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Electrical Characterisation

Magnetic Stirrer

A  magnetic stirrer  or  magnetic mixer  is a laboratory device that employs a rotating magnetic field to cause a  stir bar  (or  flea ) immersed in a liquid to spin very quickly, thus stirring it. The rotating field may be created either by a rotating  magnet  or a set of stationary electromagnets, placed beneath the vessel with the liquid.Magnetic stirrers are often used in  chemistry  and  biology , where they can be used inside hermetically closed vessels or systems, without the need for complicated rotary seals. They are preferred over gear-driven motorized stirrers because they are quieter, more efficient, and have no moving external parts to break or wear out (other than the simple bar magnet itself). Magnetic stir bars work well in  glass  vessels commonly used for chemical reactions, as glass does not appreciably affect a  magnetic field . The limited size of the bar means that magnetic stirrers can only be used for relatively small experiments, of 4 liters or less. Stir bars also have difficulty in dealing with  viscous  liquids or thick suspensions. For larger volumes or more viscous liquids, some sort of mechanical stirring is typically needed.

Various tests performed


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