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Alvarez-Herrera C.,Autonomous University of Chihuahua | Murillo-Ramirez J.G.,Research Center en Materiales | Perez-Reyes I.,Autonomous University of Chihuahua
Journal of Optics (United Kingdom) | Year: 2015

This work reports the thermal convection with imposed shear flow in a thin two-plate channel. Flow structures are investigated under heating asymmetric conditions and different laminar flow conditions. The dynamics of heat flow and the energy distribution were determined by visualization with the Schlieren technique and application of the proper orthogonal decomposition (POD) method. The obtained results from the POD mode analysis revealed that for some flow conditions the heat transfer is related to the energy of the POD modes and their characteristic numbers. It was possible to detect periodic motion in the two-plate channel flow from the POD mode analysis. It was also found that when the energy is distributed among many POD modes, the fluid flow is disorganized and unsteady. © 2015 IOP Publishing Ltd.

Hernandez-Gordillo A.,San Luis Potosi Institute of Scientific Research and Technology | Hernandez-Gordillo A.,National Autonomous University of Mexico | Obregon S.,University of Seville | Paraguay-Delgado F.,Research Center en Materiales | Rodriguez-Gonzalez V.,San Luis Potosi Institute of Scientific Research and Technology
RSC Advances | Year: 2015

Unprecedented photoactivity of silver nanoparticles photodeposited on nanocrystalline TiO2 for the efficient reduction of 4-nitrophenol at room temperature is reported. The use of Na2SO3 as a harmless scavenger agent for the reduction of a nitroaromatic endocrine disruptor yields a valuable 4-aminophenol reagent. © 2015 The Royal Society of Chemistry.

Maya-Cornejo J.,CIDETEQ | Ortiz-Ortega E.,Autonomous University of Queretaro | Alvarez-Contreras L.,Research Center en Materiales | Arjona N.,CIDETEQ | And 3 more authors.
Chemical Communications | Year: 2015

A membraneless nanofluidic fuel cell with flow-through electrodes that works with several fuels (individually or mixed): methanol, ethanol, glycerol and ethylene-glycol in alkaline media is presented. For this application, an efficient Cu@Pd electrocatalyst was synthesized and tested, resulting outstanding performance until now reported, opening the possibility of power nano-devices for multi-uses purposes, regardless of fuel re-charge employed. This journal is © The Royal Society of Chemistry 2015.

Rojas-George G.,Research Center en Materiales | Concha-Balderrama A.,Research Center en Materiales | Silva J.,Autonomous University of Ciudad Juarez | Fuentes L.,Research Center en Materiales | Reyes-Rojas A.,Research Center en Materiales
Ceramics International | Year: 2015

We present Ba/Co co-doping effects on BiFeO3 structure, optical, ferromagnetic, and ferroelectric properties at room temperature. XRD indicates a high distortion of the rhombohedral symmetry, confirmed by Raman spectroscopy, where a change in the intensity ratio of E-1/A1-1 vibrational modes is a result of the partial substitution of Fe3+ by Co3+. This induces an A-site disorder in the FeO6 octahedra. Co2+ acts as grain growth inhibitor reducing average grain sizes from 304 nm (without cobalt) to 200 nm (with cobalt) after sintering. The magnetization results show that the Co-cation impregnated samples have higher magnetization (31%) than doped and undoped samples. © 2015 Elsevier Ltd and Techna Group S.r.l. All rights reserved.

Martinez-Lopez A.L.,Ctaoa Research Center For Food And Development | Carvajal-Millan E.,Ctaoa Research Center For Food And Development | Miki-Yoshida M.,Research Center en Materiales | Alvarez-Contreras L.,Research Center en Materiales | And 3 more authors.
Molecules | Year: 2013

The aim of this research was to study the structural and textural characteristics of maize bran arabinoxylan (MBAX) microspheres. The laccase-induced cross-linking process was monitored by storage (G') and loss (G'') moduli changes in a 4% (w/v) MBAX solution. The G' and G'' values at the plateau region were 215 and 4 Pa, respectively. After gelation, the content of ferulic acid dimers decreased from 0.135 to 0.03 μg/mg MBAX, suggesting the formation of ferulated structures unreleased by mild alkaline hydrolysis. MBAX microspheres presented an average diameter of 531 μm and a swelling ratio value (q) of 18 g water/g MBAX. The structural parameters of MBAX microspheres were calculated from equilibrium swelling experiments, presenting an average mesh size of 52 nm. Microstructure and textural properties of dried MBAX microspheres were studied by scanning electron microscopy and nitrogen adsorption/desorption isotherms, respectively, showing a heterogeneous mesoporous and macroporous structure throughout the network. © 2013 by the authors.

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