Interaction between the ionic liquids 1-alkyl-3-methylimidazolium tetrafluoroborate and Pluronic® P103 in aqueous solution: A DLS, SANS and NMR study

Parmar, Arpan; Aswal, Vinod K.; Bahadur, Pratap

doi:10.1016/j.saa.2012.05.075

Cited by 47 publications

(27 citation statements)

References 37 publications

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“…2a; Supplementary Table 1). Although micellar size usually increases after encapsulation of organic molecules39, incorporation of hydrophobic molecules can result in expulsion of water from the micelles, causing a contraction40. The hydrophobicity of 1 probably results in a stronger folding of the poly(ethylene oxide) chains around the complex through hydrophobic interactions, with concomitant expulsion of water from the core.…”

Section: Methodsmentioning

confidence: 99%

Fabrication of crystals from single metal atoms

et al. 2014

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Metal nanocrystals offer new concepts for the design of nanodevices with a range of potential applications. Currently the formation of metal nanocrystals cannot be controlled at the level of individual atoms. Here we describe a new general method for the fabrication of multi-heteroatom-doped graphitic matrices decorated with very small, ångström-sized, three-dimensional (3D)-metal crystals of defined size. We irradiate boron-rich precious-metal-encapsulated self-spreading polymer micelles with electrons and produce, in real time, a doped graphitic support on which individual osmium atoms hop and migrate to form 3D-nanocrystals, as small as 15 Å in diameter, within 1 h. Crystal growth can be observed, quantified and controlled in real time. We also synthesize the first examples of mixed ruthenium–osmium 3D-nanocrystals. This technology not only allows the production of ångström-sized homo- and hetero-crystals, but also provides new experimental insight into the dynamics of nanocrystals and pathways for their assembly from single atoms.

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Section: Methodsmentioning

confidence: 99%

Fabrication of crystals from single metal atoms

et al. 2014

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“…For C 12 mimBF 4 , two well-distinguished peaks in the size ranges 171.0-477.7 and 1790-2780 nm are observed at the CMC (0.59 9 10 -2 mmol/L). This must be attributed to the presence of large agglomerates [41,42]. In C 12 mimBF 4 aqueous solutions with greater hydrophobicity, the formed micelles begin to aggregate into clusters, resulting in a second peak of low intensity in the higher-size range [34].…”

Section: Dynamic Light Scattering Analysis Of the Ionic Liquid Solutionsmentioning

confidence: 99%

“…Finally, the standard entropy change during the micelle formation, DS o m , is calculated [42] using the following Eq. (11):…”

Section: Thermodynamics Of Micellizationmentioning

confidence: 99%

Synthesis, Characterization, Surface Properties and Micellization Behaviour of Imidazolium‐based Ionic Liquids

Pillai

Pal

2017

J Surfact & Detergents

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Ionic liquids (IL) have emerged as a prospective new material for a wide range of industrial applications, owing to their unique structures and properties. Hence, understanding the structure–property relationships of IL is very important for both fundamental and industrial applications. In this study, a series of imidazolium‐based IL with different chain lengths, namely C8mimBF4, C10mimBF4 and C12mimBF4, were synthesized. Their molecular structures were confirmed by proton nuclear magnetic resonance (1H NMR) and Fourier transform infrared (FTIR) analysis. Thermal gravimetric analysis (TGA) revealed that the IL synthesized were thermally stable in the desired temperature range. Dynamic light scattering (DLS) results of IL was analyzed in order to understand the effect of alkyl length on micellar size. Conductivity and surface tension measurements were carried out to determine the adsorption and aggregation characteristics in aqueous solutions. The influences of temperature as well as alkyl chain length on viscosity were also investigated. Surface adsorption parameters such as surface excess, minimum area, effectiveness and efficiency were also determined from equilibrium surface tension data. A careful analysis of the thermodynamic aspects of air‐ionic liquid aqueous systems reveals that free energies of adsorption are favoured over micellization for all systems.

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“…(6.35), using the appropriate form factor [28] and structure factor [65]. Using this approach, one can obtain the micelle size, hard sphere radius, chain aggregation number, and chain size [66]. However, this is not always possible because of the limited q-range available-a problem that is sometimes unavoidable depending on the instrument used.…”

Section: Aggregationmentioning

confidence: 99%