Re: [DIYbio] Why doesn't someone engineer a simple _____?

On 08/24/2014 01:47 AM, Patrik D'haeseleer wrote:
> This non-toxic Bismuth/Tin alloy <http://www.rotometals.com/product-p/lowmeltingpoint281alloy.htm> meltsat 138 °C (281 °F), not
> much above autoclaving temperature. You may be able to mold a PCR heater block by simply sticking PCR tubes into the molten metal.

The huge thermal lag caused by a large mass is undesirable. It just drives up
the Wattage of heaters required, makes parts more expensive, sends more waste heat into the room.

Rapidly transferring heat to the vials one uses is what is wanted. That can be done
with low mass -- heaters inclose proximity to the vials -- individually wrapped,
or a flowing medium swirling around the tubes and no need for any other intermediate
that is solid. Air or liquid heat transfer is best. Air is the simplest fluid to
deal with -- no need for cleanup, wipe off, or problem of spreading around of heat transfer fluid.

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