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Nanoparticle-induced ion-sensitive reduction in decane-water interfacial tension

Abstract

The synergistic effect of ions and nanoparticles on the interfacial tension is of great significance for extensive applications in interface-related industrial processes. However, its mechanisms are still unclear owing to a lack of understanding for the interaction between nanoparticles/ions at the interface. Here we employ molecular dynamics method to explore the synergistic effect of ions and nanoparticles on reducing the decane-water interfacial tension and reveal the dominant role of three-phase contact angle and interaction between nanoparticles. The results show that the reduction of interfacial tension is sensitive to cation species and temperature. The stronger hydration of cations induces an increased three-phase contact angle, weakening the interaction between nanoparticles and water molecules at the interface. Hence, the virial term of interfacial tension decreases. Meanwhile, the potential of mean force between nanoparticles at the interface indicates that the order of interaction strength between nanoparticles for different cations is Ca2+ > Mg2+ > Na+. The strong interaction between nanoparticles restricts the motion of nanoparticles and water molecules at the interface, inducing a reduced kinetic energy term of interfacial tension. Therefore, interfacial tension decreases after adding nanoparticles. Besides, as temperature rises, the difference in the adsorption ability of nanoparticles on water molecules causes a falling interfacial tension with a characteristic of stage.

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Publication details

The article was received on 26 Jun 2018, accepted on 07 Aug 2018 and first published on 08 Aug 2018


Article type: Paper
DOI: 10.1039/C8CP04041A
Citation: Phys. Chem. Chem. Phys., 2018, Accepted Manuscript
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    Nanoparticle-induced ion-sensitive reduction in decane-water interfacial tension

    B. Wen, C. Sun and B. Bai, Phys. Chem. Chem. Phys., 2018, Accepted Manuscript , DOI: 10.1039/C8CP04041A

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