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Superdendrites in Directional Solidification of Polymer-Solvent Mixtures

Published online by Cambridge University Press:  10 February 2011

Rolf Ragnarsson ,
Brian Utter  and
Eberhard Bodenschatz
Rolf Ragnarsson
Affiliation:
Laboratory of Atomic and Solid State Physics, Cornell University, Ithaca, NY 14853–2501
Brian Utter
Affiliation:
Laboratory of Atomic and Solid State Physics, Cornell University, Ithaca, NY 14853–2501
Eberhard Bodenschatz
Affiliation:
Laboratory of Atomic and Solid State Physics, Cornell University, Ithaca, NY 14853–2501
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Abstract

The directional solidification of the transparent binary alloy succinonitrile-poly(ethylene oxide) was studied in an experiment in which solidification speeds of about 2 mm/sec could be reached without loss of the linear temperature gradient. The low diffusivity of the polymer solute allowed the study of the dynamics of rapid solidification using an optical microscope. For both normal and doublonic dendrites we observed a transition to large triangular “superdendrites” above a certain solidification speed and we report measurements of the primary and secondary spacing as a function of the pulling speed. Our measurements suggest that the observed triangular shape is due to a decoupling of primary and secondary growth at large undercooling.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 481: Symposium P – Science and Technology of Semiconductor Surface Preparation , 1997 , 65
Copyright
Copyright © Materials Research Society 1998

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References

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