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Item type:Publication, Determination of the working temperature of the MOS sensors for detection of ethanol and methanol(Atena Editora, 2022-09-05)In this work, some peruvian red wines were analyzed using gas chromatography coupled to mass spectrometry (GC-MS) and it was determined that ethanol was the major volatile component present in the aroma (12 % in volume). followed by methanol (2-3 % in volume). Some MOS sensors based on SnO 2 doped with Pd and Pt were prepared by wet impregnation with metallic charges from 0.1 to 0.5% and were tested with the same Peruvian wines. The stability and reproducibility of the sensing signal was analyzed at different working temperatures (200, 220, 240, 260 and 280 C). The best working temperature at which the highest intensity of the response signal of the sensors was obtained at 260 C. In most of the cases studied, the sensing signal of the sensors was in general repetitive and stable, maintaining its amplitude and shape during long periods of the analysis. However, at the temperature of 280 C the signal loses intensity and in contact with methanol the signal is distorted. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Application of multivariate methods to the differentiation of Peruvian wines(2022-01-14)This work presents the results of the sensing analysis of Peruvian wines of known (Commercial wines) and handmade brands, using electronic noses (E-noses) which consist of an array of sensors based on tin oxide doped with Pd or Pt, and some with zeolite coating. The combinations of the sensors were performed seeking to obtain the best discrimination of the wines with the multivariate methods, with a high level of confidence and a good distribution of the results. The Principal Component Analysis (PCA), cluster and factorial results showed that the electronic noses allowed to efficiently identify wines of known brand from those of handmade brand, revealing the way in which the wines have been produced. On the other hand, the multivariate methods applied to the electronic noses made up of SnO2 sensors doped with palladium showed a clear differentiation of Borgoña-type wines from wines of handmade brand and evidenced the formation of agglomerations between red and Rosé wines. The application of PCA, cluster and factorial obtained in this study allowed to obtain good results in the differentiation of wines, even with electronic noses formed with a low number of sensors. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Una revisión a los electrolitos poliméricos de las baterías ion litio(2023-01-23)Las baterías de Ion Litio son una de las aplicaciones potenciales del mundo de los materiales y el campo de la energía.Se encuentran en la revolución de los dispositivos electrónicos (celulares, laptops, etc.).Así también, como en los autos a corriente eléctrica.Estas baterías tienen que mejorar sus características, optimizando su energía específica, densidad de energía volumétrica, razón de carga, estabilidad, seguridad, entre otras.Además, las baterías ion-litio se emplean para suplir las fuentes de energía convencionales, siendo más amigables con el medio ambiente.Existen varios aspectos importantes de las baterías de Ion-Litio, entre ellos se encuentran los mecanismos de transporte del ion litio, las principales propiedades físicas y químicas y las técnicas de preparación de los componentes de las baterías, principalmente de los electrolitos.En el caso de los electrolitos de base polimérica, los cuales son los que trataremos en esta revisión bibliográfica, se encuentran contenidos en tres las clases fundamentales: los Electrolitos Poliméricos libres de Solventes (SPEs), los Electrolitos Poliméricos de Gel (GPEs) y los Electrolitos Poliméricos de Compositos (CPEs).Estos electrolitos sólidos pueden ser utilizados en baterías de ion litio de alto voltaje, baterías ion litio flexibles, baterías de metal Litio, baterías Li-S, baterías Li-O 2 y baterías ion litio inteligentes.Los prerrequisitos para un electrolito polimérico para baterías de litio son 1) alta conductividad iónica a temperaturas ambiente y sub-ambiente 2) buena fuerza mecánica 3) apreciable número de transferencia 4) estabilidades térmica y electroquímica, y 5) mejor compatibilidad con los electrodos. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Study of the Methanol Concentration in Commercial Wines and Its Influence on the Detection of Quality and Possible Adulteration of Wines(2023-04-06)In the present study, the variation of the sensitivity of the sensors prepared from SnO 2 doped with Pt, in contact with different concentrations of methanol present in Peruvian wines using an array of sensors (electronic noses), in order to find which sensors were the most appropriate to differentiate commercial wines from adulterated ones, it was found that methanol It is found in a higher percentage in adulterated wines than in commercial ones.sensors Pt-SnO 2 coated with zeolite Y were the ones that presented a higher detection of this alcohol.Zeolite can act as a selective element, especially in platinum-doped sensors.In the principal component analysis (PCA) obtained, a good total variance was observed (the value is missing) in the results for both Nose 1 and Nose 2 (greater than 70%) with correlations close to zero, which indicates the independence of the observations.With Nose 1, built by sensors based on Pt-SnO2, a good differentiation of Peruvian wines of known brands was achieved with respect to those of unknown brands (possible adulterated wines) when applying the PCA method.Through the cluster analysis and the Factorial Analysis, the results obtained from the PCA were corroborated.Additionally, with the Factorial Analysis a high value was obtained in the variance (99.26%) of the two factors.