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    Research Article

    Self-Healing Phase Change Salogels with Tunable Gelation Temperature
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    • Parvin Karimineghlani
      Parvin Karimineghlani
      Department of Materials Science and Engineering, Texas A&M University, 3003 TAMU, 209 Reed McDonald, College Station, Texas 77843-3003, United States
      More by Parvin Karimineghlani
    • Anbazhagan Palanisamy
      Anbazhagan Palanisamy
      Department of Materials Science and Engineering, Texas A&M University, 3003 TAMU, 209 Reed McDonald, College Station, Texas 77843-3003, United States
      More by Anbazhagan Palanisamy
      Orcidhttp://orcid.org/0000-0002-8366-3330
    • Svetlana A. Sukhishvili*
      Svetlana A. Sukhishvili
      Department of Materials Science and Engineering, Texas A&M University, 3003 TAMU, 209 Reed McDonald, College Station, Texas 77843-3003, United States
      *E-mail: [email protected]. Phone: 979 458 9840. Fax: 979 862 6835.
      More by Svetlana A. Sukhishvili
      Orcidhttp://orcid.org/0000-0002-2328-4494
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    ACS Applied Materials & Interfaces

    Cite this: ACS Appl. Mater. Interfaces 2018, 10, 17, 14786–14795
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    https://doi.org/10.1021/acsami.8b03080
    Published April 10, 2018
    Copyright © 2018 American Chemical Society
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    Abstract

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    Chemically cross-linked polymer matrices have demonstrated strong potential for shape stabilization of molten phase change materials (PCM). However, they are not designed to be fillable and removable from a heat exchange module for an easy replacement with new PCM matrices and lack self-healing capability. Here, a new category of shapeable, self-healing gels, “salogels”, is introduced. The salogels reversibly disassemble in a high-salinity environment of a fluid inorganic PCM [lithium nitrate trihydrate (LNH)], at a preprogrammed temperature. LNH was employed as a high latent heat PCM and simultaneously as a solvent, which supported the formation of a network of polyvinyl alcohol (PVA) chains via physical cross-linking through poly(amidoamine) dendrimers of various generations. The existence of hydrogen bonding and the importance of low-hydration state of PVA for the efficient gelation were experimentally confirmed. The thermal behavior of PCM salogels was highly reversible and repeatable during multiple heating/cooling cycles. Importantly, the gel–sol transition temperature could be precisely controlled within a range of temperature above LNH’s melting point by the choice of dendrimer generation and their concentration. Shape stabilization and self-healing properties of the salogels, taken together with tunability of their temperature-induced fluidization make these materials attractive for thermal energy storage applications that require on-demand removal and replacement of used inorganic PCM salt hydrates.

    Copyright © 2018 American Chemical Society

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    Supporting Information

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    The Supporting Information is available free of charge on the ACS Publications website at DOI: 10.1021/acsami.8b03080.

    • Viscometry studies of PVA/LNH solutions, comparative rheological studies of PVA solutions in water and LNH, FTIR data of PVA in LNH/water mixtures of varied ratios in a wide spectral range, rheological experiments in the PVA/G3/LNH system with varied concentrations of G3, and 1H NMR characterization of the dendrimers (PDF)

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    ACS Applied Materials & Interfaces

    Cite this: ACS Appl. Mater. Interfaces 2018, 10, 17, 14786–14795
    Click to copy citationCitation copied!
    https://doi.org/10.1021/acsami.8b03080
    Published April 10, 2018
    Copyright © 2018 American Chemical Society
    Request reuse permissions

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