Materials Literature
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A linear arrangement of guest molecules in perhydrotriphenylene inclusion compounds can lead to supramolecular materials with optimized physical properties. Through cocrystallization, different guests displaying pronounced nonlinear optical properties were incorporated within the channels of the host species (shown on…
Conventionally solidified samples of decagonal Al70Co11Ni19 annealed at 1050degreesC for 12h, studied by electron diffraction and high-resolution transmission electron microscopy (HRTEM), display sharp spots in their diffraction patterns and almost no diffuse background scattering. Detailed geometric analysis of tilin…
We report on both polar and nonpolar light-induced orientation of a polyimide of high glass transition temperature (Tg ≈ 210 °C) with nonlinear optical azo dye molecules in the side chain. This photoinduced orientation is shown to occur at room temperature, i.e., at least 190 °C below the Tg value of the polymer, whic…
We justify the application of the theory of the kink-type motion for interphase boundaries for perovskites at first-order phase transitions and obtain a criterion for separating two mechanisms for the front motion---the latent heat transfer and the relaxation of the order parameter. Calculations of the velocity of the…
Outlines an approach to the problem of simulating the drape of fabrics. The approach is based on representing fabrics as two‐dimensional continua and using the differential geometry of surfaces to describe the shape of the draped fabric and to deduce deformation measures. The approach follows the philosophical approac…
Transparent polymeric materials with high heat resistance and low water absorption were designed based on the alternating copolymers of N-substituted maleimide (RMI) with isobutene (IB). The N-substituent of the maleimide significantly affected the glass transition temperature (Tg) and water absorption of the copolyme…
The preparation of filled two-component semi-interpenetrating polymer networks (semi-IPNs) is described and the results of an investigation of their morphology by means of dynamic mechanical spectroscopy are considered. The influence of an active dispersed filler (γ-Fe2O3) on the semi-IPNs phase structure is studied.…
Abstract Low‐molecular‐weight polystyrene was nitrated to different levels. The nitrated polystyrene was blended with different molecular weights of poly(acrylic acid), PAA. The glass transition temperatures ( T g ) for the mixtures were investigated by differential scanning calorimetry. A single T g was observed for…
Abstract The crystal structure of christelite Zn 3 Cu 2 · (SO 4 ) 2 (OH) 6 · 4 H 2 O (space group P [unk]; lattice parameters a = 5.4143(8) Å, b = 6.336(1) Å, c = 10.470(3) Å, α = 94.32(3)°, β = 90.06(2)°, γ = 90.27(2)°) was solved using direct methods and difference Fourier-syntheses. The structure was refined to a f…
Other| August 01, 1996 Lattice-dynamical evaluation of atomic displacement parameters of minerals and its implications; the example of diopside Tullio Pilati; Tullio Pilati CNR, Centro per lo Studio delle Relazioni tra Struttura e Reattivita Chimica, Milan, Italy Search for other works by this author on: GSW Google Sc…
A percolation model for conducting polymers is proposed in terms of a random resistor network. The macroscopic conductivity at the critical polymer density is studied. Substantial deviations have been detected from the standard conducting behavior in percolating structures generated with a large difference between int…
The objective was to generate knowledge about the effects of the corrosion induced changes of the surface on the corrosion and electrochemical kinetics of carbon steels and pure iron exposed to aqueous CO{sub 2} solutions. Besides its fundamental interest, the knowledge is needed for the development of better steels a…
Cellulose nano-crystals (CNC) can be tailored for various value-added applications. However, its use in aqueous systems is hampered by its limited dispersability, especially at a high CNC concentration. In this study, the improvement of CNC colloidal stability by surface chemical grafting with polyacrylic acid (PAA) w…
Abstract 13 C CP/MAS NMR spectra were measured on the layered compounds [C 6 H 5 CH 2 CH 2 NH 3 ] 2 [CH 3 NH 3 ] n - 1 Pb n I 3n + 1 (w = 1, 2). The linewidth of the resonance peak corresponding to the phenyl carbons changed with temperature. The maximum broadening took place at 363 K for both com-pounds. The activati…
Abstract Electron paramagnetic resonance spectra of tetravalent terbium ions have been observed in host crystals of ZrSiO 4 , HfSiO 4 , ThSiO 4 , ThGeO 4 (zircon structure) and ZrGeO 4 , HfGeO 4 (scheelite structure) at X band and Q band and various temperatures. The spin Hamiltonian parameters have been determined fr…
Abstract The use of copper‐tungsten alloys for shaped charge liners leads to an improving of the jet penetrability into an homogeneous steel target. In comparison with copper jets, the penetration depth can be increased by a factor 1.3. The improving is due to the increasing of both the density and the break‐up time.…
Abstract The solid‐state structure of a bacterially synthesized copolyester, poly(3‐hydroxybutyrate‐ co ‐3‐hydroxypropionate), P(3HB‐ co ‐3HP), with the 3HP content ranging from 0 to 37 mol‐%, was analyzed by 13 C solid‐state high‐resolution NMR, X‐ray diffraction, differential scanning calorimetry and optical microsc…
The transverse momentum of photoelectrons released from a negative electron affinity GaAs cathode is small compared with other thermonic or field emission electron sources. A low photoelectron transverse momentum in vacuum promises highly focused, low-energy beams useful for numerous applications. A simplified theory…
Abstract The photocleavage reaction of dimer model compounds of photosensitive polyimides having cyclobutane rings in the main chain was studied. Efficient photocleavage was observed for the dimer models (CBAM2, CBAM4, and CBPM2) which had an electron‐donating aromatic substituent at the electron‐accepting imide group…
Abstract Hydrothermal treatment of a mixture of silicic acid, cobalt chloride, sodium dithionite and sodium hydroxide at 250 °C under 500 psi of argon produced a pink solid. X-ray powder diffraction (XRD), transmission electron microscopy (TEM) and electron diffraction data showed the product to be a well-crystallized…