Materials Literature
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The electric self-heating behavior of graphite-powder-filled high-density polyethylene is studied. Two equations are proposed to describe the electric-field dependence of the self-heating temperature and resistance dependence of the critical field. Based on Ohmic and non-Ohmic approximations and the heat-dissipation m…
By combining data from oxide melt solution calorimetry and 29 Si MAS-NMR spectroscopy, the enthalpy for short-range Si,Al ordering in b-eucryptite (LiAlSiO 4 ) was determined for a series of samples prepared by glass annealing. Si,Al ordered b-eucryptite gives a single 29 Si NMR peak for two unresolved crystallographi…
Numerical instability of the EMTP built-in model, the Saturable Transformer Component for the three-winding case, has been the topic of interest of the EMTP community for the past twenty years. Through theoretical analysis and computer simulation, the source of the numerical instability of the component is identified…
A highly polydisperse foam is subjected to a constant liquid flow from above. For sufficiently high flow rates, large-scale bubble motion is observed, in the course of which large bubbles rise to the top of the foam until a steady state is reached at which the average bubble size increases smoothly with height.
New mono- (5a–t, w) and biphotochromic (5u, v) 9′-styrylquinolinespirodihydroindolizines (DHIs) with IR-absorbing colored forms (4) were prepared. The conformation and configuration of these new DHIs were investigated by NMR studies and the structure was proved by x-ray analysis. The kinetics of the fast cyclizing pro…
An approach for the development of a new class of multifunctional photochromic liquid crystalline materials has been devised. Copolymerization of acrylic monomers allowed the preparation of ternary cholesteric copolymers containing nematogenic (phenyl benzoate), photochromic (azobenzene), and chiral photochromic side…
To clarify the influence of impurities on the sintering of SiC powder, three 6H‐SiC powder samples—with different levels of SiO 2 and aluminum impurities—were sintered with additions of boron and carbon. The densification, grain growth, and transformation of 6H‐SiC during sintering were studied qualitatively. The powd…
The mass of polyelectrolyte films adsorbed onto a surface during the deposition of a thin polymer film by a layer-by-layer sequential adsorption process was systematically controlled using a feedback system with a computer. For the deposition process, a quartz crystal microbalance (QCM) with an integrated oscillation…
The chlorination of vulcanized styrene-butadiene rubbers (SBRs) with trichloroisocyanuric acid (TCI) has been studied. The solvent used to apply the TCI chlorinating solutions on the rubber plays an important role in the effectiveness of the treatment since the solvent determined the degree of penetration of TCI into…
Millimeter-sized tubular crystals of Ag2Se are successfully grown for the first time via a hydrothermal reaction route from AgCl, Se and NaOH at 155 °C.
The potential applicability of high-resolution electron microscopy (HREM), in combination with image analysis and image simulation tools, to retrieve structural information from nanometre-sized particles present in oxide-supported metal and oxide catalysts is analysed. Specifically, the possibilities and limitations o…
The static electric dipole polarizabilities and second-order hyperpolarizabilities of several bare boron clusters have been calculated with density functional theory. The average second-order hyperpolarizability γav reaches a saturation limit of about 50,000 a.u. already with B5 for a given type of structure. The aver…
The geometry, vibrational frequencies and stability of the structural isomers of small gallium nitride clusters (n = 2–4) have been investigated using density functional theory. The lowest energy structures are cyclic. The ground electronic state of the cyclic forms for n > 2 is the singlet state. All of the cyclic st…
A polymeric precursor method was used to synthesis PbTiO3 amorphous thin film processed at low temperature. The luminescence spectra of PbTiO3 amorphous thin films at room temperature revealed an intense single-emission band in the visible region. The visible emission band was found to be dependent on the thermal trea…
The π-conjugated polymer poly(p-diethynylbenzene) (PDEB) has potential applications in electronics and optics; however, its poor solubility and processability have limited its usefulness. The new synthesis reported here makes use of a novel nickel catalyst, and gives rise to PDEB with good solubility and excellent the…
We propose and demonstrate alkali bismuth gallate glasses as suitable hosts for the rare earth praseodymium (Pr3+) operating at 1.3-µm wavelength. The structure of the glasses was investigated by Raman spectroscopy. The optical absorption and the photoluminescence properties of Pr3+ in these glasses were characterized…
Olefins were smoothly epoxidized under O2 (1 atm) in the presence of a hydrocarbon such as ethylbenzene or tetralin, using N-hydroxyphthalimide (NHPI) and Mo(CO)6 as catalyst; the present reaction involves autoxidation of the hydrocarbon assisted by NHPI and epoxidation of alkenes with the resulting hydroperoxide cata…
Polypropylene (PP) was functionalized with acrylic acid (AA) and styrene (st) as a comonomer by means of a radical-initiated melt-grafting reaction. FTIR, ESCA, and 1H-NMR spectroscopies were used to characterize the formation of polypropylene grafted with acrylic acid (PP-g-AA) and polypropylene grafted with acrylic…
The identification of fullerene-like sites on carbon black surface and in particular the pentagonal or corannulene-type sites, has permitted us to explain the chemical interaction between filler and polymer (diene rubber) occurring during mixing in terms of free radical and Diels-Alder addition of polymer chains on th…
The atomistic simulation of properties and phenomena in solid materials requires a suitable model of the real system with a number of atoms which is still manageable at the chosen level of approximation. Since typical solids consist of atoms in the order of 1023, only a very small fraction of them can be treated expli…