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Encapsulation of phase change materials using rice-husk-char

Wayne Gondora, Khalid Doudin, Daniel J. Nowakowski, Bo Xiao, Yulong Ding, Tony Bridgwater and Qingchun Yuan

Applied Energy, 2016, vol. 182, issue C, 274-281

Abstract: This paper explored a new approach to prepare phase change microcapsules using carbon-based particles via Pickering emulsions for energy storage applications. Rice-husk-char, a by-product in biofuel production, containing 53.58wt% of carbon was used as a model carbon-based material to encapsulate hexadecane. As a model phase change material, hexadecane was emulsified in aqueous suspensions of rice-husk-char nanoparticles. Water soluble polymers poly(diallyldimethyl-ammonium chloride) and poly(sodium styrene sulfonate) were used to fix the rice-husk-char nanoparticles on the emulsion droplets through layer-by-layer assembly to enhance the structural stability of the microcapsules. The microcapsules formed are composed of a thin shell encompassing a large core consisting of hexadecane. Thermal gravimetrical and differential scanning calorimeter analyses showed the phase change enthalpy of 80.9kJkg−1 or 120.0MJm−3. Design criteria of phase change microcapsules and preparation considerations were discussed in terms of desired applications. This work demonstrated possible utilisations of biomass-originated carbon-based material for thermal energy recovery and storage applications, which can be a new route of carbon capture and utilisation.

Keywords: Thermal energy storage; Phase change microcapsules; Rice husk char; Pickering emulsion; Layer-by-layer assembly (search for similar items in EconPapers)
Date: 2016
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