Materials Literature
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The low-temperature phase and melting of a dilute, binary, two-dimensional array of colloidal particles with dipolar interactions are studied. The system consists of a 1% concentration of larger particles in an otherwise monodispersed array of polymer spheres confined between two glass plates. The translational and bo…
Initiation of the reaction between Na 3E (E = As, Sb, Bi) and anhydrous metal halides at 25 to 550 °C produces metal arsenides M x As y (M=Y,La, Ti, Hf, V, Nb, Ta, Cr, Mo, W, Mn, Fe, Co, Ni, Pt ,Cu and Zn) and antimonides M x Sb y (M=Ti, V, Nb, Ta, Cr, Fe, Co, Ni, Pt, Cu and Zn) via an exothermic selfpropagating react…
A new class of silicone matrix-based composites has been developed, particularly for use in the thermal protection of missile launch structures. In this application. screening tests have shown that these materials, coded SM8000, offer three-fold performance improvement over conventional phenolic-based composites. Init…
An electroplating process has been employed to grow high‐quality thin films of copper on tin oxide transparent semiconductor with excellent adhesion. It is shown that electrolysis reduction as a surface modification process prior to the electrodeposition is essential for good adhesion of the resulting copper coating.…
Soil solid phase and soil solution characteristics were evaluated on surface and subsoil horizons of 60 acid, highly weathered soils in the unamended state, and on a subset of 39 surface horizons following the addition of CaSO4.2H2O. The activity of Al3+ Was found to be strongly correlated with the soil solution pH, w…
Degradation of ethylene vinyl acetate copolymer (EVA; 28% VA content), low density polyethylene (LDPE) and their blends has been studied through thermogravimetric analysis (TGA/DTG). Pure EVA and its blends show a two stage decomposition, where the first stage is ascribed to the acetic acid elimination, i.e., the weig…
HVDC converter station operations generate radio frequency (RF) electromagnetic (EM) noise which could interfere with adjacent communication and computer equipment, and carrier system operations. A generic Radio Frequency Computer Analysis Program (RAFCAP) for calculating the EM noise generated by valve ignition of a…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTResonance Raman Characterization of Iron(III) Porphyrin N-Oxide: Evidence for an Fe-O-N Bridged StructureYasuhisa Mizutani, Yoshihito Watanabe, and Teizo KitagawaCite this: J. Am. Chem. Soc. 1994, 116, 8, 3439–3441Publication Date (Print):April 1, 1994Publication History Pub…
The peculiar reactivity of fluorine with graphite can be related to some characteristic parameters of this element. The competition between strong C-F bonds in covalent graphite fluorides and weak semi-ionic bonds in graphite intercalation compounds is pointed out. The different experimental routes for the intercalati…
The adhesion mechanism of electrolessly deposited Ni(P) on alumina ceramic substrates has been investigated. The adhesion was measured by direct pull-off tests and by 90° peel tests, which provided information on adhesion strength and fracture energy, respectively. An assessment is made of quantitative aspects of both…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructure and Spectroscopy of Sodalite Containing MnO4- IonsV. I. Srdanov, W. T. A. Harrison, T. E. Gier, G. D. Stucky, A. Popitsch, K. Gatterer, D. Markgraber, and H. P. FritzerCite this: J. Phys. Chem. 1994, 98, 17, 4673–4676Publication Date (Print):April 1, 1994Publicatio…
It has been reported previously that the mechanism for the erosion-corrosion of copper (Cu) in seawater is the removal of protective layers by hydrodynamic shear. This hypothesis was tested by studying the anodic dissolution of Cu in aerated 3.5 wt% sodium chloride (NaCl) solutions using a system designed to isolate t…
Knowledge of the electric field distribution can deepen the understanding of the flashover behaviour of outdoor insulators. The AC electric field under dry conditions and during rain has been measured along a post insulator with a field probe. Corona activity from the flange carries the potential towards the boundary…
Space charge formation in low-density polyethylene (LDPE) filled with zeolites and clays has been investigated by the thermally stimulated current method. The presence of fillers affects the dielectric properties due to additional dielectric relaxation phenomena, which depend on the structure of the inorganic filler.…
EPR signals of two defect centers in neutron-irradiated high-purity quartz have been analyzed. The principal values and the anisotropy of the g tensors suggest an attribution to peroxy radicals and nonbridging oxygen hole centers.
The main characteristics of a PZT ceramic, such as the piezoelectric charge coefficient or the permittivity, may change drastically when the ceramic undergoes a high uniaxial stress along its polar axis in the 10 to 150 MPa range. A special device has been built to measure accurately and directly the d33 and ϵT 33 par…
Mixtures of alumina and silica containing 68–78 wt% alumina react above 600°C with 0.5 mol of SiF 4 per mole of alumina to form fluorotopaz. High‐resolution X‐ray powder diffraction data were used to determine very accurate cell parameters of fluorotopaz as a function of 1 wt% compositional increments. The samples con…
Abstract The synthesis and thermal properties of a new type of side‐chain liquid‐crystalline polysalts are described. The polymers are first obtained by partial or complete alkylation of a linear poly(ethyleneimine) with 6‐(4‐methoxy‐4′‐biphenylyloxy)hexyl bromide or 12‐(4‐methoxy‐4′‐biphenylyloxy)dodecyl bromide. In…
We present experimental results on the study of the length dependence of molecular second-order nonlinear optical responses based on a new class of heteroaromatic compounds. We observed a power-law dependence of the second-order molecular susceptibility on the length of the molecule with an exponent of 2. The exponent…
This paper presents results of the Monte Carlo simulation of dense melts of symmetric diblock copolymer rings using the cooperative motion algorithm. Due to topological constraints, i.e., the entire absence of entanglements prevents the self-avoiding ring melts from adopting Gaussian statistics, and the scaling expone…