Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDiffusion-controlled reactions on porous silicas: mechanisms, surface diffusion coefficients, and effects of geometryJoshua Samuel, Michael Ottolenghi, and David AvnirCite this: J. Phys. Chem. 1992, 96, 15, 6398–6405Publication Date (Print):July 1, 1992Publication History Pu…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMolecular microstructure of the ethyl branch segments in poly(vinyl chloride)W. H. Starnes Jr., B. J. Wojciechowski, A. Velazquez, and G. M. BenediktCite this: Macromolecules 1992, 25, 14, 3638–3641Publication Date (Print):July 1, 1992Publication History Published online1 Ma…
Present methods of determining the safe injected charge levels for disk-type electrodes are given in terms of an average charge density, although the charge density is higher near the periphery of the electrode. This paper describes an electrode that produces an injected charge density that is uniform over the surface…
The {100} platelets of a type IaA/B diamond have been examined by spatially resolved electron-energy-loss spectroscopy. It is demonstrated unambiguously that nitrogen is present at these planar defects but in low concentrations. A quantitative analysis of the data reveals that the atomic density of the nitrogen is 0·2…
Reaction-sintered β-SiC specimens were neutron-irradiated in fast breeder reactors to fluences from 3.0×1024 to 1.7×1027 n/m2 (E>0.1 MeV) at temperatures from 370 to 620°C. Irradiation to fluences above 4.8×1026 n/m2 caused swelling (growth) that was significantly greater in respect of macroscopic dimension than of la…
Abstract— Single‐pitted specimens of an HSLA steel, were tested in laboratory air and in 1 M NaCl solution to study the influence of a corrosive environment on its fatigue life. The growth of fatigue cracks and the partitioning of the fatigue life into fatigue crack initiation and fatigue crack propagation were studie…
Oxygen diffusion induced phenomena in copper oxide thin films have been studied by a combination of the 16O(α, α)16O oxygen resonance technique and the transmission electron microscopy (TEM), which provides a method for studing the kinetics of nucleation and growth of the Cu2O phase in the CuO matrix. A discontinuous…
It was hypothesized that an orientated cellular tissue for incorporation into vital, functioning hybrid artificial organs can be prepared by periodically applying mechanical stresses on a hybrid tissue. Therefore, the effect of cyclic stretching on the two-dimensional (2-D) orientation response of arterial smooth musc…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEffect of carbon dioxide on the activation energy for methyl radical generation over lithium/magnesia catalystsMingting Xu, Chunlei Shi, Xuemin Yang, Michael P. Rosynek, and Jack H. LunsfordCite this: J. Phys. Chem. 1992, 96, 15, 6395–6398Publication Date (Print):July 1, 199…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPerovskone: a triterpene with a novel carbon skeleton from Perovskia abrotanoidesAslam Parvez, M. Iqbal Choudhary, Farzana Akhter, Mushtaq Noorwala, Faryal V. Mohammad, Naim M. Hasan, Talat Zamir, and Viqar Uddin AhmadCite this: J. Org. Chem. 1992, 57, 16, 4339–4340Publicati…
Glutamate racemase of Pediococcus pentosaceus contained no cofactor, and was completely inactivated by a thiol reagent. The role of a cysteine residue in the enzyme reaction was studied by chemical modification. The modification of this cysteine residue resulted in a concomitant loss of activity. DL-Glutamate protecte…
Abstract Dynamic mechanical thermal analysis (DMTA), differential scanning calorimetry (DSC), and scanning electron microscopy (SEM) concurrently show that polycarbonate (PC)/poly(methyl methacrylate) (PMMA) blends have a two‐phase structure. The differences between the T g s of parent polymers and the T g s of conjug…
After showing that india (In 2 O 3 ) resisted high‐temperature reaction with SO 3 /Na 2 SO 4 and vanadate melts, we prepared india‐stabilized zirconia (ISZ) by a proprietary sol–gel process, and tested the material for corrosion resistance to 700–900°C molten vanadates. ISZ was superior to yttria‐stabilized zirconia (…
Recent studies obtaining the anisotropic complex dielectric spectra of oriented metal-free phthalocyanine (H2Pc) films with variable angle spectroscopic ellipsometry (VASE) have been extended to similarly oriented copper phthalocyanine (CuPc) thin films. The CuPc films were vacuum vapor deposited onto sputter deposite…
Abstract The ability to evaluate various mechanical test parameters of polymers using an instrumented impact tester is reviewed. The nature of the short chain branching (SCB) in a series of linear low density polyethylenes (LLDPE) was characterized and related to several impact test parameters for these materials. The…
AES, XPS, TDS and LEED have been used to study the interactions of F, H and CH x species with the diamond C(111)-(2 × 1) surface. It is found that a small quantity of chemisorbed H atoms can induce the (2 × 1) to (1 × 1) phase transformation and uphold the sp3 structure to nearly 1400K. In contrast, F atoms and CH x s…
Thin films of both chloroindium and copper pthalocyanines have been vacuum deposited onto metal dichalcogenide surfaces such as MoS2 and SnS2, with ordering achieved for these four-fold symmetric molecules ranging from below monolayer to multilayers. Reflection high-energy electron diffraction suggests that square lat…
PURPOSE: To assess the degree and regional pattern of first-pass brain enhancement using dynamic MR imaging. MATERIALS AND METHODS: Ultrafast MR imaging (1.06-second acquisition time per image) was performed in 19 healthy subjects following a bolus IV injection of a gadolinium contrast agent; 36 patients with suspecte…
Corrosion layers grown on stainless steels (AISI 302, 316), polarized at the pitting potential in alkaline solutions containing chloride, were identified by Raman spectroscopy. Several binary alloys such as Fe-10Ni, Fe-6Mo, and Fe-18Cr, were studied to separate the influence of the different alloy elements. A comparis…
The second and third virial coefficients are estimated for a semidilute suspension of macromolecular rods interacting by van der Waals forces. Whenever the attractive interaction becomes strong enough to be noticeable, it is no longer quantitatively correct to adopt a second virial approximation. Nevertheless, the sta…