Materials Literature
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Both spirooxazine and spiropyran dyes have been embedded into two different hybrid matrices, which were formed from hydrolysis and cocondensation between diethoxydimethylsilane and zirconium propoxide and between methyldiethoxysilane (DH) and triethoxysilane (TH) respectively. The nature and the kinetics of the photoc…
The physico-chemical properties of biodegradable polylactide-co-glycolide (PLGA) microspheres containing the peptide salmon calcitonin (sCT) were affected by the processing parameters. The microsphere size increased with an increase in the viscosity of the polymer solution. Concentration of methanol and peptide in the…
Carbon films have been produced on the surface of β-SiC particles by reaction with Ar–Cl 2 and Ar–Cl 2 –H 2 gas mixtures at atmospheric pressure and temperatures of 600–1000 °C. The structure and composition of the carbon films have been investigated using XRD, SEM, EDS, TEM, FTIR and Raman spectroscopy. BET and TG we…
Palladium grafted mesoporous MCM-41 materials, prepared by vapor grafting, show remarkable activity in Heck carbon–carbon coupling reactions.
The suitability fo columnar discotics for applications in light emitting diodes (LEDs) has been investigated following the demonstration of their unusually large charge carrier mobilities. Results of X‐ray diffraction, computer simulations, and electroluminescence measurements are presented and discussed for discotic…
Iron-containing molecules and ions with various types of bonding were calculated using DFT theory (B3LYP functional) and an energy-adjusted effective core potential for iron (ECP(S)). Examination of calculated geometries, bond dissociation energies, ionization energies, enthalpies of formation, and harmonic frequencie…
Crystals of Fe 3 R(BO 3 ) 4 (R = Y, La, Nd) have been grown. Their structure and properties show close relations. The structures of these materials have been established by single-crystal X-ray diffraction. They crystallize in the huntite, CaMg 3 (CO 3 ) 4, structure type, trigonal system, space group R 32 (No. 155),…
Experimental work on charge distributions and charge transport in polymer films is reviewed. For studying the charge distributions in the thickness dimension, thermal or acoustic techniques are used with resolutions down to /spl sim/1 /spl mu/m. The polymer samples usually are charged with corona, electron beam or the…
The electrochromic nickel hydroxide thin film was anodically deposited from an aqueous solution. The effect of solution temperature, postheat‐treatment temperature, and addition of cadmium on the electrochromic behavior (color/bleach durability cycle, response time, and coloration efficiency of the nickel hydroxide fi…
Nitroxide radicals play a central role in the recent development of organomagnetic materials or molecular-based magnetic materials. This feature article considers the recent progress in the development of molecular-based magnetic materials dealing mainly with nitroxide radical crystals and charge transfer (CT) complex…
We apply boundary integrals to the analysis of diffraction from both conductive and dielectric diffractive optical elements. Boundary integral analysis uses the integral form of the wave equation to describe the induced surface distributions over the boundary of a diffractive element. The surface distributions are use…
We describe and explore a new general transmission line model that describes the viscoelastic characteristics of thin films in terms of their shear moduli. The model contains within it the commonly used lumped-elementmodel as a limiting case, and we delineate the conditions under which thesimpler lumped-element model…
ABSTRACT Interest in biodegradable materials for packaging and agricultural uses has grown in recent years. Plant proteins have been proposed as inexpensive, renewable, and abundant feedstock. Corn zein was investigated based on value‐added considerations and on the unique thermoplastic and hydrophobic properties of z…
It has been shown that for dead marine diatom cells or diatom cells which are severely stressed metabolically, larger cells sink faster than small cells as dictated by Stokes' Law. In these cases, the slope of the sinking rate versus cell volume relationship within a culture reaches a maximum. Within cultures of rapid…
The gelation of organic solvents by low molecular weight gelators is an area of study still in its infancy. Difficulties in the design of universal gelators suitable for a wise variety of liquids arise because the self‐aggregation of teh molecules strongly depends on the polarity of the solvent. The bolaform amides pr…
The structure of concanavalin A, a saccharide-binding metalloprotein of subunit molecular weight 25000 Da§, is reported with precision and accuracy equivalent to those of small-molecule crystal structures. An X-ray data-to-parameter ratio of 6.1:1 has allowed the first unrestrained anisotropic refinement of a protein…
A local nonequilibrium approach to rapid solidification of undercooled alloys is presented. Taking into account the finite speed of mass signals, a steady-state solution to the nonisothermal rapid solidification problem has been obtained. We have found that, if the solidification front moves at a velocity V equal to o…
The three-dimensional structure of the 29-residue designed coiled coil having the amino acid sequence acetyl-E VEALEKK VAALESK VQALEKK VEALEHG-amide has been determined and refined to a crystallographic R-factor of 21.4% for all data from 10-A to 2.1-A resolution. This molecule is called coil-VaLd because it contains…
Titanium oxide and platinum have been intercalated into H 2 Ti 4 O 9 and H 4 Nb 6 O 17 by the successive reactions of H 2 Ti 4 O 9 and H 4 Nb 6 O 17 with [Pt(NH 3 ) 4 ]Cl 2 , n-C 3 H 7 NH 2 and acidic TiO 2 colloid solutions followed by UV light irradiation. The thicknesses of titanium oxide and platinum were less tha…
Abstract Members of the genera Rhodococcus and Nocardia corallina were investigated for their capability to accumulate storage lipids that occur in the cytoplasm during cultivation of the cells under nitrogen‐limiting conditions in the absence or presence of various effectors. All bacteria were able to accumulate tria…