Title

Controlling super-cooling of encapsulated phase change nanoparticles for enhanced heat transfer

Authors

Authors

Y. Hong; W. Wu; J. J. Hu; M. H. Zhang; A. A. Voevodin; L. Chow;M. Su

Comments

Authors: contact us about adding a copy of your work at STARS@ucf.edu

Abbreviated Journal Title

Chem. Phys. Lett.

Keywords

PREVENTION; DSC; Chemistry, Physical; Physics, Atomic, Molecular & Chemical

Abstract

Adding phase change nanoparticles into fluid enhances heat capacity, but supercooling of nanoparticles requires fluid working with large temperature difference, which limits heat transfer benefit. This Letter describes a method to reduce supercooling by encapsulating indium nanoparticles in non-melting shells of semi-crystalline silica derived from sodium silicate. Not only can the rough surface and matching structure of shells prevent molten cores from leakage or agglomeration, they allow heterogeneous nucleation during, solidification of nanoparticles and reduce supercooling up to 30 degrees C. The operating parameter including overheating, heating and cooling rates can be adjusted to reduce supercooling by 7 degrees C for silica shells derived from tetraethylorthosilicate. Published by Elsevier B.V.

Journal Title

Chemical Physics Letters

Volume

504

Issue/Number

4-6

Publication Date

1-1-2011

Document Type

Article

Language

English

First Page

180

Last Page

184

WOS Identifier

WOS:000288024000014

ISSN

0009-2614

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