Showing papers on "Ionic liquid published in 2020"
TL;DR: Based on a zwitterionic poly(ionic liquid) (PIL), an anti-freezing hydrogel was designed and synthesized for use in a multimodal artificial skin this article.
Abstract: Capable of converting stimuli into electrical signals, hydrogel-based ionic devices are of great significance in soft robots, wearable devices, and artificial sensors. However, profound challenges remain in developing ionic devices that retain their properties in extreme environmental conditions, such as subzero temperatures. Based on a zwitterionic poly(ionic liquid) (PIL), an anti-freezing hydrogel was designed and synthesized for use in a multimodal artificial skin. This zwitterionic PIL hydrogel exhibited super-stretchability (approximately 900%), self-healing ability, and high conductivity (−1.1 S m−1), even at low temperature (−20 °C). Based on this zwitterionic PIL hydrogel, three sensing modes, capacitive, resistive, and triboelectric modes, can be achieved in one device, which is stable under a wide temperature range (−20 °C to 60 °C). Further applications of these multimodal sensors with a soft robotic gripper suggested a new approach for developing sophisticated stimuli-responsive skin with multifunctionality and adaptability to varied environmental conditions.
237 citations
TL;DR: In this article, a magnetically recyclable solid catalyst was developed for the transformation of low-cost oils to biodiesel via simultaneous transesterification and esterification in an efficient and environmentally benign manner.
210 citations
TL;DR: In this paper, the authors divide the acidic deep eutectic solvents (ADES) into two types, namely, Bronsted and Lewis DES, according to their diversity of acidic character.
197 citations
05 Feb 2020
TL;DR: In this paper, the authors used a hydrogen-bond topological network as the design principle to construct an ionic gel material based on cellulose, ionic liquid, and H2O.
Abstract: Summary Design of polymeric networks with unique structural motifs can permit dynamic features, yet most existing material systems exhibit limited operational states or irreversible responsiveness. Here, we use a hydrogen-bond topological network as the design principle to construct an ionic gel material based on cellulose, ionic liquid, and H2O (designated as Cel-IL dynamic gel). The prepared Cel-IL dynamic gels exhibit tunable properties of mechanical strength, ionic conductivity, viscoelasticity, and self-healing. With limited H2O, the Cel-IL dynamic gel exhibits a bramble-like Turing-pattern microstructure with excellent adhesion, rapid self-healing, and moderate ionic conductivity features. By increasing the H2O content to 32 wt %, the microstructure switched to a dense and compact Turing pattern network, giving the gel good stretchability, robust toughness, and a high ionic conductivity. With this material, we demonstrate a flexible, transparent, designable, and biocompatible ion sensor device, which exhibits great potential for use in electronic skins and intelligent devices.
175 citations
TL;DR: Values of ion dissociation for ILs and IL solutions (aqueous and nonaqueous) determined by both the traditional molar conductivity/PFG-NMR method and the ρ, η, λ method are presented.
Abstract: The extent to which cations and anions in ionic liquids (ILs) and ionic liquid solutions are dissociated is of both fundamental scientific interest and practical importance because ion dissociation has been shown to impact viscosity, density, surface tension, volatility, solubility, chemical reactivity, and many other important chemical and physical properties. When mixed with solvents, ionic liquids provide the unique opportunity to investigate ion dissociation from infinite dilution in the solvent to a completely solvent-free state, even at ambient conditions. The most common way to estimate ion dissociation in ILs and IL solutions is by comparing the molar conductivity determined from ionic conductivity measurements such as electrochemical impedance spectroscopy (EIS) (which measure the movement of only the charged, i.e., dissociated, ions) with the molar conductivity calculated from ion diffusivities measured by pulse field gradient nuclear magnetic resonance spectroscopy (PFG-NMR, which gives movement of all of the ions). Because the NMR measurements are time-consuming, the number of ILs and IL solutions investigated by this method is relatively limited. We have shown that use of the Stokes-Einstein equation with estimates of the effective ion Stokes radii allows ion dissociation to be calculated from easily measured density, viscosity, and ionic conductivity data (ρ, η, λ), which is readily available in the literature for a much larger number of pure ILs and IL solutions. Therefore, in this review, we present values of ion dissociation for ILs and IL solutions (aqueous and nonaqueous) determined by both the traditional molar conductivity/PFG-NMR method and the ρ, η, λ method. We explore the effect of cation and anion alkyl chain length, structure, and interaction motifs of the cation and anion, temperature, and the strength of the solvent in IL solutions.
161 citations
138 citations
TL;DR: In this paper, an interaction tailoring strategy for all-inorganic CsPbI3-x Brx perovskites by involving the ionic liquid solvent methylammonium acetate (MAAc) is presented.
Abstract: All-inorganic lead halide perovskites are promising candidates for optoelectronic applications. However, fundamental questions remain over the component interaction in the perovskite precursor solution due to the limitation of the most commonly used solvents of N,N-dimethylformamide (DMF) and dimethyl sulfoxide (DMSO). Here, we report an interaction tailoring strategy for all-inorganic CsPbI3-x Brx perovskites by involving the ionic liquid solvent methylammonium acetate (MAAc). C=O shows strong interaction with lead (Pb2+ ) and N-H⋅⋅⋅I hydrogen bond formation is observed. The interactions stabilize the perovskite precursor solution and allow production of the high-quality perovskite films by retarding the crystallization. Without the necessity for antisolvent treatment, the one-step air-processing approach delivers photovoltaic cells regardless of humidity, with a high efficiency of 17.10 % along with long operation stability over 1500 h under continuous light illumination.
130 citations
TL;DR: In this article, a kind of novel benzimidazole-based hyper-cross-linked poly(ionic liquid)s (HPILs) were developed via the hypercross-linking strategy and the as-prepared HPILs possessed high SBET (485-780m2/g), plentiful micro/mesoporosity, and abundant ionic active sites.
128 citations
TL;DR: In this paper, vanadium-substituted polyoxometalate-based ionic liquids with tunable electrophilicity were facilely synthesized through ion exchange method, and applied in the aerobic oxidative desulfurization.
Abstract: With increasing stringent standard of sulfur content in fuels, deep desulfurization with high-efficiency is necessary for ecological and environmental demands. Herein, vanadium-substituted polyoxometalate-based ionic liquids with tunable electrophilicity were facilely synthesized through ion exchange method, and applied in the aerobic oxidative desulfurization. The experimental results indicated that both imidazole cation and polyoxometalate anion played a vital role in the desulfurization process. The prepared materials have a good performance on the degradation of aromatic sulfur compounds, which can reach up to 98.9 % under optimal conditions. Moreover, the structure-function relationship was also investigated in detail, as well as the proposed mechanism.
127 citations
TL;DR: P Powder X-ray diffraction, high-resolution transmission electron microscopy (HR-TEM) and fast Fourier transform (FFT) patterns revealed that 1 NSs could maintain their crystalline structure after exfoliation and exhibited excellent aqueous dispersibility, biodegradability and high cytotoxicity under light irradiation against MCF-7 cells.
Abstract: Two-dimensional (2D) metal-organic framework (MOF) nanosheets have emerged as a new member of 2D nanomaterials for molecular sieving, energy conversion and storage, catalysis and biomedicine. In this paper, a highly dense assembly of porphyrin achievable in porphyrin-integrated MOF nanosheets induced by an ionic liquid is obtained by sonication exfoliation of its bulk crystals. The 2D layered structure MOF, [BMI]2[Ca3(H2TCPP)2(μ2-OH2)2(H2O)2] (1), was firstly prepared by using the ionic liquid assisted synthetic method (H6TCPP = meso-tetra(carboxyphenyl) porphyrin, BMI = 1-butyl-3-methylimidazolium). The laminated layers in 1 clearly indicate a weak interlayer non-covalent interaction but a strong metal-carboxylate bonding within the layers, which facilitates the exfoliation of 1 to form 2D MOF nanosheets (1 NSs). Powder X-ray diffraction (PXRD), high-resolution transmission electron microscopy (HR-TEM) and fast Fourier transform (FFT) patterns revealed that 1 NSs could maintain their crystalline structure after exfoliation. These MOF nanosheets exhibited excellent aqueous dispersibility, biodegradability and high cytotoxicity under light irradiation against MCF-7 cells.
125 citations
TL;DR: Deep Eutectic solvents as discussed by the authors are compounds formed by a donor and an acceptor of hydrogen bond and are in liquid state at ambient temperature, and are non-volatile, with high thermal stability and readily dissolve many organic and inorganic compounds.
Abstract: Deep eutectic solvents are compounds formed by a donor and an acceptor of hydrogen bond; and are in liquid state at ambient temperature. They are non-volatile, with high thermal stability and readily dissolve many organic and inorganic compounds. They are recognized as green and cheap alternatives to ionic liquids. They have recently appeared in analytical practice but have already found wide application in various fields of analytical chemistry; mainly as effective extractants. However, their use as extractants does not limit the scope of their capabilities. This review is primarily devoted to the description of new possibilities of applications of deep eutectic solvents in analytical chemistry; including such areas as chromatographic separation, electrochemical analysis, sample preparation, synthesis and modification of new sorption materials. In addition, the stability of deep eutectic solvents, terminology, classification, further trends and some errors and inaccuracies associated with their applications are discussed.
TL;DR: The application of ionic liquids and supercritical CO2 in the modification and processing of starch is summarized and the development of regioselective derivatization and controlled grafting of starch are reviewed.
TL;DR: The potentials of non-crystalline states and functionalities as a new research direction for CPs are proposed, which would be related to ionic liquids and other ionic soft matters.
Abstract: There are two categories of coordination polymers (CPs): inorganic CPs (i-CPs) and organic ligand bridged CPs (o-CPs). Based on the successful crystal engineering of CPs, we here propose noncrystalline states and functionalities as a new research direction for CPs. Control over the liquid or glassy states in materials is essential to obtain specific properties and functions. Several studies suggest the feasibility of obtaining liquid/glassy states in o-CPs by design principles. The combination of metal ions and organic bridging ligands, together with the liquid/glass phase transformation, offer the possibility to transform o-CPs into ionic liquids and other ionic soft materials. Synchrotron measurements and computational approaches contribute to elucidating the structures and dynamics of the liquid/glassy states of o-CPs. This offers the opportunity to tune the porosity, conductivity, transparency, and other material properties. The unique energy landscape of liquid/glass o-CPs offers opportunities for properties and functions that are complementary to those of the crystalline state.
TL;DR: In this article, the properties of three types of ionic liquid based microemulsions, namely non-aqueous, aqueous, and ionic-liquid/oil/water microemulsion, are discussed.
TL;DR: In this article, coal samples were treated by ionic liquid with different concentrations and fractal dimensions were calculated to study the variation of pore characteristics and the fractal dimension of mesopores.
TL;DR: Efficient, often quantitative removal of several typical surface water pollutants is reported together with facile removal of the particles using a permanent magnet.
Abstract: Filtration is an established water-purification technology. However, due to low flow rates, the filtration of large volumes of water is often not practical. Herein, we report an alternative purification approach in which a magnetic nanoparticle composite is used to remove organic, inorganic, microbial, and microplastics pollutants from water. The composite is based on a polyoxometalate ionic liquid (POM-IL) adsorbed onto magnetic microporous core-shell Fe2 O3 /SiO2 particles, giving a magnetic POM-supported ionic liquid phase (magPOM-SILP). Efficient, often quantitative removal of several typical surface water pollutants is reported together with facile removal of the particles using a permanent magnet. Tuning of the composite components could lead to new materials for centralized and decentralized water purification systems.
TL;DR: In this article, a quasi-solid-state supercapacitor with high energy density and low self-discharge is synthesized by the addition of 1-butyl-3-methylimidazolium bromide (BMIMBr) ionic liquid (IL) and carbon nanotubes (CNTs) into a PVA aqueous solution.
TL;DR: The significantly improved PCE and stability in high humidity or temperature suggest that the perovskite passivation by ILs is an effective strategy for fabricating high PCe and stability PSCs.
Abstract: The defect passivation of perovskite films is an efficacious way to further boost the power conversion efficiency (PCE) and long-term stability of perovskite solar cells (PSCs). In this work, ionic...
TL;DR: In this paper, the pore-ion size matching between carbon electrodes and electrolytes is crucial for superior energy storage, and a simple synthetic route to obtain carbon hydrangeas integrated with unique geometry, high surface areas, N/O doping, and more importantly, well-developed pore structure is designed.
TL;DR: In this article, an imidazolium-derived polymeric ionic liquid called poly [3-butyl-1-vinylimidazolate bromide] (PIL) was synthesized and the corrosion inhibition properties of that material were investigated for a mild steel specimen immersed into 1.0 M HCl solution by the Tafel plot, electrochemical impedance spectroscopy (EIS), scanning electron microscopy (SEM) measurements, and quantum chemical calculation.
TL;DR: In this paper, N, S co-doped bamboo fiber derived carbon has been prepared when K3Fe(CN)6 and thiourea are selected as graphitization catalysis and dopant, respectively.
TL;DR: Ionic liquids are organic salts, melting below 100 °C, and are generally non-volatile and non-flammable as discussed by the authors, and they can be synthesized by combination of different anions and cations.
Abstract: Since the introduction of ionic liquids (IL) in 1914, there has been a growing interest in this class of materials, because of their unique properties. Ionic liquids are organic salts, melting below 100 °C, and are generally non-volatile and nonflammable. By combination of different anions and cations, a large number of ionic liquids can be synthesized. The extraordinary characteristics of ILs and the possibility of synthesizing large number of ILs make them as an appropriate medium for various chemical processes and applications. In this review, first, we give a brief overview on IL important physical properties, and then we look into different IL applications, considering recent studies and findings and the future prospects of using IL in each application. This review gives a reader a complete knowledge about various ILs application all together. In addition, it reveals the areas of application which will grow in future and can gain industrial importance. ILs applications in separation processes, lignocelluloses pretreatment, enhanced oil recovery (EOR), biocatalytic reactions, lubrication and electrochemistry are discussed.
TL;DR: In this article, a review of green solvents employed for carbon capture, with emphasis on ionic liquids, deep eutectic and liquid polymers, is presented.
Abstract: Global warming is a critical issue resulting partly from increasing carbon dioxide emissions. Technologies have been developed to capture carbon dioxide followed by storage or utilization, yet techniques are limited by the use of toxic solvents and the generation of harmful by-products. Research in green chemistry has designed green solvents which are non-toxic, efficient and environmentally friendly. Here we review green solvents employed for carbon capture, with emphasis on ionic liquids, deep eutectic solvents and liquid polymers. Solvent performance depends on temperature, density and viscosity. Deep eutectic solvents appear as the most advanced solvents with capacities reaching up to 4.292 g CO2 per g of solvent. Ionic liquids have shown CO2 uptakes of 4.72 mol of CO2/mol of solvent, but are less efficient on average. Liquid polymers display capacities of up to 1.357 mol of CO2/mol of solvent.
TL;DR: In this paper, a multifunctional imidazolium based hypercrosslinked ionic polymers with versatile functional groups (sulfonic, hydroxyl, amino, carboxyl, and alkyl group), abundant microporosity and high ionic site density were constructed in a two-step solvothermal route.
01 Sep 2020
TL;DR: In this paper, the authors discuss the critical issues on aluminum electrochemistry in aqueous system, cathode material design to overcome the drawbacks by multivalent aluminum ions, and challenges on electrolyte design, aluminum stripping/plating, solid-electrolyte interface (SEI) formation, and design of cathode materials.
Abstract: Aluminum ion battery (AIB) technology is an exciting alternative for post-lithium energy storage. AIBs based on ionic liquids have enabled advances in both cathode material development and fundamental understanding on mechanisms. Recently, unlocking chemistry in rechargeable aqueous aluminum ion battery (AAIB) provides impressive prospects in terms of kinetics, cost, safety considerations, and ease of operation. To review the progress on AAIB, we discuss the critical issues on aluminum electrochemistry in aqueous system, cathode material design to overcome the drawbacks by multivalent aluminum ions, and challenges on electrolyte design, aluminum stripping/plating, solid-electrolyte interface (SEI) formation, and design of cathode materials. This review aims to stimulate exploration of high-performance AAIB and rationalize feasibility grounded on underlying reaction mechanisms.
TL;DR: In this paper, a review summarizes recent research advances in developing ionic liquid containing, polymer/inorganic hybrid electrolytes, including their preparation routes, ion conduction, electrochemical properties, and mechanical and thermal properties.
TL;DR: In this article, the development of efficient methods for CO2 absorption and separation is discussed, however, the development is limited due to the high computational complexity and time complexity of the process.
Abstract: Carbon dioxide (CO2) is a detrimental greenhouse gas to the environment as the main contributor to global warming. However, the development of efficient methods for CO2 absorption and separation is...
TL;DR: In this article, an efficient biocatalyst immobilized on magnetic nanoparticles modified by amino-functionalized ionic liquid using dialdehyde starch as crosslinker (Fe3O4-NIL-DAS) was fabricated.
TL;DR: A judicious analysis of these emerging ionic soft materials, their properties and applications open in energy, (bio)electronics, drug delivery, analytical chemistry, and wastewater treatment is provided.
Abstract: In the last 5 years, the use of deep eutectic solvents (DESs) have been opening new perspectives toward the creation of novel ionic soft materials as alternatives to expensive ionic liquids. This M...
TL;DR: A comprehensive review of chemical catalytic systems containing any component derived from a natural product can be found in this paper, including cellulose, saccharides, lignin and lignocellulosic materials, choline derived species, guanidine and guanidinium salts, and other less explored compounds.