Charge movement law

Charge movement law
Electrophoresis can be used to determine the electrical properties of colloidal particles. The colloidal particles moving towards the anode have a negative charge, and the colloidal particles moving towards the cathode have a positive charge.
Generally speaking, colloidal particles such as metal hydroxide and metal oxide adsorb cations and are positively charged; Colloidal particles such as non-metallic oxides and sulfides adsorb anions and carry negative charges.
Therefore, in the electrophoretic experiment, the colloidal particles of iron hydroxide move towards the cathode, and the colloidal particles of arsenic disulfide move towards the anode. Electrophoresis can be used to separate sols with different charges.
For example, clay used in the ceramic industry often contains iron oxide. To remove iron oxide, the clay and water can be stirred together to form a suspension. Due to the negative charge on the clay particles and the positive charge on the iron oxide particles, a very pure clay will accumulate near the anode after being electrified. Electrophoresis is also used for factory dust removal. Electrophoresis can also be used to detect isolated substances, which plays an important role in biochemical and clinical diagnosis. From the late 1940s to the early 1950s, electrophoresis using support materials was successively developed, such as filter paper electrophoresis, cellulose acetate membrane electrophoresis, and agar electrophoresis; In the late 1950s, starch gel electrophoresis and polyacrylamide gel electrophoresis appeared again.

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