Slippage of the aqueous solutions of cetyltrimethylammonium bromide duringflow in thin quartz capillaries

The viscosity of cetyltrimethylammonium bromide (CTAB) solutions was measur ed in thin (micron-sized) quartz capillaries as their surface was hydrophob ized as a result of adsorption of the CTA(+) ions from a solution. At a con centration of a 10(-4) M CTAB solution, corresponding to monolayer formatio n, an increase in the solution flow rate was discovered, which may be inter preted as slippage of the aqueous CTAB solution over the capillary surface. The measured value of the coefficient of slippage, which is equal to 10(-5 ) m(3)/N s, is close to that obtained earlier for the methylated quartz sur face.