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Reaction enhanced wetting of quartz by silicon droplets and its instabilities

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Abstract

A miniature reaction cell was developed in order to study the influence of gas phase components on reactive wetting and dewetting processes. Small silicon droplets on fused silica can be observed in situ at 4000 frames per second under reaction conditions by a microscope equipped with a high speed camera. Additionally, ex-situ investigations of etch profiles originating from the reactive wetting process are conducted by scanning electron microscopy (SEM) and atomic force microscopy (AFM). Under certain reactive conditions large dynamic spreading modes exhibiting a new type of droplet instability are observed. Some spread-out droplets suddenly disrupt and decay into a ring of smaller droplets. Each of these then spreads again and disrupts into a circular array of even smaller droplets forming a ring-shaped structure. Whole cascades of decay can be traced by means of the etch profiles found on the substrate. The results are discussed within a simple thermodynamic model that relates the changes in the oxygen chemical potential to the changes of solid–liquid interface tension.

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Acknowledgements

We gratefully acknowledge the support from the Wacker Siltronics company for providing the ultrapure silicon used for this study. Furthermore we thank Prof. R. Mawhorter for comments on the manuscript.

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Authors and Affiliations

  1. Institut für Physikalische Chemie und Elektrochemie, Gottfried-Wilhelm-Leibniz Universität Hannover, Callinstr. 3-3a, 30167, Hannover, Germany

    L. D. Alphei, R. Grotjahn, V. Becker, R. Janhsen, M. Douvidzon & J. A. Becker

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  1. L. D. Alphei
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  2. R. Grotjahn
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  3. V. Becker
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  4. R. Janhsen
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  5. M. Douvidzon
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  6. J. A. Becker
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Correspondence to L. D. Alphei.

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Dedicated to Professor Dr. Friedrich Hensel on the occasion of his 80th birthday.

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Alphei, L.D., Grotjahn, R., Becker, V. et al. Reaction enhanced wetting of quartz by silicon droplets and its instabilities. J Mater Sci 48, 7350–7359 (2013). https://doi.org/10.1007/s10853-013-7587-z

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  • DOI: https://doi.org/10.1007/s10853-013-7587-z

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