Facile in situ synthesis of nanofluids based on ionic liquids and copper oxide clusters and nanoparticles |
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Authors: | Swadźba-Kwaśny Małgorzata Chancelier Léa Ng Shieling Manyar Haresh G Hardacre Christopher Nockemann Peter |
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Institution: | QUILL/School of Chemistry and Chemical Engineering, The Queen's University of Belfast, Belfast, BT9 5AG, United Kingdom. m.swadzba-kwasny@qub.ac.uk |
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Abstract: | Two stable nanofluids comprising of mixed valent copper(I,II) oxide clusters (<1 nm) suspended in 1-butyl-3-methylimidazolium acetate, C(4)mim]OAc], and copper(II) oxide nanoparticles (<50 nm) suspended in trioctyl(dodecyl)phosphonium acetate, P(8 8 8 12)]OAc], were synthesised in a facile one-pot reaction from solutions of copper(II) acetate hydrate in the corresponding ionic liquids. Formation of the nanostructures was studied using (13)C NMR spectroscopy and differential scanning calorimetry (DSC). From a solution of Cu(OAc)(2) in 1-ethyl-3-methylimidazolium acetate, C(2)mim]OAc], crystals were obtained that revealed the structure of C(2)mim]Cu(3)(OAc)(5)(OH)(2)(H(2)O)]·H(2)O, indicating the formation of copper hydroxo-clusters in the course of the reaction. Synthesised nanostructures were studied using transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS). Physical properties of the prepared IL-nanofluids were examined using IR and UV-VIS spectroscopy, thermogravimetric analysis (TGA), differential scanning calorimetry (DSC) and densitometry. |
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