SCANNING ELECTROCHEMICAL MICROSCOPY AS A PROBE OF LOCAL FLUID-FLOW THROUGH POROUS SOLIDS - APPLICATION TO THE MEASUREMENT OF CONVECTIVE RATES THROUGH A SINGLE DENTINAL TUBULE
Jv. Macpherson et al., SCANNING ELECTROCHEMICAL MICROSCOPY AS A PROBE OF LOCAL FLUID-FLOW THROUGH POROUS SOLIDS - APPLICATION TO THE MEASUREMENT OF CONVECTIVE RATES THROUGH A SINGLE DENTINAL TUBULE, Journal of the Chemical Society. Faraday transactions, 91(9), 1995, pp. 1407-1410
Citations number
35
Categorie Soggetti
Chemistry Physical","Physics, Atomic, Molecular & Chemical
Scanning electrochemical microscopy (SECM) is shown to be a powerful t
echnique for imaging the rate of fluid flow through porous solids. Usi
ng a dentine slice (containing tubules of ca. 2 mu m diameter) as an e
xample, local fluid flow rates and topography of the sample are sequen
tially mapped in situ by monitoring the transport-limited current for
the electrolysis of a target mediator (oxidation of aqueous hexacyanof
errate(ll) as a function of tip position, with and without an applied
fluid pressure. It is demonstrated, for the first time, that: (i) rate
s of fluid flow through dentine vary dramatically at the microscopic l
evel and (ii) the flow rate through a single tubule can be quantified.