Electroosmotic velocities of buffered solutions are shown for a bare silica capillary and one with aminopropyl groups

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Electroosmotic velocities of buffered solutions are shown for a bare silica capillary and one with aminopropyl groups (silica - Si - CH2CH2CH2NH2) covalently attached to the wall. A positive sign means that flow is toward the cathode. Explain the signs and relative magnitudes of the velocities.

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