Fig nbsp xA Dependences of dynamic viscosity vs shear rate
Fig. 1. Isotherms of conductivity (κ) of BMImBr–CuBr2 ionic liquid.Figure optionsDownload full-size imageDownload high-quality image (211 K)Download as PowerPoint slide
The temperature dependences of specific conductivity of BMImBr–CuBr2 ionic liquids obey the classical Arrhenius equation (Eq. (1)) as opposed to the majority of metal containing ionic liquids , including BMImBr–AgBr one which was studied by us earlier .equation(1)κ=Ae‐EκRT,where A is a constant, Еκ is the effective activation AM-095 free base of conductivity, R is the gas constant, and T is the temperature, K.
The effective activation energies of conductivity Еκ for BMImBr–CuBr2 blends are listed in Table 1. Their high magnitudes indicate strong interaction between BMImBr and CuBr2.
The dynamic viscosity η (Pa s) of the BMImBr–CuBr2 system at 293 K varied not steadily when C (CuBr2) increased, so η values were equal to 1.53, 1.25, and 1.34 Pa s at 0, 0.4, and 1.2 mol kg− 1 BMImBr, respectively. Apparently, a negligible addition of inorganic salt to the ionic liquid resulted in the destruction of the pseudo-polymer structure of ionic and molecular associates . The influence of shear rate on dynamic viscosity of the blends under investigation is mycelium presented in Fig. 2. Both pure BMImBr ionic liquid and BMImBr–CuBr2 blend exhibit the features of non-Newtonian liquids for which the dynamic viscosity depends on the shear rate owing to formation of complex intermolecular structures . Apparently, at C (CuBr2) > 0.4 mol kg− 1 BMImBr the spatial deformation-resistant structure forms.