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

Jean-Charles Eloi; Myles P. Worsley; Paul A. Sermon; William Healy; Christine Dimech

doi:10.1117/12.2237561

16 September 2016 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

Jean-Charles Eloi, Myles P. Worsley, Paul A. Sermon, William Healy, Christine Dimech

Author Affiliations +

Proceedings Volume 9919, Nanophotonic Materials XIII; 99190V (2016) https://doi.org/10.1117/12.2237561
Event: SPIE Nanoscience + Engineering, 2016, San Diego, California, United States

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.

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Jean-Charles Eloi, Myles P. Worsley, Paul A. Sermon, William Healy, and Christine Dimech "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", Proc. SPIE 9919, Nanophotonic Materials XIII, 99190V (16 September 2016); https://doi.org/10.1117/12.2237561

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