A magnetic stirrer is a laboratory equipment that uses the force of the magnetic field produced by a magnet, which generates a vortex in the solutions with the help of a magnetic bar, at the rate of the rotating magnetic field. In many cases, a shaker is essential for laboratory research and testing that requires mixing, shaking, or pooling solutions.
How is a magnetic stirrer made?
This electromechanical equipment is constituted by an electric motor, usually there are agitators with ranges between 100 to 1500 rpm, existing in the same way of greater ranges.
In order to maintain the speed range (rpm), it has an electronic sensor, which measures the rotary movement and allows the user to adjust it as necessary. The motor is provided with a magnet on the shaft that allows controlling the ferromagnetic bar that is immersed in the solution to be stirred, this ferromagnetic bar is covered with an inert material (usually Teflon) so that it cannot alter the solution in which it is. submerged. Some models of agitators do not have moving parts, which makes them much more durable, as they do not show friction wear on the moving parts it may contain.
The most common agitators are motorized ones and are designed so that they can withstand long hours of use, in case of requiring replacement or maintenance it does not symbolize a greater expense compared to the usefulness they represent in the laboratory. Additionally, heated stirrers are also offered and are used in thermal applications where a temperature is determined while the solution is stirred.
Also, this type of equipment is achieved in multi-station presentation, which have the option of shaking different solutions at the same time and at different speeds. These are quite useful in laboratories that require maximum performance in production and optimization of space. Example, a four-post shaker takes up less space than four would.
What is agitation?
It is convenient first to establish the difference between agitation and mixing; the word mix, directly expresses the union, the incorporation of one thing with another; on the other hand, the word agitation goes towards the effect of shaking, violently moving or moving an object with a certain frequency. In addition, the effect produced by the stirring movement, in the test solution or substance, is to increase the amount of oxygen that it receives, since through the rotary movement it generates a vortex inside the flask, achieving that most of the Substances in the solution receive a greater volume of atmospheric oxygen and nutrients present in the environment. In this way, an environment conducive to the cultivation of aerobic microorganisms is obtained; for this case, the agitation also allows the microorganism to maintain almost total contact with the exquisite nutrient components of the culture medium.