CUED Publications database

How PEDOT:PSS solutions produce satellite-free inkjets

Hoath, SD and Jung, S and Hsiao, W-K and Hutchings, IM (2012) How PEDOT:PSS solutions produce satellite-free inkjets. Organic Electronics: physics, materials, applications, 13. pp. 3259-3262. ISSN 1566-1199

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Abstract

Satellite droplets are unwanted in inkjet printing and various approaches have been suggested for their reduction. Low jetting speeds limit applications of the process. Added surfactants for wetting and conductivity enhancement may help but dynamic surface tension effects may counteract improvements. A higher fluid viscosity delays ligament break-up, but also leads to slower jets, while viscoelasticity reduces satellite formation only in certain cases. We show here that aqueous solutions of PEDOT:PSS (1:2.5 by weight) are strongly shear-thinning. They exhibit low viscosity within the printing nozzle over a wide range of jet speeds, yet rapidly (<100 μs) recover a higher viscosity at the low shear rates applicable once the jet has formed, which give the benefit of delayed satellite formation. The delay over a 0.8 mm stand-off distance can be sufficient to completely suppress satellites, which is significant for many printing applications. © 2012 Elsevier B.V. All rights reserved.

Item Type: Article
Uncontrolled Keywords: DoD (drop-on-demand) inkjet printing PEDOT:PSS (poly(3,4-ethylenedioxythiophene):(polystyrene-sulphonate)) Satellites Shear-thinning fluid Surfactant Viscoelastic
Subjects: UNSPECIFIED
Divisions: Div E > Production Processes
Depositing User: Cron Job
Date Deposited: 07 Mar 2014 11:40
Last Modified: 11 Dec 2014 19:02
DOI: 10.1016/j.orgel.2012.10.004