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Drop-on-demand for aqueous solutions of sodium alginate

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Abstract

Inkjet printing is a rapidly growing commercial process for applications that depend on precisely patterning micro-scale droplets. These applications increasingly require complex fluids, introducing viscoelastic properties which play an important role in droplet formation. The objective of this study is to determine how to obtain single, uniform and spherical (“successful”) droplets from aqueous solutions of sodium alginate with a piezoelectric drop-on-demand printing method. In order to control the volume and velocities of droplets, the effect on the droplet formation of the characteristics of the waveform such as voltage amplitude and dwell time is studied. The results depend also on the fluid rheology. The viscosity of the chosen fluid is a function of the concentration, as the viscoelastic properties increase at higher concentration. In this paper, the droplet formation process is characterized in terms of both the waveform and the rheological properties of the solution. The characterization of the fluids and waveform will be pursued first and the droplet formation and its control will be studied. Finally, the results will be presented with a map in ranges of the Ohnesorge, Deborah and Weber numbers.

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Acknowledgments

The work of CLH was supported by a National Science Foundation Graduate Research Fellowship. The authors would like to acknowledge Meng Zhang and Jinxiang Zhou for helping with the measurements of the material physical properties and Changxue Xu for fruitful discussions. The authors would also like to thank Vince Herran for help with image processing. Thanks for use of a high-speed camera to Jerry Eimen (host) and Randy Schoon (R&D and lab technician) at Cryovac Inc. Duncan, SC.

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  1. Department of Mechanical Engineering, Clemson University, Clemson, SC, 29634, USA

    C. Leigh Herran & Nicole Coutris

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  1. C. Leigh Herran
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  2. Nicole Coutris
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Correspondence to C. Leigh Herran.

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Herran, C.L., Coutris, N. Drop-on-demand for aqueous solutions of sodium alginate. Exp Fluids 54, 1548 (2013). https://doi.org/10.1007/s00348-013-1548-9

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