Materials Literature
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All articles of this category A variety of N -heteroaromatic compounds were converted into their corresponding N -oxides with good yields and with high chemoselectivity in the presence of hydrogen peroxide as oxygen donor and a catalytic amount of Mn-porphyrin. The scope and limitation of this method are discussed. he…
The shear orientation of a nematic side-group liquid crystalline polymer (SG-LCP) with side-on fixed mesogenic units was investigated by means of rheo-birefringence and rheo-small angle light scattering. Rheological properties of the polymer depend on molecular weight. Macroscopically aligned samples were obtained in…
We succeed in preparing anisotropic magnetic powders with high performance based on the NdFe10.5Mo1.5Nx nitrides. The properties of these materials are favorable for permanent magnet application. The domain structures of the NdFe10.5Mo1.5 and NdFe10.5Mo1.5Nx were studied by using magnetic force microscopy. Upon nitrog…
Relatively recent failures in seawater systems of highly alloyed (i.e., pitting resistance equivalent [PREN] > 40) stainless steels (SS) have highlighted the issue of corrosion testing and safe-use limits. Three aspects of testing and selection of SS for seawater application were reviewed: relevancy of the elec…
The local phenomenology associated with membrane fouling has been investigated experimentally at laboratory scale for the crossflow microfiltration (CMF) of beer. Two downstream membrane processes were involved: clarification and sterilisation of beer. Fouling mechanisms were interpreted and compared for two types of…
Single crystals of ${\mathrm{LaCl}}_{3}{:1%\mathrm{}\mathrm{Er}}^{3+}$ were grown by the Bridgman technique. ${\mathrm{Er}}^{3+}$ substitutes for ${\mathrm{La}}^{3+}$ and has a site symmetry of ${C}_{3h}$ in ${\mathrm{LaCl}}_{3}.$ Seventy-three energy levels of ${\mathrm{Er}}^{3+}$ were determined up to $45000{\mathrm…
Abstract A conductive plastic was compounded in a twin screw extruder by incorporating conductive carbon fiber (CF) into an acrylonitrile‐butadience‐styrene (ABS) copolymer. The effects of various processing parameters prior to injection molding were investigated; then, the electromagnetic interference shielding effec…
Dodacanethiol-capped silver “quantum dot” particles (Q-particles) have been synthesized using a novel biphasic microemulsion (Winsor II type) of diethyl ether/AOT/water. FT-IR investigations and elemental analyses support the encapsulation of silver particles by dodecanethiol while the transmission electron micrograph…
The mechanical behavior of MoSi 2 reinforced–Si 3 N 4 matrix composites was investigated as a function of MoSi 2 phase content, MoSi 2 phase size, and amount of MgO densification aid for the Si 3 N 4 phase. Coarse‐phase MoSi 2 ‐Si 3 N 4 composites exhibited higher room‐temperature fracture toughness than fine‐phase co…
Abstract Hydrogen-forms of <2 µm fractions of six bentonites of various Fe contents were prepared by H + →OH - →H + ion exchange using resins. Potentiometric titration curves revealed that the number of strong acid sites varied and accounted for 60-95% of the total acidity in the freshly prepared H-forms. The numbe…
An expression for the bond energy between two chemical species, A and B, in terms of the chemical potentials, the hardnesses, and the condensed Fukui functions of the isolated species, and the hardness of the system AB at equilibrium, is derived by dividing the total interaction energy into two contributions, one that…
There are few studies about K status and K exchange equilibrium for Vertisols of southwestern Spain, and the K requirements for crop production in this region are not well defined. Moreover, there is no information on the relationship between the kinetics of K release and plant K uptake for these soils. The objectives…
An intimate Ba‐Al‐Al 2 O 3 ‐SiO 2 powder mixture, produced by high‐energy milling, was pressed to 3 mm thick cylinders (10 mm diameter) and hexagonal plates (6 mm edge‐to‐edge width). Heat treatments conducted from 300° to 1650°C in pure oxygen or air were used to transform these solid‐metal/oxide precursors into BaAl…
Using frequency and temperature-dependent conductivity data for $x$ $\mathrm{AgI}\ensuremath{\cdot}(1\ensuremath{-}x)$ ${\mathrm{AgPO}}_{3}$ glasses in the composition range from $x=0.10$ to $x=0.55,$ we find that the number density of mobile ions as well as the ionic relaxation mechanism are independent of temperatur…
The non-phosphorylating glyceraldehyde-3-phosphate dehydrogenase catalyses the irreversible reaction of glyceraldehyde-3-phosphate to 3-phosphoglycerate by the reduction of NADP to NADPH. This is in contrast to the extensively analysed phosphorylating glyceraldehyde-3-phosphate dehydrogenases which catalyse the revers…
We report the synthesis, the physicochemical characterization, and biological evaluation of a new caged glutamate, N-(o-nitromandelyl)oxycarbonyl-L-glutamic acid (Nmoc-Glu), that liberates free glutamate on photolysis. The low affinity of certain glutamate receptors and their rapid entry into desensitization have effe…
Polyarylmethyl high-spin polyradicals are designed to possess a structure corresponding to simple spin clusters, where component spins ( S ‘) arise from strong ferromagnetic coupling through 1,3-phenylene units and weak ferromagnetic spin coupling between the component spins is mediated via 3,4‘-biphenylene (or 3,5,4‘…
Thermal degradation of poly(aryl-ether-ether-ketone) (PEEK) was investigated using stepwise pyrolysis/gas chromatography/mass spectrometry (Py/GC/MS) by consecutively heating the sample at fixed temperature intervals to achieve narrow temperature pyrolysis conditions. The individual mass chromatograms of the various p…
The electrochemical behavior of (TPPBr x )Co (TPPBr x = the dianion of β-brominated-pyrrole tetraphenylporphyrin and x = 0−8) is reported under an N 2 or a CO atmosphere in dichloromethane containing tetra- n -butylammonium hexafluorophosphate as supporting electrolyte. Each investigated compound undergoes three rever…
Abstract For the purpose of clay examination, a new one-step method for the removal of organic matter was developed using sodium peroxodisulphate combined with different buffers such as sodium hydrogen carbonate, disodium hydrogen phosphate and disodium tetraborate. From an early Cretaceous black shale from the Apenni…