Abstract
The dynamics of sucessive impacts of water droplets against flat glass surfaces covered by Langmuir-Blodgett films of zinc stearate with 1, 3, 5 and 7 layers was investigated. The structure and resistance of monolayers to the impact was evaluated by using fast images of the drop deformation, Brewster angle microscopy (BAM) and contact angle measurements. Eventual disruption (erosion) of the layers was investigated by using sum-frequency vibrational spectroscopy (SFG).
Highlights
The impact of droplets on solid surfaces has been widely studied due to the numerous interests of application, such as the study of erosion by rain drops, by inkjet printing, spray cooling on hot surfaces, pesticides application on crops, etc.[1]
A sequence of photographs obtained after the impact of a drop against the bare surface of glass and covered with a certain odd number of monolayers (n) are shown in Figure 2 and a film of a drop impact can be seen in the Supplementary Information (SI) section
The fast images of the droplet deformation obtained after their impact against surfaces covered with Langmuir-Blodgett technique (LB) layers of Zn stearate revealed that their spreading mechanism in independent of the nature of the surface
Summary
The impact of droplets on solid surfaces has been widely studied due to the numerous interests of application, such as the study of erosion by rain drops, by inkjet printing, spray cooling on hot surfaces, pesticides application on crops, etc.[1]. The main goal was to evaluate how the chemical nature of the solid surface may influence the drop deformation after impact, as well as evaluating the resistance of the monolayers to eventual erosion. The contact angles (at the equilibrium) of water droplets (15 μL) on cover slips with different numbers of monolayers were obtained before and after the three impacts.
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