SCHEDULED MAINTENANCE
Scanning electrochemical microscopy as a probe of local fluid flow through porous solids
Abstract
Scanning electrochemical microscopy (SECM) is shown to be a powerful technique for imaging the rate of fluid flow through porous solids. Using a dentine slice (containing tubules of ca. 2 µm diameter) as an example, local fluid flow rates and topography of the sample are sequentially mapped in situ by monitoring the transportlimited current for the electrolysis of a target mediator (oxidation of aqueous hexacyanoferrate(II) as a function of tip position, with and without an applied fluid pressure. It is demonstrated, for the first time, that: (i) rates of fluid flow through dentine vary dramatically at the microscopic level and (ii) the flow rate through a single tubule can be quantified.
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