Predicting
and controlling a droplet’s behavior on surfaces
is very complex due to several factors affecting its nature. These
factors play a crucial role in colloidal material deposition and related
solution-based manufacturing methods such as printing. A better understanding
of the processes governing the droplet in the picoliter regime is
needed to help develop novel thin-film manufacturing methods and improve
the current ones. This study introduces the substrate temperature
as a method to control the droplet’s behavior during inkjet
printing, especially the coffee-ring phenomena, at an unprecedented
temperature range (25–250 °C). To explain the particular
behavior of the droplet, this research associates the creation of
specific coffee-ring micro/nanostructures at elevated temperatures
with the Leidenfrost effect that is responsible for creating a vapor
pocket under the drying drop. Herein, we combine experimental data
and numerical methods to explain the drying dynamic of the picoliter-size
droplet on the substrate at elevated temperatures. The achieved results
indicate that the coffee-ring effect is correlated with the heat-transfer
changes caused by the Leidenfrost effect and can be controlled and
used to produce micro/nanostructured thin films without additional
processing steps.
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