Browsing by Author "East, G. A."
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- ItemNucleation and growth mechanisms during electropolymerization of substituted 3-alkylthiophenes(ELSEVIER, 2008) Soto, J. P.; Diaz, F. R.; del Valle, M. A.; Velez, J. H.; East, G. A.In the present work the electrochemical study of compounds based on 3-((omega-bromoalkyloxy) methyl) thiophene, varying the length of the alkyl chain between 6 and 12 carbon atoms, is reported. Electropolymerization of the monomers was achieved by potentiodynamic (cyclic voltammetry, CV) and potentiostatic (constant potential) techniques. Voltammograms obtained by CV show that all monomers can be electrochemically oxidized at potentials about 1800 mV to synthesize the respective polymer. Besides, the potential shifts to more anodic potentials on successive scans, increasing thus the resistivity of the material. Nucleation and growth mechanism (NGM) of electropolymerization was investigated by a potentiostatic technique (j-t). Deconvolution of the current-time transient data fitted with a theoretical model suggests that at short times the instantaneous nucleation with two-dimensional growth (IN2D) contribution prevails, followed by an instantaneous nucleation with three-dimensional growth controlled by the charge transfer (IN3Dct) contribution and, finally at longer times, the instantaneous nucleation with three-dimensional growth controlled by diffusion (IN3Ddif) contribution becomes important. The predominance of each contribution to the NGM depends on the monomer being electropolymerized, and the electrolysis time. The morphology predicted from these NGMs fully correlates with that determined by SEM. (C) 2007 Elsevier B.V. All rights reserved.
- ItemSynthesis and characterization of poly(pyridylurea) and poly(pyridylthiourea), potentially semiconducting polymers(2007) Díaz Alzamora, Fernando Raúl; Godoy, A.; Moreno, J.; Bernède, Jean Christian; Valle Delaware la Cortina, María Angélica del; Tagle Domínguez, Luis Hernán; East, G. A.
- ItemSynthesis of 3 ',4 '-disubstituted terthiophenes. Characterization and electropolymerization. I. 3 ',4 '-Dibromo-2,2 ': 5 ',2 ''-terthiophene in photovoltaic display(2006) Vélez, Jorge H.; Díaz Alzamora, Fernando Raúl; Valle Delaware la Cortina, María Angélica del; Bernède, Jean Christian; East, G. A.
- ItemSynthesis, characterization and electrical properties of polyimines derived from selenophene(1999) Díaz Alzamora, Fernando Raúl; Moreno Cortes, Jeannette del Pilar; Tagle Domínguez, Luis Hernán; East, G. A.; Radić Foschino, Deodato D.
- ItemSynthesis, characterization and polymerization of thiophene units anchored with an imine-type mesogen group(2007) Soto, J. P.; Valle de la Cortina, María Angélica del; Díaz Alzamora, Fernando Raúl; Vélez, J. H.; East, G. A.
- ItemSynthesis, characterization and properties of polythiophenes modified with mesogenic group spacers with different chain lenghts(2005) Díaz Alzamora, Fernando Raúl; Soto, J. P.; Valle de la Cortina, María Angélica del; East, G. A.; Bernède, Jean Christian