Article
Chemistry, Multidisciplinary
Ryosuke Takehara, Natsuki Kubo, Meguya Ryu, Suguru Kitani, Shusaku Imajo, Yoshiaki Shoji, Hitoshi Kawaji, Junko Morikawa, Takanori Fukushima
Summary: pi-Stacking, a structural motif in assemblies of aromatic compounds, plays a significant role in charge and exciton transport. However, its contribution to thermal transport is not well understood. In this study, the thermal transport through pi-stacked columns in a single-crystalline triphenylene was investigated. It was found that acoustic phonons are responsible for thermal transport in the pi-stacked columns, which exhibit crystal-like behavior. Additionally, intramolecular vibrations can also contribute to thermal transport by coupling with the acoustic phonons. In the direction perpendicular to the pi-stacked columns, an amorphous-like thermal transport behavior dominates.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
Article
Spectroscopy
Wang Chong, Wang Jing-hua, Li Dong-dong, She Jiang-bo
Summary: This study successfully improved the up-conversion luminescence performance of LiYF4:Yb3+/Ho3+ micron crystals by doping Gd3+, and found that the fluorescence intensity increased with the increase of Gd3+ doping concentration, reaching a maximum at 30 mol%.
SPECTROSCOPY AND SPECTRAL ANALYSIS
(2022)
Article
Materials Science, Multidisciplinary
Shang-Ju Chan, Jui-Cheng Kao, Po-Jung Chou, Yu-Chieh Lo, Jyh-Pin Chou, Michael H. Huang
Summary: Research has shown that functionalized Cu2O crystals exhibit significantly improved photocatalytic activity. The modified Cu2O surfaces have good electron transfer properties and can generate hydroxyl radicals, enhancing the efficiency of the photocatalytic reactions.
JOURNAL OF MATERIALS CHEMISTRY C
(2022)
Article
Physics, Multidisciplinary
Florian Knoop, Thomas A. R. Purcell, Matthias Scheffler, Christian Carbogno
Summary: In this study, 465 experimentally known materials were classified and fully anharmonic ab initio Green-Kubo calculations were performed for 58 of them. The results revealed 28 thermal insulators, including 6 with ultralow thermal conductivity of only 1 W/mK. The underlying mechanism driving strong anharmonic dynamics was found to be the exploration of metastable intrinsic defect geometries.
PHYSICAL REVIEW LETTERS
(2023)
Article
Optics
Yun Wang, Jiquan Huang, Yuqing Lin, Zhonghua Deng, Qiufeng Huang, Zhuguang Liu, Jian Chen, Wang Guo
Summary: In this study, cyan-emitting Lu(3)ScAl(4-x)GaxO(12):Ce3+ persistent luminescent ceramics that can be excited by visible-light were fabricated and their photoluminescence and afterglow properties were investigated. The substitution of Ga for Al has three effects on the optical properties of the garnet phosphors: making the emission spectrum blue-shift, deteriorating the luminescence performance, and inducing afterglow. The Lu(2.99)Ce(0.01)ScAl(4-x)GaxO(12) ceramics with Ga content (x) around 2.5 can be efficiently excited by sunlight or indoor/outdoor w-LEDs and produce bright and long-lasting afterglow that matches human scotopic vision well.
JOURNAL OF LUMINESCENCE
(2023)
Article
Chemistry, Physical
Dequan Jiang, Zimin Jiang, Huimin Song, Pei Wang, Hui Luo, Chen Li, Ke Liu, Ting Wen, Wenge Yang, Yusheng Zhao, Yonggang Wang
Summary: This study reports a pressure-induced SHG on-off phenomenon, accompanied by structural phase transition and piezochromism, in CdTeMoO6. The suppression of stereoactive lone-pair electrons on Te4+ is believed to be responsible for the SHG-off state under high pressure, and piezochromism from colorless to black is observed. The three-in-one transition (structural transition, SHG on-off, and piezochromism) is irreversible at room temperature but reversible upon annealing at higher temperatures, making CdTeMoO6 a practical multifunctional pressure- and temperature-regulated SHG switching material.
CHEMISTRY OF MATERIALS
(2021)
Article
Thermodynamics
S. Paoloni, U. Zammit, N. Orazi, F. Mercuri, L. Mattiello, D. Rocco, C. Glorieux, J. Thoen
Summary: The study focused on phase transitions of photochromic p, p'-n-alkylazobenzenes compounds using adiabatic scanning calorimetry and photopyroelectric calorimetry techniques. It accurately determined the temperature dependence of enthalpy, specific heat capacity, and enthalpy of transition values across observed phase transitions. Additionally, microscopy imaging and PPE calorimetric evaluations were conducted to examine the nature of the phases, and the influence of photoinduced trans to cis isomerization on phase transitions was assessed by PPE calorimetric evaluations during UV irradiation.
THERMOCHIMICA ACTA
(2021)
Article
Chemistry, Multidisciplinary
Praveen Kumar Singh, Himanshu Verma, Prashant Dubey, Roman Dabrowski, Ravindra Dhar
Summary: Graphene oxide dispersed nanocomposites show increased transition temperatures, enthalpies, and order parameters. Graphene oxide has an increased optical band gap, while reduced graphene oxide has a decreased optical band gap. The dielectric anisotropy is increased for graphene oxide dispersed nanocomposites, while the opposite property is observed for reduced graphene oxide dispersed system. The relaxation frequency has increased for graphene oxide dispersed system, while remaining unchanged for reduced graphene oxide dispersed system. Conductivity has increased by three orders of magnitude for reduced graphene oxide dispersed nanocomposites, but has decreased for graphene oxide dispersed system. Both GO/rGO dispersed systems show a decrease in threshold voltage, elastic constant, and rotational viscosity. The graphene oxide dispersed nanocomposite seems to be more effective due to its enhanced molecular polarizability.
Article
Physics, Multidisciplinary
I. G. Kuleyev, I. I. Kuleyev
Summary: The study demonstrates that at low temperatures, the drag thermopower in monocrystalline potassium nanoplates with rectangular-shaped cross-section is dependent on the orientation of their wide faces, with different results for different face orientations. When the transverse parameters of the nanoplates increase, the anisotropy of the drag thermopower varies non-monotonically.
CHINESE JOURNAL OF PHYSICS
(2021)
Article
Chemistry, Multidisciplinary
Praveen Kumar Singh, Prashant Dubey, Ravindra Dhar, Roman Dabrowski
Summary: In this study, a small concentration of reduced graphene oxide was dispersed in the liquid crystalline media. The thermodynamic study showed a reduction in the transition temperature, enthalpy, and entropy of the dispersed nanocomposite. Optical study revealed a decrease in the optical bandgap of the dispersed nanocomposite compared to the pure sample. Dielectric spectroscopic measurement showed a decrease in dielectric anisotropy and an increase in ionic conductivity for the dispersed nanocomposite. The activation energy for DC conductivity was reduced in the dispersed nanocomposite, leading to an increase in conductivity. The cut-off region of DC conductivity also increased in the dispersed nanocomposite. Electro-optical studies indicated a reduction in the threshold voltage, splay elastic constant, and rotational viscosity for the dispersed nanocomposite.
Article
Nanoscience & Nanotechnology
V. S. Zakhvalinskii, T. B. Nikulicheva, A. V. Kochura, E. Lahderanta, M. Shakhov, A. S. Kubankin, M. Sukhov, M. N. Yaprintsev, A. A. Morocho
Summary: In this study, the conductivity and magnetoresistance of the alpha' phase solid solution of (Cd1-xZnx)(3)As-2 were investigated. Single crystals were obtained and their space group, tetragonal lattice parameters were determined. The results showed the presence of one type of charge carrier at higher temperatures, while at lower temperatures, two types of holes with different mobilities were observed.
Article
Materials Science, Multidisciplinary
Matthias Daeumer, Ernesto D. Sandoval, Arad Azizi, Morteza H. Bagheri, In-Tae Bae, Sitaram Panta, Ekaterina A. Koulakova, Eric Cotts, Charles L. Arvin, Aleksey N. Kolmogorov, Scott N. Schiffres
Summary: In this study, the relationship between thermal conductivity anisotropy and superstructure in Cu3Sn material was investigated through experimental and theoretical calculations. The experimental results showed that the thermal conductivity varies with different crystal orientations, while the theoretical calculations indicated that the known Cu3Sn superstructures are metastable. The study found that the anisotropy of thermal conductivity is about 15%, which is lower than previous experimental results.
Article
Chemistry, Physical
Hengning Chen, Zeyu Deng, Yuheng Li, Pieremanuele Canepa
Summary: Niobate and tantalate coating materials can mitigate the interfacial reactivities in Li-ion and all-solid-state batteries by forming stable native defects and enhancing Li-ion transport. The multiphasic nature of Li-Nb-O and Li-Ta-O coatings, containing mixtures of LiNbO3 and Li3NbO4 or of LiTaO3 and Li3TaO4, was revealed through first-principles calculations.
CHEMISTRY OF MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
V. Ya Degoda, G. P. Podust, I. Yu Doroshenko, N. Yu Pavlova
Summary: In this study, a multicenter model of a crystal was proposed to investigate the theoretical dependence of phosphorescence intensity attenuation and conduction current relaxation. The results showed that the filling level of traps depends on both the radiation dose and the excitation intensity. The study also explained the experimental phenomenon of the intersection of phosphorescence and conduction current relaxation curves at different excitation intensities.
Review
Physics, Applied
Riley Hanus, Ramya Gurunathan, Lucas Lindsay, Matthias T. Agne, Jingjing Shi, Samuel Graham, G. Jeffrey Snyder
Summary: Recent advancements in thermal sciences have led to a reexamination of the fundamentals of vibrational heat conduction, with a focus on updating and refining the physical understanding with new theoretical and experimental techniques. The increasing maturity of simulation and modeling methods has sparked a desire to rapidly improve technology through digital engineering and multi-scale, electro-thermal models. This review aims to build a holistic understanding of thermal transport by exploring the often overlooked relationships between subfields critical for multi-scale modeling approaches.
APPLIED PHYSICS REVIEWS
(2021)
Article
Optics
Gennady A. Komandin, Sergey P. Lebedev, Stella L. Korableva, Oleg A. Morozov, Vladimir M. Kyashkin, Vadim V. Semashko, Pavel P. Fedorov
Summary: The basic mechanisms of absorption of THz range radiation in optically perfect LiGdF4 single crystals were studied using experimental data and dielectric response function analysis within the harmonic oscillator model. Polarized IR reflection spectra were used to determine phonon contribution, while transmission spectra provided information on birefringence and the effects of various multiparticle processes. Additionally, the optical and electrodynamic parameters of the LiGdF4 single crystal were established for the design of nonlinear optical devices.
Article
Biochemistry & Molecular Biology
Arina D. D. Filippova, Madina M. M. Sozarukova, Alexander E. E. Baranchikov, Sergey Yu. Kottsov, Kirill A. A. Cherednichenko, Vladimir K. K. Ivanov
Summary: The enzyme-like activity of metal oxide nanoparticles is influenced by factors such as size, shape, surface chemistry, and substrate affinity. The size effect of ceria nanoparticles, a prominent inorganic nanozyme, is still not well understood. This study investigated the peroxidase-like activity of CeO2 nanoparticles with different sizes in different buffer solutions, and found that the size of the nanoparticles had different effects on their activity depending on the buffer solution used. The possible reasons for these differences are discussed.
Article
Physics, Multidisciplinary
L. Pagnanini, G. Benato, P. Carniti, E. Celi, D. Chiesa, J. Corbett, I. Dafinei, S. Di Domizio, P. Di Stefano, S. Ghislandi, C. Gotti, D. L. Helis, R. Knobel, J. Kostensalo, J. Kotila, S. Nagorny, G. Pessina, S. Pirro, S. Pozzi, A. Puiu, S. Quitadamo, M. Sisti, J. Suhonen, S. Kuznetsov, ACCESS Collaboration
Summary: The ACCESS project aims to establish a novel technique for precision measurements of forbidden beta-decays. It will operate a pilot array of cryogenic calorimeters to simultaneously measure natural and synthetic isotopes with a common experimental technique. The project also includes optimized crystals to reduce systematic uncertainty.
EUROPEAN PHYSICAL JOURNAL PLUS
(2023)
Article
Nanoscience & Nanotechnology
Taisiya O. Kozlova, Anton L. Popov, Mikhail V. Romanov, Irina V. Savintseva, Darya N. Vasilyeva, Alexander E. Baranchikov, Vladimir K. Ivanov
Summary: Nanocrystalline cerium dioxide is a promising inorganic UV filter for sunscreen applications due to its high UV absorbance and non-toxicity to normal cells. Nanoscale CeO2 also showed selective cytotoxicity to cancer cells. Crystalline cerium(IV) phosphates can be a promising alternative for nanoscale CeO2 due to their low solubility, high redox stability and UV protective property. In this work, it was demonstrated for the first time that ceric phosphates have a comparable inhibitory impact on murine melanoma B16/F10 cell line to nanoscale CeO2 at high concentrations.
NANOSYSTEMS-PHYSICS CHEMISTRY MATHEMATICS
(2023)
Article
Nanoscience & Nanotechnology
Alexander A. Alexandrov, Anna D. Rezaeva, Vasilii A. Konyushkin, Andrey N. Nakladov, Sergey V. Kuznetsov, Pavel P. Fedorov
Summary: A series of Ca1-xYxF2+x single crystals with a fluorite structure and YF3 concentrations ranging from 1-19 mol.% (x = 0.01-0.19) were grown using a molten method. The temperature dependence of heat capacity Cp(T) was measured using a thermal analyzer from room temperature to 1300 degrees C. An anomaly in the Cp(T) curves, with a maximum at 1150 +/- 50 degrees C, was observed for concentrations x = 0.01-0.03, indicating a diffuse phase transition in the solid state. As the YF3 content increased (x = 0.05-0.19), a wide structured peak in the range of 650-1100 degrees C was recorded. The heat capacity anomaly was attributed to the reversible rearrangement of defect nanoclusters, which affected the change in the anion sublattice.
NANOSYSTEMS-PHYSICS CHEMISTRY MATHEMATICS
(2023)
Article
Chemistry, Inorganic & Nuclear
E. G. Il'in, A. S. Parshakov, L. D. Iskhakova, S. Yu. Kottsov, A. D. Filippova, L. V. Goeva, N. P. Simonenko, A. E. Baranchikov, V. K. Ivanov
Summary: The behavior of cerium tetrafluoride hydrate was studied under different temperatures. A new cerium fluoride compound was formed during the hydrothermal treatment at 100 degrees Celsius, while hydrolysis and reduction of cerium(IV) fluoride compounds occurred at temperatures above 130 degrees Celsius.
RUSSIAN JOURNAL OF INORGANIC CHEMISTRY
(2023)
Article
Chemistry, Inorganic & Nuclear
M. M. Sozarukova, E. V. Proskurnina, I. V. Mikheev, L. A. Polevoy, A. E. Baranchikov, V. K. Ivanov
Summary: Cerium oxide sols functionalized with gallic acid were synthesized, and it was found that these composites possess antioxidant and pro-oxidant properties. The immobilization of gallic acid on the surface of cerium dioxide nanoparticles leads to a decrease in its antioxidant and pro-oxidant activities, especially in the 2:1 ratio.
RUSSIAN JOURNAL OF INORGANIC CHEMISTRY
(2023)
Article
Chemistry, Multidisciplinary
Alexander A. Alexandrov, Lada A. Petrova, Daria V. Pominova, Igor D. Romanishkin, Maria V. Tsygankova, Sergey V. Kuznetsov, Vladimir K. Ivanov, Pavel P. Fedorov
Summary: A novel tetragonal matrix has been synthesized by molten salt synthesis, and it can be used as a dual-range optical temperature sensor operating in both visible and shortwave infrared ranges.
APPLIED SCIENCES-BASEL
(2023)
Article
Cell Biology
Nikita N. Chukavin, Vladimir K. Ivanov, Anton L. Popov
Summary: This study investigated a new type of cerium oxide nanoparticles that can monitor intracellular reactive oxygen species (ROS) activity by releasing fluorescent dye calcein. The results show that these nanoparticles have selective cytotoxicity against cancer cells and can modulate the expression of key genes related to cell redox status and proliferation/migration activity.
Article
Biochemistry & Molecular Biology
Artem M. Ermakov, Vera A. Afanasyeva, Alexander V. Lazukin, Yuri M. Shlyapnikov, Elizaveta S. Zhdanova, Anastasia A. Kolotova, Artem S. Blagodatski, Olga N. Ermakova, Nikita N. Chukavin, Vladimir K. Ivanov, Anton L. Popov
Summary: This study investigates the combined use of cold argon plasma (CAP) and metal oxide nanoparticles for antibacterial treatment. The results demonstrate that the combination of CAP and redox-active metal oxide or metal fluoride nanoparticles effectively inhibits bacterial growth, damages DNA, and disrupts the cell wall. The combination of CAP and CeF3 nanoparticles shows the strongest antimicrobial effect on plasmid DNA, while the CAP and WO3 combination is most effective against bacterial genomic DNA. CeF3 nanoparticles exhibit strong antimicrobial and DNA-damaging properties for the first time.
Article
Optics
Sergey V. Kuznetsov, Darya S. Yasyrkina, Damir T. Valiev, Sergey A. Stepanov, Alexander A. Alexandrov, Sergey Kh. Batygov, Valeriy V. Voronov, Vasilii A. Konyushkin, Andrey N. Nakladov, Julia A. Ermakova, Pavel P. Fedorov
Summary: Single-phase Ba1-xCexF2+x solid solution samples were synthesized by directional crystallization and co-precipitation methods. The cathodoluminescence spectra of these samples exhibited a wide band feature, indicating the presence of two typical components of Ce3+.
Article
Physics, Condensed Matter
Matin Ashurov, Stella Kutrovskaya, Alexander Baranchikov, Sergey Klimonsky, Alexey Kavokin
Summary: The method developed utilizes the optical properties of ETPTA IPhCs to determine alcohol concentrations in water, with the position of the PSB as the analytical signal. Sensitivity was found to be sufficient for various applications in bio/chemical detection and environmental monitoring, especially for ethylene glycol-water mixtures.
Article
Materials Science, Biomaterials
Madina M. Sozarukova, Ekaterina M. Kochneva, Elena V. Proskurnina, Ivan V. Mikheev, Dmitry O. Novikov, Mikhail A. Proskurnin, Vladimir K. Ivanov
Summary: This study investigates the interaction between nanoscale CeO2 and human serum albumin (HSA), finding that the presence of nanoparticles can alter the structure of albumin without affecting its function.
ACS BIOMATERIALS SCIENCE & ENGINEERING
(2023)
