Materials Literature
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A new and simple method for preparation of hollow calcium carbonate nanospheres under mild conditions is developed. Hollow vaterite nanospheres are achieved by water-induced phase transformation of poly(4-sodium styrene sulfonate)-stabilized amorphous calcium carbonate (PSS−ACC) in water−ethanol solution at room tempe…
It was found that luminol could react with AgNO 3 in the presence of gold colloid to generate chemiluminescence (CL) at 425 nm. UV−visible spectra and X-ray photoelectron spectra showed that AgNO 3 was reduced by luminol to Ag in the CL reaction, which covered on the surface of gold nanoparticles to form Au/Ag core/sh…
The morphology of Mg/Al layered double hydroxides (LDHs) has been manipulated by hydrothermal treatment following the nucleation by coprecipitation or urea hydrolysis method in sodium dodecanesulfonate (SAS) aqueous solution. It is observed that the dodecanesulfonate (AS) serves as both of the interlayer anion and the…
Photo-darkening and photo-bleaching are well known phenomena in As-Se and Ge-Se chalcogenide glasses, respectively. Consequently, a systematic dependence of photo-induced optical changes in Ge(x)As(45-x)Se(55) glass series on x is expected between these two extremes. This prediction of photosensitivity on Ge/As ratio…
B 8 amide is a large molecule based on a derivative of the BODIPY laser dye PM567. Both molecules exhibit highly stable radical ions and similar absorbance and photoluminescence spectra. For B 8 amide, the redox potentials are E ° = −1.40 and 0.96 V vs SCE for reduction and oxidation, respectively, and for PM567, they…
The roles of the different sites and structures of supported V 5+ /CeO 2 catalysts have been studied by the operando Raman-GC methodology during ethane oxidative dehydrogenation (ODH) to obtain a molecular understanding of the structure−activity/selectivity relationships in this system. A remarkable deactivation takes…
Drying of salt solutions leads to the accumulation of salt at any surface where evaporation occurs. When this drying occurs within porous media, the precipitation of salts or efflorescence is generally to be avoided. A one-dimensional model for the drying processes in initially saturated porous materials was presented…
In the present paper we study the enthalpy relaxation behavior of the hyperquenched GeO(2) (HQGeO(2)) glass, one of the strongest glass systems. By applying the hyperquenching-annealing-calorimetry approach, we have found that unlike fragile glasses the strong HQGeO(2) glass relaxes in a manner that all the secondary…
The coercivity of surface grains of a Nd–Fe–B sintered magnet can be measured unequivocally if the magnet is a thin slab with the orientation of its c-axis parallel to the largest surface. Due to the loss of part of the neodymium-rich grain boundary phase, the surface Nd2Fe14B grains have low coercivity after machinin…
We study the wavelength and polarization dependent plasmon resonances of single silver and gold nanorods, triangles, cubes, and dimers with a novel single particle spectroscopy method (RotPOL). In RotPOL, a rotating wedge-shaped polarizer encodes the full polarization information of each particle within one image. Thi…
Development of nontoxic, clean techniques for the synthesis of metal nanoparticles such as gold has attracted increasing attention in recent years. Although many reports have been published about the biogenesis of gold nanoparticles using several plant extracts such as Neem leaf broth (Azadirachta indica), the capacit…
Role of Ge Switch in Phase Transition: Approach using Atomically Controlled GeTe/Sb2Te3 Superlattice, Tominaga, Juniji, Fons, Paul, Kolobov, Alexander, Shima, Takayuki, Chong, Tow Chong, Zhao, Rong, Lee, Hock Koon, Shi, Luping
Magnetic field-induced twin boundary motion leading to large magnetic field-induced strain of ∼1.0% was established in polycrystalline Ni 50.9 Mn 27.1 Ga 22.0 (at.%) fibres at room temperature (∼60–100 μm in diameter and ∼3 mm in length). The fibres' grains are as large as the fibre diameter and of random orientation.…
Several shielding applications, to protect human health and electronic devices against dangerous effects of electromagnetic radiation, require solutions that fabrics can suitably fulfill. Here, we will discuss the electromagnetic interference shielding effectiveness of polypyrrole-coated polyester nonwoven textiles, i…
The size of the gold particles is a very important parameter to get active catalysts. This paper reports a novel colloidal deposition method to prepare Au/LaVO 4 nanocomposite catalyst with monodispersed Au colloids and uniform LaVO 4 nanoplates in nonpolar solvent. Monodispersed Au colloids with tunable size (such as…
Capacitive properties of vanadium oxides on carbon nanotubes (CNTs) have been investigated. In structural properties, the Raman spectrum shows the characteristic peaks of V 2 O 5, and XPS analysis predicts that the atomic ratio of as-prepared vanadium oxide is approximately the same as that of the stoichiometric V 2 O…
Abstract Nanocrystalline diamond thin films are grown on silicon and glass substrates by microwave plasma (MP)CVD from a gas mixture of methane and hydrogen at low substrate temperatures. The initial stages of diamond growth, i.e., i) the growth of individual nanometer‐sized crystals and clusters, and ii) coalescence…
This paper studies the vibrational characteristics of single-walled carbon nanotubes (SWNTs) with initial axial loading based on the theory of nonlocal elasticity. The consistent equations of motion for the nonlocal Euler-Bernoulli and Timoshenko beam models are provided taking into account the initial axial stress. T…
The emission of wide band photoluminescence showed a synergic effect on barium zirconate and barium titanate thin films in alternate multilayer system at room temperature by 488 nm exiting wavelength. The thin films obtained by spin-coating were annealed at 350, 450, and 550 degrees C for 2 h. The X-ray patterns revea…
It has been shown previously that the thermoelectric properties of the Zintl phase compound, YbZn2Sb2 can be finely tuned via substitution at the cationic Yb-site. Here we report the results of the investigation of isoelectronic substitution of Zn by Mn in the anionic (Zn2Sb2)2− framework. The p-type YbZn2−xMnxSb2 (0.…