Understanding Corrosion in Water Pipelines: A Guide for Pipeline Designers



Last updated: June 8, 2016

What Does Electroendosmosis Mean?

Electroendosmosis is the movement of liquid in a porous material due to an applied electric field. Electroendosmosis is a very effective instrument when treating heterogeneous, silt and clay-rich soil. The phenomenon of electro-osmosis is very useful in chemical separation techniques and buffered solutions.

Electroendosmosis or electro-osmosis can be used for organics removal. It reduces the need for specialized electrodes.

Electroendosmosis is also known as electro-osmosis or electroosmotic flow (EOF).


Corrosionpedia Explains Electroendosmosis

Electroendosmosis is the migration of water (and whatever is contained in the water) through a porous membrane resulting from a potential difference caused by the flow of an electric charge through the membrane.

The liquid transportation rate depends on:

  • The properties of the liquid
  • The properties of the solid(s)
  • The applied potential

Electroendosmosis achieves two benefits when properly applied:

  • It provides uniform pore water movement in most types of soil. The size of the pore is not important. Electro-osmotic flow rate is primarily a function of applied voltage.
  • The electricity applied to the soil directly results in the heating of the soil. The soil warming not only increases the mobilization of volatile organics, but also increases the electro-osmotic permeability by lowering the viscosity of the pore water.

When the electro-osmotic flow of alkaline liquid to a particular sodium carbonate solution such as concrete occurs, it assists in repassivation of the steel and causes realkalization of carbonated concrete.

Electroendosmosis techniques are commonly used in chemical analysis, soil analysis and processing and microfluidic devices. All of these uses involve highly charged surfaces, often of oxides. In capillary electrophoresis, which is another use of electro-osmosis, chemicals are separated according to their electrophoretic mobility by applying an electric field.



Electroosmotic flow



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