Materials Literature
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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…
A conductive carbon nanofiber (CNF) paper is described for the actuation of shape recovery of a shape-memory polymer (SMP) by electrically resistive Joule heating. The CNF paper was manufactured using a traditional physical vapor deposition process and the microscale morphology and structure of the CNF paper were obse…
Surface-enhanced Raman scattering (SERS) spectra of pyridine in various Ag colloids with different excitation wavelengths (514.5 and 1064 nm) were recorded and compared with the theoretical models computed with application of the static density functional theory method in order to simulate the chemical enhancement. Py…
The metal polysulfide complexes [M( N -MeIm) 6 ]S 8 ( M = Fe, Ni) and ZnS 6 ( N -MeIm) 2 ( N -MeIm = N -methylimidazole) were synthesized and used as single-source precursors for the synthesis of metal sulfide nanocrystals. Rapid injection of [Ni( N -MeIm) 6 ]S 8 into oleylamine at 300 °C, followed by immediate coolin…
A short synthesis route to silica-encapsulated nanoparticles coated with a self-assembled monolayer (SAM) is presented. The organic molecules within the SAM contain a SiO2 precursor to render the surface vitreophilic. Due to the high mechanical and chemical stability of a glass shell, such particles can be used as pro…
The crystalline phase of random poly(hexamethylene sebacate- co -hexamethylene adipate) (P(HSe- co -HA)) was studied by differential scanning calorimetry (DSC), Fourier transform infrared (FTIR) spectroscopy, wide-angle X-ray diffraction (WAXD), and small-angle X-ray scattering (SAXS). From the quantitative analysis o…
Ultrasonic spray pyrolysis has been used as a facile aerosol route to macroporous SiO(2) particles using simple inorganic salts as a pore template and colloidal SiO(2) as building blocks to the larger porous particles. As we found, the use of template salts with low melting points was vital to macroporous particle syn…
Type-II band-offset CdSe/CdTe nanorod heterostructures with curved and linear shapes have been synthesized and examined with atomic-resolution transmission electron microscopy techniques. Strain from growth of larger-lattice CdTe partly on the sides of CdSe nanorod seeds is shown to lead to an overall curvature in the…
We present here a new example of aggregation-induced emission enhancement (AIEE), which involves an original mechanism based on the formation of organic ion pairs. The phenol 4-hydroxy-7-nitrobenzoxadiazole (NBDOH) is dissociated in water at pH 5.0 to give the corresponding phenolate, which is poorly fluorescent in th…