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Electrochemical applications of electrolytes based on ionic liquids
Neto, M. J.; Leones, R.; Sentanin, F.; Esperança, J.; Medeiros, Maria José; Pawlicka, A.; Silva, Maria ManuelaThe potential utility of room temperature ionic liquids as electrolytes in current electrochemical applications has been explored. Hence, the electrochemical behavior of [Ni(tmc)]Br2 complex at a glassy carbon electrode in the absence or in the presence of unsaturated halides in the ionic liquids, 1-ethyl-3- methylimidazolium ethylsulfate, [C2mim][C2SO4] and N,N,Ntrimethyl- N-(2-hydroxyethyl) ammonium bis(trifl...
Electrochromic Properties of Sol-gel Coating of Nb2O5 and Nb2O5:Li+
Melo,L.; Avellaneda,C.O.; Caram,R.; Sichieri,E.; Pawlicka,A.Thin solid films of Nb2O5 and Nb2O5:Li+ were prepared by the sol-gel process using the sonocatalytic method. The films reported here were prepared from a NbCl5 as precursor and butanol as solvent. Through the addition of lithium salt LiCF3SO3 to the precursor solution, films with different electrochemical performance were obtained. The electrochemical and optical responses of the films were determined from the ...
Preparation and characterization of starch grafted with toluene poly (propylene...
Dragunski,D.C.; Pawlicka,A.Amylopectin-rich starch samples (Amidex 4001 Corn Products Brasil Ingredientes Industriais Ltda.) were grafted with polyethers with the purpose of obtaining new materials for application as solid polymeric electrolytes. Grafting reaction was performed by the addition of starch dissolved in DMSO to toluene poly(propylene oxide) diisocyanate (Resibras) dissolved in the same solvent. This reaction produced a film ...
Caracterização de filmes finos de Nb2O5 com propriedades eletrocrômicas
Avellaneda,C. O.; Aegerter,M. A.; Pawlicka,A.The sols for thin electrochromic coatings of Nb2O5 were obtained by synthesis of the niobium butoxide from BuONa and NbCl5. The ~300nm thick films were deposited by dip-coating technique from the alkoxide solution and calcined at 560ºC in O2 atmosphere during 3 hours. The particles size of niobium oxide (V) powder (~20mm) was obtained from x-ray diffraction using the Scherrer equation. The coatings were charact...
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