Volume-invariant ionic liquid microbands as highly durable wearable biomedical sensors

2016 ◽  
Vol 3 (3) ◽  
pp. 208-213 ◽  
Author(s):  
Yan Wang ◽  
Shu Gong ◽  
Stephen Jia Wang ◽  
George P. Simon ◽  
Wenlong Cheng
Keyword(s):  
Ionic Liquid ◽  
Ionic Liquids ◽  
High Performance ◽  
Wearable Sensors ◽  
Flow Properties ◽  
Biomedical Sensors

Non-volatile and flow properties of ionic liquids allow for simple ‘fill and seal’ approach to fabricate high-performance wearable sensors without materials delamination or cracking.

Preconcentration and Determination of Aromatic Amines with Temperature-Controlled Ionic Liquid Dispersive Liquid Phase Microextraction in Combination with High Performance Liquid Chromatography

2012 ◽  
Vol 95 (5) ◽  
pp. 1534-1540 ◽  
Author(s):  
Qingxiang Zhou ◽  
Yuantuan Gao ◽  
Junping Xiao ◽  
Guohong Xie
Keyword(s):  
Ionic Liquid ◽  
Ionic Liquids ◽  
Liquid Phase ◽  
Aromatic Amines ◽  
High Performance ◽  
Correlation Coefficients ◽  
Detection Sensitivity ◽  
Liquid Phase Microextraction ◽  
Temperature Controlled

Abstract This paper reports a new method for the determination of aromatic amines with temperature-controlled ionic liquid dispersive liquid-phase microextraction in combination with HPLC and results of investigation of the influence of anions in ionic liquids on the extraction performance. In these experiments, 1-octyl-3-methylimidazolium hexafluorophosphate ([C8MIM][PF6]), 1-octyl-3-methylimidazolium bis (trifluoromethanesulfonyl) imide ([C8MIM][NTf2]), and 1-octyl-3-methylimidazolium tetrafluoroborate ([C8MIM][BF4]) were used as the extraction solvents for the investigation of the effect of anions in ionic liquids. Other parameters affecting the microextraction performance were also investigated. Under the optimal conditions, the proposed method had good linearity over the concentration ranges of 1.0–100 μg/L for 2, 4-dimethylaniline, 2-chloroanline, and N,N-dimethylaniline, and 1.5–150 μg/L for N,N-dimethylaniline and alpha-naphthylamine, with excellent correlation coefficients (R2 ≥ 0.999), excellent detection sensitivity with LODs (S/N = 3) in the range of 0.39–0.63 μg/L, and precision in the range of 3.2–5.4% RSD (n = 6). Real water samples were analyzed with the established method, and good spike recoveries in the range of 86.3 to 98.9% were obtained. These results indicated that this method would be useful in the routine analysis of such pollutants.

scholarly journals Synthesis of cellulose graft ionic liquid using silanization reaction

2019 ◽  
Vol 22 (2) ◽  
pp. 228-234 ◽  
Author(s):  
Ut Dong THACH ◽  
Thi Lan Nhi Do ◽  
Ngoc Lan Anh Do ◽  
Minh Huy Do
Keyword(s):  
Ionic Liquid ◽  
Ionic Liquids ◽  
High Performance ◽  
High Efficiency ◽  
High Capacity ◽  
High Viscosity ◽  
Batch Adsorption ◽  
Hydroxyl Groups ◽  
Base Catalyst ◽  
Low Efficiency

Introduction: Ionic liquids (ILs) have attached many attentions due to their interesting physicochemical properties. However, ionic liquids have several disadvantages including high viscosity, difficult to purify, separate and recycle, and expensive. Therefore, supported ionic liquids (SIL) have been developed to overcome these problems. SIL based on cellulose material was conventionally synthesized by silanization reaction between ionic liquid trialkoxyl silane and hydroxyl groups on the surface of cellulose. However, low reactivity of cellulose hydroxyl groups causes the low efficiency of silanization reaction. With the aim to resolve these problems and improve the reactivity of cellulose silanization reaction, cellulose graft ionic liquid was synthesized and characterized. Methods: Cellulose graft ionic liquid (CL-IL) material was synthesized by silanization reaction. The influence of reaction condition such as IL/CL (w/w) ratio, base catalyst (NH3) and agent coupling tetraethyl orthosilicate (TEOS) on silanization reaction was investigated. The modified CL-IL materials were characterized using FT-IR, TGA, SEM. The ion exchange properties were evaluated via batch adsorption studies to evidence the efficiency of silanization reaction of cellulose. Results: The study indicated that adding TEOS with NH3 catalyst could significantly increase the number of imidazolium groups grafted on cellulose about 75% compared to the conventional approach. CL-IL material is an efficient anion exchange materials displaying fast kinetic adsorption and high capacity adsorption of MO up to 1.4 mmol g-1. Conclusion: High-efficiency of cellulose silanization was obtained by using coupling agent TEOS and base catalyst. Therefore, the silanization reaction can be used for synthesis divers of functional cellulose materials. This approach can be aimed for the design of cheaper and high-performance materials for catalysis, polymer composite and adsorption in water treatment and depollution of industrial wastewater.  

Passivation of defects in inverted perovskite solar cells using an imidazolium-based ionic liquid

2020 ◽  
Vol 4 (8) ◽  
pp. 3971-3978 ◽  
Author(s):  
Chuanyao Luo ◽  
Guannan Li ◽  
Lijia Chen ◽  
Jun Dong ◽  
Miao Yu ◽  
...  
Keyword(s):  
Ionic Liquid ◽  
Ionic Liquids ◽  
Solar Cells ◽  
High Performance ◽  
Perovskite Solar Cells ◽  
Cationic Group

This work provides an easy approach to achieve high-performance perovskite solar cells via passivation of the uncoordinated Pb2+ in perovskite films by the cationic group of ionic liquids.

Ionic Liquids As Additives to Cutting Fluids to Reduce Machine Tool Friction and Wear

2018 ◽  
Author(s):  
Chris Ferri ◽  
Sydney Lizarazo ◽  
Michael Troise ◽  
Patricia Iglesias
Keyword(s):  
Ionic Liquid ◽  
Ionic Liquids ◽  
High Performance ◽  
Large Scale ◽  
Minimum Quantity Lubrication ◽  
Molecular Structures ◽  
Effect Of Temperature ◽  
Wear Volume ◽  
Manufacturing Processes ◽  
Subtractive Manufacturing

In manufacturing processes, the cost of tooling contributes to a significant portion of operating costs. Several papers have been dedicated to various improvements on tool life, including monitoring the effect of temperature conditions and flood cooling. Flood cooling is not economical, so research has also been done to investigate minimum quantity lubrication and the effects of different additives, such as nanofluids. Another additive, ionic liquids, have become popular in tribological studies because they have unique properties that allow them to form ordered molecular structures, which is ideal in lubrication. Research has proven ionic liquids to be effective in reducing wear and friction coefficients. Currently, utilizing ionic liquids specifically to reduce tool wear has been almost exclusively limited to titanium and steel applications. The goal of this study is to improve tribological performance of the subtractive manufacturing process using ionic liquid add-ins to widely available machine shop coolants and oils. A series of reciprocating ball-on-flat experiments will be conducted using a 1.5mm diameter 250 Chrome Steel G25 ball and 6061-T6 aluminum disk to simulate cutting conditions often seen in manufacturing processes. 6061 Aluminum is an alloy commonly seen in machine shops and large-scale manufacturing scenarios because of its versatile material properties and wide availability. The tests were run at constant sliding distance, velocity and load. The lubricating mixtures were prepared by adding 5 wt % of a phosphonium based ionic liquid, Trihexyltetradecylphosphonium bis(trifluoromethylsulfonyl)amide ([THTDP][NTf2]), to the base fluids Trim Sol™ emulsion fluid and Mobilmet™ 766 high performance neat cutting oil. The addition of the ionic liquid to both base lubricants (oil and coolant) increased the friction coefficient (18.60% and 4.89%, respectively) while the wear volume was reduced (28.75% and 7.84%, respectively). The results for the oil provided evidence that the ionic liquid did have an effect to reduce wear, however, the same conclusion could not be drawn for the coolant.

scholarly journals SYNTHESIS OF 5-HYDROXYMETHYLFURFURAL USING IONIC LIQUID [BMIM][BR] FROM RESIDUAL SOYBEAN AND RICE BIOMASSES

2018 ◽  
Vol 5 (Especial) ◽  
pp. 125-132
Author(s):  
Elisandra Scapin ◽  
Guenther Carlos Couto Viana
Keyword(s):  
Ionic Liquid ◽  
High Performance Liquid Chromatography ◽  
Ionic Liquids ◽  
Liquid Chromatography ◽  
High Performance ◽  
Renewable Energy Sources ◽  
Reaction Times ◽  
Energy Sources ◽  
Infrared Spectrophotometry ◽  
Furanic Compounds

In contrast to the major environmental impacts of the petrochemical activity, renewable energy sources have been developing, and among this, biomass has stood out. Among the derivatives obtained from biomass, 5-hydroxymethylfurfural (HMF) is considered a key piece in this process. This work aims at the use of rice and soybean hulls for the synthesis of HMF using the ionic liquid [BMIM][Br], aiming the sustainability of this process. Initially the physical pretreatment of biomass followed by acid hydrolysis was carried out. For the synthesis of HMF, 5ml of the hydrolyzate, 2g of ionic liquid at 120ºC, were used in different reaction times. The results were analyzed by infrared spectrophotometry and by high performance liquid chromatography. The best results in both biomasses were after 2h of reaction reaching a concentration of up to 25 times greater when compared to the hydrolyzate, showing the high potential of ionic liquid [BMIM] [Br] in the synthesis of furanic compounds. Keywords: Furanic compounds, raw biomass, ionic liquids.

scholarly journals Halloysite Nanoclay with High Content of Sulfonic Acid-Based Ionic Liquid: A Novel Catalyst for the Synthesis of Tetrahydrobenzo[b]pyrans

Catalysts ◽  
2021 ◽  
Vol 11 (10) ◽  
pp. 1172
Author(s):  
Samahe Sadjadi ◽  
Fatemeh Koohestani ◽  
Neda Abedian-Dehaghani ◽  
Majid M. Heravi
Keyword(s):  
Ionic Liquid ◽  
Ionic Liquids ◽  
Sulfonic Acid ◽  
High Performance ◽  
Acid Catalyst ◽  
One Pot ◽  
Heterocyclic Ligand ◽  
Novel Catalyst ◽  
Supported Ionic Liquids ◽  
Low Activity

One of the main drawbacks of supported ionic liquids is their low loading and consequently, low activity of the resultant catalysts. To furnish a solution to this issue, a novel heterocyclic ligand with multi imine sites was introduced on the surface of amino-functionalized halloysite support via successive reactions with 2,4,6-trichloro-1,3,5-triazine and 2-aminopyrimidine. Subsequently, the imine sites were transformed to sulfonic acid-based ionic liquids via reaction with 1,4-butanesultone. Using this strategy, high loading of ionic liquid was loaded on halloysite nanoclay. The supported ionic liquid was then characterized with XRD, SEM, TEM, EDS, FTIR, BET, TGA and elemental mapping analysis and utilized as a metal-free Brønsted acid catalyst for promoting one-pot reaction of aldehydes, dimedone and malononitrile to furnish tetrahydrobenzo[b]pyrans. The catalytic tests confirmed high performance of the catalyst. Moreover, the catalyst was stable upon recycling.

Dual Li-ion migration channels in ester-rich copolymer/ionic liquid quasi-solid-state electrolyte for high-performance Li-S batteries

2021 ◽  
Author(s):  
Xiaomin Cai ◽  
Bei Ye ◽  
Jianlong Ding ◽  
Ziyun Chi ◽  
Liping Sun ◽  
...  
Keyword(s):  
Ionic Liquid ◽  
Ionic Liquids ◽  
Solid State ◽  
Polymer Electrolytes ◽  
High Performance ◽  
Ion Migration ◽  
Solid State Electrolyte ◽  
Lithium Sulfur Batteries ◽  
Li Ion ◽  
Lithium Sulfur

Solid-state polymer electrolytes are expected to fundamentally solve the instability and safety problems of liquid electrolytes for lithium sulfur batteries. Herein, ionic liquids were introduced on the basis of constructing...

Mapping the “Extra Solvent Power, ESP” of Ionic Liquids for Monomers, Polymers and Globular Nanoparticles

2017 ◽  
Author(s):  
Jose A. Pomposo
Keyword(s):  
Ionic Liquid ◽  
Ionic Liquids ◽  
Linear Polymers ◽  
Green Solvents ◽  
Ionic Polymers ◽  
First Time ◽  
Solvent Power

Understanding the miscibility behavior of ionic liquid (IL) / monomer, IL / polymer and IL / nanoparticle mixtures is critical for the use of ILs as green solvents in polymerization processes, and to rationalize recent observations concerning the superior solubility of some proteins in ILs when compared to standard solvents. In this work, the most relevant results obtained in terms of a three-component Flory-Huggins theory concerning the “Extra Solvent Power, ESP” of ILs when compared to traditional non-ionic solvents for monomeric solutes (case I), linear polymers (case II) and globular nanoparticles (case III) are presented. Moreover, useful ESP maps are drawn for the first time for IL mixtures corresponding to case I, II and III. Finally, a potential pathway to improve the miscibility of non-ionic polymers in ILs is also proposed.

Dynamics of Ion Locking in Doubly Polymerized Ionic Liquids

2020 ◽  
Author(s):  
Swati Arora ◽  
Julisa Rozon ◽  
Jennifer Laaser
Keyword(s):  
Dielectric Constant ◽  
Ionic Liquid ◽  
Ionic Liquids ◽  
Ion Pairs ◽  
Polymer Chains ◽  
Ion Motion ◽  
Charged Species ◽  
Broadband Dielectric Spectroscopy ◽  
Covalently Linked ◽  
Insight Into

<div>In this work, we investigate the dynamics of ion motion in “doubly-polymerized” ionic liquids (DPILs) in which both charged species of an ionic liquid are covalently linked to the same polymer chains. Broadband dielectric spectroscopy is used to characterize these materials over a broad frequency and temperature range, and their behavior is compared to that of conventional “singly-polymerized” ionic liquids (SPILs) in which only one of the charged species is attached to the polymer chains. Polymerization of the DPIL decreases the bulk ionic conductivity by four orders of magnitude relative to both SPILs. The timescales for local ionic rearrangement are similarly found to be approximately four orders of magnitude slower in the DPILs than in the SPILs, and the DPILs also have a lower static dielectric constant. These results suggest that copolymerization of the ionic monomers affects ion motion on both the bulk and the local scales, with ion pairs serving to form strong physical crosslinks between the polymer chains. This study provides quantitative insight into the energetics and timescales of ion motion that drive the phenomenon of “ion locking” currently under investigation for new classes of organic electronics.</div>

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