Materials Literature
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Biodegradable and biocompatible poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV), a copolymer of microbial polyester, was fabricated as a nanofibrous mat by electrospinning. The specific surface area and the porosity of electrospun PHBV nanofibrous mat were determined. When the mechanical properties of flat film an…
Pure, Nb-doped and Ag-doped titania nanoparticles were synthesized by sol-gel technique with dopant concentrations ranging from 0.5 to 1.5 atomic percent Nb or Ag. The annealing temperatures ranged from 250 to 900 °C. Changes in phase transformation of the doped samples with reference to pure titania were studied. It…
The four optical spectrum bands (or d-d transitions) and six spin Hamiltonian parameters (g factors gx, gy, gz and hyperfine structure constants Ax, Ay, Az) of the rhombic Zr3+ (4d1) center in Y3Al5O12 crystal are calculated from the complete diagonalization (of energy matrix) method and the perturbation theory method…
For more than 200 years, the beautiful “molybdenum blue solutions†have been a puzzle for chemists because they could not determine the molecular structures of the solutes while experiments showing the Tyndall effect proved the presence of “giant speciesâ€. This problem was finally solved in Bielefeld. As a resul…
For a thermoelectric module (TEM) operating in refrigeration mode, the cooling flux provided by it, its coefficient of performance and its operating voltage per unit footprint are key parameters. They are provided here as a function of the temperatures on both sides of a TEM, current flow through it, electrical contac…
A novel combination microelectrode was constructed based on an iridium pH microelectrode and an Ag/AgCl microelectrode, and was applied to simultaneously monitor the steel potential, pH and chloride ion concentration in a crevice simulating disbonding of pipeline coatings with cathodic protection (CP) applied or remov…
Abstract Thermoplastic vulcanizates (TPVs) have gained large technical and economic importance. TPVs are characterized by a chemically crosslinked rubber phase, embedded in a thermoplastic matrix, produced by dynamic vulcanization during mixing with the thermoplastic in its molten state. Methacrylate species are inves…
Abstract Transparent conducting undoped and indium‐doped zinc oxide (ZnO) thin films have been deposited by the spray pyrolysis method at 350 °C substrate temperature. X‐ray diffraction spectra of the films have shown that the films are polycrystalline and hexagonal wurtzite in structure. The average optical transmitt…
The potential use of metamaterial planar bilayers for synthesizing compact subwavelength leaky-wave radiators in the microwave regime is analyzed in detail. In particular, the possibility of pairing "complementary" metamaterials in order to reduce the dimensions of microwave components is explored for the leaky-wave o…
Recent studies have predicted that heterostructure superlattices can enhance the effective thermoelectric power factor significantly through selective emission of hot carriers via thermionic emission. Here, we study the potential of SiGe∕Si superlattices for power generation at high temperatures. A detailed theory bas…
Biodegradable polymers, both synthetic and natural, often show poor foamability, in terms of the ability to form a fine-celled structure and to retain it. In fact, foams with high density and/or non uniform morphology are generally obtained with these materials. Poor rheological properties, poor solubility and inadequ…
The van der Waals-London dispersion (vdW-Ld) spectra are calculated for the [9,3,m] metallic and [6,5,s] semiconducting single wall carbon nanotubes (SWCNTs), graphite, and graphene (a single carbon sheet of the graphite structure) using uniaxial optical properties determined from ab initio band structure calculations…
Abstract We have studied the color center production in yttria‐stabilized zirconia single crystals (i.e. ZrO 2 : Y with 9.5 mol% Y 2 O 3 ) with the (100) orientation, by electron irradiations at energies ranging between 1.0 and 2.5 MeV. Electron paramagnetic resonance (EPR) measurements show that three paramagnetic ce…
Electron beam induced deposition (EBID) and etching (EBIE) are promising methods for the fabrication of three-dimensional nanodevices, wiring of nanostructures, and repair of photolithographic masks. Here, we study simultaneous EBID and EBIE, and demonstrate an athermal electron flux controlled transition between mate…
This research examined the cylinder liner-piston ring system simultaneously from the metallurgical and metrological standpoints, using specimens cut from real engine components (rings and liners), in order to identify the mild and severe wear mechanisms. Work has been conducted using a Plint TE77 high frequency fricti…
Electrolysis of water produces high‐purity hydrogen directly, with no need for additional clean‐up process. Efficiency and cost of electrolysis are favorable with high‐temperature steam electrolyzers where a portion of the required energy can be supplied as thermal energy. With the similarity in requirements, much of…
Cobalt nanowire arrays have been grown onto anodic aluminum oxide templates by using a pulse dc electrodeposition technique. We demonstrate that the crystal structure, grain size, and related magnetic properties can be controlled by applying different pulse frequencies. For a pulse frequency of 25Hz, monocrystalline h…
Lanthanide(III) complexes of polyaminocarboxylates are widely used in MRI as contrast agents. The paramagnetic properties of the metal ion contribute to the increase of (1)H relaxation rates, while the chelate offers a stable binding with the metal. The number of water molecules, coordinated directly to the Ln(III) io…
We first establish the literature on the use of ultradilute aquasols as extraordinary, powerful, bactericidal inorganic agents equal to most commercial antibiotics. These findings provide the rationale for a major role for inorganic materials scientists to contribute the insights unique to their field for new, safer h…
Substituting small contents of aluminum for nickel in nickel hydroxides by a chemical coprecipitation and a subsequent hydrothermal process can yield stable positive electrode materials. Detailed studies on the structural evolution were conducted by X-ray diffraction (XRD), scanning electron microscopy (SEM), and tran…