Determination of Solubility Parameters of Ionic Liquids and Ionic Liquid/Solvent Mixtures from Intrinsic Viscosity

ChemPhysChem ◽  
2014 ◽  
Vol 15 (16) ◽  
pp. 3580-3591 ◽  
Author(s):  
Piyarat Weerachanchai ◽  
Yuewen Wong ◽  
Kok Hwa Lim ◽  
Timothy Thatt Yang Tan ◽  
Jong-Min Lee
Keyword(s):  
Ionic Liquid ◽  
Ionic Liquids ◽  
Intrinsic Viscosity ◽  
Solubility Parameters ◽  
Solvent Mixtures

Dispersive Liquid-Liquid Microextraction Based on Ionic Liquid and Spectrophotometric Determination of Bilirubin in Biological Samples

2020 ◽  
Vol 16 (5) ◽  
pp. 652-659
Author(s):  
Asiye A. Avan ◽  
Hayati Filik
Keyword(s):  
Ionic Liquid ◽  
Ionic Liquids ◽  
Biological Samples ◽  
Urine Samples ◽  
Spectrophotometric Detection ◽  
Full Color ◽  
Dispersive Liquid Liquid Microextraction ◽  
Urine And Serum ◽  
Liquid Microextraction

Background: An Ionic Liquid-based based Dispersive Liquid-Liquid Microextraction (IL-DLLME) method was not applied to preconcentration and determination of bilirubin. Ionic Liquids (ILs) are new chemical compounds. In recent years, Ionic Liquids (ILs) have been employed as alternative solvents to toxic organic solvents. Due to these perfect properties, ILs have already been applied in many analytical extraction processes, presenting high extraction yield and selectivity for analytes. Methods: In this study, IL-DLLME was applied to biological samples (urine and serum) for the spectrophotometric detection of bilirubin. For bilirubin analysis, the full-color development was based on the reaction with periodate in the presence of hydrochloric acid. The high affinity of bilirubin for the ionic liquid phase gave extraction percentages above 98% in 0.3 M HCl solution. Results: Several IL-extraction parameters were optimized and room temperature ionic liquid 1-butyl- 1-methylpyrrolidinium bis(trifluoromethylsulfonyl)imide and ethanol were used as extraction and disperser solution. The linear range was found in the range of 0.5-6.0 μM (0.3-3.5 μg mL-1) and the limits of detection of the proposed method was 0.5 μM (0.3 μg mL-1). The proposed method was applied for the preconcentration and separation of trace bilirubin in real urine samples. Also, the recoveries for bilirubin in spiked biological samples (urine and serum) were found to be acceptable, between 95-102%. Conclusion: The proposed IL-DLLMEapproach was employed for the enrichment and determination of trace levels of bilirubin in urine samples using NaIO4 as an oxidizing agent and Uv-vis spectrophotometric detection. The periodate oxidation of bilirubin is rapid, effective, selective, and simple to perform. The method contains only HCl, NaOI4, and an anionic surfactant. The method may be useful for economizing in the consumption of reagents in bilirubin determining. The IL-DLLMEmethod ensures a high yield and has a low toxicity no skin sensitization, no mutagenicity and no ecotoxicity in an aquatic environment since only very low quantities of an IL is required. For full-color formation, no any extra auxiliary reagents are required. Besides, the IL-DLLME technique uses a low-cost instrument such as Uv-vis which is present in most of the medical laboratories.

scholarly journals Properties and applications of cellulose regenerated from cellulose/imidazolium-based ionic liquid/co-solvent solutions: A short review

e-Polymers ◽  
2021 ◽  
Vol 21 (1) ◽  
pp. 869-880
Author(s):  
Ahmad Adlie Shamsuri ◽  
Khalina Abdan ◽  
Siti Nurul Ain Md. Jamil
Keyword(s):  
Ionic Liquid ◽  
Ionic Liquids ◽  
Cellulose Acetate ◽  
Processing Time ◽  
Short Review ◽  
Organic Liquids ◽  
Regenerated Cellulose ◽  
Solvent Mixtures ◽  
Different Types ◽  
Novel Applications

Abstract An improvement of ecological conscience currently has increased the consciousness of researchers in reducing the processing time and cost of solvent for the dissolution of cellulose. Latterly, ionic liquids have been employed to process cellulose as they are recyclable and nonvolatile. Besides that, biopolymers such as chitosan, chitin, starch, protein, and cellulose acetate can also be processed by using ionic liquids for diverse applications. In this short review, examples of imidazolium-based ionic liquids that are commonly used for the dissolution of cellulose are implied. Furthermore, examples of organic liquids that are utilized as co-solvents for ionic liquids were revealed. In addition, examples of imidazolium-based ionic liquid/co-solvent mixtures utilized in the dissolution of cellulose and other biopolymers are also demonstrated. The properties and applications of cellulose and its blends regenerated from different types of cellulose/imidazolium-based ionic liquid/co-solvent solutions are also shortly reviewed. The information acquired from this review gives a better understanding of the changes in the properties of regenerated cellulose and regenerated cellulose blends. In addition, this short review serves as a model basis for the creation of novel applications of regenerated cellulose and regenerated cellulose blends by utilizing imidazolium-based ionic liquid/co-solvent mixtures.

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 Fabrication of polyacrylonitrile hollow fiber membranes from ionic liquid solutions

2016 ◽  
Vol 7 (1) ◽  
pp. 113-124 ◽  
Author(s):  
DooLi Kim ◽  
Nicolas Moreno ◽  
Suzana Pereira Nunes
Keyword(s):  
Ionic Liquid ◽  
Ionic Liquids ◽  
Hollow Fiber ◽  
Solvent Mixtures ◽  
Pore Morphology ◽  
Hollow Fiber Membranes ◽  
Lower Toxicity ◽  
Liquid Solutions ◽  
Polar Organic Solvents ◽  
Fiber Membranes

PAN hollow fiber membranes with good pore morphology have been fabricated using solvent mixtures of ionic liquids and DMSO, which has a lower toxicity than other commonly used polar organic solvents.

Determination of N-Heptyl Pyridine Tetrafluoroborate in Ethanol

2014 ◽  
Vol 685 ◽  
pp. 110-113
Author(s):  
Lu Yu ◽  
Peng Tian ◽  
Shi Gang Xin ◽  
Hong Lin Ding
Keyword(s):  
Ionic Liquid ◽  
Ionic Liquids ◽  
Room Temperature ◽  
Standard Addition ◽  
Decomposition Reaction ◽  
Addition Method ◽  
Uv Spectrum ◽  
Double Decomposition ◽  
Maximum Absorption Wavelength

N-heptyl-pyridine tetrafluoroborate is prepared by the double decomposition reaction of HEPB and NaBF4. The ionic liquid at room temperature used in the experiment has a significant absorption determined by UV spectrum within the range of 200-400nm, the maximum absorption wavelength of HEP-BF4ionic liquid in ethanol is 244nm. The standard working curve of HEP-BF4ionic liquid is y=0.00441+0.01563x (R=0.99912). The linear range of HEP-BF4ionic liquids in the ethanol is 1-75 mg/L. The recovery rate of HEP-BF4ionic liquid which is between 96.6% and 102%, is measured by standard addition method in ethanol.

Electrolyte-gated polymer thin film transistors making use of ionic liquids and ionic liquid-solvent mixtures

2015 ◽  
Vol 117 (11) ◽  
pp. 112809 ◽  
Author(s):  
Jonathan Sayago ◽  
Xiang Meng ◽  
Francis Quenneville ◽  
Shuang Liang ◽  
Étienne Bourbeau ◽  
...  
Keyword(s):  
Thin Film ◽  
Ionic Liquid ◽  
Ionic Liquids ◽  
Thin Film Transistors ◽  
Solvent Mixtures ◽  
Polymer Thin Film

Determination of the Presence of Composite Ions in Catalysts and Composite Ionic Liquids-Catalyzed Isobutane Alkylation

2011 ◽  
Vol 287-290 ◽  
pp. 1666-1670 ◽  
Author(s):  
Ying Nan Cong ◽  
Ying Liu ◽  
Rui Sheng Hu
Keyword(s):  
Ionic Liquid ◽  
Ionic Liquids ◽  
Ir Spectroscopy ◽  
Catalytic Performance ◽  
Ir Absorption ◽  
Absorption Bands ◽  
Alkyl Groups ◽  
Ft Ir ◽  
Ft Ir Spectroscopy

A novel and efficient method was established to investigate isobutane/2-butene alkylation. In this method FT-IR spectroscopy was used to determine the presence of the composite ion (AlCuCl5-) in the composite ionic liquid (CIL). The trimethylpentane selectivity of the composite ionic liquid for isobutane/2-butene alkylation was also estimated by monitoring the shift of IR absorption bands in the range 1636–1685 cm-1. A detailed study of the alkylation of isobutane /2-butene in CIL media has been conducted using 1-alkyl-3-methylimidazolium halide/X aluminum chloride-y cuprous (I) chloride ([CnMIM]Cl/xAlCl3-yCuCl) encompassing various alkyl groups (n=4:B, butyl-, n=6:H, hexyl-, and n=8: O, octyl-)respectively. The ionic liquids showed higher selectivities of C8 as well as the TMP/DMH ratios in alkylates. The better catalytic performance of CIL can be attributed to the presence of the composite ion in it, and the catalytic performance of the chloroaluminate ionic liquid can be indicated by the 1685 cm-1band of FT-IR spectroscopy.

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