Abstract
By using sandpaper of different grit, we have scratched up smooth sheets of acrylic to cover their surfaces with disordered but near parallel micro-grooves. This procedure allowed us to transform the acrylic surface into a functional surface; measuring the capillary rise of silicone oil up to an average height h¯, we found that h¯ evolves as a power law of the form h¯∼tn, where t is the elapsed time from the start of the flow and n takes the values 0.40 or 0.50, depending on the different inclinations of the sheets. Such behavior can be understood alluding to the theoretical predictions for the capillary rise in very tight, open capillary wedges. We also explore other functionalities of such surfaces, as the loss of mass of water sessile droplets on them and the generic role of worn surfaces, in the short survival time of SARS-CoV-2, the virus that causes COVID-19.
Highlights
We experimentally studied the functionality of acrylic sheets when they were subjected to irregular scratching, nearly along a single direction
We revisited the classical theory of the capillary action by showing the formation of a liquid meniscus on vertically standing acrylic sheets
Taking into account all these fundamental features of capillary action, we used 50 and 150 grit sandpapers in order to carve V-grooves on the face of the acrylic sheet and several of their geometrical characteristics were explored with the use of electronic microscopy
Summary
Research on the fabrication and physical behavior of functional surfaces, e.g., micro-structured surfaces with singular features able provide one or more functional properties, mainly those related to fluid transport, is a very relevant topic of study [1,2,3,4,5,6,7,8]. The irregular texturing applied to acrylic surfaces influences the temporal mass reduction of droplets, but the question is if evaporation or spreading dominates over one another To quantify these processes, experiments of sessile droplets on scratched acrylic surfaces and on human skin will be analyzed. Experiments of sessile droplets on scratched acrylic surfaces and on human skin will be analyzed In both of these latest cases, we will show that the droplets loss their mass at a high rate due to the capillary penetration into the V-grooves evaporation seems to be a marginal phenomenon in the loss of mass of the droplets.
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