caa a22 4500 475763882 CHVBK 20180406123559.0 cr unu---uuuuu 170329e20000701xx s 000 0 eng 10.1007/s003960000299 doi (NATIONALLICENCE)springer-10.1007/s003960000299 The electroviscous effect in ethylcellulose latex suspensions. Effect of ionic strength and correlation between theory and experiments [Elektronische Daten] [D. Megías-Alguacil, F. J. Arroyo, F. Carrique, A. V. Delgado]  This article describes an experimental and theoretical investigation of the so-called primary electroviscous effect, i.e., the increase in suspension viscosity due to the existence of an electrical double layer around the particles. By measuring the viscosity of ethylcellulose latex suspensions, the electroviscous coefficient, the quantity measuring the effect, was estimated for different concentrations of 1-1 electrolyte in the dispersion medium. These data were compared with the predictions of Watterson and White's model, using the zeta potential of the particles deduced from electrophoretic mobility measurements. It was found that the theory considerably underestimates the effect. In an attempt to improve the agreement between data and predictions, the model was generalized to include the possibility (dynamic Stern layer) that ions in the inner part of the double layer have nonzero mobility. The general theory, however, predicts even lower values of the electroviscous coefficients, thus increasing the separation between calculated and measured electroviscous coefficients. A careful analysis of the ionic concentrations and velocity profiles with and without dynamic Stern layer corrections can account for this fact, but leaves unsolved the problem of the large discrepancies found in the theoretical explanation of the strength of the electroviscous effect. Springer-Verlag Berlin Heidelberg, 2000 Key words Primary electroviscous effect nationallicence Electric double layer nationallicence Dynamic Stern layer nationallicence Megías-Alguacil D. Departamento de Física Aplicada Facultad de Ciencias Universidad de Granada 18071 Granada, Spain e-mail: adelgado@ugr.es Fax: +34-958-243214, ES aut Arroyo F. J. Departamento de Física Aplicada Facultad de Ciencias Universidad de Granada 18071 Granada, Spain e-mail: adelgado@ugr.es Fax: +34-958-243214, ES aut Carrique F. Departamento de Física Aplicada I Facultad de Ciencias Universidad de Málaga 29071 Málaga, Spain, ES aut Delgado A. V. Departamento de Física Aplicada Facultad de Ciencias Universidad de Granada 18071 Granada, Spain e-mail: adelgado@ugr.es Fax: +34-958-243214, ES aut https://doi.org/10.1007/s003960000299 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s003960000299 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Megías-Alguacil D. Departamento de Física Aplicada Facultad de Ciencias Universidad de Granada 18071 Granada, Spain e-mail: adelgado@ugr.es Fax: +34-958-243214, ES aut NATIONALLICENCE 700 1- Arroyo F. J. Departamento de Física Aplicada Facultad de Ciencias Universidad de Granada 18071 Granada, Spain e-mail: adelgado@ugr.es Fax: +34-958-243214, ES aut NATIONALLICENCE 700 1- Carrique F. Departamento de Física Aplicada I Facultad de Ciencias Universidad de Málaga 29071 Málaga, Spain, ES aut NATIONALLICENCE 700 1- Delgado A. V. Departamento de Física Aplicada Facultad de Ciencias Universidad de Granada 18071 Granada, Spain e-mail: adelgado@ugr.es Fax: +34-958-243214, ES aut Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer