Materials Literature
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A mean-field theory is developed for a calculation of the surface free energy of the staggered body-centered solid-on-solid (or six vertex) model as function of the surface orientation and temperature. The model approximately describes surfaces of crystals with nearest neighbor attractions, and next nearest neighbor r…
Structure factors for strontium/chromium- (Sr/Cr) and barium- (Ba) doped potassium titanyl phosphate (KTiOPO(4), KTP) were measured with focused synchrotron X-radiation [0.75000 (9) A] using a fast avalanche photodiode counter. Space group Pna2(1), Z = 8, a = 12.786 (2), b = 6.3927 (8), c = 10.5585 (9) A, T = 293 (1)…
Crystals of compound (I) and (II) are black in reflected light and brown‐ black in transmitted light. The 1H-nmr of the cations of (I), recorded in D6-DMSO, show peaks, relative to the 1H of D6-DMSO, at + 0.46 ppm(rel. int. = 3); + 0.85 ppm(rel. int. = 1.2); + 1.80 ppm (rel. int. = 3); and −4.18 ppm(rel. int. = 1). Th…
Polymer nanocomposites were prepared by mixing ultrahigh-molecular-weight polyethylene and gold colloids coated with a self-assembled monolayer of dode-canethiol. Subsequently, these materials were oriented by solid state drawing which induced the formation of uniaxially oriented arrays of gold particles. As a result…
EPDM sponge rubber profiles for automotive industry are becoming increasingly complex. As there is still little knowledge and process understanding, extensive investigations have been done at the Institute of Plastics Processing to describe the influence of the rheological material properties, the compound components…
Intumescent coatings make the most efficient way of fire retarding of flammable materials. The coatings swell under the influence of heat and form a thick porous charred layer. The latter perfectly insulates a substrate against excessive increase of temperature and oxygen access. In order to make intumescent coatings…
Composites made from a stryrene/unsaturated polyester thermoset matrix and woodflours from different wood species have been prepared and tested. Pine (Pino Eliottis), eucaliptus (Eucaliptus Saligna) and marmelero (Ruprechia Laxiflora), a softwood and two semihard woods respectively, were selected for this study becaus…
The dependence of the absorption coefficient α on photon energy hνwas determined in the spectral range from 1.1 to 3.9 eV at room temperature,for evaporated Gex Te100-x films. The variation of the optical gap Egopt ,dielectric constant ε ,and absorption coefficient,α with composition andannealing are reported. The opt…
The properties of Pb 5 Ge 3 O 11 : Cu 2+ crystals near the temperature of the ferroelectric phase transition are discussed in terms of a phenomenological approach. Assuming a quadratic interaction with the order parameter, the effect of Cu 2+ is considered a result of static distortions, which result from the off-cent…
Magnetic susceptibility of the La 0.9 MnO 3 single crystal was measured and its ( 139 La, 55 Mn) NMR spectra were recorded. The data obtained indicate that the areas with an A-type antiferromagnetic order ( T N =140 K) and magnetic moments aligned with the b axis occupy a major part of the sample volume in manganite w…
Abstract In this paper a method is described for using economic optimization in the design of baghouse systems. That is, for a given emission control problem, the total filtration surface area, the overall pressure drop, fabric material effects, and the cleaning cycle frequency, may all be evaluated simultaneously. In…
The decomposition of N 2 O into N 2 , O 2 , and NO was studied in a fast discharge flow of N 2 O/He or N 2 O/Ar mixtures. The decomposition efficiency of N 2 O into N 2 and O 2 in N 2 O/Ar mixtures was higher than that in N 2 O/He mixtures, and 99% of N 2 O could be decomposed into N 2 and O 2 at a low N 2 O flow rate…
The antitumor efficacy of the conjugate of doxorubicin (DXR) and carboxymethylpullulan (CMPul) with Phe-Gly spacer (CMPul-FG-DXR) was evaluated using murine tumor models and compared with that of DXR. The conjugate exhibited higher antitumor efficacy against Lewis lung carcinoma than DXR. Complete tumor regression fol…
The stability as well as the electrical properties of both unirradiatedand γ-irradiated poly(vinyl alcohol)-PVA films doped with MnSO4.H2O at adefinite concentration of 15% have been studied. The dielectric loss tangent tanδ, electrical conductivity σ and dielectric constant ε’ in the frequency range100 Hz-20 KHz were…
A comparative study of different carbon materials (C60 fullerene; soot, both with and without fullerenes; graphite; and industrial carbon black) as additives to industrial lubricating oils has been carried out for copper-steel and steel-steel sliding couples. The soot containing fullerene and the powder of pure fuller…
Vayrynenite, (Mn2+0.78Fe2+0.23Mg0.01)Be(PO4)(OH0.92F0.08), is monoclinic, a 5.4044(6), b 14.5145(12), c 4.7052(6) A, β 102.798(9)°, V 359.91(7) A3, space group P 21/ a , Z = 4. The structure was refined to an R index of 1.5% based on 1001 observed [| F o| > 5σ F ] for reflections measured with Mo K α X-radiation using…
Abstract The single-crystal X-ray structure of tungstenian wulfenite- I 4 1 / a containing 10 mol.% WO 3 from the San Francisco mine, Sonora, Mexico, space group I 4 1 / a , a = 5.436(2), c = 12.068(8)Å and Z = 4, has been refined to R = 0.052. The Mo and W are disordered over special position 4 a (0,0,0) in the latti…
The anharmonic effective pair potentials V ( u )= a u 2 /2+ b u 3 /3!+ c u 4 /4! for Br–Cu bond in γ- and α-CuBr under pressure have been investigated by an extended X-ray absorption fine structure (EXAFS) technique. The EXAFS spectra near the Br K-edge were measured under high temperature and high pressure using a la…
Acidization is one of the most important techniques to increase the productivity of crude petroleum oil and gas wells. The effective way for protecting these oil well tubular materials is by using corrosion inhibitors during the acidization process. The present study deals with the evaluation of inhibition effect of e…
A cost efficient manufacturing route for ceramic matrix composites (CMC) has been developed by DLR. Starting with a carbon fibre reinforced plastic composite and converting the matrix from carbon to silicon carbide via the reaction with liquid silicon, CMC materials of high mass specific properties and of excellent th…