Materials Literature
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An electrochemical process aiming at the grafting of methoxy groups on the hydrogenated porous silicon surface at room temperature has been designed. This takes place through partial anodic dissolution of porous silicon in anhydrous methanol. A dissolution mechanism is proposed by analogy with that of the anodic disso…
A model is proposed that qualitatively explains a variety of experiments on light-induced optical anisotropies in chalcogenide glasses and amorphous films. The model accounts for the sign of the observed anisotropies in thin films and predicts that even unpolarized light will cause these materials to become optically…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystal Morphology and Phase Identification in Poly(Aryl Ether Ketone)s and Their Copolymers. 4. Morphological Observations in PEKK with All p-Phenylene LinkagesRong-Ming Ho, Stephen Z. D. Cheng, Benjamin S. Hsiao, and Kenncorwin H. GardnerCite this: Macromolecules 1995, 28,…
Article A Vacancy/Dislocation Interaction Mechanism of Transgranular Stress Corrosion Cracking was published on December 1, 1995 in the journal Journal of the Mechanical Behavior of Materials (volume 6, issue 1).
The optical properties of ABCl3:Mn2+ crystals are investigated in the 300–10 K temperature range. The variation of the peak energy and the Stokes shift along the series are explained in terms of slight differences in the Mn–Cl distance. The local structure around the Mn is determined by correlating optical spectroscop…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis, Structure, and Properties of a Novel Metallic Nickel(III) Oxide in the Ce2-xSrxNiO4-.delta. System: CeSr7Ni4O15M. James and J. P. AttfieldCite this: Chem. Mater. 1995, 7, 12, 2338–2341Publication Date (Print):December 1, 1995Publication History Published online1 M…
Abstract Chitin–cellulose blends dissolved in dimethylacetamide containing LiCl (7% w/w) have been studied in a wide concentration range, from very dilute solutions to medium concentrations and up to solid films (absence of diluent). The intrinsic viscosities at various chitin–cellulose ratios, as well as the phase di…
Time-of-flight (TOF) distributions of CO 2 molecules desorbing after the oxidation of CO on Pt (111) were investigated at various desorption angles ϑ for surface temperatures T s in the range 550–800 K. The Pt (111) surface was exposed to a continuous flow of O 2 from a doser and to a chopped CO nozzle beam. Surface r…
Abstract Electron spin lattice relaxation rates were measured by saturation recovery for three oxo(5,10,15,20‐tetratolylporphyrinato)molybdenum(V) complexes, OMo(TTP)X, X=Cl − , OH − , OEt − . For O=Mo(TTP)(OEt) in glassy solution between 15 and 130 K the temperature dependence of 1/ T 1 is consistent with a two‐phot…
Simple analytic expressions for all six Leslie viscosities for nematics are obtained from the molecular theory for rigid prolate molecules. The theory relates the viscosities to the second and fourth moments, P 2 and P 4, of the molecular distribution function, the aspect ratio a of the molecules, and an isotropic vis…
The relaxation time, 1047 cm−1, of the Raman-active mode in barium nitrate crystal has been measured as a function of temperature by a time-resolved coherent anti-Stokes probe scattering technique. The temperature dependence is consistent with the combination of two relaxation mechanisms involving four and six phonons…
The previously established mechanism of two-phase nitration has been revised by proposing an additional mode of reaction, viz., interfacial nitration. The interfacial mechanism involves adsorption of the nitronium ion at the interface, followed by its reaction with the aromatic substrate present in the interfacial mon…
The ferroelectric properties were studied for polyamides consisting of m -xylylenediamine (MXD) and aliphatic dicarboxylic acids with the number of carbon atoms n =6 to 11, which were designated as nylon MXD n . Quenched samples of these polyamides exhibited the ferroelectric hysteresis loop with the remanent polariza…
We report observations of a temperature-induced orientational transition in a freely suspended nematic film of the liquid crystal 4-ethyl-2-fluoro-4\ensuremath{'}-[2-(trans-4-n-pentylcyclohexyl)-ethyl]-biphenyl (I52). The transition is from a high-symmetry state, where the molecules are perpendicular to the film bound…
Abstract Previous research and this research indicate that the mechanical melting for poly(vinylidene chloride) copolymers (PVDC) is complex. Mechanical melting is defined as the melting (or devitrification) of a polymer when a significant portion of the thermal energy originates from a mechanical energy dissipative p…
Thermoluminescence studies are carried out on samples in powder form of Li2B4O7 doped with Cu or Eu impurities. Results concerning Li2B4O7:Cu are found in agreement with data in the literature and show that the emitting defects are of intrinsic nature. In Li2B4O7:Eu a further emission is attributed to extrinsic aggreg…
Abstract Processing of microcellular foam was investigated for the feasibility of production of tough and lightweight polyurethanes. To increase the nucleation rate in a gas‐supersaturated resin, ultrasonic excitation was applied to the mixture of polyol(polyether‐based polyol) and isocyanate(diphenyl methane diisocya…
Redetermination of the structure of DL-norleucine (2-aminohexanoic acid), C6H13NO2, has given more accurate geometrical information than the early work of Mathieson [Acta Cryst. (1953), 6, 399-403]. Synchrotron radiation Laue diffraction patterns recorded over a range of temperatures have shown (a) the presence of str…
An excimer UV laser (193 nm) was used for preadhesion surface treatment of PEEK (polyetheretherketone) composite. This method presented an alternative to other limited and polluting conventional surface treatment methods. Experimental results indicated that laser preadhesion treatment significantly improved the shear…
At 1 atm of SiF 4 , mullite and SiF 4 react below 660° 7°C to form A1F 3 and SiO 2 . From 660° to 1056°± 5°C, the product is fluorotopaz. Mullite is stable in the presence of 1 atm of SiF 4 above 1056°C. The transition temperatures at other pressures of SiF 4 can be calculated from log p (atm) = 11.587 – 10811/ T (K)…