Chemical Sensing and Chemoresponsive Pumping with Conical-Pore Polymeric Membranes

Chemical Sensing and Chemoresponsive Pumping with Conical-Pore Polymeric Membranes

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Synthetic membranes containing asymmetrically shaped pores have been shown to rectify the ionic current flowing through the membrane.Ion-current rectification means that such membranes produce nonlinear current−voltage curves analogous to those observed TEIN EDFC Motor Kit EDK05-12120 303338 with solid-state diode rectifiers.In order to observe this ion-current rectification phenomenon, the asymmetrically shaped pores must have pore-wall surface charge.Pore-wall surface charge also allows for electroosmotic flow (EOF) to occur through the membrane.

We have shown that, because ion-current is rectified, EOF is likewise rectified in such membranes.This means that flow through the membrane depends on the polarity of the voltage applied across the membrane, one polarity producing a higher, and the opposite producing a lower, flow rate.As is reviewed here, these ion-current and EOF rectification phenomena are being used to develop new sensing technologies.Results obtained from an ion-current-based sensor for hydrophobic cations are reviewed.

In addition, ion-current and EOF rectification can be combined to Hockey Accessories - Bags - Wheel make a new type of device—a chemoresponsive nanofluidic pump.This is a pump that either turns flow on or turns flow off, when a specific chemical species is detected.Results from a prototype Pb2+ chemoresponsive pump are also reviewed here.