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How surfactant-decorated nanoparticles contribute to thermodynamic miscibility

Zhang, Kaiqiang, Jia, Na, Li, Songyan and Liu, Lirong (2018) How surfactant-decorated nanoparticles contribute to thermodynamic miscibility Nanotechnology, 29 (47), 475701.

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In this study, mineral oil–water fluid miscibility without and with the addition of surfactant-decorated nanoparticles is experimentally and theoretically studied. First, three series of interfacial tension (IFT) tests are conducted using a spinning drop tensiometer (SDT) with the addition of hexadecyltrimethylammonium bromide (CTAB) surfactant-decorated SiO2 nanoparticles at different concentrations. Second, a new comprehensive thermodynamic model is developed to describe the fluid miscibility without and with the addition of these surfactant-decorated nanoparticles, which is also applied theoretically to reveal how the surfactant-decorated nanoparticles contribute to the thermodynamic miscibility state. The thermodynamic model developed is proven to be accurate and physically meaningful by comparing its calculated free energy of mixing with the experimental results and examples from the literature. A series of optimum conditions for the improvement of fluid miscibility by the addition of such surfactant-decorated nanoparticles are determined: a lower temperature, a higher pressure, more wetting conditions, a smaller nanoparticle radius (r NP < 40 nm), a larger surfactant concentration, and a nanoparticle concentration in the range of 0.5–0.6 wt.%. It should be noted that a higher nanoparticle concentration is required with the addition of more CTAB surfactants in order to reach the most miscible state. Moreover, the effect of surfactant concentration on the miscibility development is found to be independent of the nanoparticle radius, whereas the optimum nanoparticle concentration is reduced with increasing particle size.

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Centre for Environment and Sustainability
Authors :
Zhang, Kaiqiang
Jia, Na
Li, Songyan
Date : 25 September 2018
Funders : Petroleum Systems Engineering at the University of Regina, National Key Basic Research Program of China, National Key Scientific and Technological Project for the Oil & Gas Field and Coalbed Methane of China, Fundamental Research Funds for the Central Universities
DOI : 10.1088/1361-6528/aadb1d
Grant Title : National Key Basic Research Program of China
Copyright Disclaimer : © 2018 IOP Publishing Ltd
Uncontrolled Keywords : fluid miscibility; nanoparticles; surfactant; thermodynamic model
Additional Information : Embargo OK Metadata OK No Further Action
Depositing User : James Marshall
Date Deposited : 23 Jul 2020 09:18
Last Modified : 23 Jul 2020 09:18

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