Article
Chemistry, Multidisciplinary
Oliver S. Hammond, Guillaume Bousrez, Filip Mehler, Sichao Li, Manishkumar R. Shimpi, James Doutch, Leide Cavalcanti, Sergei Glavatskih, Oleg N. Antzutkin, Mark W. Rutland, Anja-Verena Mudring
Summary: A series of 19 ionic liquids based on phosphonium and imidazolium cations with orthoborate anions were synthesized and studied. The formation of well-defined complex phases in pure bulk orthoborate-based ILs is heavily influenced by the cation and the ability to form H-bonding networks.
Article
Chemistry, Physical
Livia Salvati Manni, Caitlin Davies, Kathleen Wood, Salvatore Assenza, Rob Atkin, Gregory G. Warr
Summary: The forces governing lipid self-assembly in ionic liquids are similar to water, but differences in their balance can lead to unexpected behavior. Experimental findings show that phospholipids in the protic ionic liquid ethylammonium nitrate exhibit unusual self-assembly structures and complex phase behavior different from that in water.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2023)
Article
Chemistry, Physical
Diego Pontoni, Marco DiMichiel, Moshe Deutsch
Summary: X-ray scattering was used to investigate the nanoscale layering of binary mixtures of [C(n)mim][NTf2] room temperature ionic liquids (RTILs) with n = 8, 12. It was found that the lateral structure of the layers is dominated by the Coulomb interaction of the common headgroups in the polar slab and the van der Waals interaction of the chain-chains in the apolar slab, with the longitudinal layer spacing decreasing with increasing mole fraction x. These deviations from ideal mixing and the hierarchical order of RTILs support an interdigitated chain packing in the apolar slab.
JOURNAL OF MOLECULAR LIQUIDS
(2021)
Article
Chemistry, Physical
Diego Pontoni, Marco DiMichiel, Moshe Deutsch
Summary: The nanoscale structure of equimolar binary mixtures [C(12)mim](0.5)[C(n)mim](0.5)[NTf2] was investigated and it was found that all mixtures exhibited local layering and thermal contraction as the temperature increased. The layer-spacing varied minimally with the alkyl chain length and the longer component dominated the layering. At low chain lengths, the structure resembled lipid bilayer solutions. The study also revealed a linear relationship between the layer spacing and the molecular-scale deviation from ideality, as well as the normalized chain length difference of the mixtures.
JOURNAL OF MOLECULAR LIQUIDS
(2022)
Article
Chemistry, Multidisciplinary
Hiroki Iwase, Munehiro Kubota, Tetsuji Itoh, Toshihiko Ogura, Takeo Ebina, Hiroyuki Ohtani, Keiichi Kurosaka, Yoshiaki Fukushima
Summary: The study found that the thixotropic characteristics of aqueous gels depend on the size and aggregation structure of hectorite particles, with different sizes exhibiting different behaviors in the gel.
Article
Multidisciplinary Sciences
Xiaoliang Wang, Lilin He, Jacob Sumner, Shuo Qian, Qiu Zhang, Hugh O'Neill, Yimin Mao, Chengxia Chen, Abdullah M. Al-Enizi, Ayman Nafady, Shengqian Ma
Summary: Immobilization of biomolecules into porous materials can improve their stability and ease of reuse. Metal-Organic Frameworks (MOFs) are promising for immobilizing large biomolecules, but their spatial arrangement within the pores is still not fully understood. In this study, researchers used in situ small-angle neutron scattering (SANS) to investigate the spatial arrangement of green fluorescent protein in a mesoporous MOF, revealing that protein molecules form assemblies through adsorbate-adsorbate interactions across pore apertures. This finding provides a crucial foundation for understanding protein structural basics in the confinement environment of MOFs.
NATURE COMMUNICATIONS
(2023)
Article
Chemistry, Physical
Hiroshi Abe, Fumiya Nemoto, Kosuke Hiroi, Kazuki Ohishi, Shinichi Takata
Summary: In this study, the spontaneous formation of monodispersive nanoconfined water in hydrophilic ionic liquid was investigated. The presence and behavior of water pocket in the ionic liquid were characterized using small-angle neutron scattering, revealing the dependence on water concentration and temperature. The findings contribute to a better understanding of the behavior and properties of water in ionic liquids.
JOURNAL OF MOLECULAR LIQUIDS
(2022)
Article
Chemistry, Multidisciplinary
Adrian Sanchez-Fernandez, Sylvain Prevost, Marie Wahlgren
Summary: This study demonstrates the potential of deep eutectic solvents as a medium for the storage and preservation of proteins in a concentrated regime, without the need for additional excipients, while maintaining stability and activity.
Article
Chemistry, Inorganic & Nuclear
Silke Wolf, Stefan Seidel, Jens Treptow, Ralf Koppe, Peter W. Roesky, Claus Feldmann
Summary: The novel tin(II) oxychloride [BMIm][Sn5O2Cl7] was obtained by reacting black SnO and SnCl2 in an ionic liquid, resulting in one-dimensional chains cut out of the two-dimensional layer structure of SnO, validated by dissolution experiments.
INORGANIC CHEMISTRY
(2022)
Article
Multidisciplinary Sciences
Michael Wagener, Stephan Foerster
Summary: The scattering of various types of radiation by matter is widely used for structural characterization. With the advancement of beam sources and detectors, scattering patterns can now be acquired quickly and at large sizes. However, the slow analysis of these patterns has become a bottleneck. In this study, an algorithm based on hypergeometric functions is introduced, providing a significant increase in computational speed compared to current methods. This algorithm enables real-time experiment feedback, analysis of large scattering datasets, and generation of training data for machine learning.
SCIENTIFIC REPORTS
(2023)
Article
Chemistry, Multidisciplinary
Cindy Y. Zheng, Yudong Yao, Junjing Deng, Soenke Seifert, Alexa M. Wong, Byeongdu Lee, Chad A. Mirkin
Summary: This study investigates the assembly of DNA-functionalized nanocubes in microscale square trenches on a DNA-functionalized substrate. The superlattices formed by the nanocubes are characterized using microfocus small-angle X-ray scattering and scanning electron microscopy. The results show that the nanocubes form cubic superlattices with square-prism morphology and an out-of-plane orientation to maximize DNA bonding. The study also uses X-ray ptychography to observe the internal structures of the superlattices and reveals that there may be subsurface grain boundaries in the SEM images. The study provides insights into the effect of lateral confinement on nanoparticle crystallization and demonstrates the use of X-ray ptychography in studying nanoparticle crystallization.
Article
Chemistry, Physical
Badri Narayanan Narasimhan, Alexander W. Dixon, Bradley Mansel, Andrew Taberner, Jitendra Mata, Jenny Malmstrom
Summary: This study investigates hydrogels made with semi-interpenetrating networks of oligomerized polyphenol tannic acid and poly(acrylamide). The presence of micron-sized hydrogen bonded clusters in the hydrogels and the breaking of these clusters above a critical solution temperature are observed using small angle X-ray scattering and small and ultra-small angle neutron scattering. Polarized optical microscopy shows enhanced anisotropy for gels with oligomerized tannic acid, and rheological studies reveal self-healing behavior of the gels. The findings from this study contribute to the rational design of hydrogels for biomedical applications.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2023)
Article
Polymer Science
Ana-Maria Putz, Adel Len, Laszlo Trif, Zsolt Endre Horvath, Laszlo Almasy
Summary: In this study, composite silica xerogels were synthesized using acid catalysis sol-gel method with ionic liquids as co-solvents, catalysts, and pore templates. The xerogels prepared with different ionic liquid templating agents exhibited variations in morphology and thermal behavior.
Article
Chemistry, Multidisciplinary
Yuval Simha, Gil Daniels, Amalya Goldman, Elihay Kuniavsky, Dmitry Tsvelikhovsky
Summary: A new strategy for direct access to fully substituted polycyclic imidazolium salts using alpha-enaminones and proline as the reagents is reported. This open-flask operation is a catalyst-, metal-, and Lewis acid-free green process, which does not require an ion-exchange step. It can produce good yields with minimal formation of side products, and is not limited to aryl substituents.
Article
Energy & Fuels
J. Jennings, D. J. Growney, H. Brice, O. O. Mykhaylyk, S. P. Armes
Summary: Asphaltenes, complex carbon-rich molecules found in crude oil, have a strong tendency to aggregate and phase separate. This causes issues in crude oil extraction, refining, and application. Understanding the morphology and mechanisms of asphaltene aggregation and designing stabilizers to prevent phase separation have been the focus of research. Imaging techniques and light scattering provide limited structural information, while small-angle scattering and X-ray diffraction offer a wealth of information about asphaltene structure.
Article
Chemistry, Multidisciplinary
Takayuki Kumada, Kazuhiro Akutsu, Kazuki Ohishi, Toshiaki Morikawa, Yukihiko Kawamura, Masae Sahara, Jun-ichi Suzuki, Naoya Torikai
JOURNAL OF APPLIED CRYSTALLOGRAPHY
(2019)
Article
Crystallography
Kosuke Kaneko, Kosuke Yamashita, Daiki Fujioka, Kimiyoshi Kaneko, Kiyomi Fuchigami, Takeshi Hashishin, Tomonori Hanasaki
Summary: The electrorheological properties of composite materials consisting of a nematic liquid crystal (LC) and gold nanoparticles (GNPs) coated with bistolane-based mesogenic groups were studied. The presence of GNPs led to a slightly enhanced ER effect compared to the nematic LC alone. The study demonstrates the potential of a hybrid system consisting of LCs and GNPs to yield a larger ER effect.
Article
Multidisciplinary Sciences
Masaki Uchida, Shin Sato, Hiroaki Ishizuka, Ryosuke Kurihara, Taro Nakajima, Yusuke Nakazawa, Mizuki Ohno, Markus Kriener, Atsushi Miyake, Kazuki Ohishi, Toshiaki Morikawa, Mohammad Saeed Bahramy, Taka-hisa Arima, Masashi Tokunaga, Naoto Nagaosa, Masashi Kawasaki
Summary: The study of the magnetic semiconductor EuAs revealed a new mechanism for inducing large anomalous Hall effect (AHE) in magnetic semiconductors through spin cluster scattering. This suggests potential for developing a field targeting diluted carriers strongly coupled to noncoplanar spin structures.
Article
Nanoscience & Nanotechnology
Eiji Nomura, Momoko Chiba, Sakoto Matsuo, Chiaki Noda, Satoru Kobayashi, Jayappa Manjanna, Yukihiko Kawamura, Kazuki Ohishi, Kosuke Hiroi, Jun-ichi Suzuki
Summary: In this study, polarized small-angle neutron scattering (SANS) experiments were conducted on cubic Fe3O4 submicron-sized particles at T = 10 K and 300 K. The results showed significant changes in the magnetic SANS intensities of magnetization components perpendicular and parallel to the magnetic field near the coercivity. Based on micromagnetic simulations, these observations were interpreted as magnetic structural changes and gradual tilting of the vortex core at low fields.
Article
Nanoscience & Nanotechnology
M. Ohkuma, M. Mito, M. Pardo, Y. Kousaka, S. Iwasaki, K. Ohishi, J. Akimitsu, K. Inoue, V Laliena, J. Campo
Summary: The phase diagram of MnSi oriented single crystals was investigated, and a new magnetic phase B-phase was discovered, characterized by a flat-valley-like anomaly in the in-phase component of the magnetization below the low temperature ferromagnetic (FFM) boundary.
Article
Chemistry, Physical
Izumi Umegaki, Kazuki Ohishi, Takehito Nakano, Shoichiro Nishimura, Soshi Takeshita, Akihiro Koda, Kazuhiko Ninomiya, M. Kenya Kubo, Jun Sugiyama
Summary: In this study, the intrinsic self-diffusion coefficient of Li+ in a battery anode material was investigated using negative and positive muon spin rotation and relaxation spectra. The results showed that muonic oxygen is immobile until the spinel decomposition temperature, while the mu(+) at an interstitial site diffuses at high temperatures. By analyzing the temperature dependence of the field fluctuation rate, it was confirmed that Li+ diffusion is responsible for the fluctuation in the internal nuclear magnetic field. The diffusion coefficient was estimated to be 8(2) x 10(-1)2 cm(2)/s at 300 K.
JOURNAL OF PHYSICAL CHEMISTRY C
(2022)
Article
Chemistry, Multidisciplinary
Takayuki Kumada, Daisuke Miura, Kazuhiro Akutsu-Suyama, Kazuki Ohishi, Toshiaki Morikawa, Yukihiko Kawamura, Jun-ichi Suzuki, Takayuki Oku, Naoya Torikai, Tomotake Niizeki
Summary: This work demonstrates the advantage of spin-contrast-variation neutron reflectivity (NR) in the structure analysis of a buried interface in a bilayer film. The study shows that as the proton polarization changes, the NR curve of the bilayer film varies significantly and cannot be reproduced using a standard bilayer model. By observing the shift in oscillation, it was found that the density of the organic layer decreased near the interface, but the resin did not permeate the low-density inorganic layer.
JOURNAL OF APPLIED CRYSTALLOGRAPHY
(2022)
Article
Chemistry, Physical
Kazuki Ohishi, Daisuke Igarashi, Ryoichi Tatara, Izumi Umegaki, Akihiro Koda, Shinichi Komaba, Jun Sugiyama
Summary: The self-diffusion coefficient of Li+ ions in LixCoO2 was determined using a positive muon spin rotation and relaxation technique. The results showed that DLiJ increased as the Li content decreased and exhibited two small minima at x≈2/3 and x≈1/2. Furthermore, DLiJ showed a similar trend to the self-diffusion coefficient estimated using electrochemical techniques.
ACS APPLIED ENERGY MATERIALS
(2022)
Article
Chemistry, Physical
Shunsuke Hashimoto, Satoshi Yamaguchi, Masashi Harada, Kenji Nakajima, Tatsuya Kikuchi, Kazuki Ohishi
Summary: In recent research, it has been found that nanofluids composed of base liquids and dispersed solid nanoparticles show an anomalous improvement in thermal conductivity compared to the predicted value. By using various techniques, the study provides solid evidence that the vibrational behavior of liquid molecules around nanoparticles contributes significantly to the increased thermal conductivity. The vibration of liquid molecules is found to be equivalent to phonon conduction in solids, leading to a solid-like behavior in the liquid.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2023)
Article
Materials Science, Multidisciplinary
Satoru Kobayashi, Eiji Nomura, Momoko Chiba, Yukihiko Kawamura, Kazuki Ohishi, Kosuke Hiroi, Jun-ichi Suzuki
Summary: We conducted polarized small-angle and wide-angle neutron scattering experiments on 420 nm-sized hollow Fe3O4 spherical particles. Each particle is a mesocrystal composed of small nanoparticles with the same crystallographic orientation. We used polarized neutron experiments to evaluate the magnetic correlations during magnetization process. Our results show that the perpendicular magnetization component maximizes around zero applied field, while the parallel component minimizes, both below and above the Verwey transition temperature. Our calculations suggest the reorientation of the vortex core towards the magnetocrystalline anisotropy axis at low applied fields. We also found that the magnetic domain length obtained from wide-angle scattering is comparable to the size of the small nanoparticles forming the hollow sphere, indicating that magnetic correlations within the nanoparticles retain during magnetization process.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2023)
Article
Physics, Multidisciplinary
H. Takagi, R. Takagi, S. Minami, T. Nomoto, K. Ohishi, M. -t. Suzuki, Y. Yanagi, M. Hirayama, N. D. Khanh, K. Karube, H. Saito, D. Hashizume, R. Kiyanagi, Y. Tokura, R. Arita, T. Nakajima, S. Seki
Summary: The spontaneous topological Hall effect in triangular lattice compounds CoTa3S6 and CoNb3S6 is experimentally demonstrated, combining non-coplanar antiferromagnetic order with finite scalar spin chirality in the absence of a magnetic field. These compounds exhibit unconventionally large spontaneous Hall effects despite their small net magnetization, and the mechanism behind this phenomena is explained by the topological Hall effect associated with scalar spin chirality. The results suggest that the scalar spin chirality mechanism offers a promising route for the realization of a giant spontaneous Hall response in compensated antiferromagnets.
Article
Chemistry, Physical
Takayuki Kumada, Hiroshi Nakagawa, Daisuke Miura, Yurina Sekine, Ryuhei Motokawa, Kosuke Hiroi, Yasuhiro Inamura, Takayuki Oku, Kazuki Ohishi, Toshiaki Morikawa, Yukihiko Kawamura, Kiyoshi Kawai
Summary: Spin-contrast-variation (SCV) small-angle neutron scattering (SANS) is a technique used to determine the nanostructure of composite materials by analyzing the scattering of polarized neutrons. In this study, SCV-SANS was used to analyze the structure of nanoice crystals in rapidly frozen sugar solutions. The results showed that the nanoice crystals had a planar structure with a radius larger than several tens of nanometers and a thickness of 2.5±0.5 nm. Furthermore, the glucose molecules were found to preferentially bind to a specific face of the nanoice crystals, inhibiting growth perpendicular to that face.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2023)
Article
Nanoscience & Nanotechnology
Y. Miyagi, J. Jiang, K. Ohishi, Y. Kawamura, J. Suzuki, D. R. Alshalawi, J. Campo, Y. Kousaka, Y. Togawa
Summary: Chiral helimagnetism was investigated in MnTa3S6, revealing the presence of harmonic chiral helimagnetic order and chiral soliton lattice phase. The observed features in MnTa3S6 are distinct from other dichalcogenides. The tunable capability of the number of chiral solitons in CSL system at zero magnetic field may be useful for memory device applications.
Article
Chemistry, Physical
Kazuki Ohishi, Daisuke Igarashi, Ryoichi Tatara, Izumi Umegaki, Jumpei. G. G. Nakamura, Akihiro Koda, Martin Mansson, Shinichi Komaba, Jun Sugiyama
Summary: In this study, the self-diffusion coefficient of Na+ in P2-NaxCoO2 was measured using an operando muon spin rotation and relaxation (mu+ SR) technique. The results showed that DNaJ ranged from 7 x 10(-12) to 2 x 10(-11) cm2/s, decreasing with decreasing Na content x. However, the electrochemical technique determined a higher apparent self-diffusion coefficient (D-Na(J),app) than DNaJ, except at x = 1/2, 2/3, and approx. 0.72. The mu+ SR measurements also revealed a strong temperature dependence of Na dynamics near room temperature.
ACS APPLIED ENERGY MATERIALS
(2023)
Article
Physics, Multidisciplinary
Taro Nakajima, Tatsuro Oda, Masahiro Hino, Hitoshi Endo, Kazuki Ohishi, Kazuhisa Kakurai, Akiko Kikkawa, Yasujiro Taguchi, Yoshinori Tokura, Taka-hisa Arima
PHYSICAL REVIEW RESEARCH
(2020)
