Materials Literature
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The linear attenuation coefficients in aqueous solutions of three carbohydrates, glucose (C6H12O6), maltose monohydrate (C12H22O11·H2O), and sucrose (C12H22O11), were determined at 81, 356, 511, 662, 1173, and 1332 keV by the gamma-ray transmission method in a good geometry setup. From the precisely measured densities…
Coprecipitation is the method most frequently applied to prepare Layered Double Hydroxides (LDHs). Two variations of this method can be used, depending on the pH control conditions during the precipitation step. In one case the pH values are allowed to vary while in the other they are kept constant throughout coprecip…
Corrosion management principles, along with conventional technical solutions to corrosion problems in industry, can be utilized to mitigate corrosion and its resulting problems.
Six new heteropoly compounds in the [M4(H2O)2(As2W15O56)2]16- series (M = CuII, MnII, CoII, NiII, ZnII, CdII), previously unknown, were synthesized and characterized by means of IR, UV-vis, CV, 183W NMR, TG-DSC, and elemental analyses. The synthetic method used in preparing this type of heteropoly compounds was differ…
We have explored spin, charge, and orbitally ordered states in ${\mathrm{La}}_{1\ensuremath{-}x}{\mathrm{Sr}}_{x}{\mathrm{MnO}}_{3}$ $(0<x<1/2)$ using model Hartree-Fock calculations on $d\ensuremath{-}p$-type lattice models. At $x=1/8,$ several charge and orbitally modulated states are found to be stable and al…
The aim of this study is to understand deeper the thermal diffusion transport process (Ludwig–Soret effect) at the microscopic level. For that purpose, the recently developed reverse nonequilibrium molecular dynamics method was used to calculate Soret coefficients of various systems in a systematic fashion. We studied…
We discovered an unprecedented magnitude of the $1/f$ noise near the Curie temperature ${(T}_{c})$ in low-${T}_{c}$ manganites. The scaling behavior of the $1/f$ noise and resistance provides strong evidence of the percolation nature of the ferromagnetic transition in the polycrystalline samples. The steplike changes…
The electronic structure of spinel-type ${\mathrm{Cu}}_{1\ensuremath{-}x}{\mathrm{Ni}}_{x}{\mathrm{Rh}}_{2}{\mathrm{S}}_{4}$ $(x=0.0,$ 0.1, 0.3, 0.5, 1.0) and ${\mathrm{CuRh}}_{2}{\mathrm{Se}}_{4}$ compounds has been studied by means of x-ray photoelectron (XPS) and fluorescent spectroscopy. Cu ${L}_{3},$ Ni ${L}_{3},…
We present a novel hybrid computational method to simulate accurately dendritic solidification in the low undercooling limit where the dendrite tip radius is one or more orders of magnitude smaller than the characteristic spatial scale of variation of the surrounding thermal or solutal diffusion field. The first key f…
We report on experiments to measure the temporal and spatial evolution of packing arrangements of anisotropic, cylindrical granular material, using high-resolution capacitive monitoring. In these experiments, the particle configurations start from an initially disordered, low-packing-fraction state and under vertical…
Increasing the conversion efficiency is very important in photovoltaic devices, as is cheap and simple technology. Here is demonstrated a soft embossing technique for printing a submicrometer grating with an elastomeric mold into an optically active polymer layer in a photovoltaic device (see Figure). The light trappi…
We have used a dynamic density functional theory (DDFT) for polymeric systems, to simulate the formation of micro phases in a melt of an asymmetric block copolymer, AnBm(fA=1/3), both in the bulk and in a thin film. In the DDFT model a polymer is represented as a chain of springs and beads. A spring mimics the stretch…
A new computer program for on-line crystallographic analysis in transmission electron microscopy (TEM) is presented. The program is based on the fast on-line determination of single-crystal orientations from Kikuchi and spot patterns. Spot patterns, which are particularly useful in the case of highly deformed metals,…
Abstract An environmental infrared microbalance (EIRM) cell was used to study H 2 O sorption on two montmorillonite samples as a function of water content and type of exchangeable cation. The vibrational spectra showed that H 2 O sorbed to the clay at low-water content was strongly influenced by the exchangeable catio…
A quick (less than 1 min) soak of protein crystals in a cryo-solution containing bromide or iodide anions leads to incorporation of these anomalous scatterers into the ordered solvent region around the protein molecules. These halide anions provide a convenient way of phasing through their anomalous scattering signal:…
Structural analysis and thermal conductivity data on ${\mathrm{Sr}}_{8}{\mathrm{Ga}}_{16}{\mathrm{Ge}}_{30}$ and ${\mathrm{Eu}}_{8}{\mathrm{Ga}}_{16}{\mathrm{Ge}}_{30}$ crystals are reported. These compounds form in the cubic space group $\mathrm{Pm}3\ifmmode\bar\else\textasciimacron\fi{}n$ with lattice parameters of…
A versatile modular system for complex branched polymer architectures has been developed through exploitation of the multibranching polymerization chemistry of glycidol. This report summarizes recent advances in the preparation of these novel polymers and describes the modular concept used to tailor their topology to…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTDendrimer-Encapsulated Pd Nanoparticles as Fluorous Phase-Soluble CatalystsVictor Chechik and Richard M. CrooksView Author Information Department of Chemistry, Texas A&M University P.O. Box 30012, College Station, Texas 77842-3012 Cite this: J. Am. Chem. Soc. 2000, 122…
Nanoporous silica films are of interest to the semiconductor industryas low dielectric constant intermetal materials. Here the controlled synthesis of highly porous silica films with dielectric constants between ≈1.8 and ≈2.5 is described using a polyethylene ether surfactant to template the porosity and a spin-on sol…
Giant enhancement of the dielectric properties has been measured at the percolation threshold of a metal–insulator functional, graded composite using an in–situ electrical probe. The system reported (Mullite–Mo) combines very good thermal stability, low leakage currents, and very high capacitance, using dielectric mat…