Nanocomposites based on carbon nanotubes and poly (3-alkylthiophenes) for sensor and charge storage applications

Novel nanocomposites of poly (3-alkylthiophenes) with functionalized MWCNT were prepared. These nanocomposites were synthesized by in-situ polymerization of the polymer in presence of the nanotubes. Nanocomposites with poly (3-MT) were synthesized by using different weight percentages of functionalized nanotubes during synthesis while those with other polymers were prepared using 30 mg of nanotubes. A nanocomposite of poly (3-MT) with nonfunctionalized nanotubes and a physical mixture of poly (3-MT) and functionalized nanotubes was also prepared. The above nanocomposites were characterized by using techniques such as FTIR, UV-visible spectroscopy and TGA. These techniques were used to show the difference between the nanocomposites and the physical mixture and to establish the fact that a bonding existed between the nanotubes and the polymers. Cyclic voltammetry was used to study the electrochemical properties of the nanocomposite. Using the data from the voltammograms, the capacitance of the nanocomposite electrode was estimated. Different materials were investigated for their potential use as sensing materials in chemical sensors. A sensor was fabricated using eight different materials as sensing material. Functionalized MWCNT, non functionalized MWCNT, poly(3-methylthiophene), 3 different compositions of nanocomposite with functionalized MWCNT/poly (3-MT), nanocomposite with non functionalized MWCNT and 1:1 blend of functionalized MWCNT and poly(3-methylthiophene) were examined as sensing elements. The sensor was tested for its sensitivity, response time and selectivity towards a variety of chemicals such as chlorinated hydrocarbons, aldehydes, ketones etc

Development of Mathematical Model and Characterization of Internal Surface Obtained by Elasto-Abrasives Magneto-Spiral Finishing (EAMSF)

The implantation of stents and instruments with capillary action demands super-finished internal surfaces of the manufactured product. Elasto-abrasives magneto-spiral finishing (EAMSF) is the attempt made in this paper to enhance finishing productivity by incorporating the abrasive flow in spiral motion due to the presence of the magnetic field. Here, novel impregnated elasto-magnetic abrasive particles (IMPs) are used in a magnetic field-assisted environment to polish the inner walls of the workpiece. In EAMSF, magnetic force provides excess finishing pressure to the abrasives. In contrast, the high-impact polystyrene (HIPS) elasticity absorbs the extra force of the IMPs on the finishing surface. An Indigenous mathematical relation considering the physics of this superfinishing process indicating material removal shows a close resemblance to the experimental results with an error percentage of 1.03 has been developed. The results of the experimentation reveal that 50% concentration of abrasives and a magnetic field density of 18mT yield a superior surface finish with a Ra value equal to 0.053 μm and maximum material removal of 6.9 mg, while in the absence of a magnetic field, excellent surface finish with a Ra=0.266 μm and maximum material removal of 5.4 mg is achieved. In the presence of magnetic field density, significant enhancement of material removal, surface finish, and burr removal is observed. Finishing the surface at 50% abrasive concentration with a magnetic field represents regular finishing, and the trench marks on the original surface are removed after finishing

Chemical Coagulants And Moringa Oleifera Seed Extract For Treating Concrete Wastewater

Wastewater from concrete plants has a high pH and a high concentration of suspended solids, necessitating treatment before reuse or discharge into the environment. The objective of this study is to evaluate the efficiency of two chemical coagulants, aluminum sulfate (Al-2(SO4)(3)) and iron chloride (FeCl3), and a natural coagulant, Moringa oleifera (MO), all in their soluble forms, in the treatment of wastewater from concrete plants. To this end, the efficiencies of the three coagulants, in combinations with different proportions, were tested. The quality parameters of the wastewater obtained after the treatments were compared to the limit values for non-potable water. The use of coagulants in their soluble form potentiates their effect, especially when preparing the MO extract, i.e., greater amounts of the protein responsible for the coagulation is extracted. A mixture with MO and Al-2(SO4)(3) in a 20:80 proportion showed the best results, with 97.5% of the turbidity removed at 60 min. of sedimentation, allowing the treated water to be used for washing vehicles and flushing toilets. The FeCl3 treatment produced a high concentration of chlorides, which could cause corrosion problems, and is therefore not recommended for concrete wastewater treatment.381576

Monitoreo de la Calidad de Energía Eléctrica Mediante un Análisis Estadístico Multivariado

Este trabajo introduce una metodología basada en análisis estadístico multivariado para el monitoreo de la calidad de la energía eléctrica. Se aplican técnicas estadísticas afianzadas, tales como análisis de componentes principales (PCA) y factores de correlaciones entre variables, para encontrar relaciones e indicadores subyacentes en los datos obtenidos por mediciones de variables relacionadas con la calidad de energía eléctrica. A los efectos del presente trabajo, los datos se obtuvieron a lo largo de 6 campañas de medición reales. La motivación y originalidad de la metodología propuesta radica en la búsqueda de un nuevo enfoque que permita cuantificar y calificar de modo sistemático a la calidad de energía de un usuario en base a mediciones tradicionales de la calidad del suministro. Si bien los resultados son aún preliminares, se considera que la metodología propuesta es viable y promisoria