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Ultrasound-Enhanced Spray Drying of Polymer Micro-emulsions for Nanoparticles Synthesis*

Published online by Cambridge University Press:  21 March 2011

Shirley C. Tsai ,
C. Y. Chen ,
Y. L. Song ,
C. S. Tsai ,
H. S. Tsai  and
W. Y. Chiu
Shirley C. Tsai
Affiliation:
Department of Chemical Engineering, California State University, Long Beach, CA
C. Y. Chen
Affiliation:
Institute for Applied Science and Engineering Research, Academia Sinica, Taipei, Taiwan
Y. L. Song
Affiliation:
Institute for Applied Science and Engineering Research, Academia Sinica, Taipei, Taiwan
C. S. Tsai
Affiliation:
Institute for Applied Science and Engineering Research, Academia Sinica, Taipei, Taiwan
H. S. Tsai
Affiliation:
Department of chemical Engineering, National Taiwan University, Taipei, Taiwan
W. Y. Chiu
Affiliation:
Department of chemical Engineering, National Taiwan University, Taipei, Taiwan
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Abstract

In this paper we report the experimental results that polymer micro-emulsions (up to 10 wt%) behave like Newtonian liquids in ultrasound-modulated two-fluid (UMTF) atomization. Specifically, the emulsion drops generated are much smaller and more narrowly sized than those generated in conventional ultrasonic atomization (without air). After spray drying, the PMMA emulsion drops yield uniform nanoparticles that were originally dispersed in the micro-emulsion. Contrary to the conventional view that viscoelastic liquids are more difficult to atomize than Newtonian liquids, we found that ultrasound enhanced atomization of viscoelastic liquids such as gel-forming xanthan gum solutions. Under similar aerodynamic conditions using UMTF atomization at 54 kHz, 40-μm-diameter uniform drops were obtained for Xan solutions, but not for Newtonian aqueous glycerol of same viscosity.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 676: Symposium Y – Synthesis, Functional Properties and Applications of Nanostructures , 2001 , Y3.28
Copyright
Copyright © Materials Research Society 2001

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Footnotes

§

Also, Department of Electrical and Computer Engineering, University of California, Irvine, CA

*

Supported by the National Science Foundation, USA, and the National Science Council and the Academia Sinica, Taiwan

References

REFERENCES

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