What is the purpose of a magnetic stir bar?
A stir bar consists of a magnetic bar used to agitate a liquid mixture or solution (Figure 6.6). Because the glass does not affect a magnetic field significantly, and most of the chemical reactions are performed in glass vials or beakers, stirring bars function adequately in glassware commonly used in laboratories.
What is best way to remove a stir bar from flask?
Place the 2nd bar on the side of the flask next to the one in the flask and have the magnets attract together….
- Go to your nearest giant electromagnet (an NMR or MRI should do the trick)
- Place sample jar near machine.
- Stand well back.
- Turn on magnet, allowing the bar to be gently removed and placed on the floor.
How do you use a magnetic stirrer?
To use the magnetic stirrer: Turn on the magnetic stirrer by flipping the power switch on (–), then rotating the left knob in a clockwise direction. 3. The farther you rotate the knob, the faster it will spin to stir your solution. You can control the stirring speed between about 120 and 1400 rpm.
Why is the iron stirrer covered in plastic?
Mr. Rosinger’s patent includes a description of a coated bar magnet placed in a vessel, which is driven by a rotating magnet in a base below the vessel. Mr. Rosinger also explains in his patent that coating the magnet in plastic or covering it with glass or porcelain makes it chemically inert.
Can you autoclave a stir bar?
Fisherbrand™ Cylindrical PTFE or Glass Stir Bars are autoclavable.
How do you clean Teflon stir bars?
Others are not so thorough—indeed, many chemists clean their stir bars with nothing more than a quick scrub and a rinse with acetone and water, Ananikov says.
What is a magnetic stirring bar?
Fisherbrand™ Magnetic Stirring Bars contain PTFE encapsulated Alnico magnets and come in various sizes. Provide better mixing at bottom of vessel with less splashing. Generate over three times the torque of conventional stirring bars with these komet stir bars, significantly enhancing stirrer performance and versatility.
What are K&J stir bar magnets?
The K&J stir bar magnets included a molded layer of PTFE (a.k.a. Teflon), which is not reactive for many liquids. The magnet is placed within a container and made to spin with an external magnetic field. Typically, this is produced by a stir-plate, which has another magnet rotating underneath the container.
What materials are used in a magnetic stirrer?
The magnetic component is typically made of ALCINO, an alloy of aluminum (Al), Nickel (Ni), and cobalt (Co), which is suitable for most applications. There are some stir bars available that use samarium cobalt, which will offer stronger coupling with the internal magnet of the stirrer and reduce the chance of the bar spinning out.
Why choose SP scienceware™ polygon spinbar™ magnetic stirring bars?
SP Scienceware™ Polygon Spinbar™ Magnetic Stirring Bars without Pivot Ring are manufactured in a registered ISO 9001:2008 facility. Octagon magnetic stirring bars with integral pivot ring are the most commonly used shape for stirring small volumes in vessels such as vials, tubes and gradient makers.