Osmosis, filtration and beyond
(Image credits: Jalene Lu) Osmosis is a universal phenomenon occurring in q broqd vqriety of processes. It is both trivial in its fundamental expression, yet highly subtle in its physical roots. Pushing the fundqmentql understqnding of osmosis, it is possible to explore new perspectives in a variety of fields, and find applications where advanced osmotic processes show great promises.
Active sieving and separation of particles
In Nature, exceptional permeability and selectivity properties are reached in ion channels. The paradigm change as compared to nanoscale technology is that these biological filters are out-of-equilibrium, submitted to either thermal or active fluctuations – for example of the pore constriction. We investigated how out-of-equilibrium fluctuations of a pore affects translocation dynamics, and found regimes of enhanced selectivity and transport. These results open up the possibility that transport across membranes can be actively tuned by external stimuli, with potential applications to nanoscale pumping, osmosis and dynamical ultrafiltration.