Article
Chemistry, Analytical
S. Diaz-Coello, M. M. Afonso, J. A. Palenzuela, E. Pastor, G. Garcia
Summary: The study demonstrates that the ionic liquid can affect the growth of surface oxides on the composite material, leading to a modification of its catalytic performance towards the hydrogen evolution reaction (HER).
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
(2021)
Article
Materials Science, Paper & Wood
Tyler Cosby, Ashlee Aiello, David P. Durkin, Paul C. Trulove
Summary: The decrease in crystallinity of a cotton thread exposed to an ionic liquid was investigated using Raman spectral mapping. Heterogeneous decrystallization was observed with extended treatment times, where only fibers at the outer edge of the thread decrystallize. This study provides new insights into the effects of treatment conditions on the crystallinity of cellulose materials.
Article
Physics, Applied
Dimitra K. Manousou, Spiros Gardelis, Maria Calamiotou, Vlassis Likodimos, Emmanuel Syskakis
Summary: The study demonstrates that electric current can induce a two-step modification of the Metal-Insulator Transition (MIT) in VO2 films, leading to Joule heating effects and structural phase transitions. By controlling current in synergy with ambient temperature, a larger part of the film can be transformed into a rutile metallic phase.
JOURNAL OF APPLIED PHYSICS
(2021)
Article
Chemistry, Physical
Yukihiro Yoshimura, Takahiro Takekiyo, Atsushi Yamada, Kazuyoshi Kaneko, Kodai Kikuchi, Ryo Fukaya, Kosuke Kaneko, Tomonori Hanasaki, Akio Shimizu
Summary: By using Raman spectroscopy and molecular dynamics (MD) simulations, we investigated the conformational equilibrium of cations in N,N-diethyl-N-methyl-N-(2-methoxyethyl) ammonium ([DEME][X], X = BF4 and I) ionic liquid (IL)-water mixtures as a function of water concentration. We observed that the folded form of the [DEME] cation remained stable regardless of the anion species and its proportion in the mixtures did not change significantly with water concentration. This behavior was different from that of imidazolium IL-water mixtures, where the equilibrium shifted with water concentration. Interestingly, the stability of the [DEME] cations in the mixtures was unrelated to the states of water molecules. We speculated that the intramolecular attractive interaction between the N and O atoms in the [DEME] cation might play a key role in maintaining the stability of the folded form.
JOURNAL OF MOLECULAR LIQUIDS
(2023)
Article
Chemistry, Multidisciplinary
Haonan Wang, Kenneth L. Kearns, Aixi Zhang, Ahmad Arabi Shamsabadi, Yi Jin, Aaron Bond, Steven M. Hurney, Carlos Morillo, Zahra Fakhraai
Summary: The effect of nanoporous confinement on the glass transition temperature depends on the type of porous media. The study showed that molecular glass confined in concave pores has a higher Tg due to more planar conformations and slower relaxation dynamics. These effects are entropic in nature and are due to conformational changes at the molecular level.
Article
Materials Science, Multidisciplinary
D. Kurchavov, M. Haddad, V. Lair, P. Volovitch
Summary: This study found that the hydrogen evolution of commercial purity Mg increased significantly under anodic polarization in ionic liquids containing carboxylate and Mg(OH)(2), while Mg-alloy AZ61 did not. This indicates a strong difference in the interaction between magnesium and water in IL-water mixtures compared to inorganic aqueous solutions.
Article
Physics, Applied
Yijin Zhang, Dong Zhao, Qixing Wang, Jurgen H. Smet
Summary: Semiconducting group-VI-B transition metal dichalcogenides (TMDs) with the triangular prism crystal structure exhibit unique features. The recent observation of an Ising superconducting transition at high carrier densities induced through the field effect in an electric double layer transistor (EDLT) is a notable example. However, whether the original crystal structure remains unchanged under heavy doping has not been verified. This study provides experimental evidence that the initial triangular prismatic crystal structure of MoS2, a representative member of the TMD family, is not altered during operation of the EDLT even when inducing the superconducting transition.
APPLIED PHYSICS LETTERS
(2022)
Article
Materials Science, Multidisciplinary
Yuwaraj K. Kshetri, Bina Chaudhary, Takashi Kamiyama, Tae-Ho Kim, Federico Rosei, Soo Wohn Lee
Summary: BiVO4 undergoes a reversible ferroelastic phase transition at around 530K, and the most intense Raman band at 829 cm(-1) shows interesting temperature dependency. By distinguishing different linear regimes and extrapolating, the transition temperature is successfully identified at 530K.
Article
Spectroscopy
Monika Trzebiatowska
Summary: The series of MeA(2)KFe(CN)(6), with different MeA cations, were studied to elucidate phase transition mechanisms at different temperatures. The order-disorder process was identified in all cases. Different models were proposed based on dynamic effects observed in the spectra, showing how different cations affect thermal behavior and hydrogen bonding, influencing the motion of organic cations.
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
(2021)
Article
Spectroscopy
Edgar Mosquera-Vargas, Carlos Marin
Summary: The structural changes of n-alkanes during melting and freezing processes were investigated using Raman spectroscopy. Different n-alkanes undergo different phase transitions, including the rotator phase and the alpha phase. During freezing, even n-alkanes form the rotator phase before the crystalline solid phase.
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
(2022)
Article
Multidisciplinary Sciences
Xiaodong Yao, Yinxin Bai, Cheng Jin, Xinyu Zhang, Qunfei Zheng, Zedong Xu, Lang Chen, Shanmin Wang, Ying Liu, Junling Wang, Jinlong Zhu
Summary: The authors of this study found that CuInP2S6 exhibits an anomalous enhancement of spontaneous polarization under hydrostatic pressure. This is in contrast to the typical pressure-induced suppression of ferroelectricity. The increase in polarization is attributed to the spatial instability of Cu cations and the increase of Cu occupancy at the interlayer site. These findings provide valuable insights into the behavior of this van der Waals material and suggest new avenues for improving its properties.
NATURE COMMUNICATIONS
(2023)
Article
Engineering, Chemical
Ch Venkateswara Rao, Alok Rout, Anil Boda, Sk Musharaf Ali, K. A. Venkatesan
Summary: The introduction of tetra-alkyl ammonium ionic liquids has shown exceptional extraction efficiency for actinides due to their unique mechanisms that differ from traditional imidazolium ionic liquids. The use of these hydrophobic ionic liquids has the potential to overcome the limitations associated with cation exchange mechanisms in metal extraction processes.
SEPARATION AND PURIFICATION TECHNOLOGY
(2021)
Article
Chemistry, Physical
Duo Zhang, Hairan Zhang
Summary: An IL-based liposome was prepared through self-assembly and used as a carrier to create an isotropic SERS platform. Gold nanoparticles were grown and stabilized on the surface using the coordination effect of IL. The confinement effect of the isotropic surface improved the detection sensitivity and reproducibility of the SERS signal. The co-assembled platform exhibited an ideal enhancement factor and a low detection limit.
JOURNAL OF MOLECULAR LIQUIDS
(2023)
Article
Chemistry, Physical
Lia Zaharani, Mohd Rafie Johan, Salam Titinchi, Nader Ghaffari Khaligh
Summary: This study demonstrates the formation of a new ionic liquid, 4-dimethylaminopyridinium chlorosulfonate, through the reaction between chlorosulfonic acid and DMAP. Other possible reaction products were ruled out based on spectroscopic analyses. The thermal behavior and stability of the new ionic liquid were investigated, and a possible degradation mechanism was proposed.
JOURNAL OF MOLECULAR LIQUIDS
(2022)
Article
Chemistry, Multidisciplinary
Yingxue Ma, Haozheng Li, Zhou Gong, Shuai Yang, Ping Wang, Chun Tang
Summary: This study found that RNA molecules can self-assemble into different forms of droplets in the presence of Mg2+, accompanied by the clustering of nucleobases and the loss of canonical base-paired structure. The droplets first expand and then shrink to adopt hollow vesicle-like structures as the RNA/Mg2+ ratio changes.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2022)
