The electrical double layer. Diffuse Layer. Bulk Solution. IHP. OHP. . +. . +. +. f d. . Potential. . +. +. . . . +. +. +. +. . f i. +. . . . . +. +. . +. +. . distance. z : zeta potential k : liquid conductivity m : viscosity
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The electrical double layer
Diffuse Layer
Bulk Solution
IHP
OHP

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fd

Potential

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fi
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distance
z: zeta potential
k : liquid conductivity
m: viscosity
e : liquid permittivity
DP: pressure difference from inlet to outlet
fs: measured streaming potential
a: disk radius
z: distance of reference electrode from sample
fs: measured streaming potential
The plane of shear
Diffuse Layer
Bulk Solution
IHP
OHP

fd
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z

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Potential
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distance
Plane of shear
(possibly)
A schematic of the parallel plate capillary system.
voltmeter
Sample solid
Liquid
Reference electrode (e.g. Ag/AgCl)
piston/pump
receptacle
Liquid
Reference electrode
Sample solid
Schematic of the rotating disk system
voltmeter
z: zeta potential
R: gas law constant
T: temperature
z: 1, for a 1:1 salt
F: faraday’s constant
l: Debye length
q2:charge density of the diffuse layer
e: permittivity of water