Aaron Rodriguez

Aaron Rodriguez
Universidad Politécnica de Santa Rosa Jáuregui · DIDETEP

PhD

About

48
Publications
44,945
Reads
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134
Citations
Citations since 2017
31 Research Items
106 Citations
2017201820192020202120222023051015202530
2017201820192020202120222023051015202530
2017201820192020202120222023051015202530
2017201820192020202120222023051015202530
Additional affiliations
September 2014 - present
UPSRJ
Position
  • Professor-Researcher
October 2003 - August 2014
CENAM
Position
  • Metrologist
January 2000 - May 2002
CIDETEQ
Position
  • PhD Student

Publications

Publications (48)
Article
Full-text available
Biofuel production has increased significantly in several countries in recent decades. Differ- ent evaluation techniques are required for their characterization. The study measures the properties of the obtained biodiesel and a commercial diesel sample, using the techniques of open circuit potential, linear scanning voltammetry and electrochemical...
Preprint
Full-text available
Evaluating human thermal comfort has been a difficult task, and sometimes, it has not been possible to consider several of the individual’s physiological characteristics. Nowadays, the development of electronic devices allows measuring new variables and performing a personalised assessment. Skin temperature has been the most measured variable in co...
Article
The measurement of the interfacial temperature variation associated with the electrochemical Peltier heat has been carried out by employing a variety of temperature sensors. Among them, the use of a high-precision thermistor inserted in the working electrode is a sensitive arrangement with satisfactory precision to measure the temperature variation...
Article
Full-text available
Magnetite nanoparticles (MNPs) have attracted great interest due to their low human toxicity and applications in different fields. Electrochemical methods have been proposed to obtain this type of nanoparticles, allowing better control of the size and size distribution than conventional strategies. Additionally, it has been reported that when they...
Article
La metrología es la disciplina encargada de estudiar las mediciones y sus aplicaciones en las diferentes áreas de la ciencia y tecnología. La necesidad de reportar y establecer mediciones exactas y confiables en las ciencias biológicas y de la salud ha conducido a estas áreas a adoptar las normas y lineamientos de la metrología en las actividades d...
Article
Full-text available
Coatings for filtration applications based on epoxy resin mixtures with isopropanol were synthesized using the dip-coating technique. The nanomaterials used were carbon nanospheres (CNS) synthesized by chemical vapor deposition (CVD) and commercially obtained Vulcan XC-72 (VC). The permeation flux and permeability of the coatings were determined by...
Article
Full-text available
This work presents a mechanistic study of the electrochemical synthesis of magnetite nanoparticles (NPs) based on the analysis of the electrochemical impedance spectroscopy (EIS) technique. After a discussion of the mechanisms reported in the literature, three models are devised and a prediction of their EIS spectra is presented. The approach consi...
Article
The ferricyanide/ferrocyanide system has been historically utilized as an electrochemical standard under typical conditions, including dilute concentrations and narrow polarization ranges. Although deviations in the system’s reversibility have been reported in broader experimental conditions, an electrochemical study that integrates the factors rel...
Article
In honor of Prof. Dr. Fritz Scholz in his recent retirement. This work proposes a theoretical framework to obtain the frequency response of molar electrochemical Peltier heat and entropy changes induced by a modulated electrical signal. This is based on an internal energy balance developed for a working electrode thermistor in ac regime. Then, from...
Article
New analytical correlations between impedance magnitude and phase are developed and presented. These correlations are used for the assessment of impedance spectroscopy data. As correlations are obtained, they can be calculated point to point at each frequency of the spectra with no need to establish explicit premises related to stability, linearity...
Article
For many years, in electrochemical processes, carbon nanostructures with metal-supported have been employed as electrodes due to their high surface area, chemical stability, and excellent performance as catalyst support by allowing a better electronic transfer. Nevertheless, on the surface, metallic nanoparticles are susceptible to corrosion. Inste...
Article
Full-text available
Deposition parameters effect such as projection distance and argon gas flow as carrier gas on the consistency and thickness of the thermally grown oxide (TGO) layer obtained by plasma thermal spray were studied. In addition, an aging heat treatment without a protective atmosphere was performed to determine the thermal barrier’s performance. The thi...
Preprint
Full-text available
A feasible method to acquire the temperature variation associated with the electrochemical Peltier heat due to a sinusoidal potential perturbation depending on variable frequency is presented. The results are qualitatively interpreted with a new transfer function named Variation of Interfacial Temperature (VIT). The experimental determination of th...
Article
Full-text available
The standardization of secondary electrolytic conductivity cells requires the use of a certified reference material. The accepted certification method involves electrochemical impedance spectroscopy (EIS) to estimate the material’s solution resistance. This method normally assumes that the impedance’s imaginary component can be neglected; and hence...
Article
We analyzed the electrode geometry to obtain the potential (E) and current density (J) distributions at the surface of a skin phantom (SP), in this case a planar surface. Two electrode geometries were tested: a circular electrode (CiE) and a rectangular electrode (ReE). First, by a finite element simulation, we calculated the E and J distributions...
Article
Full-text available
Electrochlorination systems have become popular. Their hydrodynamic behavior affects the efficiency and power consumption but the reaction environment is complex due to the complex flow arising from gas evolution at the electrodes. Water reduction at the stainless steel cathode generates a large amount of small hydrogen bubbles being then, the only...
Conference Paper
Full-text available
Resumen: Existen diferentes actividades científicas y educativas en las que se pueden aplicar los conceptos de la física para desarrollar sistemas de medición que permitan conocer los valores de diferentes propiedades para un fin específico. Los líquidos tienen diferentes propiedades físicas y quimicas, en este caso, las propiedades físicas, tales...
Poster
Full-text available
This paper makes a comparison between the techniques of ultrasonic and ultrasonic probe with the purpose of finding short times to obtain the CQD and N-CQD. The characterization of photoluminescent properties of the nanoparticles were realized by fluorescent spectrophotometry, UV-Vis spectroscopy and microscopy electron scanning (SEM). The literatu...
Article
Magnetite is an iron oxide composed of ferrous-ferric oxide, because of its magnetic properties is used in different areas. In literature there are proposals of reaction mechanisms for the formation of magnetite when it is produced electrochemically, however, these do not seem to be very clear since there are inconsistencies in their formulation. I...
Poster
Full-text available
En el estudio de propiedades fisicoquímicas en tejidos biológicos, es de suma importancia el desarrollo y uso de materiales análogos que permitan determinar factores analíticos clave en la medición, entre las ventajas de esta metodología tenemos el menor uso de muestras biológicas y un mejor control o eliminación de variables. Al respecto, en el tr...
Article
This work deals with the reaction environment analysis (hydrodynamic and mass transport characterization) inside the flow channel of a parallel plate electrolyzer. Different electrode gap and inlet configurations were tested using computational and experimental techniques. Computational methods are based on numerical solution of mathematical models...
Article
Full-text available
Biodiesel from different sources were synthetized according to transesterification method. Actually, there are different methods to characterize these fuels, but majority are physicochemical techniques, some of they, like water content by Karl-Fischer method are really complex. Because electrochemical techniques offer fast and accurate results, an...
Conference Paper
Full-text available
Resumen En este artículo se presentan los resultados de la revisión bibliográfica para los métodos analíticos disponibles actualmente para la determinación de la calidad de combustibles líquidos (turbosina) usando los parámetros más relevantes. Esta es una entrega parcial, ya que proyecto completo es desde el diseño, e implementación de un laborato...
Conference Paper
Full-text available
A stable and homogeneous (disperse) solution of nanoparticles is a necessity for the good use and effective applications of nanomaterials in the laboratory and in industry. Nanomaterials have a natural tendency to form aggregates. There are several strategies to reduce this situation, including functionalization, solutions in ionic liquids and solu...
Conference Paper
Full-text available
El proceso para la medición de magnitudes en química analítica involucra un conjunto de pasos subsecuentes que determinan la calidad de los resultados. A diferencia de los procesos físicos de medición, en química la complejidad se incrementa principalmente por la presencia de la matriz de la muestra lo que en muchas ocasiones hace necesaria la impl...
Conference Paper
Full-text available
Green materials form weeds original of Queretaro
Article
Full-text available
This study describes the process of evaluating a commercially available copperzinc alloy with the goal of creating an internal reference material (RM). The intended use of this candidate reference material is to evaluate the percentage of alpha and beta phases to verify the accuracy in quantifying phase percentages according to the ASTM E562-11 “St...
Conference Paper
Full-text available
Colors exhibited by butterfly wings are usually contributed by two sources: pigments and periodical submicrometer structures, which are also referred to as "chemical" and "physical" colors, respectively [1,2]. The photonic crystals are dielectric media with a periodic distribution of their refractive indexes. In photonic crystals well defined range...
Conference Paper
Full-text available
Resumen: En este trabajo se presenta una revisión de cómo la ciencia de las mediciones se ha integrado en la currícula de diferentes programas educativos en instituciones de educación superior en México. Como caso de éxito se cita la creación de la Ingeniería en Metrología Industrial en la Universidad Politécnica de Santa Rosa Jáuregui (UPSRJ), dan...
Article
Full-text available
The term measurement process is used in specialized literature and in the international standards, but is currently not defined in the International Vocabulary of Metrology (VIM). While the third edition of the VIM has a definition for measurement that includes measurement process as a synonym, other references such as ISO 10012 " measurement manag...
Article
Full-text available
The main goal of method validation is to demonstrate that the method is suitable for its intended purpose. One of the advantages of analytical method validation is translated into a level of confidence about the measurement results reported to satisfy a specific objective. Elemental composition determination by wavelength dispersive spectrometer (W...
Article
The Polytechnic University of Santa Rosa Jáuregui (UPSRJ) is a Mexican public institution where the Industrial Metrology Engineering undergraduate program (IMEUP) has recently been initiated. The program’s curriculum develops the skills required to enjoy a successful career in metrology. To achieve this goal, the program includes two part-time inte...
Article
Full-text available
Results of CCQM-K99 key comparison on unknown phosphate buffer pH ~ 7.5 at 5 °C, 15 °C, 25 °C, 37 °C and 50 °C are reported. Good agreement is found between the majority of participants. Main text To reach the main text of this paper, click on Final Report. Note that this text is that which appears in Appendix B of the BIPM key comparison database...
Article
Full-text available
Physicochemical description of the electrochemical impedance for an ideally polarized interface through the application of Nernst-Planck-Poisson (NPP) model, linearized by Debye-Falkenhagen (D-F) approximation is presented. This description involves physicochemical parameters instead of equivalent circuits. Its simple analytical solution is shown i...
Conference Paper
Full-text available
Los óxidos mixtos con frecuencia presentan mayor eficiencia fotocatalítica que las sustancias puras, debido a mayor área superficial y generando nuevos y diferentes sitios activos, por lo que, el fenómeno de fotocatalisis tiene mayor posibilidad de replicarse.
Conference Paper
Full-text available
La metrología está presente en todos los ámbitos de las ciencias, y la trazabilidad metrológica garantiza que los resultados obtenidos en un laboratorio o empresa puedan ser comparables en cualquier parte del mundo. En electroquímica, es poco lo que se ha incluido la metrología. Se presentan ideas para introducir la metrología en los laboratorios d...
Article
Full-text available
At the SIM meeting in Buenos Aires, from 30 May 2012 to 1 June 2012, it was decided to perform a RMO Key Comparison and a Pilot Study to evaluate the performance of SIM national metrology institutes for measuring electrolytic conductivity. The Brazilian Institute of Metrology, INMETRO, agreed to act as coordinating laboratory. The proposed RMO Key...
Article
Full-text available
The aim of key comparison CCQM-K105 was to demonstrate the measurement capabilities of the participating institutes with respect to the conductivity of multi-component aqueous salt solutions. Practical salinity results are currently not traceable to metrological references consistent with the International System of Units (SI). Nevertheless, salini...
Article
Full-text available
Linear voltammetry and electrochemical impedance spectroscopy experiments were performed in order to obtain basic information about the electrochemical behavior of the primary cell of electrolytic conductivity at Centro Nacional de Metrología. Linear voltammetry shows that the amplitude of the sinusoidal perturbation must be smaller than 300 mV. El...
Conference Paper
Full-text available
A partir del año 2000 se incremento en México la demanda por la acreditación de los laboratorios analíticos de ensayos y calibraciones bajo la plataforma de la norma ISO-IEC-17025:2005. Esta Norma es aplicable a todas las organizaciones que realizan ensayos y/o calibraciones. Éstas incluyen, por ejemplo, los laboratorios de primera, segunda y terce...
Article
Full-text available
Magnetic iron oxide nanoparticles of controlled size distribution were electrochemically synthesized applying a dissymmetric pattern of potential pulses to iron-based electrodes in aqueous media. The best pattern was determined through a design of experiments based on a previous voltammetric study. The applied method conveys an optimization of prev...
Article
Magnetite nanoparticles were supported on carbon paste electrode and characterized by low scan rate voltammetry and electrochemical impedance spectroscopy (EIS) to obtain mechanistic information related to its oxidation and reduction in acid media.The voltammograms showed only one reduction and one oxidation peak for the supported magnetite, which...
Article
According to the experience of the successful implementation of proficiency tests (PT) by using the certified reference value as the assigned value, a new scheme of evaluation is presented by suggesting the use of the uncertainty associated with the certified value. The technical performance of laboratories is evaluated by the parameter quadratic m...

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Projects (2)
Project
Identificar la influencia de la distribución de corriente primaria sobre la determinación de la resistencia del electrolito. Determinar la geometría de electrodo adecuada para correlacionar como variable independiente la distancia entre los electrodos de referencia con la variable dependiente resistencia del electrolito.