Small-angle X-ray scattering study on nano-scale structures controlled by water content in a binary water/ionic liquid system

Hashimoto, Kei; Fujii, Kenta; Kusano, Takumi; Hirosawa, Kazu; Shibayama, Mitsuhiro

doi:10.1039/c8cp00440d

Cited by 6 publications

(1 citation statement)

References 48 publications

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“…As can be seen from Figure , the scattering curves [the absolute scattering intensity I ( q ) vs the scattering vector q ] obtained at different α values are similar, and with the increase in α, the broad scattering peak shifts gradually to the right, that is, the q max value becomes larger. The shoulder on the right side of the scattering curve originates from the substructure of pure IL. − Via the Teubner–Strey (T–S) model fitting, the parameters d , ξ, and f a of the microstructure formed by the surfactant aggregates were obtained and are summarized in Table , where d is the mean repeat distance of the HIL and water domains, ξ is the correlation length, and f a is the amphiphilicity factor.…”

Section: Results and Discussionmentioning

confidence: 99%

Anionic-Surfactant-Stabilized Hydrophobic Ionic-Liquid-Based Bicontinuous Microemulsion as a Medium for Enzymatic Oxidative Polymerization of Aniline

Wang

Huang

2021

ACS Omega

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The hydrophobic ionic liquid [C8mim][PF6] (1-octyl-3-methylimidazolium hexafluorophosphate)-based bicontinuous microemulsion stabilized by the anionic surfactant [C4mim][AOT] (1-butyl-3-methylimidazolium bis(2-ethylhexyl) sulfosuccinate) was first tried as a medium for horseradish peroxidase (HRP)-triggered oxidative polymerization of aniline. The effects of the mass ratio of [C8mim][PF6]-to-water (α), the mass fraction of [C4mim][AOT] in the total mixture (γ), and temperature (T) on the enzymatic polymerization were investigated using UV–vis–NIR absorption, electron spin resonance, and small-angle X-ray scattering spectroscopy techniques. The bicontinuous microemulsion is demonstrated to play a template role in the biosynthesis of polyaniline (PANI). The conductivity of the resulting PANI depends on the microemulsion microstructure and the microstructure- and T-dependent catalytic properties of the solubilized HRP. With the increase in α, the conductivity of the synthesized PANI decreases due to the increase in the template curvature (decrease of the microdomain size) and the decrease in the activity and stability of HRP. Compared with α, γ has little effect on the microdomain size of the template; so, the γ-dependent change in the conductivity of PANI is mainly caused by the changes of the microstructure-dependent activity and stability of HRP. Over the range of 20–35 °C, T has little effect on the microdomain size, but it greatly changes the activity and stability of HRP. With the increase in T, the activity of HRP increases steadily, but its stability decreases significantly, which should be one of the reasons why the conductivity of PANI decreases with increasing T. In conclusion, lower values of α, γ, and T are favorable for the biosynthesis of conductive PANI. The present study not only deepens the insight into the role of the template in the process of PANI synthesis, but also opens up a green new way for the biosynthesis of the conducting polymer.

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Section: Results and Discussionmentioning

confidence: 99%

Anionic-Surfactant-Stabilized Hydrophobic Ionic-Liquid-Based Bicontinuous Microemulsion as a Medium for Enzymatic Oxidative Polymerization of Aniline

Wang

Huang

2021

ACS Omega

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Special Mixing Behavior of Chelate‐based Ionic Liquid with Methanol

et al. 2021

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Compared to the general ionic liquids (ILs), a significant deviation of the binary mixtures of 1-decyl-3-methylimidazolium tri(hexafluoroacetylaceto)-copper(II) ([C 10 mim][Cu(hfacac) 3 ]) with methanol was found, indicating the way methanol interacts with ILs might be governed by the special structure of the chelating anion. IR results showed that the v(C2-H) of 1-decyl-3-methylimidazolium hexafluoroacetylacetonate ([C 10 mim][hfacac]) blue-shifted more significantly than that of [C 10 mim][Cu(hfacac) 3 ], meanwhile the v(C=O) red-shifted in [C 10 mim][Cu(hfacac) 3 ], which is contrast with that in [C 10 mim][hfacac]. Two-dimensional correlation analysis of the FTIR spectra indicated that the chelating cavity has little effect on the sequence of the ILs sites that interact with methanol. Combined with small angle X-ray scattering (SAXS) results, the picture of mixing processes in these two systems were proposed. Methanol interacts directly with the anion followed by the cation in [C 10 mim][hfacac], while methanol preferentially enters the chelating cavity and enhances the packing effect in the [C 10 mim][Cu(hfacac) 3 ] system.

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Applications of small-angle X-ray scattering/small-angle neutron scattering and cryogenic transmission electron microscopy to understand self-assembly of surfactants

Fan

Wang

2019

Current Opinion in Colloid & Interface Science

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Small-angle X-ray scattering study on nano-scale structures controlled by water content in a binary water/ionic liquid system

Cited by 6 publications

References 48 publications

Anionic-Surfactant-Stabilized Hydrophobic Ionic-Liquid-Based Bicontinuous Microemulsion as a Medium for Enzymatic Oxidative Polymerization of Aniline

Anionic-Surfactant-Stabilized Hydrophobic Ionic-Liquid-Based Bicontinuous Microemulsion as a Medium for Enzymatic Oxidative Polymerization of Aniline

Special Mixing Behavior of Chelate‐based Ionic Liquid with Methanol

Applications of small-angle X-ray scattering/small-angle neutron scattering and cryogenic transmission electron microscopy to understand self-assembly of surfactants

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