Article
Chemistry, Multidisciplinary
Sheng Liu, Hong Yu, Ya-jie Ma, Ya-qi Cai
Summary: This study established a method combining ion chromatography and solid-phase extraction to analyze quaternary ammonium ionic liquid cations in river water samples. The method achieved a detection limit of 0.003 mg/L, meeting the requirements for quantitative analysis.
ENVIRONMENTAL CHEMISTRY LETTERS
(2021)
Article
Chemistry, Physical
Thomas Myrdek, Crisan Popescu, Werner Kunz
Summary: Thirty-nine different Ionic Liquids were synthesized with symmetric quaternary ammonium cations and alkylethercarboxylates as anions. Various physical chemical properties were determined, such as density, viscosity, conductivity, and melting behavior. The study found that density is linearly dependent on temperature, viscosity is affected by carbon chain length, and conductivity is dependent on compound structure.
JOURNAL OF MOLECULAR LIQUIDS
(2021)
Article
Biochemistry & Molecular Biology
Rabia Hassan, Farzana Nazir, Mah Roosh, Arshemah Qaisar, Uzma Habib, Abdulrahim A. Sajini, Mudassir Iqbal
Summary: Ionic liquids (ILs) have emerged as promising alternatives to existing antibiotics and antiseptics due to their excellent antibacterial activity. In this study, three series of ILs were synthesized using a green-chemistry-synthesis method, and their structures were confirmed through spectroscopic analysis. The ILs exhibited significant antibacterial activity against various pathogenic bacteria, with imidazolium cations and NTf2- and HSO4- anions showing the highest efficacy. In silico studies further demonstrated that these ILs can potentially be used as antibiotics.
Article
Chemistry, Physical
Forouzan Arashnezhad, Morteza Zare
Summary: The study investigated the effects of alkyl chain length and ether functionalization on the geometrical and electronic structures of ammonium-based ionic liquids. It was found that the interaction energy between cations and chloride anions decreases with increasing side-chain length. Additionally, molecular electrostatic potential maps were used to identify favorable interaction sites of cations.
CHEMICAL PHYSICS LETTERS
(2021)
Article
Chemistry, Multidisciplinary
Michael Kuettinger, Paulette A. Loichet Torres, Emeline Meyer, Peter Fischer
Summary: This study systematically investigates the properties of bromine complexing agents (BCA) in aqueous electrolytes for hydrogen bromine flow batteries. The aim is to reduce bromine's vapour pressure and form an insoluble and liquid fused salt. The concentrations, composition, conductivity, and viscosity of the fused salt are examined using 7 BCAs at different state of charge in HBr/Br-2/H2O electrolytes. The research shows that the conductivity and viscosity of the fused salts are strongly influenced by the alkyl side chain length of the BCAs and the distribution of polybromides.
CHEMISTRY-A EUROPEAN JOURNAL
(2022)
Article
Chemistry, Physical
Hongling Fang, Yi Li, Songwei Zhang, Qi Ding, Litian Hu, Kuan Lu
Summary: This study investigates the lubrication behavior of ionic liquids (ILs) as lubricant additives through experiments and molecular dynamics simulation. The results show that ILs with short-chain anions exhibit better lubricating performance, which is attributed to the formation of a denser protective layer that promotes tribochemical reactions at the frictional interface.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2022)
Article
Chemistry, Physical
Quan Liu, Xuan Zhou, Song-Ru Yang, Wu Zhang, He Liu, Ce-An Guo, Jian Zhang
Summary: This paper studies the influence of temperature, organic solvents (benzene and toluene), and halogen salts on the electric conductivity of four types of quaternary ammonium salt-type AlCl3 ionic liquids. The experimental results indicate that the conductivity of each ionic liquid system increases with temperature. The addition of benzene (or toluene or ethylbenzene) to the ionic liquids leads to a significant increase in electric conductivity, reaching a maximum value of 14.5 mS/cm when the mixed system contains about 50 vol % of benzene (or toluene or ethylbenzene).
RUSSIAN JOURNAL OF PHYSICAL CHEMISTRY A
(2023)
Article
Chemistry, Physical
Szilvia Vavra, Anna Martinelli
Summary: In this study, vertically oriented and hexagonally ordered pores have been synthesized and investigated in mesoporous silica thin films. Different alkyl-imidazolium ionic liquids have been used as templates to explore the effect of chain length and protic character on film formation and pore order. Various metal substrates, including indium titanium oxide (ITO) and gold, were employed for film deposition. Complementary experimental methods such as GISAXS, Infrared spectroscopy, and cyclic voltammetry were utilized to thoroughly investigate the morphology and permeability of the deposited thin films.
JOURNAL OF MOLECULAR LIQUIDS
(2022)
Article
Chemistry, Multidisciplinary
Daniel Rauber, Andreas Hofmann, Frederik Philippi, Christopher W. M. Kay, Tatiana Zinkevich, Thomas Hanemann, Rolf Hempelmann
Summary: Research investigated the suitability of a series of ionic liquids with small ammonium cations for potential battery applications by studying their thermal and transport properties, finding that they can potentially replace traditional electrolytes under certain conditions.
APPLIED SCIENCES-BASEL
(2021)
Article
Chemistry, Physical
Salhah H. Alrefaee
Summary: Through DFT computational study, it was found that imidazolium and pyridinium based ionic liquids exhibit good anticorrosive potential, with corrosion inhibition performance depending on the nature of alkyl groups and halide ions. Among the studied ionic liquids, certain compounds were found to show the best corrosion inhibition performance in both imidazolium and pyridinium based categories.
JOURNAL OF MOLECULAR LIQUIDS
(2021)
Article
Chemistry, Multidisciplinary
Xiuling Fan, Ming Zhao, Tianhao Li, Lian Ying Zhang, Maoxiang Jing, Weiyong Yuan, Chang Ming Li
Summary: This study successfully controlled the fabrication of N-rich carbon supported graphene as a carrier for Pt NP chains, improving the catalytic activity for MOR. The new nanohybrid exhibited superior catalytic performance, enhancing CO tolerance and improving the intrinsic activity of Pt.
Article
Chemistry, Multidisciplinary
Olga D. Bakulina, Mikhail Yu. Ivanov, Sergey A. Prikhod'ko, Nicolay Yu. Adonin, Matvey V. Fedin
Summary: Ionic liquids (ILs) can form various nanostructures due to their amphiphilic nature. In this study, we investigate the structural anomalies in zwitterionic IL glasses (ZILs), where the cation and anion are bound in a single molecule. The binding restricts mutual diffusion of cations and anions, leading to modification of nano-ordering and structural anomalies compared to common ILs. This work expands the understanding of structural anomalies in IL glasses and suggests new routes to tune their properties.
Article
Biochemistry & Molecular Biology
Oriele Palumbo, Annalisa Paolone, Frederik Philippi, Daniel Rauber, Tom Welton
Summary: This study investigates the impact of ionic liquid (ILs) design on the mechanical properties and ion dynamics of ILs, while considering the relationships between different mechanical and transport properties. The mechanical properties of quaternary ILs with rigid anions are studied using Dynamical Mechanical Analysis (DMA), and the results are compared with rheological and transport properties measured through viscosity, conductivity, and diffusion coefficient measurements. The temperature dependence of different variables is well described by the Vogel-Fulcher-Tammann model. The occurrence of a relaxation process in the mechanical spectra of all measured liquids is attributed to a diffusive process when the ion dynamics are not affected by fast structural reorganization of flexible anions at a local level.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2023)
Article
Chemistry, Physical
Lanyun Wang, Lingshuang Li, Qinghui Fan, Tingxiang Chu, Yan Wang, Yongliang Xu
Summary: This study investigated the thermal stability, flammability and decomposition products of five quaternary ammonium ionic liquids using different analytical techniques. The results showed that the thermal stability was mainly influenced by the choice of anion and the length of the alkyl chain in the cation. The longer alkyl chains contributed to higher heat release rates and shorter ignition times. Moreover, the decomposition products included fluoroalkanes, bromoalkanes and olefins.
JOURNAL OF MOLECULAR LIQUIDS
(2023)
Article
Chemistry, Physical
Hua Li, Jianan Wang, Gregory G. Warr, Rob Atkin
Summary: The dynamics of self-assembled liquid nanostructures of ionic liquids near a mica surface were determined using video-rate atomic force microscopy (AFM) data. The AFM videos revealed that the nanostructures near the surface diffused much slower than individual ions in the bulk. This finding has important implications for processes involving concentrated electrolyte interfacial dynamics.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2023)
Article
Engineering, Multidisciplinary
Haru Kitaoka, Ken-ichi Amano, Naoya Nishi, Tetsuo Sakka
Summary: The study improved the Nelder-Mead method by using DIIS technique, which showed better performance in high-dimensional objective functions compared to the original NM method. The application of DIIS eliminated the long tails of runtime distributions in the NM method, and it also proved to be effective in the quasi-gradient method developed as an improvement of NM.
OPTIMIZATION AND ENGINEERING
(2022)
Article
Chemistry, Multidisciplinary
Naoya Nishi, Junya Uchiyashiki, Tatsuro Oda, Masahiro Hino, Norifumi L. Yamada
Summary: By using different metal films and selecting IL ions with large size and SLD difference, the sensitivity towards the IL electric double layer structure has been successfully enhanced. Observations in the study showed specific adsorption of IL cations on the electrode and overscreening in the overlayers up to the third ionic layer induced by the cation-rich first layer.
BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN
(2021)
Article
Chemistry, Multidisciplinary
Ippeti Koya, Yuko Yokoyama, Tetsuo Sakka, Naoya Nishi
Summary: Au nanofiber/fullerene nanowhisker composites were prepared at the liquid/liquid interface between an ionic liquid and water via the reductive deposition of Au nanofibers on fullerene nanowhiskers.
Article
Chemistry, Analytical
Shiwei Zhang, Hiromasa Baba, Tetsuo Sakka, Naoya Nishi
Summary: The interfacial dielectric relaxation of ionic liquids at the gold electrode interface was investigated using electrochemical surface plasmon resonance. The study revealed a fast relaxation process mainly attributable to ionic reorientation, followed by an ultraslow relaxation process due to ionic translation, with different directions of SPR shift for positive and negative potential steps.
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
(2022)
Article
Chemistry, Physical
Shiwei Zhang, Takashi Yamazawa, Tetsuo Sakka, Naoya Nishi
Summary: In this study, electrochemical surface plasmon resonance (ESPR) measurements were used to sensitively detect the surface roughness change of the lithium electrode in the deposition/dissolution processes in ionic liquids. The results showed that ESPR was an effective in situ method to track the changes in refractive index at the IL/electrode interface during the deposition/stripping processes. The comparison with simulations indicated that the surface of the deposited Li layer was smoothened during the period after the Li deposition and before the Li dissolution in cyclic voltammograms.
JOURNAL OF PHYSICAL CHEMISTRY C
(2022)
Article
Electrochemistry
Shiwei Zhang, Tetsuo Sakka, Naoya Nishi
Summary: By combining electrochemical surface plasmon resonance with normal pulse and differential pulse techniques, the potential dependence of the dynamics of the interface structure of an ionic liquid was investigated. The fast response originates from the orientation, distortion, and electronic polarization of ions, while the slow response is due to ionic rearrangement.
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
(2022)
Article
Electrochemistry
Masaki Matsui, Yuki Orikasa, Tomoki Uchiyama, Naoya Nishi, Yuto Miyahara, Misae Otoyama, Tetsuya Tsuda
Summary: In this paper, we presented a series of in situ/operando techniques for battery applications, including Li-ion batteries, solid-state batteries, and other beyond Li-ion batteries. These techniques are important tools for the development of advanced battery materials.
Article
Electrochemistry
Masaki Matsui, Yuki Orikasa, Tomoki Uchiyama, Naoya Nishi, Yuto Miyahara, Misae Otoyama, Tetsuya Tsuda
Summary: Spectroscopic and microscopic techniques are complementary to electrochemical studies, providing information about the chemical structure of active species not obtained from traditional electrochemical data. This paper presents the fundamental theory, cell design concepts, and measurement tips of various spectroscopic and microscopic techniques, including X-ray absorption spectroscopy, infrared spectroscopy, surface plasmon resonance, Raman spectroscopy, confocal microscopy, and electron microscopy. The importance of cell design in enabling these measurements is highlighted, along with the introduction of advanced techniques from recent studies.
Editorial Material
Electrochemistry
Naoya Nishi, Yohei Kuroyama, Naohiro Yoshida, Yuko Yokoyama, Tetsuo Sakka
Summary: This article presents the research achievements of Dr. Naoya Nishi's team from Kyoto University. The cover picture shows the water-free liquid-liquid interface between an ionic liquid and oil, where base metal nanostructures can be formed via the electron transfer reaction between metal ions on the ionic liquid side and reducing agents on the oil side of the interface.
Article
Electrochemistry
Naoya Nishi, Yohei Kuroyama, Naohiro Yoshida, Yuko Yokoyama, Tetsuo Sakka
Summary: In this study, a novel waterfree ITIES method was introduced to overcome the limitation of metal deposition at the interface. Zinc, a base metal, was successfully deposited at the ionic liquid/oil interface. The morphology of zinc nanostructures and the reaction mechanism involving electron and ion transfer reactions across the interface were investigated.
Article
Chemistry, Multidisciplinary
Ken-ichi Amano, Satoshi Furukawa, Yuto Kubo, Yuka Nakamura, Rina Ishii, Ayane Tanase, Masahiro Maebayashi, Tomohiko Hayashi, Naoya Nishi, Tetsuo Sakka
Summary: In this study, the physical adsorption of colloidal particles on a flat wall was calculated using the integral equation theory. It was found that small particles are more easily adsorbed, which is contrary to traditional theories. Theoretical analysis revealed that this reversal phenomenon originates from the nonadditivities of the particle sizes. A method to analyze the size nonadditivity hidden in model pair potentials was invented based on the knowledge obtained from this study.
Article
Spectroscopy
Weilun Gu, Naoya Nishi, Zongyu Hou, Zhe Wang, Tetsuo Sakka
Summary: The high signal uncertainty of laser-induced breakdown spectroscopy (LIBS) hinders its analytical performance and large-scale application. The complexity of plasma evolution hampers fundamental research to reduce signal uncertainty. Error propagation analysis offers a new perspective by linking signal uncertainty with plasma property fluctuations, but further investigation is urgently needed due to limitations of plasma diagnostic techniques. A spectrum fitting model for optically thick and homogeneous plasmas was proposed in this study, providing more reliable plasma properties for error propagation analysis. The model was applied to laser-induced copper plasmas and revealed the significant influence of columnar total number density fluctuation and correlation term of temperature and columnar total number density on signal uncertainty, as well as the suppression effect of self-absorption.
SPECTROCHIMICA ACTA PART B-ATOMIC SPECTROSCOPY
(2023)
Article
Chemistry, Physical
Shiwei Zhang, Naoya Nishi, Seiji Katakura, Tetsuo Sakka
Summary: Molecular dynamic simulations were conducted on a charged graphene electrode with the ionic liquid [C(4)mim(+)][TFSA(-)] to analyze static differential capacitance, providing insights into the surface charge density, ionic distributions, and ionic orientation essential for understanding SPR angle shifts in ESPR. The simulations revealed that changes in ionic concentrations of the first ionic layer play a key role in the SPR angle shift, highlighting the importance of ion distributions and orientations in the evaluation of ESPR.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2021)
Article
Chemistry, Analytical
Nan Li, Naoya Nishi, Ronger Zheng, Tetsuo Sakka
Summary: The study reveals that short pulses create weak emission plasma with short lifespan, while long pulses generate strong emission with longer lifespan. Long pulses can increase the spectral line intensity by more than 6 times for high-energy transition levels, allowing for detection of clear atomic lines of oxygen in water.
JOURNAL OF ANALYTICAL ATOMIC SPECTROMETRY
(2021)
Article
Chemistry, Analytical
Nan Li, Naoya Nishi, Ronger Zheng, Tetsuo Sakka
Summary: The study found that using laser pulses with a duration of 100 ns or longer can better detect the atomic lines of H and O in water, resulting in higher emission intensity and longer plasma persistence time. By using O as an internal standard, the quantification performance showed better linearity, higher stability, and lower limit of detection.
JOURNAL OF ANALYTICAL ATOMIC SPECTROMETRY
(2021)