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On the correlation between droplet volume and irradiation conditions in the laser forward transfer of liquids

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Abstract

The analysis of the morphology of droplets printed through laser-induced forward transfer (LIFT) of liquid films shows that: (i) the droplet volume is linearly related with the energy of the laser pulse that originated it, (ii) the liquid ejection process is activated by an energy density threshold F 0, and (iii) the droplet volume can be correlated with a dimensional parameter of the laser beam through an oversimple model that states that the amount of printed liquid equals the liquid contained in the cylindrical portion of an irradiated film whose base corresponds to the cross-sectional area of the beam with energy density higher than F 0. Although these issues seem to describe correctly the LIFT process, some problematic instances arise from them. Thus, the linear relation between droplet volume and laser pulse energy seems to be inconsistent with the existence of the threshold F 0. On the other hand, the compatibility between the model and the aforementioned linear relation requires to be explained. Finally, the model is based on the idea that transfer takes place in a way analogous to the LIFT of solid films, but time-resolved imaging studies have demonstrated that liquid ejection follows a dynamics which seems quite unsuited with that idea. In this work previous results are re-analyzed and new experiments are performed in an attempt to clarify these questions. It is then shown that the inconsistencies pointed out are only apparent, and that the validity of the model is limited to irradiation conditions where the beam dimensions are significantly larger than the thickness of the liquid film. Furthermore, an explanation is provided for the dependence of the success and failure of the model on those irradiation conditions in terms of the diverse liquid ejection dynamics taking place.

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Notes

  1. In fact, E−E 0 corresponds to the volume equivalent to the shaded area in the three-dimensional plot.

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Acknowledgements

This work is funded by MCI of the Spanish Government (Projects MAT2010-15905 and CSD2008-00023), by Fondo Europeo de Desarrollo Regional (FEDER), and by the EU project eLIFT (Grant agreement 247868).

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Authors and Affiliations

  1. Department of Mechanical and Aerospace Engineering, Princeton University, Princeton, NJ, 08544, USA

    M. Duocastella

  2. Departament de Física Aplicada i Òptica, Universitat de Barcelona, Martí i Franquès 1, 08028, Barcelona, Spain

    A. Patrascioiu, J. M. Fernández-Pradas, J. L. Morenza & P. Serra

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  1. M. Duocastella
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  2. A. Patrascioiu
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  3. J. M. Fernández-Pradas
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  4. J. L. Morenza
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  5. P. Serra
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Correspondence to P. Serra.

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Duocastella, M., Patrascioiu, A., Fernández-Pradas, J.M. et al. On the correlation between droplet volume and irradiation conditions in the laser forward transfer of liquids. Appl. Phys. A 109, 5–14 (2012). https://doi.org/10.1007/s00339-012-7047-7

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  • DOI: https://doi.org/10.1007/s00339-012-7047-7

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