distance

1
The electrical double layer
Diffuse Layer
Bulk Solution
IHP
OHP
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fd
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Potential
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fi

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distance
2
z zeta potential k liquid conductivity m
viscosity e liquid permittivity DP pressure
difference from inlet to outlet fs measured
streaming potential
3

• z zeta potential
• k liquid conductivity
• n kinematic viscosity
• liquid permittivity
• a disk radius
• z distance of reference electrode from sample
• rotation rate
• fs measured streaming potential

4
The plane of shear
Diffuse Layer
Bulk Solution
IHP
OHP
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fd

z
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Potential

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distance
Plane of shear (possibly)
5
A schematic of the parallel plate capillary
system.
voltmeter
Sample solid Liquid Reference electrode (e.g.
Ag/AgCl)
piston/pump
receptacle
6
Schematic of the rotating disk system
voltmeter
7
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8
z zeta potential R gas law constant T
temperature z 1, for a 11 salt F faradays
constant l Debye length q2charge density of the
diffuse layer e permittivity of water
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10
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11
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12
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