Materials Literature
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The geometry of the spinning triangle influences the distribution of fiber tension in the spinning triangle and fiber tensile stresses within the yarn and, thus, affects the component of yarn torque due to these stresses. In this study, a modified energy approach was adopted to study the distribution of fiber tension…
Here, we explore theoretically the concept of enhanced directivity from electrically small subwavelength radiators containing negative-parameter materials, such as plasmonic materials with negative permittivity at THz, infrared and optical frequencies. In particular, we study higher order plasmonic resonances of a sub…
We report a unique tribological system that produces superlubricity under boundary lubrication conditions with extremely little wear. This system is a thin coating of hydrogen-free amorphous Diamond-Like-Carbon (denoted as ta-C) at 353 K in a ta-C/ta-C friction pair lubricated with pure glycerol. To understand the mec…
Abstract In this research, the influences of adding talc mineral particles of 10 μm particle size on the shrinkage and the mechanical properties of injection molded polypropylene (PP)/talc composites were investigated. PP has a crystalline molecular structure and hence it possesses nonisotropic shrinkage along and acr…
Possible areas of application of magnetoelectric materials and multiferroics in microelectronics, spintronics, and sensor technique are considered. Criteria of practical applicability of such materials are formulated and examples of magnetoelectric materials satisfying these criteria are given.
BACKGROUND AND AIM OF THE STUDY: Although the six-month-old pig is commonly used as a model to study human heart valve biology and various age-specific valve diseases, the correlation of porcine valve biology and development with that of humans has not been thoroughly assessed. Given the important role of the matrix i…
The authors report a silicon-on-insulator (SOI) process for the fabrication of ultrahigh aspect ratio freestanding gratings for high efficiency x-ray and extreme ultraviolet spectroscopy. This new grating design will lead to blazed transmission gratings via total external reflection on the grating sidewalls for x rays…
In several recent applications, including those aimed at developing thermal interface materials, nanoparticulate systems have been proposed to improve the effective behavior of the system. While nanoparticles by themselves may have low conductivities relative to larger particles owing to interfacial resistance, their…
Abstract Poly(ethylene terephthalate) (PET) is chemically degraded during processing and/or using by a number of sources including temperature, humidity, and ultraviolet radiation. As a consequence, a large loss in engineering properties is observed when PET products are recycled. To overcome this problem, various typ…
We report evidence for the phase coexistence of orbital orderings of different symmetry in $R\mathrm{V}{\mathrm{O}}_{3}$ compounds with intermediate-size rare earths. Through a study by high-resolution x-ray powder diffraction and thermal expansion, we show that the competing orbital orderings are associated with the…
This work focuses on the impact of oxidizing and reducing ash chemistries on the modifications of two porous SiOCH films with varied porosities (8% [low porosity (lp)-SiOCH] and 45% [high porosity (hp)-SiOCH]). The ash processes have been performed on SiOCH blanket wafers in either reactive ion etching (RIE) or downst…
A number of volatile phosphorus-containing flame retardant species has been identified as possible replacements for bromine-containing formulations used in textile back-coatings because of the need for vapor-phase activity. The selected retardants include tributyl phosphate (TBP), a monomeric cyclic phosphonate Antibl…
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The structural and electronic properties of armchair and zigzag ZnO nanotubes were studied using density functional theory with the generalized gradient approximation. It was found that the strain energy required for rolling a ZnO graphitic sheet into a tube is lower than those for BN and GaN nanotubes. Both the armch…
We present temperature-dependent electrical characteristics of vertically aligned carbon nanofiber (CNF) arrays for on-chip interconnect applications. The study consists of three parts. First, the electron transport mechanisms in these structures are investigated using I-V measurements over a broad temperature range (…
The electrical-insulation degradation of BaTiO3 is now of growing interest as the BaTiO3-based dielectric layers of multilayer ceramic capacitors are getting thinner to submicron thicknesses. The degradation is understood to be due to the electrotransport of oxygen vacancies and may be monitored by the colors emanatin…
Lead-free piezoelectric (1- x )(K 0.48 Na 0.52 )NbO 3 – x LiSbO 3 [(1- x )KNN– x LS] ceramics were prepared by conventional sintering. A morphotropic phase boundary (MPB) between the orthorhombic and tetragonal phases was identified in the composition range of 0.04< x <0.06. The ceramics near the MPB exhibit a strong…
Two mixed-valence polyoxometalates were shown to serve both as good reductants of silver cation and efficient capping agents for the resulting metallic nanostructures. Both nanowires and spherical nanoparticles were observed, showing for the first time that polyoxometalates can also induce the synthesis of one-dimensi…
Biologically derived polyesters known as polyhydroxyalkanoates (PHAs) represent a potentially "sustainable" replacement to fossil-fuel-based thermoplastics. However, current commercial practices that produce PHA with pure microbial cultures grown on renewable, but refined, feedstocks (i.e., glucose) under sterile cond…
This work discusses quantitative aspects of energy transfer occurring in sol−gel derived organic−inorganic di-ureasil hybrids incorporating either [Eu(btfa) 3 (4,4‘-bpy)(EtOH)] (btfa = benzoyltrifluoroacetonate, 4,4‘-bpy = 4,4‘-bipyridine) or Eu(CF 3 SO 3 ) 3 . Host-to-Eu 3+ energy transfer occurs either via ligand si…