Article
Dentistry, Oral Surgery & Medicine
Andres Stricker, Thomas Bergfeldt, Tobias Fretwurst, Owen Addison, Rainer Schmelzeisen, Rene Rothweiler, Katja Nelson, Christian Gross
Summary: The study found exogenous metal contaminants and other impurities in commercial titanium dental implants, which may provoke immunological reactions despite conforming to standard compositions. Further investigation into the clinical relevance of these findings and discussion on the adjustment of industry standards are warranted.
Article
Nanoscience & Nanotechnology
Ehsan Ghasali, Davoud Ghahremani, Yasin Orooji
Summary: Ti laminated composites were successfully prepared by using metallic additive powders between Ti sheets and spark plasma sintering process. Different metallic additives such as Mo, Cr, Si, and Co were inserted between Ti layers to form unique composite structures, resulting in varied mechanical properties. The highest Vickers hardness and bending strength were observed in Ti-Si and Ti-Cr laminated composites, respectively, indicating the potential for tailored performance through appropriate additive selection.
JOURNAL OF SCIENCE-ADVANCED MATERIALS AND DEVICES
(2021)
Article
Chemistry, Physical
Mehdi Khosravi, Hadi Feizi, Behzad Haghighi, Suleyman Allakhverdiev, Mohammad Mahdi Najafpour
Summary: Photocatalysts are important for green fuel production. The study compared the photo-electrochemical performance and behavior of mixed-phase titanium oxide and iron oxide heterojunction with titanium oxide nanotubes and iron oxide heterojunction. Results showed that factors such as stabilization potential and dissolved oxygen did not significantly affect the photo-electrochemical properties of the electrodes.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Chemistry, Physical
Cheng Peng, Quanyu Liu, Peng Lv, Zhichen Liu, Dongfang Huang, Quanbao Zhou, Ruixue Zhao
Summary: This study investigates the effects of Fe substitution by Zr on the microstructure, hydrogen storage properties, and oxidation resistance of TiFe0.85-xCr0.15Zrx (x = 0, 0.05, 0.10, 0.15) alloys. The results show that the introduction of Zr does not change the main phase of TiFe, but it affects the hydrogen storage capacity and oxidation resistance. With increasing Zr content, the first hydrogenation capacity increases while the reversible hydrogen storage capacity decreases. The alloys with higher Zr content exhibit good oxidation resistance and form more stable hydrides during the first hydrogenation.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Chemistry, Multidisciplinary
Jorge M. S. Faria, Dora Martins Teixeira, Ana Paula Pinto, Isabel Brito, Pedro Barrulas, Mario Carvalho
Summary: Increasing manganese levels in acidic soils can affect the concentration and subcellular distribution of aluminum, manganese, iron, and silicon in wheat roots and shoots, leading to symptoms of metal toxicity. Comprehensive chemical analysis of soil solution and plant tissues contributes to a more accurate understanding of the uptake dynamics and agronomic implications of metal elements.
APPLIED SCIENCES-BASEL
(2021)
Article
Engineering, Chemical
Theresa Coetsee, Frederik De Bruin
Summary: Al-Cr-Ti-Cu unconstrained metal powders are used to assist the alloying of carbon steel in Submerged Arc Welding (SAW). The addition of Al-Cu-Ti and Al-Cu-Ti-Cr metal powders increases the metal deposition rates by 19% and 40% respectively, compared to the base case without metal powder additions. Using Al powder as a deoxidiser allows for control of oxygen partial pressure and ensures the transfer of Ti and Cr metal powder into the weld pool while keeping the oxygen content in acceptable limits. The likely sequence of alloy melt formation is deduced from the alloy phase diagrams and the effect of Fe addition is illustrated in thermochemical calculations.
Article
Chemistry, Multidisciplinary
Mahmoud R. M. Atalla, Simone Assali, Anis Attiaoui, Cedric Lemieux-Leduc, Aashish Kumar, Salim Abdi, Oussama Moutanabbir
Summary: Semiconductor membranes have been utilized as a platform to manipulate lattice strain and bandgap energy in GeSn semiconductor alloys, leading to the fabrication of broadband photodetectors with a record wavelength cutoff of 4.6 μm integrated on silicon. Experimental tools and optimized calculations were employed to study the crystalline quality, composition uniformity, lattice strain, and electronic band structure of the investigated materials and devices, showing significant improvement in performance compared to strained epitaxial layers. This research paves the way for scalable and flexible sensing and imaging technologies by engineering transferable mid-infrared photodetectors based on silicon-compatible strained-relaxed GeSn membranes.
ADVANCED FUNCTIONAL MATERIALS
(2021)
Article
Chemistry, Inorganic & Nuclear
Sylvio Indris, Thomas Bredow, Bjoern Schwarz, Andreas Eichhoefer
Summary: This study determined the Li-7 NMR shifts and magnetic properties of three ate complexes, showing distinct differences compared to related ion-separated complexes. The ate complexes with Li connected to 3d metal atoms displayed strong NMR paramagnetic shifts, while the trends were confirmed by density-functional theory calculations. The magnetic properties of the compounds varied, with different behaviors observed for manganese, iron, and cobalt complexes.
INORGANIC CHEMISTRY
(2022)
Article
Biochemistry & Molecular Biology
Kamil Jurowski, Maria Folta, Barbara Tatar, Miroslaw Krosniak
Summary: This study aimed to determine total Cr impurities in traditional herbal medicinal products and confirmed that all products meet the standards of ICH Q3D elemental impurities guideline through comprehensive toxicological risk assessment.
BIOLOGICAL TRACE ELEMENT RESEARCH
(2022)
Article
Engineering, Electrical & Electronic
Noori S. Anad, Zakaria M. Abd El-Fattah, M. Attallah, Hanaa M. Ahmed, M. M. El-Okr, H. H. El-Bahnasawy
Summary: Pristine and chromium-doped ZnO nanowires were synthesized using the co-precipitation method, and their properties were characterized using various techniques. The study showed that chromium doping had minimal effect on the optical band gap, and the successful doping was confirmed through spectroscopic analysis.
OPTICAL AND QUANTUM ELECTRONICS
(2022)
Article
Physics, Multidisciplinary
X-Y Lin, H-C Chang, B-L Huang, Y-J Lin
Summary: Experimental results show that indium metal exhibits ohmic behavior when it is deposited on n-Si samples that have been treated with (NH4)2S-x, while it exhibits Schottky behavior on untreated n-Si samples. This transition is attributed to the removal of the native oxide and the formation of Si-S-x^2- bonds on the Si surface, which cause a change in the surface band bending for n-Si.
INDIAN JOURNAL OF PHYSICS
(2022)
Article
Materials Science, Multidisciplinary
Larry Zazzera, Qilin Chan, Jaimie Stomberg, Alexander Simpson, Chris Loesch, Duy LeHuu, David Muradian, Uma Rames Krishna Lagudu, Brian Mader
Summary: This study utilized spICP-MS to measure ceria particle number concentrations and compare changes in size distributions to silicon dioxide wafer removal rates during different CMP processes. The research found that changes in ceria particle size distribution were correlated with removal rates.
ECS JOURNAL OF SOLID STATE SCIENCE AND TECHNOLOGY
(2021)
Review
Engineering, Electrical & Electronic
Lisheng Wang, Wenbo Wang, Raymond J. E. Hueting, Gert Rietveld, Jan Abraham Ferreira
Summary: This article provides a comprehensive review of topside interconnection technologies for wide bandgap (WBG) semiconductor power devices and modules. It discusses the challenges, driving factors, and various interconnection materials, and presents potential future directions for development.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2023)
Article
Soil Science
A. L. do Nascimento Junior, L. da S. Souza, A. de Q. Paiva, L. D. Souza, L. F. Souza-Filho, E. Fernandes Filho, C. E. G. R. Schaefer, J. A. G. Santos, M. R. Bomfim, E. F. da Silva, A. C. O. Fernandes, F. A. da S. Xavier
Summary: The study investigated the spatial dependence of trace elements in soil profiles in a semi-arid region of Brazil and compared their concentrations with reference values set by environmental agencies. The concentration of trace elements showed low dispersion in the area, with Pb and As concentrations above prevention values but with low dispersion, while Zn concentration was above prevention value and had higher dispersion requiring major concern. Cr, Cu, Ni, Fe, Mn, and Ti concentrations were below reference values with low dispersion.
Article
Engineering, Manufacturing
H. B. Lim, Katherine McLachlin, Ciaran O'Connor, Daniel Wiederin, Hyuck Ki Hong
Summary: This study utilized LA-ICP-MS to investigate the imaging of metal ions and nanoparticles on a structured silicon surface. Results showed that multi-elemental contaminants can be successfully imaged.
IEEE TRANSACTIONS ON SEMICONDUCTOR MANUFACTURING
(2021)
Article
Physics, Applied
Hiromasa Ohmi, Takeshi Funaki, Hiroaki Kakiuchi, Kiyoshi Yasutake
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2016)
Article
Physics, Applied
Hiromasa Ohmi, Jumpei Sato, Tatsuya Hirano, Yusuke Kubota, Hiroaki Kakiuchi, Kiyoshi Yasutake
APPLIED PHYSICS LETTERS
(2016)
Article
Chemistry, Physical
Hiromasa Ohmi, Hiroaki Kakiuchi, Kiyoshi Yasutake
JOURNAL OF ALLOYS AND COMPOUNDS
(2017)
Article
Physics, Applied
Mitsutoshi Shuto, Hiromasa Ohmi, Hiroaki Kakiuchi, Takahiro Yamada, Kiyoshi Yasutake
JOURNAL OF APPLIED PHYSICS
(2017)
Article
Physics, Applied
Norihisa Takei, Fumiya Shinoda, Hiroaki Kakiuchi, Kiyoshi Yasutake, Hiromasa Ohmi
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2018)
Article
Physics, Applied
Hiroaki Kakiuchi, Hiromasa Ohmi, Kiyoshi Yasutake
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2018)
Article
Engineering, Multidisciplinary
Hiroaki Kakiuchi, Hiromasa Ohmi, Kiyoshi Yasutake
PRECISION ENGINEERING-JOURNAL OF THE INTERNATIONAL SOCIETIES FOR PRECISION ENGINEERING AND NANOTECHNOLOGY
(2019)
Article
Physics, Applied
Keiichi Hamanaka, Norihisa Takei, Hiroaki Kakiuchi, Kiyoshi Yasutake, Hiromasa Ohmi
PLASMA PROCESSES AND POLYMERS
(2020)
Article
Physics, Applied
Hiroaki Kakiuchi, Hiromasa Ohmi, Kiyoshi Yasutake
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2020)
Article
Physics, Applied
Kiyoshi Yasutake, Kazushi Yoshida, Hiromasa Ohmi, Hiroaki Kakiuchi
Summary: A recently reported procedure for estimating plasma parameters in atmospheric-pressure Ar plasma has been extended to Ar-N-2 plasma. Through computer simulations and experiments, it was found that increasing N-2 concentration leads to a drastic decrease in electron density while electron temperature slightly increases. These results provide guidelines for selecting effective plasma nitridation conditions.
JOURNAL OF APPLIED PHYSICS
(2021)
Article
Physics, Applied
Hiroaki Kakiuchi, Hiromasa Ohmi, Kiyoshi Yasutake
Summary: The numerical simulation of atmospheric-pressure plasma-enhanced chemical vapor deposition of silicon films showed that dissociation of source SiH4 molecules by electron impact is the key factor governing the film growth on the substrate. This suggests rapid nucleation of clusters and growth into nanoparticles in the plasma.
JOURNAL OF APPLIED PHYSICS
(2021)
Article
Physics, Applied
Kazushi Yoshida, Hiromasa Ohmi, Kiyoshi Yasutake, Hiroaki Kakiuchia
Summary: Indium nitride nanostructures were successfully formed by plasma nitridation of molten indium at both atmospheric and sub-atmospheric pressure. Various nanostructures, including nanoparticles, nanowires, and microtubes, with different diameters were observed under scanning electron microscope. High quality wurtzite-type single crystal indium nitride could be grown at a relatively low temperature of 673 K as confirmed by transmission electron microscopy and Raman spectroscopy.
JOURNAL OF APPLIED PHYSICS
(2021)
Article
Engineering, Electrical & Electronic
Hiromasa Ohmi, Kenta Kimoto, Toshimitsu Nomura, Hiroaki Kakiuchi, Kiyoshi Yasutake
Summary: This research investigated the Si removal property achieved by a localized microwave hydrogen plasma, revealing the relationship between plasma generation parameters and removal property. Stress relief and removal of the affected Si layer were demonstrated, as well as the lack of etching-rate dependence on crystal plane orientation. The study also discussed the critical etching rate that determines the surface roughness of the etched Si sample.
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
(2021)
Article
Nanoscience & Nanotechnology
Kouji Inagaki, Yoshitada Morikawa, Hiromasa Ohmi, Kiyoshi Yasutake, Hiroaki Kakiuchi
Summary: The diffusion properties of an excess hydrogen atom on a fully hydrogenated Si surface were analyzed using density functional theory calculations, revealing small activation energies for diffusion pathways. The weak adsorption energy of the excess H atom was found to be responsible for the small activation energy of diffusion.
Article
Chemistry, Multidisciplinary
Hiromasa Ohmi, Jumpei Sato, Yoshiki Shirasu, Tatsuya Hirano, Hiroaki Kakiuchi, Kiyoshi Yasutake
