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In this work, zeolite membrane layer was synthesized on alumina substrate by the secondary growth method, The substrate surface was modified in order to facilitate the adsorption of seed crystals.
Clouds at high altitude are a good example for this- they contain tiny droplets of water that, in the absence of seed crystals do not form ice despite the low temperatures.
The seed crystals were produced from 30 gram of Univar AR grade borax dissolved in 100 mL of Milli-Q water by heating up until 60[degree]C and filtered through filter paper.
He reports using such "fuzzy" automata to simulate snowflake growth around hexagonal seed crystals.