TY - JOUR AB - Biodiesel fuels were prepared front different vegetable oil sources (canola, soybean, sunflower, and corn) and studied through electrochemical impedance spectroscopy. The dielectric constant from these biofuels evidenced no important dependence on feedstock, suggesting basically no change in fuels' polarity from varying the raw materials. In a different way, huge variations of the electrical resistivity and relaxation frequency were found when comparing among the studied biodiesels. Our findings demonstrate that these variations are Closely associated with changes in the biodiesel viscosity, which is known to modulate charge mobility and was feedstock dependent. Accordingly, the impedance spectroscopy is here revealed to be a sensitive, alternative and reliable analytical approach for distinguishing among different feedstock-related biodiesels and monitoring certain biofuels' properties, like viscosity and interrelated parameters, usually connected with fatty acid structural profiles in biodiesel fuels. Copyright (C) 2013, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved. AD - Univ Sao Paulo, Inst Fis Sao Carlos, Grp Crescimento Cristais & Mat Ceram, BR-13560970 Sao Carlos, SP, Brazil AN - WOS:000322562800033 AU - M'Peko, J. C. AU - Reis, D. L. S. AU - De Souza, J. E. AU - Caires, A. R. L. DA - Jul 26 DO - 10.1016/j.ijhydene.2013.05.086 IS - 22 J2 - Int J Hydrogen Energ KW - biodiesel LA - English N1 - 193mb PY - 2013 SN - 0360-3199 SP - 9355-9359 ST - Evaluation of the dielectric properties of biodiesel fuels produced from different vegetable oil feedstocks through electrochemical impedance spectroscopy T2 - International Journal of Hydrogen Energy TI - Evaluation of the dielectric properties of biodiesel fuels produced from different vegetable oil feedstocks through electrochemical impedance spectroscopy UR - ://WOS:000322562800033 VL - 38 ID - 9066 ER -