Phosphomolybdic acid-responsive Pickering emulsions stabilized by ionic liquid functionalized Janus nanosheets



Meng, Qing Bo, Yang, Peng, Feng, Tianyang, Ji, Xuyang, Zhang, Qian, Liu, Daliang, Wu, Shuyao, Liang, Fuxin, Zheng, Zhaoliang ORCID: 0000-0001-6741-6148 and Song, Xi-Ming
(2017) Phosphomolybdic acid-responsive Pickering emulsions stabilized by ionic liquid functionalized Janus nanosheets. JOURNAL OF COLLOID AND INTERFACE SCIENCE, 507. pp. 74-82.

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Abstract

A type of ionic liquid functionalized high-aspect-ratio Janus SiO<sub>2</sub> nanosheets (IL-Janus nanosheets), which possesses a side terminated by imidazolin salt groups and the opposite side terminated by phenyl groups, was prepared and its emulsification performance was investigated. The surface wettability of ionic liquid functionalized side could be tailored via simple anion exchanging, giving the amphiphilic or totally hydrophobic Janus nanosheets. The influence of several parameters including surface wettability, particle concentration, oil composition, oil-water ratio as well as initial location of the nanosheets on the stability, morphology and type of the Pickering emulsions (O/W or W/O) stabilized by the amphiphilic IL-Janus nanosheets was evaluated. The research results revealed that average emulsion droplets size was decreased with increase of nanosheets concentration below a concentration value but had almost no change beyond the concentration; catastrophic phase inversion phenomenon occurred by varying volume fraction of water phase in the oil-water systems, and transitional phase inversion could be achieved by in-situ exchanging Cl<sup>-</sup> anion of the IL-Janus nanosheets with phosphomolybdate H<sub>2</sub>PMo<sub>12</sub>O<sub>40</sub><sup>-</sup>. The responsiveness of Pickering emulsions towards phosphomolybdic acid is resulted from irreversible anion exchanging of Cl<sup>-</sup> by H<sub>2</sub>PMo<sub>12</sub>O<sub>40</sub><sup>-</sup> and the variation of surface wettability of the nanosheets.

Item Type: Article
Uncontrolled Keywords: Janus nanosheet, Pickering emulsion, Ionic liquid, Phase inversion, Phosphomolybdic acid
Depositing User: Symplectic Admin
Date Deposited: 10 Aug 2017 14:47
Last Modified: 19 Jan 2023 06:58
DOI: 10.1016/j.jcis.2017.07.097
Related URLs:
URI: https://livrepository.liverpool.ac.uk/id/eprint/3008899