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Dynamic behaviours of water droplet impacting antiwetting plant leaves

Author Affiliations

  • 1School of Chemical and Physical sciences, Department of Industrial Chemistry, Atmiya University, Rajkot, 360005 India and School of Science & Technology, Nottingham Trent University, Nottingham, NG11 8NS, United Kingdom
  • 2School of Science & Technology, Nottingham Trent University, Nottingham, NG11 8NS, United Kingdom and Department of Engineering, University of Bristol, Bristol, BS8 1QU, United Kingdom
  • 3School of Science & Technology, Nottingham Trent University, Nottingham, NG11 8NS, United Kingdom

Res.J.chem.sci., Volume 9, Issue (2), Pages 16-23, April,18 (2019)

Abstract

Natural minute structures have been analyzed on numerous kind of surfaces like rose leaves, which are helpful for the development of biomimetic materials for self cleaning, fluidic drag reduction, bio-surface, anti-biofouling and prevention of water corrosion. We examined the micro scale structure on the leaves of Leucophyllumfrutescens (Purple sage), Lactuca virosa (Wild lettuce), Montbretia (Crocosmia) and Corymbia (Eucalyptus). Water droplet impact velocity V of 2m/s and 4m/s from the fixed distance shows rebound, oscillations and fragmentation. These are due to uneven distribution of small micro dots, three dimension waxes and tiny horizontal lines on the surfaces. At comparatively low impact velocity, partial bounce back and oscillations, and fragmentation and splashing were observed as velocity was increased. For characterization of wettability of the surface, Contact angle experiments have been performed and Cassie-Baxter and Wenzel approaches are discussed. Highest static contact angle (118.02±7.46) was observed on Leucophyllumfrutescens (Purple sage) surface due to densely covered with three dimensional waxes. However, lowest static contact angle (98.38±4.91) was observed on Eucalyptus (Corymbia) surface with small dots on the surface.

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