Oscillations of aqueous PEDOT:PSS fluid droplets and the properties of complex fluids in drop-on-demand inkjet printing
- Hoath, SD
- Hsiao, WK
- Martin, GD
- Jung, S
- Butler, SA
- Morrison, NF
- Harlen, OG
- Yang, LS
- Bain, CD
- Hutchings, IM
DOIAbstract
Shear-thinning aqueous poly(3,4-ethylenedioxythiophene): poly(styrene sulfonate) (PEDOT:PSS) fluids were studied under the conditions of drop-on-demand inkjet printing. Ligament retraction caused oscillation of the resulting drops, from which values of surface tension and viscosity were derived. Effective viscosities of <4 mPa s at drop oscillation frequencies of 13 to 33 kHz were consistent with conventional high-frequency rheometry, with only a small contribution from viscoelasticity with a relaxation time of about 6 μs. Strong evidence was found that the viscosity, reduced by shear-thinning in the printhead nozzle, recovered as the drop formed. The low viscosity values measured for the drops in flight were associated with the strong osci...
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