Theoretically consistent calculation of viscous activation parameters through the Eyring equation and their interpretation

resumo

The activation parameters of viscous flow can be used to probe the molecular interactions in fluids from viscosity experimental data. They are assessed by mathematical derivations of the Eyring equation, but differences in these derivations can generate parameters that lead to conflicting interpretations. In this work, a new method for the estimation of the activation parameters of viscous flow is proposed and compared with two other methods previously reported in the literature. It is shown that the new method is the only presenting theoretically consistent trends, as confirmed by its application to alkanes and ionic liquids. (C) 2020 Elsevier B.V. All rights reserved.

palavras-chave

VISCOSITY B-COEFFICIENTS; IONIC LIQUIDS; RHEOLOGICAL PROPERTIES; PRESSURE-DEPENDENCE; HEXANEDIOIC ACID; BINARY-MIXTURES; FLOW; DENSITY; TEMPERATURE; PREDICTION

categoria

Thermodynamics; Chemistry; Engineering

autores

dos Santos, LJ; Espinoza-Velasquez, LA; Coutinho, JAP; Monteiro, S

nossos autores

agradecimentos

N The authors acknowledge CNPq (421852/2018-6), FAPDF (224/2019, 0193.001523/2016) and FAPESP (2014/21252-0) for financial support. This study was financed in part by the Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior -Brasil (CAPES) Finance Code 001. This work was partly developed within the scope of the projects CICECO-Aveiro Institute of Materials, UIDB/50011/2020 & UIDP/50011/2020, financed by national funds through the Portuguese Foundation for Science and Technology/MCTES, and when appropriate co-financed by FEDER under the PT2020 Partnership Agreement.

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