How to avoid coffee rings when printing graphene devices - Physics World
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The coffee ring effect can be suppressed in 2D-crystal ink droplets by using a specific mixture of alcohols as a solvent. That…
The coffee ring effect can be suppressed in 2D-crystal ink droplets by using a specific mixture of alcohols as a solvent. That…
Enlarge / The coffee ring effect happens because evaporation occurs faster at the edge than at the center. (credit: MirageC/Gett…