Centro de Investigación y Desarrollo Tecnológico en Electroquímica

About: Centro de Investigación y Desarrollo Tecnológico en Electroquímica is a based out in . It is known for research contribution in the topics: Cyclic voltammetry & Catalysis. The organization has 537 authors who have published 682 publications receiving 10382 citations. The organization is also known as: Centro de Investigacion y Desarrollo Tecnologico en Electroquimica & Center of Research and Technologic Development in Electrochemistry.

Site-Specific Description of the Enhanced Recognition Between Electrogenerated Nitrobenzene Anions and Dihomooxacalix[4]arene Bidentate Ureas.

Abstract: Electron transfer controlled hydrogen bonding was studied for a series of nitrobenzene derivative radical anions, working as large guest anions, and substituted ureas, including dihomooxacalix[4]arene bidentate urea derivatives, in order to estimate binding constants (Kb) for the hydrogen-bonding process. Results showed enhanced Kb values for the interaction with phenyl-substituted bidentate urea, which is significantly larger than for the remaining compounds, e.g., in the case of 4-methoxynitrobenzene a 28-fold larger Kb value was obtained for the urea bearing a phenyl (Kb ∼ 6888) vs tert-butyl (Kb ∼ 247) moieties. The respective nucleophilic and electrophilic characters of the participant anion radical and urea hosts were parametrized with global and local electrodonating (ω–) and electroaccepting (ω+) powers, derived from DFT calculations. ω– data were useful for describing trends in structure–activity relationships when comparing nitrobenzene radical anions. However, ω+ for the host urea structures le...

Effect of fly ash and hemihydrate gypsum on the properties of unfired compressed clay bricks

Abstract: The effect of fly ash type F and hemihydrate gypsum on the mechanical and thermal properties of unfired compressed clay bricks (UCSB) using a semi-dry mixture was determined. UCSB were molded from two different semi-dry mixtures, the bricks made with dark-brown soil + sand + chemical additives were labeled as DBS-LG while the other bricks made with the mixture dark-brown soil + sand + fly ash + chemical additives were labeled as DBS-FALG. SEM and XRD were used to investigate microstructure and mineralogical composition, respectively. Results showed that the addition of fly ash and hemihydrate gypsum improves the mechanical properties of UCSB compared to those of a clay-polymers system; thermal conductivity was similar to other clay based bricks. These results reinforce the suitability of these mixtures in low cost building bricks with energy conservation. Key words: Carbon footprint, Earth construction, unfired clay bricks, fly ash.