Interaction of imidazolium based ionic liquids with Triton X-100 micelles: investigating the role of the counter ion and chain length

Thakkar, Khushbu; Patel, Vipul M.; Ray, Debes; Pal, Haridas; Aswal, Vinod K.; Bahadur, Pratap

doi:10.1039/c6ra03086f

Cited by 38 publications

(9 citation statements)

References 82 publications

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“…Another sample studied in this same manner showed the same results. These findings correlate well with the literature data on the adsorption of surfactants on hydrophobic surfaces. − Aqueous dispersions of nanocapsules investigated here were stabilized by Triton X-100 without removal of the inner surfactant layer. Under these conditions, one may expect a single layer of Triton X-100 outside and a single layer of residual SDBS/CTAT mixture on the inside of the shell.…”

supporting

confidence: 91%

Unraveling the Single-Nanometer Thickness of Shells of Vesicle-Templated Polymer Nanocapsules

Richter

Dergunov

Kim

et al. 2017

J. Phys. Chem. Lett.

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Vesicle-templated nanocapsules have emerged as a viable platform for diverse applications. Shell thickness is a critical structural parameter of nanocapsules, where the shell plays a crucial role providing mechanical stability and control of permeability. Here we used small-angle neutron scattering (SANS) to determine the thickness of freestanding and surfactant-stabilized nanocapsules. Despite being at the edge of detectability, we were able to show the polymer shell thickness to be typically 1.0 ± 0.1 nm, which places vesicle-templated nanocapsules among the thinnest materials ever created. The extreme thinness of the shells has implications for several areas: mass-transport through nanopores is relatively unimpeded; pore-forming molecules are not limited to those spanning the entire bilayer; the internal volume of the capsules is maximized; and insight has been gained on how polymerization occurs in the confined geometry of a bilayer scaffold, being predominantly located at the phase-separated layer of monomers and cross-linkers between the surfactant leaflets.

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supporting

confidence: 91%

Unraveling the Single-Nanometer Thickness of Shells of Vesicle-Templated Polymer Nanocapsules

Richter

Dergunov

Kim

et al. 2017

J. Phys. Chem. Lett.

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“…Reproducibility of measurements among multiple independently prepared samples suggested that the thickness of the surfactant layer remained constant under a specific preparation protocol and was reflective of the density of surfactants on the surface of the shells. The contribution to the total thickness due to adsorbed surfactants was in good agreement with literature data reporting the thickness of surfactant layers adsorbed on flat surfaces. − In the data presented below, however, we chose not to subtract the thickness of the surfactant layer from the total thickness of the surfactant-supported shells so as to minimize processing the results and avoid introducing larger uncertainties.…”

Section: Resultssupporting

confidence: 77%

Deciphering and Controlling Structural and Functional Parameters of the Shells in Vesicle-Templated Polymer Nanocapsules

et al. 2019

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Vesicle-templated nanocapsules are prepared by polymerization of hydrophobic acrylic monomers and cross-linkers in the hydrophobic interior of self-assembled bilayers. Understanding the mechanism of capsule formation and the influence of synthetic parameters on the structural features and functional performance of nanocapsules is critical for the rational design of functional nanodevices, an emerging trend of application of the nanocapsule platform. This study investigated the relationship between basic parameters of the formulation and synthesis of nanocapsules and structural and functional characteristics of the resulting structures. Variations in the monomer/surfactant ratio, temperature of polymerization, and the molar fraction of the free-radical initiators were investigated with a multipronged approach, including shell thickness measurements using small-angle neutron scattering, evaluation of the structural integrity of nanocapsules with scanning electron microscopy, and determination of the retention of entrapped molecules using absorbance and fluorescence spectroscopy. Surprisingly, the thickness of the shells did not correlate with the monomer/surfactant ratio, supporting the hypothesis of substantial stabilization of the surfactant bilayer with loaded monomers. Decreasing the temperature of polymerization had no effect on the spherical structure of nanocapsules but resulted in progressively lower retention of entrapped molecules, suggesting that a spherical skeleton of nanocapsule forms rapidly, followed by filling the gaps to create the structure without pinholes. Lower content of initiators resulted in slower reactions, outlining the baseline conditions for practical synthetic protocols. Taken together, these findings provide insights into the formation of nanocapsules and offer methods for controlling the properties of nanocapsules in viable synthetic methods.

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“…[C 12 mim]Cl and [C 10 mim]Cl are amphiphilic organic cations (with a long alkyl chain attached to an aromatic ring) associated with a small inorganic anion, and, because of their surfactant-like structures, it is expected that, when these ILs are mixed with aqueous solutions, they will form micelles and exhibit selfassembling behavior [31]. Thakkar and collaborators [37] demonstrated that [C 10 mim]Cl penetrates deeper into the Triton X-100 micellar core as a result of the long imidazolium alkyl chain. This phenomenon probably occurs when imidazolium-based ILs with long alkyl In all the systems, increasing the concentration of Triton X-114 led to high T cp values.…”

Section: Effects Of the Ils On The Binodal Curvesmentioning

confidence: 99%

Imidazolium-based ionic liquids as co-surfactants in aqueous micellar two-phase systems composed of nonionic surfactants and their aptitude for recovery of natural colorants from fermented broth

Torres

Francisco

Pereira

et al. 2018

Separation and Purification Technology

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A B S T R A C TOver the last few years, synthetic colorants have been increasingly replaced by natural alternatives that cause fewer adverse health effects and can show biological activity. These biocompounds can be produced by fermentative processes using microorganisms such as bacteria and filamentous fungi. However, the biocompounds must be extracted from the fermented broth before industrial application. Thus, the development of effective techniques for the extraction and purification of biocolorants with high recovery is of great interest. The main goal of this study was to evaluate the recovery of natural colorants produced by Talaromyces amestolkiae using aqueous micellar two-phase system (AMTPS) composed of Triton X-114 and Ionic Liquids (ILs) from the imidazolium family as co-surfactants. Preliminary experiments were performed to determine the binodal curves in both presence and absence of fermented broth containing the red colorants. Subsequently, a set of partitioning experiments was performed using the developed systems. Under all conditions, the red colorants were partitioned mainly into the micelle-rich phase. The systems with low concentrations of Triton X-114 and ILs showed high partition coefficients. The system (0.1 wt% [C 10 mim]Cl + 3 wt% Triton X-114) with the highest partition coefficient (K RC = 6.12) was used to study the effect of temperature on partitioning. The partitioning of the red colorants was strongly influenced by the temperature, and K RC increased to 24.71 at 45°C. The results of this study demonstrate that the partitioning of biomolecules can be controlled by the presence of ILs, mainly by electrostatic interactions, or by the proper adjustment of the partitioning temperature.

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Interaction of imidazolium based ionic liquids with Triton X-100 micelles: investigating the role of the counter ion and chain length

Abstract: Size and shape of Triton X-100 micelles can easily be controlled by the appropriate selection of ionic liquids with varying hydrophobicity.

Cited by 38 publications

References 82 publications

Unraveling the Single-Nanometer Thickness of Shells of Vesicle-Templated Polymer Nanocapsules

Unraveling the Single-Nanometer Thickness of Shells of Vesicle-Templated Polymer Nanocapsules

Deciphering and Controlling Structural and Functional Parameters of the Shells in Vesicle-Templated Polymer Nanocapsules

Imidazolium-based ionic liquids as co-surfactants in aqueous micellar two-phase systems composed of nonionic surfactants and their aptitude for recovery of natural colorants from fermented broth

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