Phase-Change Microcapsules with a Stable Polyurethane Shell through the Direct Crosslinking of Cellulose Nanocrystals with Polyisocyanate at the Oil/Water Interface of Pickering Emulsion

Voronin, Denis, Mendgaziev, Rais, Sayfutdinova, Adeliya, Kugai, Maria, Rubtsova, Maria, Cherednichenko, Kirill, Shchukin, Dmitry ORCID: 0000-0002-2936-804X and Vinokurov, Vladimir (2023) Phase-Change Microcapsules with a Stable Polyurethane Shell through the Direct Crosslinking of Cellulose Nanocrystals with Polyisocyanate at the Oil/Water Interface of Pickering Emulsion. MATERIALS, 16 (1). 29-. ISSN 1996-1944, 1996-1944

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Abstract

Phase-change materials (PCMs) attract much attention with regard to their capability of mitigating fossil fuel-based heating in in-building applications, due to the responsive accumulation and release of thermal energy as a latent heat of reversible phase transitions. Organic PCMs possess high latent heat storage capacity and thermal reliability. However, bare PCMs suffer from leakages in the liquid form. Here, we demonstrate a reliable approach to improve the shape stability of organic PCM <i>n</i>-octadecane by encapsulation via interfacial polymerization at an oil/water interface of Pickering emulsion. Cellulose nanocrystals are employed as emulsion stabilizers and branched oligo-polyol with high functionality to crosslink the polyurethane shell in reaction with polyisocyanate dissolved in the oil core. This gives rise to a rigid polyurethane structure with a high density of urethane groups. The formation of a polyurethane shell and successful encapsulation of <i>n</i>-octadecane is confirmed by FTIR spectroscopy, XRD analysis, and fluorescent confocal microscopy. Electron microscopy reveals the formation of non-aggregated capsules with an average size of 18.6 µm and a smooth uniform shell with the thickness of 450 nm. The capsules demonstrate a latent heat storage capacity of 79 J/g, while the encapsulation of <i>n</i>-octadecane greatly improves its shape and thermal stability compared with bulk paraffin.

Item Type:	Article
Uncontrolled Keywords:	phase-change materials, n-octadecane, latent heat storage, nanocrystalline cellulose, interfacial polymerization, branched oligo-polyol, rigid polyurethane
Divisions:	Faculty of Science and Engineering > School of Physical Sciences
Depositing User:	Symplectic Admin
Date Deposited:	22 Feb 2023 15:52
Last Modified:	06 Dec 2024 20:12
DOI:	10.3390/ma16010029
Open Access URL:	https://doi.org/10.3390/ma16010029
Related URLs:	Author Publisher
URI:	https://livrepository.liverpool.ac.uk/id/eprint/3168562