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Changes to Magnetic Stirrer Introduction

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Introduction
'''Uses:''' Magnetic stirrers (also known as magnetic stir plates) are very common in experimental chemistry and biology. They are used to mix components (solids and liquids) to get homogeneous liquid mixtures. Common examples include bacterial growth media and buffer solutions. [ … ] '''How They Work:''' Magnetic stirrers mix solutions using an external magnetic field that rotates a small magnetic bar that has been placed in the mixture of interest. [ … ] '''Advantages:''' Magnetic stirrers minimize the risks of contamination since only an inert magnet bar, which can easily be cleaned, is put inside the sample/fluid. In addition, using a magnetic stirrer rather than manual stirring is critical for consistent, reproducible mixing or mixing over long time scales. Protein dialysis, for example, requires multi-hour or overnight sample mixing and is sensitive to bacterial contamination. [ … ] '''This Magnetic Stirrer:''' Can rotate an internal magnet at variable speeds, mixing volumes up to one liter. Glassware with a stir bar is placed directly on top of the stirrer unit. The device is battery-operated and largely isolated from spills by its plastic case and gasket.
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Tools

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  • Screw Driver x1 added.

Parts

  • DC Motor x1 added.
  • Magnetic Stir Bar x1 added.
  • LED x1 added.
  • 9V battery x1 added.
  • Electrical compontents (described below) x1 added.
  • Rare earth magnets x1 added.
  • Rotor Body x1 added.
  • Circuit board x1 added.
  • Knob (for tuning stir speed) x1 added.
  • Scrap flat steel x1 removed.
  • Nuts, bolts x1 removed.

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