Electrowetting controls the deposit patterns of evaporated salt water nanodroplets

Jun Zhang, Matthew K. Borg, Konstantinos Ritos, Jason M. Reese

Research output: Contribution to journalArticle

24 Citations (Scopus)
133 Downloads (Pure)

Abstract

So-called “coffee-ring” stains are the deposits remaining after complete evaporation of droplets containing non-volatile solutes. In this paper we use Molecular Dynamics to simulate the evaporation of salt water nanodroplets in the presence of an applied electric field. We demonstrate, for the first time, that electrowetted nanodroplets can produce various deposit patterns, which vary substantially from the original ring-like deposit that occurs when there is no electric field. If a direct current (DC) electric field with strength greater than 0.03 V/Å is imposed parallel to the surface, after the water evaporates the salt crystals form a deposit on the substrate in a ribbon pattern along the field direction. However, when an alternating current (AC) electric field is applied the salt deposit patterns can be either ring-like or clump, depending on the strength and frequency of the applied AC field. We find that an AC field of high strength and low frequency facilitates the regulation of the deposit patterns: the threshold electric field strength for the transition from ring-like to clump is approximately 0.006 V/Å. These findings have potential application in fabricating nanostructures and surface coatings with desired patterns.
Original languageEnglish
Pages (from-to)1542-1549
Number of pages8
JournalLangmuir
Volume32
Issue number6
Early online date20 Jan 2016
DOIs
Publication statusPublished - 16 Feb 2016

Keywords

  • electrowetting
  • nanodroplets
  • deposit patterns
  • evaporation
  • salt water

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