Article
Chemistry, Physical
D. Roy, S. Chakraborty, A. K. Gupta, A. BasuMallick, R. O. Scattergood, Carl C. Koch
Summary: In this study, bulk nanocrystalline Cu-Zr-Nb alloys were synthesized and annealed to investigate the reasons for maintaining nanosized grains. The results showed that the grain size remained in the nanoscale range due to solute atoms segregation along grain boundaries and Zenner pinning by intermetallic precipitates.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Chemistry, Physical
J. S. Zuback, A. D. Iams, F. Zhang, L. A. Giannuzzi, T. A. Palmer
Summary: The addition of nitrogen in high temperature alloys leads to the formation of different nitride phases, which can enhance the high temperature and creep properties of the materials. However, there is a scarcity of data for nickel superalloys, making it difficult to accurately predict the formation of various phases.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Materials Science, Multidisciplinary
G. Hannah Priya, A. Alinda Shaly, G. Evangelin, J. Mary Linet
Summary: TiO2, CuS, and TiO2/CuS nanocomposites were synthesized via one-step hydrothermal method for photocatalytic degradation of harmful crystal violet dye. The TiO2/CuS nanocomposites exhibited improved catalytic properties.
JOURNAL OF MATERIALS RESEARCH
(2022)
Article
Thermodynamics
Wladyslaw Janusz, Ewa Skwarek, Dariusz Sternik, Stanislaw Pikus
Summary: Yttrium citrate was synthesized in aqueous environment through hydrothermal treatment. The product is crystalline yttrium citrate dihydrate, which undergoes thermal decomposition in synthetic air, releasing water and carbon dioxide.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2021)
Article
Chemistry, Physical
Claudio Ferdeghini, Andrea Mezzetta, Felicia D'Andrea, Christian Silvio Pomelli, Lorenzo Guazzelli, Luca Guglielmero
Summary: This study provides a preliminary comparative evaluation of the effect of linker chain length and the size of aliphatic ammonium rings on the thermal and solubility properties of bromide dicationic ionic liquids.
Article
Materials Science, Composites
Raghav Poudel, Niranjan Karak
Summary: In this study, a green composite of yam and alkali-treated corn stalk fiber was prepared, which exhibited good mechanical and thermal properties and excellent biodegradability under normal environmental conditions. The potential applications of this composite material include packaging, biomedical, automobile, and construction sectors.
COMPOSITES SCIENCE AND TECHNOLOGY
(2023)
Article
Chemistry, Multidisciplinary
Tianxiang Ning, Yinyi Luo, Piao Liu, Anxian Lu
Summary: In this study, a novel method called membrane separation-centrifugation technology was used to purify AgNPs. The results showed that the cleaned AgNPs obtained through this method had minimal organic residues, were pure single-crystal cubic phase Ag, and had nanoscale size and excellent stability. Furthermore, the AgNPs ink made from these purified AgNPs exhibited low electrical resistivity. These findings highlight the significance of this study in the field of printed electronics.
JOURNAL OF NANOPARTICLE RESEARCH
(2022)
Article
Nanoscience & Nanotechnology
P. D. Solanki, Mahatta H. Oza, H. O. Jethwa, Jaydeep Joshi, Girish Joshi, R. Jayavel, M. J. Joshi
Summary: In this study, nickel pyrophosphate nanoparticles were synthesized using a surfactant-mediated approach, and their structural, optical, electrical, and electrochemical properties were studied. The synthesized nanoparticles exhibited a nanostructured monoclinic structure with small crystallite size and internal strain. The nanoparticles showed good absorption performance in the visible range and had high dielectric constant and alternating current conductivity. These findings are significant for the applications in energy storage devices and supercapacitors.
Article
Physics, Condensed Matter
Parul Sharma, Pragati Singh, Kamni
Summary: This study systematically investigated Mn2+ doped KSrVO4 nanophosphors synthesized by low-cost combustion method, revealing their structural and spectral properties through various characterization techniques. The doping of Mn2+ was found to affect the band gap and PL spectra, indicating the potential application of these nanophosphors excited by InGaN LEDs emitting UVA light.
PHYSICA B-CONDENSED MATTER
(2021)
Article
Chemistry, Physical
Kamila Hyra, Pawel M. Nuckowski, Joanna Willner, Tomasz Suponik, Dawid Franke, Miroslawa Pawlyta, Krzysztof Matus, Waldemar Kwasny
Summary: The article assesses the solutions and dried residues from the bioleaching process of PCB using Acidithiobacillus ferrooxidans. The analysis of the residues showed a difference in the component oxidation, with the leachate consisting mainly of amorphous particles and the control solution showing crystalline components. The investigation confirmed the activity of A. ferrooxidans bacteria in solubilizing electronic waste components.
Article
Chemistry, Multidisciplinary
Aleksandr Levin, Ekaterina Khrapova, Daniil Kozlov, Andrei Krasilin, Victor Gusarov
Summary: The morphology and structure of (NixMg1-x)(3)Si2O5(OH)(4) synthetic phyllosilicate nanoscrolls were investigated, revealing the mechanism and direction of scrolling, and concluding that scrolling is an effective means of stress relaxation.
JOURNAL OF APPLIED CRYSTALLOGRAPHY
(2022)
Article
Polymer Science
Rafael J. Zaldivar, Geena L. Ferrelli, Vanessa Arredondo, Hyun Kim
Summary: The effect of cure conditions on the performance of phenolic resin composite liners in solid rocket motor nozzles was investigated. Lower cure state led to poor mechanical properties and fiber/matrix coupling, which were further exacerbated by reduced consolidation. Thermal exposure caused larger tensile strains and increased crack density, porosity, and delamination in the lower temperature cured composites. The 94 degrees C cured sample exhibited higher moisture absorption and more severe thermal mechanical response compared to the other conditions.
JOURNAL OF APPLIED POLYMER SCIENCE
(2022)
Article
Materials Science, Multidisciplinary
Kazuho Okada, Akinobu Shibata, Wu Gong, Nobuhiro Tsuji
Summary: This study characterized the deformation microstructure of hydrogen-charged ferritic-pearlitic steel and discussed the microscopic mechanism of hydrogen-related quasi-cleavage fracture. It was found that hydrogen affected the dislocation behavior, leading to a tangled dislocation morphology and increased dislocation density.
Article
Materials Science, Multidisciplinary
Kanagarajan Kiruthika, Velayutham Renuga, Vembu Suryanarayanan
Summary: In this study, sodium manganese oxide (NMO), an alkali metal cation doped transition metal oxide, was synthesized using a simple solid state calcination method. The NMO's structure, functional group, morphology, and elemental composition were characterized using various techniques. Electrochemical performance analysis showed that NMO had a specific capacitance of 151 F/g at a current density of 1 A/g. To improve the specific capacitance, carbon nanotubes (CNT) were added to NMO, and the electrochemical studies of NMO/SWCNT and NMO/MWCNT were compared. The results demonstrated that NMO/MWCNT exhibited a high specific capacitance of 415 F/g, along with good rate performance, excellent electrochemical stability, and high coulombic efficiency.
JOURNAL OF MATERIALS RESEARCH
(2023)
Article
Nanoscience & Nanotechnology
Dmitri Louzguine-Luzgin, Jing Jiang
Summary: Low temperature relaxation and structural changes in a Cu36Zr48Al8Ag8 bulk glassy alloy were investigated using differential scanning calorimetry, X-ray diffractometry, scanning and transmission electron microscopy. The results showed that the densification of the sample occurred due to the beginning of structural relaxation, resulting in an increase in room-temperature mechanical strength and plasticity values.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Chemistry, Physical
Takaya Tezuka, Norio Mori, Takuya Murayama, Takuma Sano, Tomohiro Nakagawa, Hirotaka Inoue, Yasuhiko Hayashi, Toru Kuzumaki
Summary: The high-strengthening mechanism of carbon nanotube (CNT) yarns subjected to Joule heating is attributed to structural changes such as improved crystallinity, formation of individual CNT bundles with polygonal structure, and entwining of these bundles. The presence of numerous voids in the outer portion of lower-strength CNT yarns strongly affects the tensile strength of the fibers.
Article
Materials Science, Multidisciplinary
May Thu Zar Myint, Takeshi Nishikawa, Hirotaka Inoue, Kazuki Omoto, Aung Ko Ko Kyaw, Yasuhiko Hayashi
Summary: The room-temperature thermoelectric performance of carbon nanotube yarn is improved through controlled doping with poly 3-hexylthiophene to enhance the power factor, offering potential for low-grade waste heat power generation.
ORGANIC ELECTRONICS
(2021)
Review
Physics, Multidisciplinary
Shinya Koshihara, Tadahiko Ishikawa, Yoichi Okimoto, Ken Onda, Ryo Fukaya, Masaki Hada, Yasuhiko Hayashi, Sumio Ishihara, Tadeusz Luty
Summary: This work reviews experimental studies on photo-induced cooperative phenomena related to ultrafast structural and electronic-state dynamics. The growth of PIPT research is facilitated by collaboration between quantum beam science and materials science, and the concept has expanded with developments in ultrafast quantum beam technology.
PHYSICS REPORTS-REVIEW SECTION OF PHYSICS LETTERS
(2022)
Article
Instruments & Instrumentation
Kou Takubo, Samiran Banu, Sichen Jin, Misaki Kaneko, Wataru Yajima, Makoto Kuwahara, Yasuhiko Hayashi, Tadahiko Ishikawa, Yoichi Okimoto, Masaki Hada, Shinya Koshihara
Summary: To investigate photoinduced phenomena, ultrashort pulsed x-ray and electron sources are necessary. Research has developed a tabletop setup for ultrashort pulsed electron diffraction that can observe photoinduced structural dynamics on a femtosecond timescale. The setup has a pulse duration comparable to femtosecond laser pulse widths and could be a powerful tool in material science.
REVIEW OF SCIENTIFIC INSTRUMENTS
(2022)
Article
Materials Science, Multidisciplinary
Shigeyuki Umezawa, Takashi Douura, Koji Yoshikawa, Daisuke Tanaka, Vlad Stolojan, S. Ravi P. Silva, Mika Yoneda, Kazuma Gotoh, Yasuhiko Hayashi
Summary: Heat treatment of metal-organic frameworks (MOFs) can produce functional carbons suitable for supercapacitor electrodes. This study investigated the carbonization process of two zinc-based MOFs and found that pore generation is crucial for achieving high capacitance. The findings provide valuable insights for the development of other metal-based MOF-derived multifunctional carbons.
ENERGY & ENVIRONMENTAL MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Hiroo Suzuki, Ryoki Hashimoto, Masaaki Misawa, Yijun Liu, Misaki Kishibuchi, Kentaro Ishimura, Kenji Tsuruta, Yasumitsu Miyata, Yasuhiko Hayashi
Summary: Transition metal dichalcogenides (TMDCs), including MoS2 and WS2, with their atomically thin structure and strong optoelectrical responses, show great potential as next-generation semiconducting materials for flexible optoelectronic applications. This study focuses on growing monolayer WS2 using chemical vapor deposition (CVD) technique and obtained high-quality WS2 with a narrow photoluminescence (PL) peak width. By controlling the source balance of W and S, large-sized fully monolayered WS2 and monolayer WS2 with bilayer spots were achieved. Furthermore, WS2/MoS2 lateral heterostructures were successfully created and demonstrated good electrical transport properties.
Article
Chemistry, Multidisciplinary
Venkata Krishna Rao Rama, Ajinkya K. Ranade, Pradeep Desai, Bhagyashri Todankar, Golap Kalita, Hiroo Suzuki, Masaki Tanemura, Yasuhiko Hayashi
Summary: We investigated the device properties of a nickel-gallium oxide Schottky junction with an interfacial hexagonal boron nitride layer. The addition of the hBN layer significantly enhanced the turn-on voltage for forward current and improved the photoresponsivity under deep ultraviolet light illumination. The hBN interfacial layer can serve as a barrier layer to control the turn-on voltage and optimize the device properties for deep-UV photosensor applications.
Article
Chemistry, Physical
Napat Kaewtrakulchai, Araya Smuthkochorn, Kanit Manatura, Gasidit Panomsuwan, Masayoshi Fuji, Apiluck Eiad-Ua
Summary: The hydrotreating process of plant-based oils to liquid transportation fuels is a promising pathway for biofuel production. This study successfully produced bio-jet fuel from palm olein oil using metal phosphide supported on porous biochar catalysts, with iron phosphide catalyst showing the highest performance and selectivity. The results suggest the potential of using palm oil fiber-derived porous biochar as a catalyst supporter for biofuel production.
Review
Chemistry, Physical
Saeid Akrami, Tatsumi Ishihara, Masayoshi Fuji, Kaveh Edalati
Summary: Excessive CO2 emission from fossil fuel usage has led to global warming and environmental crises. The photocatalytic conversion of CO2 to CO or useful components is a new strategy to address this issue. The main challenge is finding photocatalysts with high efficiency for CO2 photoreduction. Severe plastic deformation (SPD) has been used to develop active catalysts for CO2 conversion. These strategies can enhance photocatalytic efficiency by improving CO2 adsorption, increasing light absorbance, aligning the band structure, and providing active sites for photocatalytic reactions. This article reviews recent progress in using SPD to develop functional ceramics for photocatalytic CO2 conversion.
Article
Chemistry, Multidisciplinary
Hiroo Suzuki, Misaki Kishibuchi, Masaaki Misawa, Kazuma Shimogami, Soya Ochiai, Takahiro Kokura, Yijun Liu, Ryoki Hashimoto, Zheng Liu, Kenji Tsuruta, Yasumitsu Miyata, Yasuhiko Hayashi
Summary: Transition metal dichalcogenides (TMDCs) are promising 2D materials for optoelectronic devices and physics advancements. This study successfully synthesized long WxOy nanowires and grew monolayer WS2 nanoribbons on their surface. The developed method demonstrated high monolayer selectivity and enabled the growth of long WS2 nanoribbons with desired electronic properties. These findings have potential applications in future optoelectronic devices and advanced physics research.
Article
Engineering, Electrical & Electronic
Saman Azhari, Kouki Kimizuka, Gabor Mehes, Yuki Usami, Yasuhiko Hayashi, Hirofumi Tanaka, Takeo Miyake
Summary: Integrating sensory devices with wireless power transfer technology allows for remote sensing with complex electronic circuitry and communication protocols. Researchers have successfully integrated piezo-responsive porous multiwalled carbon nanotubes/polydimethylsiloxane nanocomposites with a near-field wireless power transfer system to remotely monitor mechanical force. The wireless system transfers power bidirectionally and detects impedance changes in the receiver circuit to wirelessly monitor finger bending and applied force. This approach offers a new path for disposable haptic-based sensory applications in various fields.
IEEE SENSORS JOURNAL
(2023)
Article
Physics, Applied
Chinkhai Ong, Wengnam Lee, Linghong Lim, Wuyi Chong, Jingwen Chew, Yasuhiko Hayashi, Takeshi Nishikawa, Patrik Ohberg, Harith Ahmad, Yuenkiat Yap
Summary: This study investigated the dispersion stability of tin(IV) oxide nanoparticles in N-Methy-2-Pyrrolidone (NMP), dimethylformamide (DMF), and distilled water assisted by ultrasonication, aiming to find a suitable liquid medium for effective dispersion of tin(IV) oxide for various applications. The stability of the dispersions was characterized using field emission scanning electron microscopy, ultraviolet-visible spectroscopy, and Zeta potential. The results showed that distilled water had the highest stability with an optimum sonication time of 1 hour. NMP exhibited better stability and consistency compared to DMF at different sonication timings. The good agreement between ultraviolet-visible absorbance and Zeta potentials indicated that both distilled water and NMP were good media for producing highly stable tin(V) oxide dispersion.
JAPANESE JOURNAL OF APPLIED PHYSICS
(2023)
Article
Materials Science, Multidisciplinary
Amr Elattar, Libor Kobera, Jiban Kangsabanik, Hiroo Suzuki, Sabina Abbrent, Takeshi Nishikawa, Kristian S. Thygesen, Jiri Brus, Yasuhiko Hayashi
Summary: This research discovers that the addition of CuBr2 enhances the light absorption of Cs3Bi2Br9 perovskite crystals and investigates the formation mechanism of perovskite crystals through various analyses. By adding up to 50% CuBr2, the matrix structure of Cs3Bi2Br9 perovskite remains intact with homogeneously distributed Cs2CuBr4 domains. The research also reveals that alloying can decrease the bandgap by forming compensating defect levels.
JOURNAL OF MATERIALS CHEMISTRY C
(2022)
Article
Chemistry, Multidisciplinary
Amr Elattar, Jiban Kangsabanik, Kodai Nakao, Kosei Tsutsumi, Hiroo Suzuki, Takeshi Nishikawa, Kristian S. Thygesen, Yasuhiko Hayashi
Summary: Lead-based halide perovskites can have their optoelectronic properties enhanced through B-site engineering. This study investigated the B-site alloying of MAPbBr(3) thin films with copper (Cu2+), resulting in dark-colored films with increased grain boundary and reduced optical bandgap. The presence of a Cu-rich secondary phase was observed in the alloyed perovskite thin films. The conductivity of the films increased significantly upon alloying. Temperature-dependent conductivity measurements revealed the occurrence of two phase-transitions in Cu-substituted perovskite, compared to only one transition in pristine MAPbBr(3). Photocurrent measurements showed carrier generation in the near-infrared region. The study proposes the importance of alloying in modulating the phase and tailoring the optoelectronic properties of perovskites for efficient optoelectronic devices.
MATERIALS CHEMISTRY FRONTIERS
(2022)
Article
Engineering, Electrical & Electronic
Hiroo Suzuki, Misaki Kishibuchi, Kazuma Shimogami, Mitsuaki Maetani, Kyohei Nasu, Tomohiro Nakagawa, Yuichiro Tanaka, Hirotaka Inoue, Yasuhiko Hayashi
Summary: The study focuses on the fabrication of one-dimensional van der Waals heterogeneous structures on carbon nanotubes by directly growing two-dimensional materials such as hexagonal boron nitride. The research successfully achieved the bulk-scale integration of the hBN/CNT heterostructures and discovered memristive behavior in the assemblies. The imperfect crystallinity of hBN on CNTs may enhance the memristive behavior, making the heterostructure assemblies valuable for neuromorphic computing and nonvolatile memory devices.
ACS APPLIED ELECTRONIC MATERIALS
(2021)
