---------- Forwarded message ---------
From: Mac Cowell <mac@diybio.org>
Date: Thu, Feb 11, 2016 at 2:32 PM
Subject: Re: Copper beads as thermocycling "block" - Was: [DIYbio] What do open source PCRs need?
To: John Griessen <john@industromatic.com>
From: Mac Cowell <mac@diybio.org>
Date: Thu, Feb 11, 2016 at 2:32 PM
Subject: Re: Copper beads as thermocycling "block" - Was: [DIYbio] What do open source PCRs need?
To: John Griessen <john@industromatic.com>
According to wolfram alpha, copper is 6 times more thermally conductive than tin (400 W/mK vs 67 W/mK).
That's pretty big. Now I want to run the experiment.
We use a solid tin, and a solid aluminum thermocycling block vs copper beads packed all around the tubes. Even if the beads lose 80% of their thermal conductivity due to airspace and poor contact, they will still be conducting (theoretically) 0.20 * 400 W/mK = 80 W/mK, which is more than the solid tin.
Additionally, I would like to see what effect forcing air through the copper matrix has on the cooling rate...
I'm not a physicist, anyone else want to explain how this is really going to work?
On Thu, Feb 11, 2016 at 1:48 PM John Griessen <john@industromatic.com> wrote:
If you do any casting with plaster of paris you need to dry it completely before pouring hot metal, or the steam coming out can
splash the hot metal at you. (never experienced that and never want to -- always poured dry molds) Ambient conditions can get
plaster looking dry, but not dry enough -- needs oven time after days of air drying, or more oven time from start.
JG
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