Materials Literature
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Abstract Today, material science is directed towards the development of multifunctional and oriented structures. One example of such supramolecular systems are liquid crystalline (LC) elastomers which combine the properties of LC phases (the combination order and mobility) with rubber elasticity, one of the most typic…
This paper explains how the convergent beam electron diffraction (CBED) and large angle convergent beam (LACBED) techniques can be used to study crystal defects, bicrystals, and multilayers. It is shown how the LACBED technique in particular can be used to derive the magnitude and sign of the Burgers vectors of disloc…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHigh-pressure NMR kinetics. Part 41. Dissociative substitution in four-coordinate planar platinum(II) complexes as evidenced by variable-pressure high-resolution proton NMR magnetization transfer experimentsUrban Frey, Lothar Helm, Andre E. Merbach, and Raffaello RomeoCite t…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe life and times of [Ru(bpy)3]2+: localized orbitals and other strange occurrencesM. Keith De Armond and Michael L. MyrickCite this: Acc. Chem. Res. 1989, 22, 10, 364–370Publication Date (Print):October 1, 1989Publication History Published online1 May 2002Published inissue…
A neutron-scattering measurement was performed on pure amorphous Si. The radial distribution function was derived from the wide momentum-transfer range spectra. These data are compared to theoretical models in the 0--10-A\r{} real-space interval.
A new method is proposed for the determination of anharmonic interatomic potentials of fcc metals (Cu, Pd, Ag and Au) and metal halides (AgBr and CuBr). Structural parameters given by the temperature-dependent EXAFS (extended X-ray absorption fine structure) analysis allow us to estimate an interatomic potential if a…
Interfacial shear strength and interfacial sliding friction stress were assessed in unidirectional SiC‐filament‐reinforced reaction‐bonded silicon nitride (RBSN) and borosilicate glass composites and 0/90 cross‐ply reinforced borosilicate glass composite using a fiber pushout test technique. The interface debonding lo…
The steady-state catalytic oxidation process of carbon monoxide on platinum metal surfaces is studied using two irreversible kinetic computer simulation models: (a) An extended version of the model introduced by Ziff, Gulari, and Barshad (ZGB) with the effects of CO desorption and diffusion as well as finite reaction…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThermotropic liquid crystals of polyesters having a mesogenic p,p'-bibenzoate unit. 2. X-ray study on smectic mesophase structures of BB-5 and BB-6Junji Watanabe and Manabu HayashiCite this: Macromolecules 1989, 22, 10, 4083–4088Publication Date (Print):October 1, 1989Public…
We present a novel method of preparing highly efficient and stable second-order nonlinear optical (NLO) polymers via chemical cross-linking induced vitrification under electric field. In this method a soluble prepolymer is first prepared that contains cross-linking sites attached to the NLO-active groups. Upon prepari…
Characterization of an existing sample of cenospheres produced during residual-oil-fired steam power plant combustion included: scanning electron microscopy of surface structure; photomicrography of particle cross sections; measurement of porosity, surface area, and density; and measurement of chemical composition. Th…
Certain organic vapors induce a morphological transformation in 1,4-dithioketo-3,6-dipheyl-pyrrolo-[3,4-c]-pyrrole (DTPP) which is accompanied by enhanced absorption and photoconduction in the near infrared. In order to gain more insight into this phenomenon, intermolecular charge transfer caused by the vapor treatmen…
Single crystals of yttria-stabilized zirconia (12 mol % of ${\mathrm{Y}}_{2}$${\mathrm{O}}_{3}$) have been x-ray irradiated at room temperature. The electron paramagnetic resonance spectrum of the filled electron traps is analyzed in terms of a single oxygen vacancy type of defect with its symmetry axis along the 〈111…
Measurements of heat transfer during melting and solidfkation of n-eicosane and rt-hexadecane were performed in vertical cylinders with two different lengths and diameters. Radial temperature distibutions were measured with lime at different heights in all the tests. To evaluate the rate of heat charged and discharged…
Describes some recent studies of adsorbate interactions at oxide surfaces using photo-emission, surface EXAFS and NEXAFS which illustrate the potential of the techniques to provide structural and mechanistic information. The examples chosen are a SEXAFS study of the NiO(100)-H 2 S reaction, which results in reduction…
With the help of selective etchants as-grown domain structure arising as a result of the phase transition and its restruction in electric field is investigated in lead germanate single crystals. It is shown that this structure consists of small counter domains which are enlarged in electric field. By the use of strobo…
Abstract X-Ray powder diffraction and thin section analyses indicate that marginal lacustrine mudstones of the Green River Formation in the south-central Uinta basin, Utah, contain abundant analcime. The analcime has a low Si/Al ratio (<2.31) and occurs as very fine grained disseminated crystals and, to a lesser ex…
Favorable passive reactivity shutdown performance in response to unprotected accident initiators has been shown to be achievable when several measurable, integral reactivity parameters related to the power, flow, and inlet temperature coefficients of reactivity satisfy certain simple constraints among their dimensionl…
The corrosion behavior of 13Cr-martensitic stainless steel was investigated in CO2-H2S-Cl− environments typical of oil and gas wells under different CO2 and H2S partial pressures, with an NaCl content of 50 g/L, pH = 2.7 and 4.8, T = 80°C. The 13Cr was highly corrosion resistant to CO2-induced phenomena (general corro…
The in-frame fusion between two oligomeric enzymes, beta-galactosidase and galactose dehydrogenase, is described. The lacZ gene was fused to the 3' end of the galdh gene with a linker encoding only three amino acids. The purified artificial bifunctional enzyme displayed the enzymic activity of both gene products. The…