Ionic Liquids as Liquid Materials for Analytical Chemistry

Nishi, Naoya

doi:10.2116/analsci.highlights2001

Cited by 5 publications

(3 citation statements)

References 21 publications

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“…Ionic liquids (ILs) are normally defined as compounds composed entirely of ions with melting point below 100 C. [21,22] An IL consists of an organic cation and an organic or inorganic anion, and is well known for its low vapor pressure, non-flammability, good thermal and chemical stability [23][24][25][26] and flexible structure design. [27] So far, ILs have been widely applied in the fields of analytical chemistry, [28,29] electrochemistry, [30][31][32] polymerization [33,34] and gas absorption/separation. [35][36][37][38] In the last decade, the potential applications as an effective and eco-friendly surface modification agent for fillers in rubber materials have also aroused great interest.…”

Section: Introductionmentioning

confidence: 99%

Preparation and properties of the aramid pulp/nitrile butadiene rubber composites with compatibilization of ionic liquids

et al. 2023

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To improve the uniformity and the mechanical/wear performances of the aramid pulp (AP)/nitrile butadiene rubber (NBR) composites, two types of ionic liquids (ILs), that is, 1-carboxymethyl-3-methylimidazolium chloride ([CmMIM]Cl) and 1-allyl-3-vinylimidazolium chloride ([AVIM]Cl) were applied on the AP surface, respectively. The ILs partially disrupted the hydrogen-bonds between the aramid chains to mitigate the fiber entanglement, and connected the AP to the rubber matrix by hydrogen-bond interaction or the crosslinking reaction during the vulcanization. The test results showed that, the IL treatments effectively improved the tensile and tear strengths without obviously affecting the physical characteristics of the composites. The wear properties of the AP/NBR composites also improved due to the enhancements of the tear strength and the connection between the AP and NBR matrix. Compared to the [CmMIM]Cl, the [AVIM]Cl was more efficient to improve the properties attributed to its better compatibilization for the AP/NBR system. For example, the specific wear rate under 20-N load of the composite with 15-phr [AVIM]Cl-AP was 1.1 Â 10 À7 mm 3 N À1 mm À1 , which was approximately 25% and 35% lower than that of the composites reinforced with 15-phr [CmMIM]Cl-AP and untreated AP, respectively.

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Section: Introductionmentioning

confidence: 99%

Preparation and properties of the aramid pulp/nitrile butadiene rubber composites with compatibilization of ionic liquids

et al. 2023

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“…Ionic liquids (ILs) are among the potential candidates for novel liquid media, and have attracted much attention in many fields, including analytical chemistry [13][14][15][16] and materials science. [17][18][19][20] In general, ILs are defined as "salts with melting temperatures below 100°C" 21 or "liquids composed entirely of ions that are fluid around or below 100°C".…”

Section: Introductionmentioning

confidence: 99%

Recent Progress in Ionic Liquid Extraction for the Separation of Rare Earth Elements

Okamura

Hirayama

2020

ANAL. SCI.

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This review summarizes recent progress in solvent extraction of rare earth elements (REEs) using an ionic liquid (IL) as the extraction solvent. These IL extraction systems are advantageous owing to the affinity of ILs for both charged and neutral hydrophobic species, in contrast to conventional organic solvent extraction systems. Herein, REE extraction studies using ILs are detailed and classified based on the type of extraction system, namely extraction using anionic ligands, extraction using neutral ligands, synergistic extraction, extraction without extractants, and a specific system using task-specific ionic liquids (TSILs). In IL extraction systems, the extracted complexes are often different from those in organic solvent systems, and the REE extraction and separation efficiencies are often significantly enhanced. Synergistic IL extraction is an effective approach to improving the extractability and separability of REEs. The development of novel TSILs suitable for IL extraction systems is also effective for REE separation.

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“…Deep eutectic solvents (DESs) are emerging as new molten salts used in many fields such as analytical chemistry, electrochemical, organic reaction, drugs and separation (Bakavoli et al, 2015;Zhao et al , 2015;Nishi, 2020). Classic molten salts such as ionic liquids (ILs) have been the choice for alternative volatile organic solvents for quite some time as they can be designed prior to applications (Plechkova and Seddon, 2007).…”

Section: Introductionmentioning

confidence: 99%

Selective separation of tocol isomers by liquid−liquid extraction using choline−based deep eutectic solvents

Hadi¹,

Ng²

2020

Preprint

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In this paper we examined the potential for choline-based deep eutectic solvents (DESs) for selective extraction of tocol isomers from crude palm oil (CPO) through liquid-liquid extraction. The effect of increasing DES amount on the distribution and selectivity of tocol isomers (α-tocopherol, α-β, γ-, and δ-tocotrienol) were investigated. It was found that tocol isomers are distributed in the order of the hydrophilic power of the tocols, with more tocols of higher polarity distributed more into the stripping phase compared to the less polar tocols. Distribution coefficients for α-tocopherol, α-β, γ-, and δ-tocotrienol were 7.8, 13.1, 19.8, 22.1 and 29.6, respectively, when equal weight of CPO and choline chloride-malonic acid eutectic mixture (DES1) was used. With increasing DES1, the distribution of each tocol isomers also increased, due to the increasing polarity of the stripping phase that attracted more tocols. Selectivity of δ-tocotrienol which is the most polar, were always higher than other isomers (α-tocopherol: 3.81, α-tocotrienol: 2.22, β-tocotrienol: 1.50, γ-tocotrienol: 1.34). This confirmed the role of hydrophilic power of the tocols in selective separation of tocol isomers using DES in this study

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Ionic Liquids as Liquid Materials for Analytical Chemistry

Cited by 5 publications

References 21 publications

Preparation and properties of the aramid pulp/nitrile butadiene rubber composites with compatibilization of ionic liquids

Preparation and properties of the aramid pulp/nitrile butadiene rubber composites with compatibilization of ionic liquids

Recent Progress in Ionic Liquid Extraction for the Separation of Rare Earth Elements

Selective separation of tocol isomers by liquid−liquid extraction using choline−based deep eutectic solvents

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