Materials Literature
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Diffusion limited reactions of point defects were investigated in amorphous SiO2 exposed to UV laser light. Electron spin resonance and in situ absorption measurements at room temperature evidenced the annealing of E' centers and the growth of H(II) centers both occurring in the post-irradiation stage and lasting a fe…
The self-assembly of diaminododecane with dendritic l-lysine-based peptides to form gel-phase materials was investigated in a range of different solvents. The degree of structuring was modulated by the solvent employed, an effect which induced subtle changes in the mesoscale aggregate morphology and macroscopic behavi…
We show that the electron and hole Lande g factors in self-assembled III-V quantum dots have a rich structure intermediate between that expected for paramagnetic atomic impurities and for bulk semiconductors. Strain, dot geometry, and confinement energy significantly modify the effective g factors of the semiconductor…
Thermoluminescence (TL) kinetics in spatially inhomogeneous systems can be studied by various Monte Carlo algorithms. Recently, a new analytical approach was suggested for the isolated cluster model. The theory is based on the concept of trap structural functions (TSFs). TSFs depend solely on topological properties of…
Standard one-carrier kinetic models for thermoluminescence (TL) relate to the simple trap model (STM) and the model of localized transitions (LT). This paper presents a review of TL properties in various spatially correlated systems (SCS) which span the two limiting cases. A classification of kinetic models for SCS is…
We report first-principles linear response calculations on $\mathrm{Na}\mathrm{Co}{\mathrm{O}}_{2}$. Phonon frequencies and eigenvectors are obtained throughout the Brillouin zone for two geometries with different Na site occupancies. While most of the phonon modes are found to be insensitive to the Na site occupancy,…
An AB2 monomer containing a bis(m-phenylene)-32-crown-10 and two paraquat moieties was designed and prepared. It self-organized to form a supramolecular hyperbranched polymer in solution.
Abstract Summary: The flame retardant mechanisms of red phosphorus, magnesium hydroxide and red phosphorus combined with magnesium hydroxide were studied in high impact polystyrene by means of comprehensive decomposition studies and combustion tests. The study is intended to illuminate prerequisites and the potential…
We show that the dimensions of carbon nanotubes (CNTs) in suspension can be characterized by depolarized dynamic light scattering. Taking advantages of this in situ technique, we investigate in detail the influence of sonication procedures on the length and diameter of CNTs in surfactant solutions. Sonication power is…
The peculiar redox-active character of quinonoid metal complexes makes them extremely appealing to design materials of potential technological interest. We show here how the tuning of the properties of these systems can be pursued by using appropriate molecular synthetic techniques. In particular, we focus our attenti…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTetrathiafulvalenes, Oligoacenenes, and Their Buckminsterfullerene Derivatives: The Brick and Mortar of Organic ElectronicsMichael Bendikov, Fred Wudl, and Dmitrii F. PerepichkaView Author Information Department of Chemistry and Biochemistry and Exotic Materials Institute, U…
Abstract For high-strength steels developed at the National Institute for Materials Science (NIMS) in Japan, a dispersion of nano-sized MX nitride particles along boundaries and in the matrix is achieved by reducing carbon concentration below 0.02%. This structure results in excellent creep strength at 923K, approxima…
Abstract A collaborative program by the U.S. Department of Energy and Ohio Coal Development Office aims to identify new materials for ultrasupercritical (USC) coal power plants operating at significantly higher efficiencies. These USC plants require advanced ferritic alloys, austenitic steels, and nickel-based alloys…
Abstract Tempered martensitic 9-12%Cr steels bearing tungsten, such as P92 and P122 showing higher creep rupture strength than the conventional steel P91, have been developed for thick section components in ultra-supercritical (USC) boilers. However, their creep strength is not sufficient for applying at the steam con…
Abstract Since the 1990s, the power plant market has shifted towards more flexible and efficient Steam Power Plants (SPPs) with fewer service inspections and lifetimes of ≥200,000 hours, including combined-cycle applications. This shift has driven efforts to enhance both design and materials. One approach is the insta…
Methods for the crystal structure determination from powder diffraction data are reviewed with special emphasis on the application to technical ceramics.Experimental techniques using other than laboratory X-ray, such as synchrotron radiation, neutron and electron beams, are also described.As an illustrative example, t…
Abstract The influences of ultrasonic oscillations on rheological behavior and mechanical properties of metallocene‐catalyzed linear low‐density polyethylene (mLLDPE)/low‐density polyethylene (LDPE) blends were investigated. The experimental results showed that the presence of ultrasonic oscillations can increase the…
Abstract High‐abrasion furnace black (HAF, grade N330)–filled powdered styrene butadiene rubber [P(SBR/HAF)] was prepared and the particle size distribution, mixing behavior in a laboratory mixer, and mechanical properties of P(SBR/HAF) were studied. A carbon black–rubber latex coagulation method was developed for pre…
Abstract New high temperature polyaryleneetherketone triphenylphosphine oxides incorporating trans ‐1,4‐cyclohexane, 1,3‐adamantane, and 4,9‐diamantane structural units were synthesized by the base‐promoted polymerization reaction between 4,4′‐difluorotriphenylphosphine oxide and the novel dihydroxy monomers trans ‐1,…
<div class="htmlview paragraph">Three-way catalyst systems for gasoline engines do not activate under engine cold start conditions since exhaust gas temperature is low. Zeolite based hydrocarbon (HC) adsorber substrate stores high-concentration HC emitted immediately after engine start and oxidizes when HC is re…