Chairopoulou, Makrina A., García-Triñanes, Pablo ORCID: 0000-0002-4993-2250 and Teipel, Ulrich (2022) Oyster shell reuse: a particle engineering perspective for the use as emulsion stabilizers. Powder Technology, 408:117721. ISSN 0032-5910 (Print), 1873-328X (Online) (doi:https://doi.org/10.1016/j.powtec.2022.117721)

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Abstract

Oyster shells are an important bioresource that causes serious environmental problems and is currently only partially repurposed. Its versatile nature is reflected in the manifold studies already proposed for the material. In this study, we add to this effort by first grinding the material with a hammer mill, beater disc mill, pin mill and wet media mill, treating part of it in a muffle furnace, noting the shift in its properties such as particle size, morphology, surface free energy, specific surface area and choosing a fraction to incorporate in a particle stabilized emulsion. The particle stabilized emulsions were prepared with oyster shells grinded by the agitated wet media mill at 2000 rpm for 30 min, with a media at x50 = 0.79 μm, a SSA at 17.16 m2/g, a SFE at 32.53 mN/m and with particles resembling a spherical shape. The emulsion was studied in terms of particle concentration, ranging from 2 to 10 wt% with the 8 wt% showing the best stability. The 8 wt% oyster shell formulation was tested and compared with a formulation using 2 wt% Aerosil particles and a surfactant store-bought product. The oyster shell particle formulation exhibited minor viscosity changes in the studied period of 8 weeks, a constant LVE range and promising behaviour in the proposed application.

Item Type:	Article
Uncontrolled Keywords:	oyster shells; biomaterials; recycling; pickering emulsions; particle engineering
Subjects:	Q Science > QD Chemistry T Technology > TP Chemical technology
Faculty / School / Research Centre / Research Group:	Faculty of Engineering & Science Faculty of Engineering & Science > School of Engineering (ENG)
Last Modified:	25 Jul 2022 08:48
URI:	http://gala.gre.ac.uk/id/eprint/37049

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