Materials Literature
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Blends of poly(vinyl chloride) (PVC) and acrylonitrile-chlorinated polyethylene-styrene (ACS) copolymer were prepared by melt blending. Miscibility, phase behavior, and thermal stability were studied using differential scanning calorimetry (DSC), scanning electron microscopy (SEM), and thermogravimetric analysis (TGA)…
An experimental study of flame-spreading behavior over thin Mg/PTFE/Mg (magnesium/poly-tetrafluoroethylene/magnesium) films with a thickness of 10/25/10 μm was conducted in both a pure argon and a 10% oxygen/90% argon environment. The objectives of this research was to determine the effect of initial chamber pressure,…
An earlier Monte-Carlo simulation of a cholesteric configuration of molecules is generalised in the present work allowing for full rotational degrees of freedom. The effect of temperature on pitch has been studied and the results are compared with the results obtained from mean field and plane rotator model simulation…
In this study the temperature dependence of the surface properties of a side-chain liquid crystalline polyacrylate is investigated through contact angle measurements. In particular, the effect of the glass transition (Tv=46.7°C) on the surface tension of the liquid crystalline polymer is analysed. The total surface te…
The reaction between OH radicals and [Cu II (P 2 O 7 ) 2 (H 2 O) 2 ] 6- results in the formation of a Cu(III) complex. No reaction is observed with N 3 • or Br 2 •-, whereas SO 4 •- initiates the same steps as seen with • OH. This suggests that the mechanism probably involves a ligand interchange or H • atom abstracti…
Phase situation of didodecyldimethylammonium bromide (DDAB) was investigated by means of differential scanning calorimetry. X-Ray diffraction and optical microscopy methods. A complex polymorphism was detected. Apart from the crystalline phase on heating there are two liquid crystalline phases below the isotropic liqu…
Starting with a discrepant event and led through a series of experiments, students of an introductory chemistry course investigate if copper metal reacts with acetic acid. Finding that oxygen from the air plays an important role in the reaction of these substances, students ultimately realize that the conditions under…
To study in detail the nature of the advancing solid/liquid interface, thin specimens of the binary eutectic alloys Bi-Pb2 Bi and Bi-Sn were solidified at various low speeds (5.7–115 nm S−1) and quenched to form a representative interface for subsequent examination. Both eutectic alloys were found to be of the faceted…
The optical properties of amorphous-diamond films prepared by a mass-separated ion beam are studied and compared with the shape of the corresponding Raman spectra. The Raman measurements with moderate spatial resolution indicate that the films possess the sp3 fraction distributed along the film surface, the thinner ed…
A study has been done on the mechanical properties of poly vinyl chloride/ethylene vinylacetae (PVC/EVA) polymer blends filled with stearic acid coated calcium carbonate (Forcal-S). Both impact strength and stiffness of the composites are optimized by varying EVA and filler (Forcal-S) contents. The results show that t…
Oil-in-water emulsions stabilized by kaolinite clays were demulsified by the addition of fresh oil under the action of mixing in a continuous mixer−settler setup. The clays were treated with different concentration of asphaltenes, resulting in clays having different contact angles. It was found that the variation of t…
thin films prepared by a solution‐deposition process were formed at various annealing temperatures. P‐E hysteresis loops of the films exhibited well‐defined shapes, and the leakage current decreased with increasing annealing temperature except for one annealed at 750°C. The considerable amount of metallic Bi on the fi…
Using a continuum model of Ericksen and James, we compute a number of fine scale structures commonly observed as a result of martensitic phase transformations. Our results provide numerical validations of the Ericksen--James model. We show that care is needed in the discretization stage if spurious microstructures are…
A new reduced-order model (ROM) is proposed for the bulk-controller presented in Part I. This model considers convection in the melt based upon the assumption of an idealized flow geometry consisting of horizontal donuts and vertical tubes with radial and axial dispersion, respectively. Boundary and bulk layers are as…
Abstract The temperature dependences at 110 to 400 K of the : 1 H spin-lattice relaxation time (7\) of the phenethylammonium ion in phenethylammonium lead(II) halides, [C 6 H 5 CH 2 CH 2 NH 3 ] 2 PbX 4 (X = Cl, Br, I), revealed that this ion shows reorientation of the NH 3 moiety around the three-fold axis and torsion…
Transmission electron microscopy and scanning electron microscopy offer evidence that the purely chemical HF:HNO3:H2O “stain etch” used to form light-emitting porous silicon is actually composed of competing etches. A localized etch forms the porous nanostructure by propagation of a discrete reaction interface into th…
The mechanical response and failure behavior of Epon 828/T-403 epoxy were experimentally obtained over a strain rate range of 1.7 × 10−5 to 4.7 × 103 s−1 and a temperature range of −190 to 100°C. Compressive loads were applied in both uniaxial and multiaxial manners. A modified split Hopkinson pressure bar was employe…
Radiation-cooled rockets are used for a range of low-thrust propulsion functions, including apogee insertion, attitude control, and repositioning of satellites, reaction control of launch vehicles, and primary propulsion for planetary space- craft. The key to high performance and long lifetimes for radiation-cooled ro…
Electronic properties of passive layers grown anodically on Al 7075 (UNS A97075) in chromate and oxalate solutions during polarization at 500 mVSCE were investigated using electrochemical impedance spectroscopy (EIS). Impedance results were analyzed in terms of capacitance-vs-frequency plots during reverse polarizatio…
In the present work the effect of incident laser power on the Raman spectra of diamond isolated particles and continuous films deposited on silicon and glassy carbon (GC) substrates by the chemical vapor deposition method is investigated. It is shown that the Raman line position measured for diamond particles shifts t…