What we conclude if we have positive or negative viscosity deviation?
For example : attraction, repulsion, dispersive forces, strong or weak interaction, etc.
Dear Nada,
if there are entities that may exhibit intermolecular hydrogen bonds in the systems under study, a negative deviation can be interpreted as bond breakage and the viscosity of the mixture is lower than that of the pure components. Then a positive deviation is evidence of bonding
Firstly, may I not exactly understand the subject matte, but maybe it's the effects of positive and negative hydration. And secondly, I'm not sure that this can be attributed to any system.
Dear Nada,
if there are entities that may exhibit intermolecular hydrogen bonds in the systems under study, a negative deviation can be interpreted as bond breakage and the viscosity of the mixture is lower than that of the pure components. Then a positive deviation is evidence of bonding
If with a binary liquid mixture is meant a homogeneous mixture of two liquids it is probably easier to study the total volume (or inversely the density) to see how the molecules interact (Vtotal < Va + Vb attraction and Vtotal > Va + Vb repulsion). But in any case repulsion of the two liquids could quickly result in demixing, although not necessarily depending on the nature of molecules, their size (difference) also plays a role.
With viscosity it would be more complicated, first of all is the viscosity Newtonian, is there shear thinning or thickening. A lot depends on the nature and size of the different constituents
there are many reason for positive deviation in viscosity, generally if our binary components having no much different in viscosity in pure state. so positive deviation indicate interactions between binary component. but some type this deviation can also be negative depending upon our binary component.
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