Physics:Electroviscous effects
Electroviscous effects, in chemistry of colloids and surface chemistry, according to an IUPAC definition,[1] are the effects of the particle surface charge on viscosity of a fluid.
Viscoelectric is an effect by which an electric field near a charged interface influences the structure of the surrounding fluid and affects the viscosity of the fluid.[2]
Kinematic viscosity of a fluid, η, can be expressed as a function of electric potential gradient (electric field), [math]\displaystyle{ \vec E }[/math], by an equation in the form:
[math]\displaystyle{ \eta=\eta_0 \left(1+ f\, \lVert {\vec{E}}\rVert^{2}\right) }[/math]
where f is the viscoelectric coefficient of the fluid.
The value of f for water (ambient temperature) has been estimated to be (0.5–1.0) × 10−15 V−2 m2.[3]
See also
References
- ↑ IUPAC, Compendium of Chemical Terminology, 2nd ed. (the "Gold Book") (1997). Online corrected version: (2006–) "electroviscous effects". doi:10.1351/goldbook.E02030
- ↑ Vincent A. Hackley, Chiara F. Ferraris, "The Use of Nomenclature in Dispersion Science and Technology", NIST Recommended Practice Guide, NIST, Special Publication 960-3, 2001.
- ↑ Robert J. Hunter and J. V. Leyendekkers, "Viscoelectric coefficient for water", J. Chem. Soc., Faraday Trans. 1, 1978, 74, 450-455.
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