Materials Literature
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Abstract A change in color and density during prolonged heating of a formulation containing ε‐hexanitrohexaazaisowurtzitane (HNIW) and Estane 5702 was investigated by Fourier transform infrared (FTIR) spectroscopic analysis. Starting materials, virgin and final colored formulation were studied. Analysis revealed polym…
The XPS spectra of materials containing both magnesium and aluminum can exhibit a number of spectral artifacts when using a Mg Kα x-ray source. These artifacts are easily observed in XPS spectra of magnesium aluminate (MgAl2O4, also known as magnesium aluminum oxide), which are presented in this article. For example,…
Abstract The dynamics of R‐11 blown polyurethane foam formation depend on the rates of viscosity increase of the reacting mixture and R‐11 evaporation, and both are controlled by the polymerization process. Detailed experiments were carried out to study the dynamics of foaming and the measurements made included the cr…
An electromigration failure model which can be used to project the electromigration lifetime under pulsed DC and AC current stressing has been reported. The experimental results indicate that different metallization systems (Al-2%Si, Al4%Cu/TiW, and Cu) show similar failure behaviors, which can be explained and predic…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEffects of Calcium and Magnesium Ions on Aggregation of Whey Protein Isolate and Its Effect on Foaming PropertiesHaiming Zhu and Srinivasan DamodaranCite this: J. Agric. Food Chem. 1994, 42, 4, 856–862Publication Date (Print):April 1, 1994Publication History Published online…
BaTiO 3 single crystals were prepared by solid‐state grain growth. The single crystals were obtained by seeding a poly‐crystalline, TiO 2 ‐excess BaTiO 3 , which exhibited abnormal grain growth. The condition for single‐crystal growth was essentially dependent on the grain growth behavior of the polycrystalline, sinte…
Attempts to prepare hydrogen-bond-directed nonlinear optical materials from a 1:1 molar mixture Of D-(+)-dibenzoyltartaric acid (DBT, I) and 4-aminopyridine (4-AP, II) resulted in two salts of different stoichiometry. One of them crystallizes in an unusual 1.5:1 (acid:base) monohydrate salt form III while the other on…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTChain Reorientation in Poly(tetrafluoroethylene) by Mobile Twin-Helix Reversal DefectsM. Kimmig, G. Strobl, and B. StuehnCite this: Macromolecules 1994, 27, 9, 2481–2495Publication Date (Print):April 1, 1994Publication History Published online1 May 2002Published inissue 1 Ap…
This article presents the main core lines and the valence band x-ray photoelectron (XPS) spectra obtained for a commercial gamma-alumina (γ-Al2O3) powder. The electronic record includes the Al 2p, Al 2s, O 1s, O 2s, C 1s, and valence band spectra. Although it is usually difficult to distinguish among the various forms…
Supercooled m-tricresyl phosphate has been studied by different nuclear magnetic resonance (NMR) methods using the 31P spin probe (180–400 K). Combining measurements of the spin-lattice relaxation at two Larmor frequencies, of the line shape and of the stimulated echo decay, a reorientational correlation function F2(t…
Extensive interlamellar spacing measurements on directionally solidified Al–CuAl2 eutectic alloys show that in this system the eutectic exhibits a limited range of spacings rather than a unique spacing during steady state growth at a constant velocity. The minimum spacing observed corresponds to the extremum spacing p…
The D-glucose/D-galactose-binding protein (M(r) = 33,000) found in the periplasm of bacterial cells serves as the primary high-affinity receptor of active transport for and chemotaxis toward both sugar epimers. This protein from Escherichia coli binds D-glucose with a Kd of 2 x 10(-7) M, which is about 2 times tighter…
The connective tissue of the skin is composed mostly of collagen and elastin. Collagen makes up 70-80% of the dry weight of the skin and gives the dermis its mechanical and structural integrity. Elastin is a minor component of the dermis, but it has an important function in providing the elasticity of the skin. During…
XPS data have been obtained from a pressed Ag2O powder obtained from AESAR. The Ag2O sample was annealed in vacuum at 300°C for 30 min. This resulted in a surface primarily composed of Ag2O with a small amount of Ag metal present also. The anneal temperature is above that which results in the decomposition of AgO to A…
The effect of grain boundaries on the electrical resistivity of bulk nickel with a nanocrystalline structure has been investigated. For this study, nanocrystalline nickel was produced using a pulse plating technique that yields equiaxed nanostructures with negligible porosity. Using the four probe technique, resistivi…
Zinc aluminate (ZnAl4O4, also known as zinc aluminum oxide) is a material that has applications as a catalyst and catalyst support. This paper presents the XPS spectra of the major Zn, Al, and O photoelectron lines, and the major x-ray induced Zn LMM Auger lines for ZnAl2O4.
Densely packed monolayers of spherical polymer particles are expected to show interesting materials properties, e.g. a high permeability. It is demonstrated that relatively close‐packed Langmuir films of monodisperse 0.5 μm particles—with a hydrophilic shell and hydrophobic core—can be formed at the air‐water interfac…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLewis Acid-Assisted Anionic Ring-Opening Polymerization of Epoxide by the Aluminum Complexes of Porphyrin, Phthalocyanine, Tetraazaannulene, and Schiff Base as InitiatorsHiroshi Sugimoto, Chikara Kawamura, Masakatsu Kuroki, Takuzo Aida, and Shohei InoueCite this: Macromolecu…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEnsheathing a Polyoxometalate: Convenient Systematic Introduction of Organoimido Ligands at Terminal Oxo Sites in [Mo6O19]2-Joseph B. Strong, Robert Ostrander, Arnold L. Rheingold, and Eric A. MaattaCite this: J. Am. Chem. Soc. 1994, 116, 8, 3601–3602Publication Date (Print)…
For antitumor agents introduced directly into the intracranial space, the extent of penetration into tissue, and hence the effectiveness of therapy, depends on the rate of drug elimination from the tissue. To test the hypothesis that slowly eliminated agents would penetrate further through tissues, methotrexate (MTX)-…