Pulse radiolysis studies of functionally substituted imidazolium-based ionic liquids

Fu, Haiying; Zhang, Xing; Cao, Xia; Wang, Guozhong

doi:10.1007/s11434-012-5129-8

Cited by 6 publications

(8 citation statements)

References 25 publications

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“…1 μm from the irradiated positions during that interval time . In addition, the lifetime of the reactive species is several tens of microseconds is too short to maintain its chemical reactivity over repetitive scans . Therefore, it is most plausible that the oligomers having a much lower diffusivity than monomers that are formed during the first and second scan, and then they are deposited to form the rigid structure by the third scan.…”

Section: Discussionmentioning

confidence: 99%

“…The reactive species indicated here are solvated electrons and radical ions. The mechanism for the formation of these species has widely been studied by many radiation chemists. − These reactive species trigger several chemical reactions, such as the reduction of metal ions , and cross-linking reactions. , The reactive species generated by quantum beam irradiation on RTIL and chemical interactions between RTIL and ionizing radiation have attracted many researchers. − According to previous studies, the radiolytic yield of solvated electrons in RTILs is higher than that in most organic solvents, and thus they could be very useful media for studies of radiolytic reactions such as electron transfer . Additionally, many technologies combining RTILs and radiation techniques have been developed in recent years. − …”

Section: Introductionmentioning

confidence: 99%

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Polymerization of Room-Temperature Ionic Liquid Monomers by Electron Beam Irradiation with the Aim of Fabricating Three-Dimensional Micropolymer/Nanopolymer Structures

Minamimoto¹,

Irie²,

Uematsu³

et al. 2014

Langmuir

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A novel method for fabricating microsized and nanosized polymer structures from a room-temperature ionic liquid (RTIL) on a Si substrate was developed by the patterned irradiation of an electron beam (EB). An extremely low vapor pressure of the RTIL, 1-allyl-3-ethylimidazolium bis((trifluoromethane)sulfonyl)amide, allows it to be introduced into the high-vacuum chamber of an electron beam apparatus to conduct a radiation-induced polymerization in the nanoregion. We prepared various three-dimensional (3D) micro/nanopolymer structures having high aspect ratios of up to 5 with a resolution of sub-100 nm. In addition, the effects of the irradiation dose and beam current on the physicochemical properties of the deposited polymers were investigated by recording the FT-IR spectra and Young's modulus. Interestingly, the overall shapes of the obtained structures were different from those prepared in our recent study using a focused ion beam (FIB) even if the samples were irradiated in a similar manner. This may be due to the different transmission between the two types of beams as discussed on the basis of the theoretical calculations of the quantum beam trajectories. Perceptions obtained in this study provide facile preparation procedures for the micro/nanostructures.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Polymerization of Room-Temperature Ionic Liquid Monomers by Electron Beam Irradiation with the Aim of Fabricating Three-Dimensional Micropolymer/Nanopolymer Structures

Minamimoto¹,

Irie²,

Uematsu³

et al. 2014

Langmuir

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“…Detailed descriptions of the setup of pulse radiolysis equipment and experimental conditions are described in ref. [11]. The absorbed dose was measured using an N 2 O-saturated 100 mmol/L KSCN aqueous solution (G ×  = 51000 J/cm at 472 nm) [12].…”

Section: Methodsmentioning

confidence: 99%

“…The peak at 510 nm contributed to the AQS •− anion radical. Therefore, the electron transfer between AQS and BPY occurred as reaction (11). The rate constant was measured to be 4.6 × 10 9 L/(mol s).…”

Section: Radiolysis Of Pyridinium Ionic Liquid Aqueous Solutionmentioning

confidence: 99%

Electron transfer in N-butylpyridinium tetrafluoroborate ionic liquid by pulse radiolysis

Zhang

Cao

et al. 2013

Chin. Sci. Bull.

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The radiolysis behavior of neat pyridinium ionic liquids (ILs) and their aqueous solutions was investigated using nanosecond pulse radiolysis techniques. Radiolysis of the ionic liquids, such as N-butylpyridinium tetrafluoroborate (BuPyBF 4 ), resulted in the formation of solvated electrons and organic radicals. Solvated electrons reacted with the pyridinium moiety to produce a pyridinyl radical, which can transfer electrons to various acceptors. The electron-transfer rate constants of the solvent-derived butylpyridinyl radicals in BuPyBF 4 and in several compounds (for example, duroquinone, 4,4′-pyridine, benzophenone, and 1,1′-dimethyl-4,4′-bypyridinium dichloride) (k of the order 10 8 L/(mol s) were lower than those measured in water and in i-PrOH but were significantly higher than the diffusion-controlled rate constants estimated based on viscosity. The electron-transfer rate constants in neat BuPyBF 4 were one order of magnitude faster than the diffusion-controlled values. This finding suggests that BuPyBF 4 acts not only as solvent but also as active solute, such as in solvent-mediated reactions. These reactions result in electrons reaching their final destinations via intervening pyridinium groups without requiring the diffusion of a specific radical. In recent years, ionic liquids (ILs) have become the most studied class of solvents and are considered valid potential substitutes of many volatile organic solvents [1][2][3]. ILs are salts and thus are ionic compounds in liquid form at or near room temperature. ILs exhibit several unique thermophysical properties owing to their asymmetrical structures and the charge dispersion of their organic and inorganic ions. These compounds do not evaporate at ambient temperature and have relatively high thermal stability, high ionic conductivity, and large liquid temperature range. ILs also demonstrate excellent solvent quality for many types of compounds. Traditional methods of chemical kinetics must be applied to the study of IL chemical reactivity to exploit properly the potential of these solvents. In this work, pulse radiolysis techniques were used to observe the electron-transfer reactivity of N-butylpyridinium tetrafluoroborate (BuPyBF 4 ) ILs with several transient species. Pulse radiolysis is a technique where samples are irradiated using a laser-generated beam of high-energy electrons and the species (electron, radicals, cations, etc.) are studied through their absorption spectra [4]. This technique is useful for studying reaction rates, particularly for very fast reactions such as redox reactions and reactions that contain short-lived species. Neta and co-workers [5,6] compared the reaction rate constants of ILs with those of traditional solvents (acetonitrile and alcohol) to determine the stability of ILs as alternative reaction solvents for specific reactions. They studied reaction kinetics in imidazolium salts and in methyltributylammonium bis (trifluoromethylsulfonyl)imide [7][8][9]. However, to the best of our knowledge, only a few studies focused on t...

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“…Recently, ionic liquids (ILs) attract more attention due to their low volatility, chemical stability, high thermal stability and ionic conductivity, etc [7][8][9]. Thus, ILs have become an alternative replacement for volatile organic compounds.…”

mentioning

confidence: 99%

Ionic liquids as green reaction media for synthesis of poly(aryl ether ketone)s

Wang

Liu

2013

Chin. Sci. Bull.

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Poly(aryl ether ketone)s (PAEKs) were successfully synthesized via nucleophilic aromatic substitution (S N AR) mechanism, using ionic liquids as green reaction media. The influence of various reaction parameters including monomer concentration, dehydration time, polymerization temperature and duration, IL's cations and anions nature, upon PAEKs molecular weight was investigated. In addition, the peculiarities of hydrogen-bonding ability of ILs were investigated. The interaction of 2,2-bis(4-hydroxyphenyl) propane (bisphenol A) with ILs has a strong influence on PAEKs synthesis. Various moderate molecular weight PAEKs have been obtained in high yields with molecular weights ranging from 10000 to 18000 g mol 1 .high performance polymers, ionic liquids, poly(aryl ether ketone)s, polycondensation Citation:Wang J, Liu Z P. Ionic liquids as green reaction media for synthesis of poly(aryl ether ketone)s.

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Pulse radiolysis studies of functionally substituted imidazolium-based ionic liquids

Cited by 6 publications

References 25 publications

Polymerization of Room-Temperature Ionic Liquid Monomers by Electron Beam Irradiation with the Aim of Fabricating Three-Dimensional Micropolymer/Nanopolymer Structures

Polymerization of Room-Temperature Ionic Liquid Monomers by Electron Beam Irradiation with the Aim of Fabricating Three-Dimensional Micropolymer/Nanopolymer Structures

Electron transfer in N-butylpyridinium tetrafluoroborate ionic liquid by pulse radiolysis

Ionic liquids as green reaction media for synthesis of poly(aryl ether ketone)s

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