We have a Dimatix inkjet printer which we would like to use to deposit a selection of organic semiconductors and conductors. The issue we are facing are the strict requirements on the ink, most notably the narrow allowed viscosity range of 10-12 cP.
I would like to ask if optimising the viscosity, surface tension and choosing a high boiling point solvent is enough to ensure good jetting of the polymers and small molecules in general. In the case of viscosity, has anyone tried printing non-Newtonian fluids?
Thank you!
Thank you Markus for the reply. I do have this book and it is definitely helpful. However, there is relatively little content on the composition and optimisation of functional inks, especially when taking into account the large amount of experience present in the industry. Almost nothing is said about non-Newtonian fluids. Still, I will carry on searching the literature.
I'm facing the same problem too. the ink that i bought drips from the printhead nozzles.it might be associated with insufficient surface tension. do you have the solution on ink formulation?
Sounds right to me, could be viscosity as well. Make sure that you know both the viscosity and surface tension requirements in the temperature range you are interested in. If you are printing very small amounts, then a good way of measuring viscosity is by using a rheometer, whereas surface tension you can measure with the contact angle method.
we obtained a "organic conductive inks kit" from SigmaAldrich, they have 4 PlexCore inks which worked with our Dimatix. However, you need someone with the endurance to spend hours optimising the printing waveforms.
Generally its also good if the ink changes its viscosity with temperature, so you can tune it in the dimatix.
Hi Patrick, can you share with me the books for the chemistry of inkjet printing.
I'm very new in Dimatix. i bought the ink from Futurrex .
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