Materials Literature
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Abstract Film samples of two very pure polyolefins, low‐density polyethylene (LDPE) and biaxially oriented polypropylene (BOPP), were surface‐modified by vacuum ultraviolet (VUV) photochemistry in low‐pressure ammonia. The influence of experimental conditions such as wavelength and intensity (photon flux) of the VUV r…
Abstract A series of bismaleimide and biscitraconimide compounds with ester units were synthesized by a condensation reaction between 3‐maleimido benzoic acid chloride or 4‐maleimido benzoic acid chloride and citraconimido benzoyl chloride with 4,4‐(hexafluoroisopropylidene)diphenol and 4,4‐hydroxyphenylsulfone. The m…
If the presence of crystal surfaces permits some of the dipole content of a dislocation array to leave the crystal to form intrusions or extrusions on the surface, then the dipole strength of the array, as defined in part I, can change by glide processes. It is confirmed that the energy difference between vacancy and…
The recently determined structure of NaCa(4)Nb(5)O(17) is reanalyzed within the superspace framework. The material follows the general features of the superspace model proposed for the perovskite-related compounds of the general formula A(n)B(n)O(3n+2) [Elcoro et al. (2001). Acta Cryst. B57, 471-484]. It can be descri…
Toxic elements found in wastes may have a negative impact on the environment, especially through the contamination of groundwater and plants. To reduce their mobility and availability, French regulations mandate the solidification and stabilization of toxic wastes. Many methods to stabilize and solidify wastes exist,…
Pure lead phosphate, Pb(3)(PO(4))(2), undergoes a phase transition from C2/c to R(-)3m symmetry at a pressure of approximately 1.8 GPa and room temperature. Single-crystal X-ray diffraction measurements of the unit-cell parameters of a sample doped with 1.6% Ba(2+) for the Pb(2+) indicates that the doping reduces the…
Abstract This article is devoted to the study of electron‐beam‐induced degradation under argon atmosphere of an ethylene–propylene–diene monomer (EPDM, based on 5‐ethylidene 2‐norbornene) and an ethylene–propylene rubber (EPR) containing the same molar ratio of ethylene/propylene. The chemical structure modifications…
Abstract The molecular relaxation processes and structure of isotactic polystyrene (iPS) films were investigated with real‐time dielectric spectroscopy and simultaneous wide‐ and small‐angle X‐ray scattering. The purpose of this work was to explore the restrictions imposed on molecular mobility in the vicinity of the…
In this paper, very systematic experimental data on the orientation dependence of the twinning stress in Cu–8 at.% Al single crystals are reported. A method, typical for ‘latent hardening experiments’, is employed to determine the critical stresses needed to activate twin systems in a dislocated crystal. Results show…
Abstract Acrylate and methacrylate monomers were obtained by reacting vernonia oil, a naturally epoxidized oil, with acrylic or methacrylic acid. The highest conversion (85–98%) of epoxy groups was obtained when the reaction was performed with an excess of the carboxylic acid at 100–120°C. The acrylate and methacrylat…
A survey is presented covering the results obtained by the present author and his co-workers during the last decade in studies on nickel single crystals and polycrystalline nickel cyclically deformed up to the saturation stage. Two main features of cyclic plasticity are the subject of discussion. The first part of the…
We measured the optical properties of mixed-valent vanadium oxide nanotubes to investigate the charge degrees of freedom in these novel materials. The electronic structure strongly resembles that of other bulk, low-dimensional, and molecular vanadates. The 1.2-eV band is assigned as a superposition of V 4+ d → d and V…
This paper reports for the first time on the fabrication of honeycomb-patterned cellulose films by casting water in oil emulsion of cellulose acetate onto a glass substrate and subsequent deacetylation treatment. The honeycomb pore size could be controlled from 1 to 100 microm under a saturated water vapor condition.…
Temperature dependence of zero-bias conductance of the vanadium (V)/multiwall carbon nanotube (MWNT)/V structure is studied. As temperature is reduced, the conductance decreases with a functional form consistent with a power law. For the first time, we find that the exponent depends significantly on gate voltage. This…
Abstract A new fluorinated diamine monomer, 2′,5′‐bis(4‐amino‐2‐trifluoromethylphenoxy)‐ p ‐terphenyl, was synthesized from the chloro‐displacement of 2‐chloro‐5‐nitrobenzotrifluoride with the potassium phenolate of 2,5‐diphenylhydroquinone, followed by hydrazine palladium‐catalyzed reduction. A series of trifluoromet…
The crossed-lamellar microarchitecture (microstructure) of the shell of Strombus gigas, the giant Queen conch native to Caribbean habitats, is the most common of the several shell microarchitectures known in the mollusk family. We have studied tissue regeneration in juvenile S. gigas conchs and compared the microstruc…
81Br Nuclear quadrupole resonance (NQR) measurement was performed in an S = 1/2 one-dimensional Heisenberg antiferromagnetic metal complex [NiBr(chxn)2]Br2 (chxn: 1R,2R-diaminocyclohexane), having a halogen-bridged MX chain structure -Br-Ni3+-Br-Ni3+-Br-. Two 81Br NQR signals were observed below 40 K, while a single s…
Nephrogenic fibrosing dermopathy (NFD) is a rare, recently described cutaneous fibrosing disorder that primarily affects patients with a history of renal disease [1]. Since the first report in 2000 by Cowper et al., about 100 cases of NFD have been described worldwide, and clusters have been observed in dialysis units…
Spider dragline silk is a semicrystalline protein polymer in which alanine-rich crystalline regions are connected by soft glycine-rich linkers that, in dry fibers are quiescent but become motionally active when plasticized by water. Using solid-state NMR to probe molecular motion and orientation of selectively 13 C-la…
We have studied the energetics and mobility of neutral hydrogen in alumina ${\mathrm{Al}}_{2}{\mathrm{O}}_{3}$ using ab initio density-functional calculations. The mobility of hydrogen was studied in corundum $(\ensuremath{\alpha}\ensuremath{-}{\mathrm{Al}}_{2}{\mathrm{O}}_{3})$ as well as in liquid alumina. Using bot…