Materials Literature
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In this work, catalysts of 2 wt % Ni supported on samaria-doped ceria (SDC), gadolinia-doped ceria, and α-Al 2 O 3, as well as SDC-supported Ni−Cu catalysts with 0.5 wt % Ni or Cu and addition of 0.01−0.1 wt % Cu or Ni were prepared. Activity tests for steam reforming of methane over these catalysts were carried out a…
Strontium hydroxyapatite (SrHAp) nanowires with an aspect ratio of several hundreds were synthesized by controlling the growth conditions during a hydrothermal process. In the strontium phosphate system, it was found that the phase evolution changed with pH and that the aspect ratio of SrHAp was affected by the phases…
The optical emission from electronically excited C species in the ablation plume following the short (ns) and ultrashort (fs) UV pulsed laser ablation of graphite is studied. Wavelength, time and spatially resolved imaging of the plume, in background pressures of inert gases such as argon and helium, is performed. Ana…
A new approach is suggested to explain the Peltier effect. It assumes that the Peltier effect is not an isothermal effect. The approach is based on the occurrences of induced thermal fluxes in a structure which consists of two conducting media, through which a dc electric current flows. These induced thermal diffusion…
Mesoporous silicas (SBA-15 and MCM-41) have been functionalized by two different methods. Using the heterogeneous route the silylating agent, 3-chloropropyltriethoxysilane, was initially immobilized onto the mesoporous silica surface to give the chlorinated mesoporous silica Cl-SBA-15 or Cl-MCM-41. In a second reactio…
Free-standing polypyrrole (PPy) film actuators, prepared electrochemically from aromatic ester solutions of lithium bis(perfluoroalkylsulfonyl)imide (Li(C n F 2 n +1 SO 2 ) 2 N) ( n = 1–4) or tetra- n -butylammonium bis(perfluoroalkylsulfonyl)imide (TBA(C n F 2 n +1 SO 2 ) 2 N) ( n = 1–2), exhibited extremely large el…
High-resolution core-level and valence-band x-ray photoelectron spectra (XPS) of the nonconductor silicates, quartz, and two olivines (${[\mathrm{Mg},\mathrm{Fe}]}_{2}\mathrm{Si}{\mathrm{O}}_{4}$, Mg rich and Fe rich) have been obtained with the Kratos magnetic confinement charge compensation system which minimizes di…
In this study, we report the chemical and mineralogical characteristics of 4 benchmark Ultisols of Kerala to elucidate their genesis and taxonomy. The taxonomic rationale of the mineralogy class of Ultisols and other highly weathered soils on the basis of the contemporary pedogenesis is also explained. The Ultisols of…
Purposely designed ionic liquids can be excellent solvents for spectroscopic studies of rare earth compounds. Absorption and emission spectra of anhydrous PrI 3 and Pr(Tf 2 N) 3 in the ionic liquid 1,1- n -butyl-methylpyrrolidinium bis(trifluoromethanesulfonyl)amide, [bmpyr][Tf 2 N], at room temperature are presented…
To have a clear physical insight into the nanocrystal formation upon pulsed-laser ablation in liquid, we proposed a theoretical kinetic approach to elucidate the nucleation and growth of nanocrystals with respect to the capillary effect of the nanometer-sized curvature of crystalline nuclei. Taking the nanodiamond syn…
Abstract The thermal conductivity of boron nitride (BN)‐filled poly(butylene terephthalate) (PBT) was investigated as a function of particle size, aspect ratio, surface area, surface chemistry, and concentration of BN as well as composite processing methods and conditions. In the low filler concentration region, a lar…
Dielectric relaxation spectroscopy of pressure amorphized hexagonal ice shows that water's high-density amorphous form relaxes in approximately 1 s at 140 K and 1 GPa and that the relaxation is virtually unaffected by pressure. This indicates that the amorph is an ultraviscous liquid above 140 K, the same as would be…
Abstract The NIR‐FT Raman, FT‐IR spectral and SERS analysis of potential NLO material, p ‐hydroxy acetophenone is carried out by density functional computations. The SHG efficiency is tested using a Q‐switched Nd:YAG laser of wavelength λ at 1064 nm, which is approximately 1.2 times that of urea. Optimized geometry re…
A detailed analysis of the photoluminescence (PL) from Si nanocrystals (NCs) embedded in a silicon-rich ${\mathrm{SiO}}_{2}$ matrix is reported. The PL spectra consist of three Gaussian bands (peaks $A,B$, and $C$), originated from the quantum confinement effect of Si NCs, the interface state effect between a Si NC an…
We demonstrate organic nonvolatile memories based on transistors, made from spin-coated polymers, that have programming voltages of 15V and good data retention capabilities. The low-voltage programmable ferroelectric field-effect transistors were obtained by an optimized ferroelectric polymer deposition method using c…
Gold nanoparticles of 20-100 nm diameter were synthesized within HEK-293 (human embryonic kidney), HeLa (human cervical cancer), SiHa (human cervical cancer), and SKNSH (human neuroblastoma) cells. Incubation of 1 mM tetrachloroaurate solution, prepared in phosphate buffered saline (PBS), pH 7.4, with human cells grow…
A combined experimental and theoretical investigation of the nature of the active form of gold in oxide-supported gold catalysts for the water gas shift reaction has been performed. In situ extended X-ray absorption fine structure (EXAFS) and X-ray absorption near-edge structure (XANES) experiments have shown that in…
Based on the Ehrenfest theorem, an equation of motion that takes relaxation into account has been presented in wave-function theory, and the resulting response functions are nondivergent in the off-resonant as well as the resonant regions of optical frequencies. The derivation includes single- and multideterminant ref…
The overlap of the principal luminescence band of the erbium ion with the low-loss optical transmission window of silica optical fibres, along with the drive for integration of photonics and silicon technology, has generated intense interest in doping silicon with erbium to produce a silicon-based optical source. Sili…
A new methodology for the preparation of well-defined core-shell nanoparticles was developed, based upon the employment of a multifunctional crosslinker to coincidently stabilize supramolecular polymer assemblies and imbed into the shell unique chemical functionalities. Amphiphilic diblock copolymers of poly(acrylic a…