Materials Literature
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We propose a model to study the plasticity of ice single crystals by numerical simulations. The model includes the long-range character of the interaction among dislocations, as well as the possibility of mutual annihilation of these line defects characterized by its Burgers vector. A multiplication mechanism represen…
A novel and efficient calcium alkoxide initiating system, generated in situ from bis(tetrahydrofuran)calcium bis[bis(trimethylsilyl)amide] and an alcohol, for the ring-opening polymerization of cyclic esters has been developed. The solution polymerization in THF using mild conditions is living, yielding polyesters of…
Magnets synthesized from molecules have contributed to the renaissance in the study of magnetic materials. Three-dimensional network solids exhibiting magnetic ordering have been made from several first-row metal ions and bridging unsaturated cyanide, tricyanomethanide, and/or dicyanamide ligands. These materials poss…
Statistical studies of fluorescence intermittency in single CdSe nanocrystal quantum dots (QD's) reveal a temperature-independent power-law distribution in the histogram of on and off times---the time periods before the QD turns from emitting to nonemitting (bright to dark) and vice versa. Every QD shows a similar pow…
Ordered mesoporous carbons have recently been synthesized using ordered mesoporous silica templates. The synthesis procedure involves infiltration of the pores of the template with appropriate carbon precursor, its carbonization, and subsequent template removal. The template needs to exhibit three-dimensional pore str…
The thermal transitions, microphase structure, local segmental and conductivity relaxation of the novel polyurethanes (PUs) based on the poly(tetramethylene glycol) as soft segments (SSs) and 4,4′-diphenylmethane diisocyanate-1,4-butane diol sequences of various length as hard segments (HSs) containing ionic groups in…
Second-harmonic generation in the ternary layered semiconductor TlInS2 excited with the wavelength λ = 1.06 μm of YAG: Nd3 + laser is investigated in the temperature range corresponding to the low-temperature phase transitions. It is shown that the intensity of the second-harmonic signal corresponding to the non-linea…
Abstract The physical and mechanical properties of ternary composites based on isotactic polypropylene (iPP) and ethylene—octene copolymer blends reinforced with poly(ethylene terephthalate) (PET) fibers have been studied. In order to evaluate the effect of the matrix composition and fiber content on the final propert…
The thermal conductivities of alkali silicate melts containing fluorides have been determined using the non-stationary hot wire method. Measurements were carried out over the temperature range 1050–1550 K on the following six samples: Li2O–2SiO2, Na2O–2SiO2, 0·7Li2O–0·6LiF–2SiO2, 0·9Na2O–0·2NaF–2SiO2, 0·7Na2O–0·6NaF–2…
Austempering kinetic measurements and mechanical property measurements are reported for two Mn ductile irons with and without Co and three austempering treatments. It is shown that Co accelerates the stage I reaction in each of the irons and for each of the austempering treatments but has little affect on the stage II…
The paramagnetic complexes ( FPc )( Me ) Rh - (4) and (FPc)( PMe 3 )( Me ) Rh - (10) have been prepared by reducing ( FPc )( Me ) Rh (1) and ( FPc )( PMe 3 )( Me ) Rh (2) with NaBH 4 in methanol-d 4 [ FPc 2- = dianion of 1,4,8,11,15,18,22,25-octakis(trifluoromethyl)phthalocyanine]. Compounds 4 and 10 are further reduc…
The effect of synthesis conditions on the size and morphology of boehmite particles in the sol produced by hydrothermal processing has been investigated. Transmission electron microscopy, X-ray diffraction and Laser particle size analysis were used to characterise the synthesized boehmite. Results show that the initia…
Following the discovery of X-rays by Röntgen in 1895, three major fields of materials investigation and analysis developed. Röntgen already demonstrated the first of these--radiography--in his first publication. The second, X-ray emission spectroscopy, has its roots in the 1910s, but was rediscovered as X-ray fluoresc…
Abstract This paper considers the effective properties of cellular materials. The present approach and some earlier proposed methods are compared and discussed. The main effort is placed upon the continuum mechanics approaches' ability to predict effective elastic properties. It is shown that two methods are distinctl…
The impact of organic compounds on iodine volatility was investigated under a range of postaccident chemical conditions expected in a reactor containment structure. The rate of production of volatile iodine was evaluated in the presence of 10-3 M concentrations of carbonyl, alkyl halide, and aromatic compounds. A benc…
Ferroelectric domains of the tetragonal (Pb0.985Bi0.01)(Ni1/4Zn1/12Nb2/3)0.2(ZrσTi1−σ)0.8O3 (σ=0.30 and 0.40) ceramics were investigated by transmission electron microscopy and electron diffraction. It was observed that the 90° macrodomains displayed the shape of simple lamella twinning, and that the δ-fringe contrast…
The activity of inorganic substrates in the catalysed nucleation of polymer melts was studied using a nonisothermal differential scanning calorimetry technique (DSC). The analysis of the results was made by using the method developed by Dobreva-Veleva et al.1). In this method the kinetics of nonisothermal overall crys…
We have synthesized carbon chaplets in nanometer-scale size consisting of a nanotube bearing beads by catalytic thermal chemical vapor deposition. The catalyst is a patterned, layered thin film of iron and indium (Fe/In) that is coated indium tin oxide. The bushlike chaplets grow on both Fe/In-coated and Fe/In-uncoate…
Elastic fabrics used to make pressure garments are normally cut in various sizes and different aspect ratios ( i.e., width of fabric divided by gauge length). Because the aspect ratio may vary the load-strain relationships measured from the elastic fabric, the resultant pressure of a tubular elastic fabric exerted on…
An attenuated total reflectance (ATR) permeation cell has been used to evaluate the permeation of polymer samples from chemical protective clothing (CPC), mainly gloves, by several chemical types including a solvent, a commercial pesticide mix, and a volatile solid. Good contact between sample and ATR crystal was ensu…