Materials Literature
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We employ density-functional-theory calculations to examine carbon adsorption and diffusion in Pd bulk, and on Pd(111) and Pd(211) surfaces. Different possible subsurface and on-surface structures are explored and the most stable structures are analyzed. We calculate various diffusion paths: lateral diffusion on a sur…
Silver nanoparticle containing silica coatings on soda-lime glass were prepared by the sol-gel process. The effect of thermal densification treatment at different temperatures in the range of 100-700 degrees C on microstructure and antibacterial properties of the coatings were examined. The structural characterization…
During the last decade, tissue engineering has shown a considerable promise in providing more viable alternatives to surgical procedures for harvested tissues, implants and prostheses. Due to the fast development on nano- and biomaterial technologies, it is now possible for doctors to use patients' cells to repair ort…
We propose a new method to extract the complete size-dependent complex dielectric function ε( E ) of semiconductor nanoparticles (NPs) from spectroscopic data. Typical experimental absorption spectra are available in a limited energy range near the absorption edge. We show that this limitation can be overcome by match…
This study characterizes and models the temperature and charge voltage dependency in the electrical characteristics of a packed electric double layer capacitor (EDLC). The characterized results indicate that the frequency response of the terminal impedance in a packed EDLC varies with the charge voltage and temperatur…
We have successfully employed an oleate-modified nucleation/hydrothermal growth process for the synthesis of YVO 4:Eu 3+ nanoparticles. Oleate-passivated YVO 4:Eu 3+ nanoparticles, formed by precipitation of Y/Eu-oleate complex by Na 3 VO 4 solution, were subjected to hydrothermal treatment at 200 °C for 6 h to initia…
Variable-temperature scanning tunneling microscopy (STM) is used to show that Au 1 + deposited onto a TiO 2 (110)-(1 × 1) surface under soft-landing conditions at 600 K results in a surface decorated with isolated gold atoms bound to oxygen vacancies. This result is in sharp contrast to the large, sintered islands whi…
Cobalt silicide nanoparticles in mesoporous silica SBA-15 were successfully prepared by metal-organic chemical vapor deposition of a single-source precursor and were characterized by nitrogen physorption, X-ray diffraction, temperature-programmed reduction, temperature-programmed desorption, and transmission electron…
Three series of Lu 2 O 3:Eu ceramic materials doped with different concentrations of Eu 3+ ions (0.05−5 atom %) were prepared by sintering at the temperature of 1700 °C of nanocrystalline powders. The heat-treatments were performed in oxidizing, slightly reducing, and strongly reducing atmosphere of air, vacuum, and a…
To examine the effect of pore shape on freezing and melting temperatures of water, we measured X-ray diffraction patterns from water confined in four kinds of ordered mesoporous silicas with thin carbon films on the pore wall and three kinds of the inverse carbon replicas during freezing and melting processes. The mel…
A fluorescent organogel is obtained from the reaction of Zn(OAc)(2) x 2 H(2)O, 1,4-bis(4-pyridyl)-2,3-diaza-1,3-butadiene (bpd), and tartaric acid (H(4)tar) in methanol. The gel is proposed to have formed by the cross-linking of linear 1D coordination polymers [Zn(bpd)](n) with tartarate coligand in a highly random fa…
Abstract The mixed ionic–electronic conductivity under dilute hydrogen, the stability and the catalytic activity under propane:air type mixtures of a series of LAMOX oxide‐ion conductors have been studied. The effect of exposure to dilute hydrogen on the conductivity of the β‐La 2 (Mo 2 – y W y )O 9 series at 600 °C d…
A systematic investigation of the correlation between bonding geometries and electronic structures of mercapto-acetic acid molecule on the ZnO(101̅0) nonpolar surface is reported. The geometric structure calculation results are consistent with the recent Fourier transform infrared attenuated total reflectance (FT-IR-A…
Photocurable and highly condensed fluorinated methacrylate oligosiloxane, with a low dielectric constant (kappa = 2.54), was prepared by a nonhydrolytic sol-gel condensation reaction. The oligosiloxane resin was then spin-coated, photocured, and thermally baked in order to fabricate a fluorinated methacrylate hybrid m…
A simple synthesis route based on the incipient wetness impregnation method originally designed for catalytic purposes has been developed to synthesize Au/SiO 2 samples containing increasing amounts of gold (0−50% by weight). In all cases, nanoparticles having about the same size distribution (with majority about 10 n…
Nobler denn je: Der erste komplett anorganische, diskrete, vielkernige Gold(III)-Oxo-Komplex, [AuIII4AsV4O20]8− (siehe Struktur; Au gelb, As blau, O rot), wurde durch Kondensation von [Au(OH)4]− in Gegenwart von AsO43−-Ionen unter milden Reaktionsbedingungen erhalten. Das resultierende Polyoxoaurat ist ein Tetramer mi…
In this study we use density functional theory (DFT) to investigate the properties and H adsorption characteristics of structural isomers of the magnesium-doped aluminum cluster, Al 12 Mg. Our results show that the exohedral structure ( exo -MgAl 12 ) is significantly lower in energy (1.59 eV) than the endohedral stru…
Korea is supposed to develop the ITER tritium storage and delivery system (SDS), which is one of the main components of the ITER tritium plant. For successful procurement, there are several ongoing R&D activities in the detailed design phase. Investigation of design parameters of the storage and delivery beds has been…
Superparamagnetic Ba‐hexaferrite, BaFe 12 O 19 , nanoparticles were prepared by reacting tetrahydroxoferrates (III), [Fe(OH) 4 ] − ( aq ), and barium ions, Ba 2+ ( aq ), in an autoclave in the presence of a high concentration of hydroxide ions OH − . The synthesis temperature was between 80° and 140°C. The size and th…
Si 2 N 2 O secondary phase‐free, fully dense nano‐Si 3 N 4 ceramics (≥97% of theoretical density) were developed by combining carbothermal reduction treatment and spark plasma sintering (SPS), and their tribological properties were investigated by subjecting to self‐mated sliding under unlubricated conditions. Commerc…