Synthesis of mesostructured thin films by ionic wind assisted electrostatic spray deposition--颗粒学报PARTICUOLOGY

Khodadadi, S., Meesters, G. M. H., & Biskos, G. (2016). Synthesis of mesostructured thin films by ionic wind assisted electrostatic spray deposition. Particuology, 27, 128-132. https://doi.org/10.1016/j.partic.2015.09.006

Synthesis of mesostructured thin films by ionic wind assisted electrostatic spray deposition

S. Khodadadi ^a, G.M.H. Meesters ^a, G. Biskos ^{a b c *}

a Faculty of Applied Sciences, Delft University of Technology, Delft 2628-BL, Netherlands
b Faculty of Civil Engineering and Geosciences, Delft University of Technology, Delft 2628-CN, Netherlands
c Energy Environment and Water Research Center, The Cyprus Institute, Nicosia 2121, Cyprus

10.1016/j.partic.2015.09.006

Volume 27, August 2016, Pages 128-132

Received 12 June 2015, Revised 9 August 2015, Accepted 18 September 2015, Available online 4 January 2016, Version of Record 14 June 2016.

E-mail: g.biskos@tudelft.nl; g.biskos@cyi.ac.cy

Highlights

• The ionic wind assisted electrostatic spray deposition (ESD) method was introduced.

• The method could yield larger droplets than classical ESD due to surface charge modulation.

• The method was used to produce mesostructured films using WO₃ as a test material.

Abstract

Thin films produced by electrostatic spray deposition (ESD) have nanometer-sized structures despite the initial sprayed droplets being typically a few tens of microns in diameter. The size and morphology of the resulting structures is not only affected by the solvent properties and drying kinetics, but also by Coulomb fission owing to the high surface charge density that the droplets build up upon evaporation. In this work we modulate the charge density of the droplets by inducing ionic wind along the spray, and produce mesoscopic structures. Using WO₃ as an example, we show that the technique provides a practical way to control the morphology of thin films produced by ESD.

Graphical abstract

Keywords

Electrohydrodynamic atomization; Electrospray; Aerosol; Tungsten oxide; Porous thin film

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