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Lab scale equivalent of a double-motion agitator
Dear experts, I’m looking for a lab scale (<5liter) “equivalent” of a double motion agitator. Or let me put it different; my aim is to have a good mixing power everywhere in my vessel despite low sheer mixing. It has to work for emulsification, and the emulsifier does not handle high-sheer well. It needs mixing at around 3-400 rpm.
I’m sure that the anchor and paddle is not managing it, and the propeller 3-bladed also has a low power further away from the blades. How about the other ones?
Appreciate your advice.
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6 Replies
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The paddle blade will approximate it if you are using a 600ml beaker. Honestly, counter-rotating a 316SS spatula with a strong right arm while the impellor (3-blade propeller in this catalog) runs at low speed works best for me. For larger batches use a KitchenAid blender at the lowest speed and the planetary attachment.
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@BettiB may i ask what company that screenshot is from? I am looking to purchase a couple of the mixing blades in that picture.
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@chemicalmatt, that is a fantastic idea with the Kitchen Aid. Thanks a lot. Do you think that the whisk attachment would bring too much air into the w/o emulsion? Or is it something not to worry about?
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@GeorgeBenson, it is IKA blades.
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@BettiB Affirmative, you do run that risk, why I only use the lowest speed setting when mixing viscous formulations or those that foam. The higher speeds on the KitchenAid work fine for emulsification and dispersion when the batch is liquid at higher temps. Also, I’ll disperse carbomer with it at RT, then stop, let air vacate, then put on low speed with the dough (planetary) blade to neutralize and form an air-free gel.
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@chemicalmatt that makes fully sense. Appreciate you sharing your experience and methods.
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