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

    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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