Materials Literature
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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…
x Ray crystallography is currently the most favoured technique for structure determination of proteins and biological macromolecules. Increasingly, those interested in all branches of the biological sciences require structural information to shed light on previously unanswered questions. Furthermore, the availability…
We have studied charge injection and charge transport in thin disordered films of CdSe nanocrystals between metal electrodes. Current–voltage characteristics of these devices are investigated as a function of electrode material, nanocrystal size, and temperature. We measure the photocurrent response of these structure…
A miscible homopolymer–copolymer pair viz., poly(ethyl methacrylate) (PEMA)–poly(styrene-co-butyl acrylate) (SBA) is reported. The miscibility has been studied using differential scanning calorimetry. While 1 : 1 (w/w) blends with SBA containing 23 and 34 wt % styrene (ST) become miscible only above 225 and 185 °C res…
MOTIVATION: Typesetting, shading and labeling of nucleotide and peptide alignments using standard word processing or graphics software is time consuming. Available automatic sequence shading programs usually do not allow manual application of additional shadings or labels. Hence, a flexible alignment shading package w…
The fabrication and properties of polymer network–stabilized liquid crystals, formed by polymerization of a small amount of a bifunctional photoreactive monomer dissolved in a liquid-crystalline phase, are reviewed. The polymer network morphology is strongly related to preparation conditions such as monomer content, p…
PURPOSE: To investigate the accumulation and cellular uptake of long-circulating dextran-coated iron oxide (LCDIO) particles in malignant neoplasms in vivo. MATERIALS AND METHODS: A gliosarcoma rodent model was established to determine the distribution of a model LCDIO preparation in tumors. LCDIO accumulation in tiss…
There has been tremendous progress in the area of organic electronic materials and devices recently. However, many challenges and problems remain to be addressed for practical applications of such materials and devices. This article seeks to summarize some of the important recent materials-related research on organic…
A photocrosslinkable chitosan to which both azide and lactose moieties were introduced (Az-CH-LA) was prepared as a biological adhesive for soft tissues and its effectiveness was compared with that of fibrin glue. Introduction of the lactose moieties resulted in a much more water-soluble chitosan at neutral pH. Applic…