Materials Literature
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A simple, inexpensive, and rapid electrophoresis technique was developed for use as a routine tool for evaluating purity of polyamidoamine (PAMAM) dendrimers. A variety of factors influencing migration of generations 0-7 dendrimers on nongradient polyacrylamide gels were evaluated. The low generation dendrimers were f…
This article deals with different aspects of photo-induced processes in dendrimers, such as site isolation, energy and electron transfer processes, and photo-isomerisation of peripheral groups. By discussing several examples, from our own work, we intend to give some more insight with respect to these topics.
The absolute specific heat capacity of poly(α-methyl styrene) and mixtures with its pentamer were found to be independent of concentration at temperatures from 240 to 480 K. Extrapolation to 100% polymer yielded the equilibrium specific heat capacity for the polymer at temperatures as much as 180 K below the glass tem…
The optical absorption spectrum of the as-grown ${\mathrm{PWO}}_{4}$ crystal mainly exhibits a weak band peaking at 350 nm, overlapping with the absorption edge of the crystal. The ultraviolet-irradiated crystal emits a strong band peaking at 420 nm and a broad band in the range of 500--700 nm almost in pairs along wi…
Two commercially available additive‐containing silicon nitride materials were exposed in four environments which ranged in severity from dry oxygen at 1 atm pressure, and low gas velocity, to an actual turbine engine. Oxidation and volatilization kinetics were monitored at temperatures ranging from 1066° to 1400°C. Th…
Friction between fibers inside yarns is generally important for determining the physical behavior of textiles. The tendency of cellulosic fibers to slide in a yarn directly influences the extent of fuzz formation during abrasive treatment. This paper presents a test method to determine the slipping behavior of fibers…
Doubly doped YVO4:Pb2+, Eu3+ red phosphor materials with fixed Eu3+ concentration (5 mol%) and varying Pb2+ concentration were prepared via a self-propagating (combustion) synthesis. This consisted of bringing a saturated aqueous solution of the desired metal salts and a suitable organic fuel to the boil, until the mi…
The structure of (NH 4 ) 0.5 V 2 O 5 · m H 2 O ( m ≈ 0.9), a representative member of the family of intercalated solids with reduced V 2 O 5 xerogel framework, has been successfully determined using the atomic pair distribution function (PDF) technique. We show that at the atomic scale (NH 4 ) 0.5 V 2 O 5 · m H 2 O is…
Recovery stresses generated by neat shape memory wires under different constraint conditions have been studied in detail. The thermomechanical conditions applied in the experiments were very close to the biasing conditions in polymer composites with embedded shape memory wires. The parameters of the present experiment…
We have succeeded to grow chemical-vapor-deposited diamond films at reasonably high growth rates using high microwave power of 3.8 kW and high methane concentration ratios (CH4/H2) of ≥4.0%. Growth rates of ≥2 μm/h have been attained for (100) homoepitaxial growth by utilizing high-density microwave plasma. These homo…
Isolated single-walled carbon nanotubes (CNTs) were grown by chemical vapor deposition methods on Fe/Mo/Al 2 O 3 catalysts, which were patterned by microcontact printing. The pattern allowed us to trace back and investigate the same isolated CNT by atomic-force (AFM) and confocal Raman microscopy with different excita…
Optical properties of Eu3+ ions in oxyfluoride glasses and glass ceramics doped with two different concentrations, 0.1 and 1 mol %, have been analyzed and compared with previous results for higher concentrated samples, 2.5 mol %. The Eu3+ ions in the 0.1 mol % doped glass ceramics are diluted into like crystalline env…
The fluctuation-dissipation relation (FDR) is measured on the dielectric properties of a polymer glass (polycarbonate) in the range 20 mHz–100 Hz. It is found that after a quench below the glass transition temperature, the fluctuation-dissipation theorem is strongly violated. The amplitude and the persistence time of…
The effect of pressure on melt viscosity was investigated in the system NaAlSi 3 O 8 -CaMgSi 2 O 6 (Ab-Di) at pressures from 0.1 to 400 MPa using a parallel plate viscometer. The new measurements in the high viscosity range of 10 8.5 -10 11 Pa·s are consistent with previous data obtained at higher temperature (lower v…
Although genetic and biochemical studies suggest a role for Eps15 homology domain containing proteins in clathrin-mediated endocytosis, the specific functions of these proteins have been elusive. Eps15 is found at the growing edges of clathrin-coated pits, leading to the hypothesis that it participates in the formatio…
A four-parameter approximating formula, R=A e a x b f(x), accurately represents the skyshine line beam response function (LBRF) as a function of the distance (x) of the source-to-detector separation. Here, A is a constant for a given source energy and f(x)=e cx x dx is a damping factor. The four parameters are obtaine…
Abstract Blends covering the entire range of compositions of a metallocenic ethylene‐1‐octene, CEO, copolymer and two conventional isotactic polypropylenes, iPP, of different molecular weights have been prepared, analyzing the effect of composition and molecular weight on the crystallization (studied by DSC and X‐ray…
We have succeeded in preparing amorphous carbon disulphide (CS 2 ) by depositing its vapour on a cold substrate at 10 K. Complete formation of the amorphous state has been confirmed by neutron diffraction and differential thermal analysis (DTA). The amorphous sample crystallised at ca. 70 K, which is lower than the hy…
We have developed a method for measurement of internal stress in glass articles. The method uses Rayleigh‐scattered light from a properly polarized laser beam propagating through glass at an oblique angle. This light is imaged with an electronic focal plane array camera. The method is similar to earlier published meth…
The formation of crystals from solutions containing sodium carbonate and sodium sulfate is a complex process that often results in fouling of heat-transfer surfaces. Complexity results from a dependence of the composition of crystals formed on the composition of the solution, and the solution composition changes with…