Materials Literature
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The dielectric anisotropy of liquid crystals causes director reorientation in an applied electric field and is thus at the heart of electro-optic applications of these materials. The components of the dielectric tensor are frequency dependent. Until recently, this frequency dependence was not accounted for in a descri…
Small angle neutron scattering and electron microscopy are used to investigate the ordering of soft latex particles which have been dispersed in water and then brought into contact through evaporation of the solvent. We observe a succession of metastable states where the particles are kept separated by their hydrophil…
This chapter provides a comprehensive overview of the maximum-entropy method (MEM) as it is applied to X-ray powder-diffraction data for computation of an unbiased electron-density map. The MEM requires a strictly positive electron-density map that is described by its values on a fine grid over the unit cell (with gri…
The existence of ponderomotive acceleration effects in the metal bulk has been experimentally demonstrated in the context of the femtosecond plasmon-assisted multiphoton photoelectric effect in metal systems. The resulting electron energy spectra show that these effects essentially depend on the coupling between the s…
Two approaches are available for the analysis of the size and size distribution of the domains in a crystalline powder: pattern decomposition (or fitting) and pattern modelling. In the first case, the information is obtained from some fitting parameter and no direct connection exists between the model and the data; in…
Results describing the interaction of a single sulfur atom with cationic gold clusters (Au(n) (+), n=1-8) using density functional theory are described. Stability of these clusters is studied through their binding energies, second order differences in the total energies, fragmentation behavior, and atom attachment ene…
In this paper, we study the structural properties of selected representatives of the so-called molybdenum cluster compounds. Belonging to this family are the $\mathrm{Ga}{M}_{4}{X}_{8}$ compounds with $M=\mathrm{Mo}$ as a group VIB element and V, Nb, or Ta as a group VB element. $X$ denotes either S or Se. These compo…
Polycrystalline Cr-doped TiO 2 films were fabricated by co-sputtering Cr and TiO 2 targets in a pure Ar and O 2 mixture with various oxygen partial pressures. Ferromagnetism is observed in all samples and the Curie temperatures are well above 390 K. The saturation magnetization of films shows strong dependence on the…
Viscosity is one of the fundamental physical properties of liquids; for different melts it varies in an extremely wide range. Selenium is among the first elementary substances to have manifested, at compression, a phase transformation in the liquid state accompanied by melt metallization. Direct measurements by means…
High Resolution Image Download MS PowerPoint Slide The radius of gyration ( R g ) was determined as a function of generation number for arborescent polystyrenes with two different side chain mass average molecular mass ( M w ≈ 5000, 5K, versus 30 000, 30K) by small-angle neutron scattering (SANS) measurements. The R g…
The durability and failure cause of a polymer Schottky diode made with PEDOT : PSS-pentacene were investigated. A polymer Schottky diode was fabricated by dissolving pentacene in N-methylpyrrolidone (NMP) and mixing with PEDOT : PSS. Pentacene solution having a maximum concentration of approximately 9.7 mmoles was pre…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTOxidation−Migration Cycle in Polypropylene-Based NanocompositesMenachem Lewin and Yong TangView Author Information Polymer Research Institute, Department of Chemical and Biological Sciences, Polytechnic University, 6 Metrotech Cente…
As a practical concept of regenerative medicine, we have focused on in vivo tissue engineering utilizing the foreign body reaction. Plastic substrates for valvular leaflet organization, consisting of two pieces assembled with a small aperture were inserted into a microporous polyurethane conduit scaffold. The assembly…
The authors report two methods to determine electromagnetic and chemical enhancement factors in surface-enhanced Raman scattering (SERS), which are based on saturation property and decay dynamics of photoluminescence and concurrent measurements of photoluminescence and resonance Raman scattering intensities. Considera…
We report the displacive and order–disorder characters of PbTiO 3 analyzed using a classical atomic model which was developed under the inverse relation between the bond length and the bond valence. The ferroelectric phase changes to the paraelectric phase around 700 K, and the histograms of Ti–O and Pb–O bond lengths…
Octahedral-like NiFe2O4 ferrite nanocrystals were synthesized using EDTA-assisted hydrothermal method under mild conditions. XRD and FTIR analysis were used for composition and structure investigation. XRD analysis revealed a pure ferrite phase with high crystallinity. Morphological investigation by SEM showed octahed…
Bis(5-methyl-2-[(2-nitrophenyl)amino]-3-thiophenecarbonitrilyl)acetylene, a derivative of the highly polymorphic compound 5-methyl-2-[(2-nitrophenyl)amino]-3-thiophenecarbonitrile (ROY) that possesses two chromophores electronically coupled through a triple bond, was found to be trimorphic. Structural data for two of…
Excited-state properties of the croconate dyes were investigated with an aim to utilize them as light harvesting assemblies in the infrared (IR) region (λ max ∼ 865 nm and M −1 c −1 = (1.4−4.2) × 10 5 M −1 s −1 ). The excited singlet of the monomeric dye quickly deactivates (lifetime 4−7 ps) without undergoing intersy…
A one-step template-free process for the fabrication of pure, doped, and codoped single-crystal MgBO 2 (OH) nanobelts in high yield has been presented. The growth mechanism of such novel nanobelts has been investigated on the basis of time-dependent experiments and the crystal structure of szaibelyite MgBO 2 (OH). Upo…
This paper describes a study of the generation and flow of photocurrent through junctions containing three-dimensional arrays of colloidal CdSe quantum dots (QDs) of either a single size or multiple sizes. The electrodes were indium tin oxide (ITO) covered with a thin layer of poly(3,4-ethylenedioxy-thiophene):poly(st…