve J, Vázquez M, Asenjo A, del Real RP, Plaza JA. Nanomagnets with high shape anisotropy and strong crystalline anisotropy: perspectives on magnetic force microscopy. NANOTECHNOLOGY 2011; 22:505301. [PMID: 22107927 DOI: 10.1088/0957-4484/22/50/505301] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
We report on a new approach for magnetic imaging, highly sensitive even in the presence of external, strong magnetic fields. Based on FIB-assisted fabricated high-aspect-ratio rare-earth nanomagnets, we produce groundbreaking magnetic force tips with hard magnetic character where we combine a high aspect ratio (shape anisotropy) together with strong crystalline anisotropy (rare-earth-based alloys). Rare-earth hard nanomagnets are then FIB-integrated to silicon microcantilevers as highly sharpened tips for high-field magnetic imaging applications. Force resolution and domain reversing and recovery capabilities are at least one order of magnitude better than for conventional magnetic tips. This work opens new, pioneering research fields on the surface magnetization process of nanostructures based either on relatively hard magnetic materials-used in magnetic storage media-or on materials like superparamagnetic particles, ferro/antiferromagnetic structures or paramagnetic materials.
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61
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Calatayud M, Vázquez M, Devesa V, Vélez D. Intestinal absorption of arsenic species using different in vitro models. Toxicol Lett 2011. [DOI: 10.1016/j.toxlet.2011.05.665] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Vázquez M, Iriondo M, Agut T, Poó M, Ibáñez M, Krauel X. Abandonos en el seguimiento de recién nacidos de muy bajo peso antes de los 2 años. An Pediatr (Barc) 2011; 74:309-16. [DOI: 10.1016/j.anpedi.2010.11.020] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2010] [Revised: 09/07/2010] [Accepted: 11/01/2010] [Indexed: 12/01/2022] Open
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Núñez N, Vázquez M, González JR, Jiménez FJ, Bautista J. Instrumentation for accelerated life tests of concentrator solar cells. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2011; 82:024703. [PMID: 21361622 DOI: 10.1063/1.3541800] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
Concentrator photovoltaic is an emergent technology that may be a good economical and efficient alternative for the generation of electricity at a competitive cost. However, the reliability of these new solar cells and systems is still an open issue due to the high-irradiation level they are subjected to as well as the electrical and thermal stresses that they are expected to endure. To evaluate the reliability in a short period of time, accelerated aging tests are essential. Thermal aging tests for concentrator photovoltaic solar cells and systems under illumination are not available because no technical solution to the problem of reaching the working concentration inside a climatic chamber has been available. This work presents an automatic instrumentation system that overcomes the aforementioned limitation. Working conditions have been simulated by forward biasing the solar cells to the current they would handle at the working concentration (in this case, 700 and 1050 times the irradiance at one standard sun). The instrumentation system has been deployed for more than 10 000 h in a thermal aging test for III-V concentrator solar cells, in which the generated power evolution at different temperatures has been monitored. As a result of this test, the acceleration factor has been calculated, thus allowing for the degradation evolution at any temperature in addition to normal working conditions to be obtained.
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Pérez Alvarez-Ossorio JR, Martín Sempere MJ, Fernández MT, Vázquez M, Galbán C, Plaza L, Aguillo I, Ronda C, Cabrero A, Hernando S, Gómez I. Análisis de la producción científica española en ecología y medio ambiente. 1989-1993. REVISTA ESPANOLA DE DOCUMENTACION CIENTIFICA 2010. [DOI: 10.3989/redc.1997.v20.i4.572] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022] Open
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Valdés M, Collado A, Bargalló N, Vázquez M, Rami L, Gómez E, Salamero M. Increased glutamate/glutamine compounds in the brains of patients with fibromyalgia: a magnetic resonance spectroscopy study. ACTA ACUST UNITED AC 2010; 62:1829-36. [PMID: 20191578 DOI: 10.1002/art.27430] [Citation(s) in RCA: 71] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
OBJECTIVE Fibromyalgia (FM) has been defined as a systemic disorder that is clinically characterized by pain, cognitive deficit, and the presence of associated psychopathology, all of which are suggestive of a primary brain dysfunction. This study was undertaken to identify the nature of this cerebral dysfunction by assessing the brain metabolite patterns in patients with FM through magnetic resonance spectroscopy (MRS) techniques. METHODS A cohort of 28 female patients with FM and a control group of 24 healthy women of the same age were studied. MRS techniques were used to study brain metabolites in the amygdala, thalami, and prefrontal cortex of these women. RESULTS In comparison with healthy controls, patients with FM showed higher levels of glutamate/glutamine (Glx) compounds (mean +/- SD 11.9 +/- 1.6 arbitrary units [AU] versus 13.4 +/- 1.7 AU in controls and patients, respectively; t = 2.517, 35 df, corrected P = 0.03) and a higher Glx:creatine ratio (mean +/- SD 2.1 +/- 0.4 versus 2.4 +/- 1.4, respectively; t = 2.373, 35 df, corrected P = 0.04) in the right amygdala. In FM patients with increased levels of pain intensity, greater fatigue, and more symptoms of depression, inositol levels in the right amygdala and right thalamus were significantly higher. CONCLUSION The distinctive metabolic features found in the right amygdala of patients with FM suggest the possible existence of a neural dysfunction in emotional processing. The results appear to extend previous findings regarding the dysfunction in pain processing observed in patients with FM.
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Sanz R, Jaafar M, Hernández-Vélez M, Asenjo A, Vázquez M, Jensen J. Patterning of rutile TiO2 surface by ion beam lithography through full-solid masks. NANOTECHNOLOGY 2010; 21:235301. [PMID: 20463385 DOI: 10.1088/0957-4484/21/23/235301] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
In this work we present and discuss the nanopatterning of rutile TiO(2) single crystal surfaces following their irradiation with energetic heavy ions through a stencil mask of Ni filled self-ordered porous anodic alumina. After etching in HF a corrugated surface morphology is obtained composed of parallel alternate furrows and ridges (or nanobars) 50 nm in diameter and with 100 nm pitch. In addition, isolated, but collapsed, TiO(2) nanorods are seen lying on the patterned surface. The stability of the nanopatterned surface under high temperatures treatments and crystalline properties are analyzed.
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Simón A, González-Fandos E, Vázquez M. Effect of washing with citric acid and packaging in modified atmosphere on the sensory and microbiological quality of sliced mushrooms (Agaricus bisporus L.). Food Control 2010. [DOI: 10.1016/j.foodcont.2009.11.012] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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69
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Solano J, Vázquez M, Rubio E, Sánchez I, Fuentes M, García F. Doppler ultrasound signal spectral response in the measurement of the blood flow turbulence caused by stenosis. ACTA ACUST UNITED AC 2010. [DOI: 10.1016/j.phpro.2010.01.077] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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70
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Castro-Briones M, Calderón G, Velazquez G, Rubio M, Vázquez M, Ramírez J. Mechanical and functional properties of beef products obtained using microbial transglutaminase with treatments of pre-heating followed by cold binding. Meat Sci 2009; 83:229-38. [DOI: 10.1016/j.meatsci.2009.05.002] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2008] [Revised: 04/29/2009] [Accepted: 05/05/2009] [Indexed: 10/20/2022]
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71
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Butta M, Infante G, Ripka P, Badini-Confalonieri GA, Vázquez M. M-H loop tracer based on digital signal processing for low frequency characterization of extremely thin magnetic wires. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2009; 80:083906. [PMID: 19725666 DOI: 10.1063/1.3206264] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
A high-sensitivity ac hysteresis loop tracer has been developed to measure the low frequency hysteresis loop of soft magnetic materials. It has been applied successfully to characterize straight pieces of amorphous glass-covered microwires with metallic nucleus down to 1.5 microm thick. Based on the electromagnetic induction law, the proposed design is extremely simple and exploits the capabilities of commercially available data acquisition cards together with digital signal processing in order to achieve high-sensitivity without the need of expensive analog equipment.
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Candelario-Rodríguez HE, Hurtado-González M, Morales-Castro J, Velazquez G, Ramírez JA, Loera-Gallardo J, Vázquez M. Efficacy of high hydrostatic pressure as a quarantine treatment to improve the quality of mango fruits infested by the Mexican fruit flyAnastrepha ludens. CYTA - JOURNAL OF FOOD 2009. [DOI: 10.1080/19476330903067953] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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73
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Sanz R, Jensen J, González-Díaz G, Martínez O, Vázquez M, Hernández-Vélez M. Continuous and Localized Mn Implantation of ZnO. NANOSCALE RESEARCH LETTERS 2009; 4:878-887. [PMID: 20596285 PMCID: PMC2894353 DOI: 10.1007/s11671-009-9327-5] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/25/2009] [Accepted: 04/24/2009] [Indexed: 05/16/2023]
Abstract
We present results derived from continuous and localized 35 keV (55)Mn(+) ion implantations into ZnO. Localized implantations were carried out by using self-ordered alumina membranes as masks leading to ordered arrays of implanted volumes on the substrate surfaces. Defects and vacancies in the small implantation volumes of ZnO were generated due to the implantation processes besides the creation of new phases. Rapid thermal annealing was applied in the case of continuous implantation. The samples were characterized by HRSEM, GIXRD, Raman spectroscopy and RBS/C. Magnetic characterization of the samples pointed out appreciable differences among the samples obtained by the different implantation methods. This fact was mainly attributed to the different volume/surface ratios present in the implanted zones as well as to the increase of Mn atom concentrations along the grain frontiers in the nanostructured surfaces. The samples also showed a ferromagnetic transition phase at temperature value higher than room temperature.
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Jaafar M, Gómez-Herrero J, Gil A, Ares P, Vázquez M, Asenjo A. Variable-field magnetic force microscopy. Ultramicroscopy 2009; 109:693-9. [DOI: 10.1016/j.ultramic.2009.01.007] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2008] [Revised: 01/13/2009] [Accepted: 01/20/2009] [Indexed: 10/21/2022]
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75
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Rosa WO, Jaafar M, Asenjo A, Vázquez M. Nanostructured Co film on ordered polymer nanohills: a base for novel magnetic nanostructures. NANOTECHNOLOGY 2009; 20:075301. [PMID: 19417412 DOI: 10.1088/0957-4484/20/7/075301] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
The preparation of a nanostructured polymer (poly(methyl methacrylate)--PMMA) replicating the order of an anodized aluminium (Al) template is first described. Nanohills at the PMMA surface are structured following the ordering of the template with tailored lattice parameter and hexagonal symmetry. A nanostructured Co magnetic film is then deposited by sputtering onto the polymer surface so keeping the high ordering induced by the precursor template. The magnetic properties depend on the polymer periodicity as well as on the sputtering conditions. In particular, single-domain or multidomain structures have been identified inside every Co/polymer hill depending on the lattice parameter. Moreover, an intrinsic distribution of the magnetic anisotropy can be deduced from the hysteresis loops.
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