Materials Literature
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Despite the recognition of several sources of variation of contact angle, both between and within sessile drops on plane substrates, no comment has ever been made on the statistical treatment of observed angles, especially those around single drops. Circumperipheral observations are suggested as essential, and analysi…
Parallel‐ and perpendicular‐polarized Raman and KBr pellet transmission IR spectra of quenched 10K 2 O‐50SiO 2 ‐nR 2 O 3 (R = La, Gd, Yb; n = 0, 1, 5, 10 mol) glasses are presented. Increasing lanthanide oxide concentration produces partially‐polarized high‐frequency bands at 1030, 940, and 860 cm −1 , assigned to the…
The resolution in optical scanning microscopy is limited by the numerical aperture N.A. of the objective and the wavelength of the light lambda, so that the modulation transfer is zero beyond the spatial frequency of 2 N.A./lambda. However, when an optical property of the object changes under the influence of the scan…
The influence of pressure, temperature, and bulk composition on the structure of di‐ and tetra‐aluminosilicate melts and quenched melts have been studied with Raman spectroscopy. The melt polymerization and Al/(Al + Si) ranges represented are those typically found in quartz‐normative basaltic magmatic liquids. The rea…
Melt viscosities and densities of isobarically quenched melts (glasses) have been determined for K 2 Si 4 O 9 up to pressures of 2.4 GPa. At 1200°C, melt viscosity decreases linearly from 1700 P at 1 atm to 310 P at 2.4 GPa. The increase in glass density with increasing pressure is described by a Birch‐Murnaghan equat…
Epitaxial yttria-stabilized zirconia films were grown on Si (100) and Si (111) by pulsed laser deposition. Rutherford backscattering spectroscopy indicates a high degree of crystalline perfection with a channeling minimum yield of 5.3%. A necessary predeposition process is removal of native silicon oxide from the Si p…
Abstract Thermal and mechanical properties were measured for solvent‐cast films of cellulose acetate propionate plasticized with triphenyl phosphate. Probabilistic models for the glass transition temperature, tensile heat deflection temperature, tensile modulus, break stress, and initial tear strength as functions of…
Abstract Antifoam compositions for aqueous surfactants are usually emulsions of insoluble oils containing hydrophobic solids. The emulsion allows easy access to the aqueous environment. The oil droplets carry the solid particles to the foam interfaces by spreading, which also contributes to foam rupture. The particles…
Abstract The preparation of PVA films and fibers with high modulus and high strength was examined. The high drawing was attained when both the drawing just before melting and the relaxation at room temperature were repeated. The maximum draw ratio was 40 for the films prepared from the gels of high molecular weight (H…
Abstract Extrusion‐blown film prepared from a semidry mixture of starch and poly(ethylene‐co‐acrylic acid) (EAA) cannot be sharply separated into its polymeric components by selective solvent extraction, and the two polymers have the outward appearance of being compatible. Also, the starch portion is resistant to enzy…
Abstract Linear low density polyethylene (LLDPE) was reinforced with wood fiber, glass fiber, and mica. The effect of aging on mechanical properties of the composites was examined under different conditions: (i) exposure at 105°C for 7 days; (ii) immersion in boiling water for 4 h. Samples containing glass fibers show…
Abstract Polyethylene and polystyrene composites filled with high‐volume content of filler particles (quartz or Al 2 O 3 ) were prepared by ordinary melt‐casting method to effectively increase the thermal conductivity. The result, however, suggested that fractional void volume cssentially occupied by filler particles…
Formation of radiation damage and its recovery in ${\mathrm{UO}}_{2}$ single crystals were investigated in the temperature range from 5 to 293 K. The samples were implanted with Xe ions at 5 K and subsequently in situ analyzed using the ion-channeling technique. Successive measurements were performed during the warmin…
Quasi-phase-matched second-harmonic generation has been observed in a periodically poled nonlinear optical polymer waveguide. Key elements in this demonstration include novel nonlinear optical polymers that can be spin coated, the design and fabrication of periodic electrodes for periodic poling and the optimization o…
A high-speed nematic liquid crystal modulator with response time less than 100 μs at room temperature was demonstrated. The effects that contribute to the observed high speed are the transient nematic effect, a new liquid crystal mixture, and a holding voltage technique.
Indirect evidence is presented that free-standing Si quantum wires can be fabricated without the use of epitaxial deposition or lithography. The novel approach uses electrochemical and chemical dissolution steps to define networks of isolated wires out of bulk wafers. Mesoporous Si layers of high porosity exhibit visi…
Analysis of anions ability to transfer from one structural position into another is applied for predicting the properties of apatite.
Abstract Stoichiometric Al-bearing ferrites[AlxFe3-xO4 (x=0.05–0.46)] are formed by a transformation reaction from γ-FeOOH in an aqueous suspension. The transformation reaction proceeds in a suspension containing γ-FeOOH, Fe(II) and Al ions without oxidation at 25°C and a pH of 9.5–11.0.
Abstract A novel substituted acetylene monomer, 4,4′‐(1,2‐ethynediyl) bis (phthalic anhydride) (EBPA) was made in six steps from 4‐nitro‐ N ‐methylphthalimide (4‐NPI) including two palladium‐catalyzed acetylene coupling steps. Several new polyimides were prepared from this monomer and six aromatic diamines. In additio…
Detailed information on the preparation and application of antiozonants to the production of rubber has been collected from the patents published till 1987 inclusive. From among the numerous organic compounds acting as antiozonants and antioxidants, several classes can be distinguished and grouped on the gasis of the…