Spatially-resolved measurements of molecular transport in solution across porous membranes using scanning electrochemical microscopy (SECM) provides a means to identify microscopic structures in a membrane that are associated with molecular transport paths and mechanisms.Absolute values of the rate of transport of a molecule through an individual pore can be directly measured by SECM,and "images of molecular flux"across a porous membrane are now being routinely obtained with micrometer and submicrometer resolution. This capability has been especially useful in characterizing transport across biological membranes,where the molecular flux varies significantly as a function of spatial position.
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