Switchable viscosity triggered by CO2 using smart worm-like micelles

We report two CO2-responsive aqueous solutions having switchable viscosity. The solution of sodium octadecyl sulfate and 2-(dimethylamino)ethanol forms viscoelastic worm-like micelles in the presence of CO2 but not in its absence at 60 degrees C. Another solution of sodium stearate and sodium nitrate has high viscosity only if CO2 is absent.