What does a magnetic stir bar do?
A magnetic stirrer is a device widely used in laboratories and consists of a rotating magnet or a stationary electromagnet that creates a rotating magnetic field. This device is used to make a stir bar, immerse in a liquid, quickly spin, or stirring or mixing a solution, for example.
How do I choose a magnetic stir bar?
The length of the bar should be about equal to the magnet size to avoid spinout. Spinout occurs when the bar loses its coupling with the internal magnet of the stirrer and the bar stops spinning altogether. Stir bars significantly longer than the internal magnet might reduce the max speed the bar may be spun.
Do I need a magnetic stirrer?
If you are mixing a low-viscosity liquid in higher volumes, an overhead stirrer is probably the right way to go. However, if your liquid is more viscous and you don’t need the extra capacity that overhead stirrers offer, a magnetic stirrer is a better choice since you don’t have to worry as much about overheating.
Are magnetic stir bars Food Safe?
3 centimeter x 9/32″ magnetic stir bar. Food grade plastic coating. Safe for use in heated or unheated stir plate applications.
What is a magnetic stir bar made of?
Many stir bars are made with ceramic or Alnico magnets. Ceramic magnets are inexpensive and common, but not nearly as strong as a neodymium magnet. They have only about 8-10% of the pull force. Alnico magnets are made from aluminum, nickel and cobalt.
What is a stir bar made out of?
Magnetic stir bars are generally made of ALNICO (an alloy of aluminum, nickel, iron and cobalt) magnets encapsulated in an FDA approved PTFE coating.
What is a Teflon stir bar?
A pristine stir bar made of ferromagnetic metal with a PTFE, or Teflon, coating. chemists discovered the inert bars, which are commonly used to mix chemicals, cause unwanted results during Billups-Birch reactions with carbon and other nanotubes. ( Credit: Brandon Martin) chemistry.
How do you clean magnetic stirrer 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. “I was surprised that there was enough metal there to catalyze reactions,” says Vladimir Gevorgyan, an organic chemist at the University of Illinois at Chicago.
What is a magnetic stirring bar?
Magnetic stirring bars provide effective stirring of samples via magnetic manipulation. Many models feature an octagonal shape with a central integrated pivot ring for optimal turbulence while stirring thanks to a greater surface area. The heavy-duty magnetic strips is one of the frequently used tools, strong enough to hold the solution.
What is a flea magnetic stirring bar?
Description: Micro (Flea) magnetic stirring bars are designed for stirring small volumes in vessels such as vials, tubes and gradient makers. Description: These stirbars have polygon multifaceted surfaces that add turbulence relative to similar smooth size cylindrical bars.
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.
How do you pull Stirring bars out of containers easily?
Pull stirring bars out of containers easily with a magnet. The multifaceted magnetic stirring bar surface adds turbulence relative to similar size smooth cylindrical stirring bars. 13 in. long, for deep vessels. Includes 16 stir bars. Fisherbrand™ Octagonal Magnetic Stir Bar Kit offers a convenient kit packed in compartmented storage box.
