Stirring Hotplate
Stirring Hotplate - Related Videos
10:20
Mammalian Cell Encapsulation in Alginate Beads Using a Simple Stirred Vessel
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Cited by 13 •
2017
This video and manuscript describe an emulsion-based method to encapsulate mammalian cells in 0.5% to 10% alginate beads which can be produced in large batches using a simple stirred vessel. The encapsulated cells can be cultured in vitro or transplanted for cellular therapy applications.
10:49
Power Input Measurements in Stirred Bioreactors at Laboratory Scale
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Cited by 9 •
2018
The power input in stirred bioreactors can be measured through the torque that acts on the impeller shaft during rotation. This manuscript describes how an air bearing can be used to effectively reduce friction losses observed in mechanical seals and improve the accuracy of power input measurements in small-scale vessels.
11:31
Continuously-stirred Anaerobic Digester to Convert Organic Wastes into Biogas: System Setup and Basic Operation
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Cited by 34 •
2012
Laboratory-scale anaerobic digesters allow scientists to research new ways of optimizing existing applications of anaerobic biotechnology and to evaluate the methane producing potential of various organic wastes. This article introduces a generalized model for the construction, inoculation, operation, and monitoring of a laboratory-scale continuously stirred anaerobic digester.
07:18
Generating Lap Joints Via Friction Stir Spot Welding on DP780 Steel
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Cited by 2 •
2019
Here, we present a friction stir spot welding (FSSW) protocol on dual phase 780 steel. A tool pin with high-speed rotation generates heat from friction to soften the material, and then, the pin plunges into 2 sheet joints to create the lap joint.
08:15
Melting Points - Student Protocol
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2020
Source: Lara Al Hariri and Ahmed Basabrain at the University of Massachusetts Amherst, MA, USA Determining the Melting Points of Naphthalene, Urea, and an Unknown MixtureExpand In this experiment, you will measure the melting point range of two known substances, naphthalene and urea, by observing the melting phenomenon during heating. You'll then analyze a mixture of urea and an unknown substance to observe how the unknown impurity affects the melting point range. Put on a lab coat,...
FAQs
A rotating magnetic field moves the stir bar through the liquid, distributing dissolved substances and helping maintain a more uniform composition. This movement also improves contact between reactants, which is important when a procedure depends on consistent interaction throughout the vessel. Combined with controlled heating, agitation helps reduce temperature gradients that could otherwise make reaction conditions less reproducible.
Heating and stirring rates determine how consistently the sample experiences the intended reaction conditions. Insufficient agitation may leave concentration or temperature differences within the liquid, while unsuitable heating can compromise control of the procedure. Operators therefore adjust both settings for the specific sample and select compatible vessels and stir bars to support safe, effective operation.
The vessel contains the sample while receiving thermal energy from the electrically heated surface, and the magnetic stir bar transfers the rotating magnetic motion into the liquid. Their suitability affects how effectively heat and agitation reach the sample. Choosing appropriate components is therefore part of establishing controlled conditions for solution preparation, crystallization, reflux, or synthesis.
A basic workflow is to place the sample in a suitable vessel with an appropriate magnetic stir bar, position the vessel on the heated surface, and set the required heating and stirring rates. The operator then maintains conditions appropriate to the procedure, such as dissolution, reflux, or synthesis. Component selection and controlled adjustments support safe, reproducible work.
Common applications include dissolving materials, preparing solutions, crystallizing substances, carrying out reflux, and conducting synthesis. In each case, simultaneous heating and agitation can improve contact between components and reduce uneven conditions within the sample. The instrument is especially useful when a procedure requires both thermal control and consistent mixing rather than heating alone.
Reproducibility improves when samples experience comparable temperatures and compositions throughout a procedure. The heated surface supplies controlled thermal energy, while magnetic agitation reduces temperature gradients and promotes uniform contact between reactants. By selecting suitable vessels and stir bars and adjusting heating and stirring rates consistently, chemists can better control conditions across solution preparation, crystallization, reflux, and synthesis experiments.