4.7 Article

Effect of surfactant concentration on the evaporation of droplets on cotton (Gossypium hirsutum L.) leaves

Journal

COLLOIDS AND SURFACES B-BIOINTERFACES
Volume 167, Issue -, Pages 206-212

Publisher

ELSEVIER SCIENCE BV
DOI: 10.1016/j.colsurfb.2018.04.018

Keywords

Surfactant; Evaporation time; Cotton leaf surface

Funding

  1. National Key R&D Program of China [2017YFD0200306]
  2. National Natural Science Foundation of China (NSFC) [31471805]

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The evaporation kinetics of pesticide droplets deposited on a leaf surface can affect their application efficiency. Evaporation of droplets on the hydrophobic leaves has received considerable attention, but little is known about hydrophilic leaf surfaces. In this study, the effect of surfactant concentration on the evaporation of droplets deposited on cotton leaves was investigated. The evaporation time is roughly decreased for concentrations ranging from 0% to 0.01% and increased from 0.01% to 0.10%. Contrary to the widely held belief that pesticide retention on target crops can rapidly be formed only with surfactant concentrations exceeding the CMC (critical micelle concentration), this study demonstrates that, on hydrophilic cotton leaves, fast evaporation of the droplet at surfactant concentrations of 0.01% (CMC) can reduce the volume quickly, lower the loss point and enhance pesticide retention. In addition, the evolution of droplet volume, height and contact angle on the cotton leaf surface were measured to confirm this conclusion. The result presented herein can be used to guide the use of surfactants and pesticides in agriculture. (C) 2018 Elsevier B.V. All rights reserved.

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