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Design of nanoengineered hybrid PVA/PNIPAm/CaCl2/SiO2-Polystyrene (PSt) colloidal crystal hydrogel coatings that sweat/rehydrate H2O from the atmosphere to give sustainable cooling and self-indicate their state
Author(s): Jean-Charles Eloi; Myles P. Worsley; Paul A. Sermon; William Healy; Christine Dimech
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Paper Abstract

The potential for nanoengineering hybrid PVA hydrogel and hydrogel microsphere optical coatings is demonstrated with fine-tuning by the addition of (i) PNIPAm domains, (ii) water-hunting humectant CaCl2, and (ii) polystyrene or SiO2 colloidal crystals. The design and application onto substrates of the hydrogel scaffold is described. The addition of a temperature-triggered component as well as humectant and NIR reflectors are reported. The hybrid hydrogels appeared effective in sustainable adsorption cooling technology (ACT) over sustained periods. It is shown that the thermoresponsive (PNIPAm) domains act as an extra reserve, sweating water above 305K, prolonging the controlled release of water. It is also reported that the addition of humectant is crucial for the natural re-hydration of the hydrogels. For the moment PNIPAm microspheres have only short- lived ACT properties. Finally, coating with microspheres (MSs) in hydrogels produces a visible-NIR reflector effect that may allow optical feedback on ACT.

Paper Details

Date Published: 16 September 2016
PDF: 12 pages
Proc. SPIE 9919, Nanophotonic Materials XIII, 99190V (16 September 2016); doi: 10.1117/12.2237561
Show Author Affiliations
Jean-Charles Eloi, Brunel Univ. (United Kingdom)
Myles P. Worsley, Brunel Univ. (United Kingdom)
Paul A. Sermon, Brunel Univ. (United Kingdom)
William Healy, Defence Science and Technology Lab. (United Kingdom)
Christine Dimech, Defence Science and Technology Lab. (United Kingdom)

Published in SPIE Proceedings Vol. 9919:
Nanophotonic Materials XIII
Stefano Cabrini; Gilles Lérondel; Adam M. Schwartzberg; Taleb Mokari, Editor(s)

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