Materials Literature
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The temperature dependence of the Hall mobility µ H has been measured from 140 to 870 K for nine boron-doped homoepitaxial chemical vapor deposition (CVD) diamond thin films. The experimental µ H data are compared with their theoretical µ H values that are calculated by an iterative technique, assuming scattering by i…
The origin of the linear relationship between the reaction energy of the CH2/NH/O exo and endo additions to armchair (n, n) single-walled carbon nanotubes (SWNTs) and the inverse tube diameter (1/d) measuring sidewall curvature was elucidated using density functional theory and density functional tight binding methods…
In this paper a physical basis for the variation in loss coefficients is developed. The standard three-term core loss separation model is assumed under sinusoidal (alternating) excitation. Some important material and operational properties that are often neglected in the literature when developing core loss models are…
In this paper, we review our main results on the optical and electrical properties of light-emitting silicon nanocrystals (Si-ncs) obtained from the thermally induced nucleation in amorphous silicon-rich nitride (SRN) films deposited either by plasma-enhanced chemical vapor deposition (PE-CVD) or magnetron sputtering.…
The electron spin resonance (ESR) technique was employed to investigate the point defects and evidence of Eu 2+ in Eu-doped barium titanate (EBT) ceramics sintered in air according to the formula (Ba 1- x Eu x )Ti 1- x /8 O 3 . The charge equilibrium compensation mechanism was discussed on the basis of ESR with the ai…
Localization in a quasibrittle material is studied using a local second-gradient model. Since localization takes place in a medium assumed to be initially homogeneous, nonuniqueness of the solutions of an initial boundary value problem is then also studied. Using enhanced models generalizes the classical localization…
Generally, it has been assumed that signal intensity variations in back-scattered electron (BSE) images of minerals are mainly controlled by chemical heterogeneity. This is especially true for images of single crystals, where effects of different crystal orientations with respect to the incident beam on the observed B…
Various families of soft ferrites (Ni–Cu–Zn; Mg–Cu–Zn; Co 2 –Z; Mn–Zn) with a sintering temperature of T ≤950°C are used for multilayer inductors. It is shown for Ni–Cu–Zn and Mg–Cu–Zn ferrites that composition, powder particle size, and sintering additive concentration strongly affect the shrinkage, sintering behavio…
Abstract Poly(vinyl pyrrolidone) was grafted onto crosslinked polystyrene beads through the 2‐chloroethyl sulfonamide (CSA) groups present in the resin using the atom transfer radical polymerization (ATRP) method. A beaded polymer with a poly(vinyl pyrrolidone) surface shell was prepared in three steps, starting from…
In this paper, we report correlations between processing, microstructure, and electrical properties of Ga doped ZnO films. Films with different grain sizes were grown on amorphous glass substrate by changing the substrate and pulsed laser deposition variables. The results corresponding to these films were compared wit…
We have demonstrated that one-dimensional supramolecular dye assemblies with a uniform diameter can be created by utilizing schizophyllan (SPG) as a one-dimensional host. In the supramolecular nanofibers, the dye molecules are assembled into the different aggregation modes depending on the preparation procedures. The…
Common gastropods such as snails crawl on a solid substrate by propagating muscular waves of shear stress on a viscoelastic mucus. Producing the mucus accounts for the largest component in the gastropod’s energy budget, more than 20 times the amount of mechanical work used in crawling. Using a simple mechanical model,…
Short sun hemp and palmyra fiber reinforced polyester composites are developed using varied fiber lengths and weight ratio. The variation of tensile load at break with varied fiber length and varied weight ratios has been studied. The optimum length of fiber and optimum weight ratios of respective fibers are found in…
Abstract In 2000, salt precipitates were found on surfaces of the Swedish warship Vasa , accompanied by low pH values, partly as a result of oxidation of accumulated sulfur compounds. One hypothesis is that oxidation of the sulfur compounds was catalysed by the large amounts of diverse iron compounds present in the wo…
Crucial for the development of enhanced electrooptic materials is the construction of highly anisotropic materials. Nematic liquid crystals are able to control the chain conformation and alignment of poly(phenylene ethynylene)s (PPEs), producing electronic polymers with chain-extended planar conformations for improved…
The relationships between 49 naviculoid diatoms, currently arranged in 14 families and four orders were investigated using cladistic analysis in order to test the types of characters used in diatom systematics and to assess how well the current classification reflects possible phylogenetic relationships in this group.…
Hollow polyelectrolyte multilayer capsules made of ionizable segments (e.g., carboxylic acid, amine, pyridine) have an equilibrium size that is independent of salt concentration and pH in a wide pH range but swell to a larger size at lower and higher pH. Besides, at the edges of the stability plateau their equilibrium…
Phosphohedyphane, Ca 2 Pb 3 (PO 4 ) 3 Cl, space group P6 3 /m, a = 9.857(1), c = 7.130(2) Å, V = 599.9(2) Å 3 , Z = 2, is a new mineral from the Capitana mine, Copiapó, Atacama Province, Chile and has been identified from numerous other deposits world-wide. At the Capitana mine, it occurs as transparent, colorless, ta…
Thin films of metallophthalocyanine (MPc,M=Co,Ni) evaporated onto a “5×20” reconstructed Au(001) substrate at room temperature have been investigated by employing low energy electron diffraction (LEED) and ultraviolet photoelectron spectroscopy (UPS). The LEED images from NiPc thin films show that the overlayers are h…
The SOFC group at Forschungszentrum Juelich has assembled and tested more than 220 SOFC stacks during the last 10 years, rated between 100 W and 15 kW. The topics of high‐performance materials, corrosion, materials compatibility, and cost‐effectiveness, including manufacturing processes, etc., are being continuously a…