I am trying to buy a Petri dish with a small diameter for nanofluid photo-thermal conversion experiment but the smallest diameter I found starts from 30-35 mm which doesn't fit my experiment conditions. Thanks
Can you try a coin capsule such as?
https://www.ebay.com/itm/Prophila-coin-capsules-diameter-26-mm-pack-of-100-/232327914223
10 can be found as cheap as $5.39:
http://www.hobbiesdepot.com/supplies/Pack-of-10-Lighthouse-Round-25mm-Inner-Diameter-Coin-Capsules?language=en¤cy=USD&gclid=EAIaIQobChMIg671n4zE2wIVkjqBCh3QkQMHEAQYBCABEgIoBfD_BwE
Cole-Parmer used to produce tiny "Petri" dishes (cell/tissue culture dishes) and at the moment, they seem to still be making 18mm diameter dishes:
https://www.coleparmer.com/p/cell-and-tissue-culture-dishes/67981
Alan F Rawle, Tomasz Jarosz .. much thanks
For anyone has the same problem, I couldn't find such a size in the market so I used clear perspex 000 material and shaped it using CNC machine.
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