The electrical double layer
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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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Distance

The electrical double layer

Diffuse Layer

Bulk Solution

IHP

OHP

-

+

-

+

+

fd

-

Potential

-

+

+

-

-

-

+

+

+

+

-

fi

+

-

-

-

-

+

+

-

+

+

-

distance


Distance

z: zeta potential

k : liquid conductivity

m: viscosity

e : liquid permittivity

DP: pressure difference from inlet to outlet

fs: measured streaming potential


Distance

  • 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


Distance

The plane of shear

Diffuse Layer

Bulk Solution

IHP

OHP

-

fd

+

z

-

+

+

-

Potential

+

-

-

+

-

+

+

+

-

+

-

-

-

+

-

-

+

+

+

-

-

+

distance

Plane of shear

(possibly)


Distance

A schematic of the parallel plate capillary system.

voltmeter

Sample solid

Liquid

Reference electrode (e.g. Ag/AgCl)

piston/pump

receptacle


Distance

Liquid

Reference electrode

Sample solid

Schematic of the rotating disk system

voltmeter


Distance

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


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