Protic Ionic Liquids: Evolving Structure–Property Relationships and Expanding Applications

Greaves, Tamar L.; Drummond, Calum J.

doi:10.1021/acs.chemrev.5b00158

Cited by 751 publications

(553 citation statements)

References 642 publications

(1,806 reference statements)

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“…21,22 Moreover, the introduction of branched poly(ionic liquid)s with tuned amphiphilicity will have effect on the fine tuning and control of PILs-based nanostructured porous carbon materials for energy storage materials. 2325 This research is supported by the NSF DMR 1505234 and CBET 1402712 projects.…”

Section: Vol 90 Commemorative Paper: Self-organizationmentioning

confidence: 99%

Self-Assembly of Hyperbranched Protic Poly(ionic liquid)s with Variable Peripheral Amphiphilicity

Korolovych

Erwin

Stryutsky

et al. 2017

Bulletin of the Chemical Society of Japan

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We demonstrated that the aggregation behavior of hyperbranched amphiphilic protic poly(ionic liquid)s (HBP-ILs) can be controlled by varying not only the number of peripheral hydrophobic arms and nature of counterions. Additionally, increasing the hydrophobicity of the HBP-ILs led to a condensed monolayer phase at the air-water interface. The balance of intermolecular interactions mediated by the presence of the ionic liquid component in the inner shell of micelles determines the final morphology in solution and at interfaces.Poly(ionic liquid)s (PILs) are an emerging class of macromolecules capable of forming hierarchically structured building blocks for the bottom-up assembly of functional nanomaterials. 15 Owing to the chemical diversity of the polymerized IL functionalities, a variety of structure directing interactions can be exploited to tune the morphology and properties of the assemblies. 610 For example, by varying the length of the alkyl tails associated with imidazole component®and hence the PIL hydrophobicity®assemblies ranging from unilamellar vesicular to 'onion-like' mesostructures were observed. 1113 We have previously demonstrated that introducing complex molecular topologies (e.g., branching) is an additional avenue of influencing the supramolecular organization of PILs. For instance, it was shown that star PILs can form closely-packed monolayers at the air-water interface in contrast to their linear analogues, and that their incorporation into layer-by-layer structures can yield membranes whose nanoscale texture and porosity depend on the degree of polymerization and topology of the PILs.14 Furthermore, studies of IL-based hydroxylterminated aliphatic hyperbranched polyesters (HBP-ILs) revealed that the terminal ionic groups, counterions, and the degree of ionization (controlled by solution ionic strength or pH) defined the assembly behavior of micelles into nanoscale aggregates. 1518 Although it was established that the long hydrophobic tails have a significant influence on the size of the micelles, the effect of varying their relative ratio in the overall molecular architecture and the presence of different ionic liquid components was not explored to date.

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Section: Vol 90 Commemorative Paper: Self-organizationmentioning

confidence: 99%

Self-Assembly of Hyperbranched Protic Poly(ionic liquid)s with Variable Peripheral Amphiphilicity

Korolovych

Erwin

Stryutsky

et al. 2017

Bulletin of the Chemical Society of Japan

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“…2, and decomposition temperatures at the 90 % remaining mass point (T 90 % ) are in Table 1. It should be noted that the mass loss may not be solely due to decomposition as evaporation can also play an important role, especially in the protic IL series [43]. The protic ILs' acid-base equilibrium behavior may become more important under heating and cause an equilibrium shift resulting in the formation of more volatile species.…”

Section: Solubility and Physical Propertiesmentioning

confidence: 99%

Tertiary and Quaternary Ammonium-Phosphate Ionic Liquids as Lubricant Additives

et al. 2016

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In this work, we investigated the feasibility of five quaternary (aprotic) and four tertiary (protic) ammonium ionic liquids (ILs) with an identical organophosphate anion as lubricant anti-wear additives. Viscosity, oil solubility, thermal stability and corrosivity of the candidate ILs were characterized and correlated to the molecular structure. The protic group exhibits higher oil solubility than the aprotic group, and longer alkyl chains seem to provide better oil solubility and higher thermal stability. Selected ILs were applied as oil additives in steel-cast iron tribological tests and demonstrated promising anti-scuffing and anti-wear functionality. The thickness, nanostructure, and composition of the tribofilm formed by the best performing IL were revealed by surface characterization for mechanistic understanding of the tribochemical interactions between the IL and metal surface. Results provide fundamental insights of the correlations among the molecular structure, physiochemical properties and lubricating performance for ammonium-phosphate ILs.

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“…The fraction of ionic vs. molecular species in PILs is not easily measured, and the question of how to measure and define the ''ionicity" of a PIL remains an active area of discussion [16,17]. However, there is evidence that while absolute pKa values are different in PIL and aqueous phases, the relative pKa values of the acid and base remain the same [18].…”

Section: Introductionmentioning

confidence: 99%

Copper extraction using protic ionic liquids: Evidence of the Hofmeister effect

Janssen

Macı́as-Ruvalcaba

Aguilar-Martı́nez

et al. 2016

Separation and Purification Technology

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Protic Ionic Liquids: Evolving Structure–Property Relationships and Expanding Applications

Abstract: The activity coefficient provides a measure of the interaction between a solvent and a solute, with large values corresponding to small solute−solvent interactions. Activity coefficients for a

Cited by 751 publications

References 642 publications

Self-Assembly of Hyperbranched Protic Poly(ionic liquid)s with Variable Peripheral Amphiphilicity

Self-Assembly of Hyperbranched Protic Poly(ionic liquid)s with Variable Peripheral Amphiphilicity

Tertiary and Quaternary Ammonium-Phosphate Ionic Liquids as Lubricant Additives

Copper extraction using protic ionic liquids: Evidence of the Hofmeister effect

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