Materials Literature
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Mixed atomistic and continuum methods offer the possibility of carrying out simulations of material properties at both larger length scales and longer times than direct atomistic calculations. The quasi-continuum method links atomistic and continuum models through the device of the finite element method which permits…
Differential scanning calorimetry (DSC) is one of the most widely used technique for measuring crystallinity in the polymer industry. The major source of error in the crystalline index (CIDSC) of low crystallinity polymeric articles, is the development of further crystallinity during the DSC scan. Although, this type…
Abstract Based on a multiple reflection model, the concentration depth profiles of gold diffused into a silver substrate are determined. To conclude the structure of the sample from the measured intensity of radiation, an accurate correction procedure is necessary. A new model was developed for this purpose. Since the…
A theoretical interpretation of the fine structure of the secondary-electron emission spectra and the secondary-electron emission coefficient is given for molybdenum. The calculations are carried out with allowance for the energy dependence of the energy-band broadening, the electron-electron and electron-plasmon cont…
Cette etude porte sur l'effet des hautes pressions sur la corrosion saline sous contraintes a haute temperature du titane (IMI834), sous chargement statique (580MPa) et en fatigue (0.1-580MPa). Des pressions de 1 bar et 16 bar ont ete etudiees, avec une densite saline de 0.032 mgcm -2 . L'influence de paliers a charge…
We present an inelastic neutron scattering study of the relationship between lattice dynamics and the phase transition sequence for the proper ferroelectric Sn2P2Se6, which demonstrates a type II incommensurate phase. The dynamics in the phase transition sequence paraelectric-incommensurate-ferroelectric shows the fol…
A new technique for transmission electron microscope (TEM) observation of grown-in defects has been developed. The grown-in defects beneath the surface, at the “origin of crystal originated particles (COPs)”, are detected using a laser particle counter combined with an atomic force microscope (AFM). Subsequently, the…
The oxides A 2 B 2 O 7 and A 2 B 2 O 6 with the pyrochlore structure and nonferroelectric phase transitions are suitable materials for capacitors. Their behavior, including their dielectric behavior, can be explained on the assumption that they are improper antiferroelectrics. An approximate calculation gives a reason…
Complexes of yttrium (III) and lanthanide(III) ions with an axial macrobicycle derived from the 2+3 Schiff-base condensation of tris(2-aminoethyl)amine with 2,6-diformylpyridine have been prepared in high yields using a one-step procedure. The complexes, with formula [M 2 L](NO 3 ) 6 · xH 2 O · ySolv, (M = Y, La - Lu,…
Polyamides (4a-b and 5a-b) were synthesized from interfacial polycondensation of novel diamine containing phosphatidylcholine analogous moiety, hexamethylene diamine with adipoyl chloride, or sebacoyl chloride in the interface of water and carbon tetrachloride at room temperature. The characterizations of synthesized…
Long‐term potassium (K) fertilization practices are likely to affect the K content of soils. This study assessed the effect of long‐term K fertilization strategies for corn (Zea mays L.) and soybean [Glycine max (L.) Merr.] rotations on extractable K in the soil profile of a major Iowa soil type at two locations. The…
The state and the elastic dilatational properties of a mixed spiropyran (with attached hydrocarbon)−octadecanol (1:5, mol/mol) spread monolayer was studied. A localized photochemical excitation was used to generate dilatational motion along the elastic monolayer. The surface pressure variations at various distances fr…
SmI2-catalyzed polyaddition of 1,12-dodecanedial followed by treatment with benzaldehyde gives a polyester (1) containing three structural units, [OCH2-(CH2)10-CH2O], [OCH2-(CH2)10-CO], and [CO-(CH2)10-CO], in the main chain and an OCH2Ph end-capping group. GPC analysis of 1 shows molecular weights of Mn = 5.5 × 103 a…
Conformal optical elements offer the promise of enhanced aircraft and missile performance, as well as the potential of improved commercial applications such as microlithography and precision illumination. To turn potential into reality, a number of technical issues must be understood and solved in the areas of optical…
Abstract We give here a model for the pressure dependent, biaxial mechanical behavior of glassy polymers based on the thermally activated growth of deformation zones (Somigliana dislocation loops). The Coulomb criterion of plasticity, σ c = S − m σ n , is found as the critical threshold needed to propagate Somigliana…
A variety of plasma etching chemistries were examined for patterning NiMnSb Heusler alloy thin films and associated barrier layers. Chemistries based on , and were all found to provide faster etch rates than pure Ar sputtering. In all cases the etch rates were strongly dependent on both the ion flux and ion energy. Se…
Two new layered compounds, Pb2BaCuFeO5X (X = Cl, Br), have been prepared by a solid-state reaction. The structure of these compounds is an intergrowth of a defective perovskite BaCuFeO5 block unit and a cesium chloride type Pb2X layer. The structure is related to that of the mineral hematophanite by removing the centr…
Mineral crystals with specific surface texture have been grown by a templating mechanism from a lyotropic liquid-crystalline phase. This experimental system is important in understanding mineralization in ordered organic media, a phenomenon of importance in biology and possibly in biomaterials technology as well. The…
A simplified method for planarizing liquid-crystal-on-silicon (LCOS) backplanes is presented. The method relies on the planarizing capability of spin-cast benzocyclobutene (BCB) polymeric resin. BCB planarization shows a sixfold reduction in step height on the surface of a typical LCOS backplane. Contact with the unde…
Nanoporous Si layers have been investigated by photoacoustic (PA) spectroscopy. The optical absorption spectra for porous Si on p-type Si substrates were obtained in the region of 300 to 1500 nm. The absorptivity became remarkable at 600 nm and increased drastically up to the saturation value while the wavelength decr…