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Design optimization of ink in electrohydrodynamic jet printing: Effect of viscoelasticity on the formation of Taylor cone jet

2015; Elsevier BV; Volume: 89; Linguagem: Inglês

10.1016/j.matdes.2015.09.141

1873-4197

Milim Yu, Kyung Hyun Ahn, Seung Jong Lee,

Surface Modification and Superhydrophobicity

The formation of Taylor cone jet is a key process in electrohydrodynamic printing that is used to produce high resolution patterns. Even though the inks are complex fluids composed of particles, binder, and solvent, most of previous researches have assumed the ink as a Newtonian fluid. In this study, we investigate the effect of viscoelasticity of the ink on Taylor cone jet using two model systems designed to control the elasticity and viscosity of the ink independently. The elasticity and viscosity improve the stability by expanding the operating windows for Taylor cone jet. The results can be summarized in terms of two parameters: elasticity parameter, ξ, and viscosity parameter, χ. The increase in elasticity widens the range of voltage for Taylor cone jet zone, while the range of flow rate remains independent of elasticity. The effect of elasticity is dominant for ξ > 1while it is nearly negligible for ξ < 1. When the viscosity is increased, the Taylor cone jet zone is widened mainly by the flow rate whenχ < 1, while the voltage stabilizes the Taylor cone jet for χ > 1. This study will contribute to the optimal design of EHD printing ink by providing the operating window maps in terms of material properties.