Osmosis in negatively charged nanocapillaries and its enhancement by anionic surface-active agent”

01.11.2018 – FLNR CAP and Sector N7 Scientific Seminar “Osmosis in negatively charged nanocapillaries and its enhancement by anionic surface-active agent”, 11-00, Flerov Lab Conference Hall.

Speaker: Yu.Yamauchi

Osmotic flows through track membranes of 10-50 nm pore radius in water/membrane/salt solution system at the latter concentration order of several mmol/l are measured. It is found that water transport through the pores is intensive only if the solute dissociates into ions (KCl, K2SO4, sodium dodecyl sulfate). Molecules of low-molecular nonelectrolytes almost don’t induce osmotic flow under given capillary radii which points out the essential role of double electric layer in the mechanism of osmotic transport.


It was shown that osmotic pressure transport through pores is of convectional nature: Poiseuille’s law for viscous flow through cylindric capillary works.


Osmotic pressure values at different salt concentrations are determined and reflection coefficients are calculated. Sorption of anionic surface active agent increases membrane surface charge and enhances osmotic effect.