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Chapter 26: Q33P (page 749)

State three different methods to reduce electroosmotic flow. Why does the direction of electroosmotic flow change when a silica capillary is washed with a cationic surfactant?

Short Answer

Expert verified

Three methods are- (I) lowering the pH (2) adding cations(3) covalently attaching silanes

Step by step solution

01

Define Electroosmotic flow.

It is a motion of flow of liquid which is induced by applied potential across the porous membrane

02

Methods required.

Electroosmotic flow can be reduced by the following methods:
(1) lowering the which causes the reduction of electric charge on the capillary wall.
(2) adding some cations that will stick to the capillary wall and neutralize its charge.
(3) covalently attaching silanes, which are strong reducing agents, on the capillary walls

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