Materials Literature
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The electronic absorption spectra of several phthalocyanines substituted at the so-called α-, β- and α and β-positions of the macrocycle have been recorded in solution and as films (α = 1,4,8,11,15,18,22, and 25 positions or 1,8 (or 11),15 (or 18), and 22 (or 25) positions, and β = 2,3,9,10,16,17,23, and 24 positions…
Abstract A new thermoset material based on DGEBA with polyaminosiloxane curing agents is presented. The system shows reaction‐induced compatibilization which prevents coalescence of polysiloxane and DGEBA rich domains, leading to gradient structured morphologies. The influence of curing temperature and/or chemical nat…
Ferroelectrics with a spatial variation in the polarization exhibit behavior and properties that are not routinely observed from homogenous bulk or thin film ferroelectrics. A systematic spatial variation in the polarization in a ferroelectric material can be achieved by variations in the composition of the material,…
Abstract A new series of semi‐crystalline polyamides (PA), which comprise extended aliphatic segments between the amide moieties and which display an interesting amphiphilic character has been synthesized and characterized. The polymers PA‐2.34 , PA‐4.34 , PA‐8.34 , PA‐10.34 , and PA‐12.34 were prepared by melt‐polyco…
Abstract Bei Versuchen zur Darstellung von anionisch derivatisierten Holmium‐Oxotelluraten durch Reaktion von Holmiumtrichlorid (HoCl 3 ) mit Tellurtrioxid (TeO 3 ; molares Verhältnis 1:2, 800°C, 10 d) in evakuierten Kieselglasampullen wurden transparente, grünlich gelbe und derbe Einkristalle des Holmium(III)‐Chlorid…
The influence of golf course operation and construction on benthic algal communities in headwater streams on the Precambrian Shield was investigated using a reference condition approach. Streams were sampled for water chemistry and epilithic benthic algae on operational golf courses, on courses under construction, and…
In the original description of fragility, Angell (1988 J. Phys. Chem. Solids 49 863) determined the degree of fragility from the curvature on an Arrhenius plot. This paper discusses a new measurement of the fragility value. The fragility of Al–Ni-based glass-forming melts, which is seldom reported in this field, can b…
The yarn architecture of 3-D braided composites products by the four-step 1 × 1 braiding technique has been studied by means of a control volume method in conjunction with experimental investigation and a numerical method, respectively. An ellipse assumption for the cross-section of yarn was proposed in this analysis…
Cavitation bubbles accompany explosive vaporization of water following pulsed energy deposition in liquid media. Bubbles collapsing at the tip of a surgical endoprobe produce a powerful and damaging water jet propagating forward in the axial direction of the probe. We studied interaction of such jet with tissue using…
Abstract A series of 2,2‐bis(hydroxymethyl)propionic acid (Bis‐MPA) hyperbranched aliphatic polyesters with different molecular weights (generations) is analysed for the first time by time‐of‐flight secondary ion mass spectrometry (ToF‐SIMS). The main negative and positive low‐mass fragments are identified in the fing…
Cubic cesium leucite‐based compounds, namely cesium leucites, cesium sodium leucites, and cesium lithium leucites, were synthesized using a multistep solid‐state reaction method. The thermal expansion properties, in the temperature range of 298‐1273 K, for the synthesized cubic cesium leucite‐based compounds were exam…
Sulfonated polyrotaxanes (PRx-SO(3)'s), in which sulfonated alpha-cyclodextrins (alpha-CDs) were threaded onto the poly(ethylene glycol) (PEG) segments in a PEG-b-poly(propylene glycol) (PPG)-b-PEG triblock copolymer (Pluronic) capped with benzyloxycarbonyl (Z)-L-phenylalanine (Z-L-Phe), were prepared as a novel surfa…
Magnetically induced phase separation along the Curie temperature in the hexagonal-close-packed phase of a Co–Mo binary system has been predicted by thermodynamic calculations. Furthermore, the phase separation and magnetic properties of Co–Mo sputtered thin films have been investigated. Nanoscale compositional fluctu…
Pulsed magnetic field (0–4.4 T) was used to study the magnetic field dependent resistivity (12–350 K) and thermoelectric power (0–1.5 T) of Na and K-doped La0.7Ca0.7−yAyMnO3 (0.0⩽y⩽0.3, A=Na, K) system showing semiconducting to metallic transitions around temperature Tp. Na/K-doping increases both conductivity and Tp.…
The PZT-based ceramics with a composition of Pb1 − 0.5x (Zr0.52Ti0.48)1 − x Nb x O3; x = 0.04–0.06 were prepared by conventional mixed-oxide method, with sintering temperature at 1200°–1300° for 2 hours. Microstructural and compositional analyses of the PZT-based ceramics have been carried out using XRD and SEM. The d…
Alumina oxide was deposited in the straight nanosize pores of Anopore alumina membrane by the alternative introduction of trimethylaluminum (TMA) and water vapor to the membrane pores. The chemical vapor deposition (CVD) modification was conducted under two different schemes: (1) cyclic CVD with residual pressure and…
Abstract In the present work broadband dielectric relaxation spectroscopy measurements were employed to investigate the dielectric properties of polymer composites. A polyethylene/polyoxymethylene (PE/POM) thermoplastic blend was used as a matrix, while the inclusions were iron (Fe) particles. For comparison, the two…
Abstract Recent studies have demonstrated that highly multilayered blend morphologies can be formed by chaotic mixing and captured within extrusions of various forms. The number and thickness of internal layers prior to layer breakup and the extent of breakup are controllable via specification of process variables. A…
A new apparatus is developed to measure the Water vapor permeability resistance of textiles with and without temperature differences imposed on both sides of a specimen. Water vapor resistance is measured for a combination of temperature and pressure that simulates elevated altitudes. The effect of temperature on wate…
Abstract Nanostructural analysis of pillared clay samples using high-resolution transmission electron microscopy has been developed. Montmorillonite samples were pillared using partially hydrolyzed Al and Fe solutions. Two samples, M01 and M05, corresponding to Fe/(Fe+Al) ratios of 0.1 and 0.5, respectively, were anal…