Question

A membrane is being engineered for filtering proteins. Its pores have charged surfaces, so some of the sieving effect of the membrane comes from the electrostatic repulsion of the proteins from the walls of the pore. Consider the membrane pore to be a parallel slit 10 nm in width, and the surface potential to be 50 mV. Assume the potential at the midplane to be low, and calculate it for the case of 15 mM ionic strength (coming from a monovalent electrolyte).

Answer 1