CUED Publications database

Properties of PEDOT: PSS from oscillating drop studies

Hoath, SD and Hsiao, WK and Jung, S and Yang, LS and Bain, CD and Wright, SC and Morrison, NF and Harlen, OG and Martin, GD and Hutchings, IM (2014) Properties of PEDOT: PSS from oscillating drop studies. In: UNSPECIFIED pp. 299-303..

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© 2014 Society for Imaging Science and Technology. PEDOT:PSS is commonly inkjet printed in aqueous solutions with surfactant additives for improved electrical properties in organic electronics applications. These shear thinning complex fluids have been found to DoD jet surprisingly well over a wide range of drive voltages and drop speeds, behaving rather like Newtonian fluids with far (ten times) lower viscosities than measured at low shear-rate. As ∼ 1 wt% PEDOT: PSS solutions showed little evidence for satellite production even at high jet speeds this would suggest that the fluid has regained high viscosity levels, in order to slow the necking rate, on timescales < < 100 μs and much faster than accessible to conventional mechanical testing means. Experimental work on the break-up of Newtonian ligaments was recently extended to DoD-scale ligaments, and supports the interpretation that the PEDOT: PSS ligaments attain higher viscosity during flight than during the jet emergence from the print head nozzle, although such rapid recovery timescales for PEDOT: PSS were not predicted from its measured rheology. Our recent work has focused on oscillating drop (OD) techniques for determination of properties of DoD (50 μm) scale aqueous PEDOT:PSS solutions (with and without surfactants) and on a larger (3mm) dispensing scale for more general shear thinning fluids. Imaging studies by one of us (SW) evaluated diffraction effects on OD analyses. The small effects of weak elasticity on the drop oscillations, as assessed theoretically by Khismatullin and Nadim (2001), have been exploited to provide new limits to the recovery time for aqueous PEDOT: PSS based on the fluid viscosity deduced from measured rheology and OD decay rate. These limits are consistent with recent numerical simulations of shear thinning fluid jetting.

Item Type: Conference or Workshop Item (UNSPECIFIED)
Divisions: Div E > Production Processes
Depositing User: Cron Job
Date Deposited: 17 Jul 2017 19:09
Last Modified: 07 Jun 2018 02:05