Is there any data sheet available for viscosity for SDS-water mixture at room temperature? If not, how much variation can be expected in increase in viscosity of solution of 10mM of SDS is added to water?
I guess by 'viscosity' here you mean dynamic viscosity. If so, the dynamic viscosity of pure water is about 8.90 × 10−4 Pascal second at 25 °C. 10mM SDS concentration means that in such aqueous solution, SDS micelles are already formed. Thus, since viscosity is a measure of resistance to flow, there will be an increase in the viscosity of water due to the formation of aggregates or micelles above SDS CMC (~8.0mM) but by how much this variation will be should perhaps be determined experimentally.
I don't have my own measurement for neat SDS, but I can offer an "order of magnitude:"
In aqueous 0.075%wt PEO (just above the coil-overlap concentration), the zero-shear viscosity of 10mM SDS is 4 mPa s. The neat PEO solution in this case, with no SDS has a zero-shear viscosity of 1.52 mPa s.
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