 Uniform wall charge and polymer entry scaling

A homogeneous charged channel can add a constant electro-osmotic drift to the ideal electrophoretic velocity at fixed field. It changes the coefficient of a linear length-versus-entry-time law without generating a new length exponent. Charge-dependent adsorption, heterogeneous trapping or cancellation of drift followed by diffusion lies outside that simple claim; wall charge cannot be excluded as an indirect cause in every real experiment.