Materials Literature
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Aniline (ANI) was polymerized under inert atmosphere in the presence and absence of natural clay initiated by peroxydisulphate (PDS) in an aqueous acidic medium. While increasing the amount of clay the rate of polymerization (Rp) was decreased and showed first order dependence with respect to amount of clay. The % yie…
The ferroelectric domain structure of single crystalline Pb5Ge3O11 was inspected and manipulated using piezoresponse force microscopy (PFM) and Kelvin probe force microscopy (KPFM). The irregularly shaped three-dimensional maze reflecting the as-grown domain structure on the micron and submicron scale was resolved wit…
Neutron reflection was used to measure the buildup of layers at a solid surface as the smectic phase is approached from higher temperatures in a nematic liquid crystal. The liquid crystal was 4-octyl-4'-cyanobiphenyl (8CB), and the solid was silicon with one of five different surface treatments that induce homeotropic…
ABSTRACT Virtual tensile experiments on cylindrical copper wires of nanometric diameter were carried out using molecular dynamics techniques based on the embedded‐atom method. Transverse, atomically sharp surface cracks with circular fronts of different depths are introduced to evaluate their effect on the mechanical…
Considerable interest has developed in the potential use of II--VI oxides as electronic and optical materials. In several cases, alkali atoms have been suggested as dopants. We report on the theoretical and experimental investigation of infrared and vibrational properties of a Li-OH complex in ZnO. Earlier infrared ex…
We have investigated the Faraday spectra of ferromagnetic rutile Ti1−xCoxO2−δ films grown on Al2O3 (0001). The Faraday spectra strongly depended on the film thickness, revealing the significant effect of the multiple reflections of light. The intrinsic Faraday spectra of rutile Ti1−xCoxO2−δ were corrected for this mul…
Abstract In this study, the silk treated by steam explosion was pulverized into fine powder with a mean particle size of 1.829 μm, then the feasibility of the application of the protease treatment to produce finer and more uniform silk powder was investigated. The results indicated that after the enzymatic treatment,…
Detailed optical metallographic studies at room temperature on polycrystalline Gd5Ge4 are presented for two cases: (a) a sample in the as-cast condition and (b) the same sample subjected to a known number of temperature and magnetic field cycles. A herringbone-?(criss-cross-) like pattern whose characteristic feature…
Abstract A novel amphiphilic biodegradable graft copolymer based on poly(aspartic acid) (PASP) was prepared by coupling monomethoxy poly(ethylene glycol) as the hydrophilic segment with PASP‐ g ‐octadecyl (PASP‐ g ‐OD) as the hydrophobic backbone. The critical micelle concentration of the copolymer was obtained by mea…
Thermogravimetric analysis (TGA) makes it possible to obtain information on change in physicochemical properties of bio-polymeric components of flax fibres when determining their quantitative content by burning microsamples in the range of 25-500°C. The results obtained have shown an individual pattern of TGA and diff…
Abstract In the present study, the effect of talc content on the mechanical, thermal, and microstructural properties of the isotactic polypropylene (i‐PP) and elastomeric ethylene/propylene/diene terpolymer (EPDM) blends were investigated. In the experimental study, five different talc concentrations, 3, 6, 9, 12, and…
Abstract SBA‐15 frameworks with encapsulated Keggin type heteropolyacids (HPAs) were synthesized in situ under strongly acidic conditions (pH < 0). During the hydrolysis of tetraethyl orthosilicate (TEOS), a P‐ and a Mo source were added into the initial sol–gel system to form Keggin type HPAs. The texture of the f…
We report on the use of amorphous Ni–Al film (a-Ni–Al) as conductive diffusion barrier layer to integrate La0.5Sr0.5CoO3∕PbZr0.4Ti0.6O3∕La0.5Sr0.5CoO3 capacitors on silicon. Cross-sectional observation by transmission electron microscope reveals clean and sharp interfaces without any discernible interdiffusion/reactio…
A charge-induced reversible variation of the paramagnetic susceptibility χ of Pd is reported. In situ charging was performed by means of a nanocrystallite-electrolyte composite. The charge-induced variation of χ is analyzed taking into account the modification of the charge carrier density by surface charging and the…
Magnetic and transport properties were investigated in Zn0.94Mn0.03Co0.03O thin films prepared by dual radio frequency magnetron sputtering technique. A negative magnetoresistance (MR=[ρ(H)−ρ(0)]∕ρ(0)) of −95% at 2K and a positive MR of 48% at 10K were established in the films. The anomalous magnetic and magnetic-rela…
Porous chiral thin films composed of a nearly hexagonal-close-packed array of helical nanorods of tris-(8-hydroxyquinoline) aluminum (Alq3) are fabricated using glancing angle deposition and exhibit a one-dimensional polarization-dependent photonic stop band. These chiral thin films transmit only one handedness of cir…
It is well known that overdamped unforced dynamical systems do not oscillate. However, well-designed coupling schemes, together with the appropriate choice of initial conditions, can induce oscillations (corresponding to transitions between the stable steady states of each nonlinear element) when a control parameter e…
Abstract Summary: The phase development mechanism during drawing from a highly entangled melt of ultra‐high‐molecular‐weight polyethylene is analyzed by simultaneous measurements of in situ X‐ray diffraction using synchrotron radiation and stress/strain behavior. The stress/strain curve exhibits a plateau region at th…
The behavior of rod-coil diblock copolymers close to a surface is discussed by using extended scaling methods. The copolymers are immersed in selective solvent such that the rods are likely to aggregate to gain energy. The rods are assumed to align only parallel to each other, such that they gain a maximum energy by f…
The puzzling behavior of space charge inside solid dielectrics has been revealed by space charge measurement techniques. In particular, positive and negative “charge packets” propagating through the bulk with a repetitive character are thought to be related to prebreakdown mechanisms. Here, we investigated the space c…