Picture offshore wind farm

Open Access research that is improving renewable energy technology...

Strathprints makes available scholarly Open Access content by researchers across the departments of Mechanical & Aerospace Engineering (MAE), Electronic & Electrical Engineering (EEE), and Naval Architecture, Ocean & Marine Engineering (NAOME), all of which are leading research into aspects of wind energy, the control of wind turbines and wind farms.

Researchers at EEE are examining the dynamic analysis of turbines, their modelling and simulation, control system design and their optimisation, along with resource assessment and condition monitoring issues. The Energy Systems Research Unit (ESRU) within MAE is producing research to achieve significant levels of energy efficiency using new and renewable energy systems. Meanwhile, researchers at NAOME are supporting the development of offshore wind, wave and tidal-current energy to assist in the provision of diverse energy sources and economic growth in the renewable energy sector.

Explore Open Access research by EEE, MAE and NAOME on renewable energy technologies. Or explore all of Strathclyde's Open Access research...

Electrowetting controls the deposit patterns of evaporated salt water nanodroplets

Zhang, Jun and Borg, Matthew K. and Ritos, Konstantinos and Reese, Jason M. (2016) Electrowetting controls the deposit patterns of evaporated salt water nanodroplets. Langmuir, 32 (6). pp. 1542-1549. ISSN 0743-7463

[img]
Preview
Text (Zhang-etal-Langmuir2016-Electrowetting-controls-the-deposit-patterns)
Zhang_etal_Langmuir2016_Electrowetting_controls_the_deposit_patterns.pdf
Final Published Version
License: Other

Download (6MB) | Preview

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.