%0 Book Section %1 statphys23_0981 %A Toumi, A. %A Bouanz, M. %B Abstract Book of the XXIII IUPAP International Conference on Statistical Physics %C Genova, Italy %D 2007 %E Pietronero, Luciano %E Loreto, Vittorio %E Zapperi, Stefano %K critical density impurity index ionic liquids phenomena refractive shear statphys23 topic-2 viscosity %T Refractive index, Mass Density and Shear Viscosity near the Liquid-Liquid Critical Point of a mixture with an ionic impurity %U http://st23.statphys23.org/webservices/abstract/preview_pop.php?ID_PAPER=981 %X We have investigated the (K+, Cl-) ions effect on the refractive index (n), on the mass density ($\rho$) and on the shear viscosity ($\eta$) in the homogeneous phase above the higher critical solution point in critical-composition liquid mixture isobutyric acid + water (I-W). For the pure critical system (I-W), both critical exponents ($\alpha$) and $y$, respectively obtained by the techniques of density ($\rho$) and refractive index (n) on the one hand, and by shear viscosity ($\eta$) on the other hand, agree well with (d = 3)-dimensional Ising value established not only by renormalisation group (RG) calculation, but also by extensive high-T series expansions and Monte Carlo simulations. Concerning the exponent , with (K+, Cl-) ions at weak concentrations, the critical mixture (I-W) exhibits critical behaviour in favour of Ising critical exponent asymptotically close to the critical point. However, the critical exponent y value connected to the critical anomaly of shear viscosity is found smaller than the one predicted by dynamic renormalisazation group and mode-coupling theories. Furthermore, the decrease of the critical amplitude of the viscosity caused by the ionic impurity is attributed to the strengthening of the solute-solvent interaction which causes the increase of the water-solute clusters.

@incollection{statphys23_0981, abstract = {We have investigated the (K+, Cl-) ions effect on the refractive index (n), on the mass density ($\rho$) and on the shear viscosity ($\eta$) in the homogeneous phase above the higher critical solution point in critical-composition liquid mixture isobutyric acid + water (I-W). For the pure critical system (I-W), both critical exponents ($\alpha$) and $y$, respectively obtained by the techniques of density ($\rho$) and refractive index (n) on the one hand, and by shear viscosity ($\eta$) on the other hand, agree well with (d = 3)-dimensional Ising value established not only by renormalisation group (RG) calculation, but also by extensive high-T series expansions and Monte Carlo simulations. Concerning the exponent , with (K+, Cl-) ions at weak concentrations, the critical mixture (I-W) exhibits critical behaviour in favour of Ising critical exponent asymptotically close to the critical point. However, the critical exponent y value connected to the critical anomaly of shear viscosity is found smaller than the one predicted by dynamic renormalisazation group and mode-coupling theories. Furthermore, the decrease of the critical amplitude of the viscosity caused by the ionic impurity is attributed to the strengthening of the solute-solvent interaction which causes the increase of the water-solute clusters.}, added-at = {2007-06-20T10:16:09.000+0200}, address = {Genova, Italy}, author = {Toumi, A. and Bouanz, M.}, biburl = {https://www.bibsonomy.org/bibtex/2f675eed6a45988a99a6e0fd4dc01348a/statphys23}, booktitle = {Abstract Book of the XXIII IUPAP International Conference on Statistical Physics}, editor = {Pietronero, Luciano and Loreto, Vittorio and Zapperi, Stefano}, interhash = {f7e8cc021863a9706d96ec47dc499a2c}, intrahash = {f675eed6a45988a99a6e0fd4dc01348a}, keywords = {critical density impurity index ionic liquids phenomena refractive shear statphys23 topic-2 viscosity}, month = {9-13 July}, timestamp = {2007-06-20T10:16:36.000+0200}, title = {Refractive index, Mass Density and Shear Viscosity near the Liquid-Liquid Critical Point of a mixture with an ionic impurity}, url = {http://st23.statphys23.org/webservices/abstract/preview_pop.php?ID_PAPER=981}, year = 2007 }