Materials Literature
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Abstract This work focuses on the study of uniaxial elongational flow and its effects on morphology and stiffness of polyamide‐6 based nanocomposites prepared by melt compounding. The elongational flow characterization was realized by converging flow method and fiber spinning technique. During the haul‐off tests, fibe…
Alterations in the phase composition, porosity, and surface morphology of coatings are examined following the insertion of a quantity of Ta 2 O 5 into active coatings prepared from IrO 2 or IrO 2 + RuO 2 + TiO 2 (OIRTA). It is shown that even an insignificant concentration of Ta 2 O 5 in a coating renders it substanti…
Ion beam sputtering has been used to grow 50-period SiOx∕SiO2 multilayers (MLs) and single-layer SiOx under varying conditions of oxygen content (x). Annealing these materials at 1100°C has led to the formation of Si nanocrystals in the SiOx layers and some of them have been hydrogenated to passivate Si dangling bonds…
The morphology and structure of bulk poly‐butene‐1 phase III samples dried from concentrated solutions is independent of the solvent used for sample preparation. The lamellar spherulitic morphology is similar to that of PB‐1 samples prepared by melt crystallization. Phase III represents the least perfect crystal struc…
The structural and thermal properties of solvent-induced poly(ethylene terephthalate) (PET) polyester have been investigated. Flat, high twist and spun yarns were treated with trichloroacetic acid-methylene chloride (TCAMC) mixed solvent for 5 min at about 25 °C. The treatment influenced the solvent- induced crystalli…
Abstract Spherical, rod‐ and tetrapod shaped CdSe nanocrystals are investigated by Raman spectroscopy and the longitudinal‐optical and surface optical phonons are observed. We find that the position of the longitudinal‐optical phonon slightly red‐shifts with decreasing diameter, whereas the position of the surface opt…
We report on an unusual staining phenomenon of a diblock copolymer, poly(ferrocenylsilanes)- b -poly(dimethylsiloxanes) (PFS- b -PDMS). By a combination of transmission electron microscopy (TEM) and energy dispersive X-ray (EDX) analysis, it is found that when a thin section of diblock copolymer is exposed to rutheniu…
We obtain a solution of the three-phase model in the limit d∕λ⪡1, where the complex refractive index ñ=n+iκ and thickness d of an isotropic film on an isotropic substrate are given analytically at any single wavelength λ from polarimetric data Δρ∕ρ and ΔR∕R, where ρ is the complex reflectance ratio and R is either th…
The correlation between heat-treatment temperature for crystallization and orientation of surface crystalline phase, which should correspond to the intensity of second-order optical nonlinear susceptibility, in 30BaO-15TiO2-55GeO2 (BTG55) crystallized glass was examined by measurements of x-ray diffraction (XRD) and s…
Oxidative atmospheric pressure plasma was utilized to activate surface of PA 6,6 fabrics followed by graft copolymerization of glycidyl methacrylate (GMA) and further reacted with triethylene tetramine (TETA), quaternary ammonium chitosan (HTCC) or β-cyclodextrin (β-CD). The inner CD cavity was complexed with some ins…
Copper metallized AlGaAs/InGaAs pseudomorphic high-electron-mobility transistor (PHEMT) single-pole-double-throw (SPDT) switches utilizing platinum (Pt, 70nm) as the diffusion barrier is reported for the first time. In comparison with the Au metallized switches, the Cu metallized SPDT switches exhibited comparable per…
Finite-size effects in armchair (n,n) carbon nanotubes are studied as a function of the tube length by using the generalized tight-binding calculations. End structures of the tubes considered here are caps formed from hemispherical pieces of I h fullerenes and hydrogen-free open ends. It has been clarified that the di…
The prediction of mass-transfer rates into and from moving drops in the liquid−liquid systems has usually used the well-known Whitman two-film theory approach. According to the latter, the total resistance to mass transfer resides on each side of the interface and is described by the individual film mass-transfer coef…
New water-soluble conjugates in the form of Schiff bases (DGM-1 and DGM-2) were prepared by the interaction of water-soluble periodate-oxidized galactomannan with doxorubicin or N-(L-lysyl)doxorubicin, respectively. The water-soluble galactomannan (DAVANAT a commercial product of Pro-Pharmaceuticals company) was obtai…
The coherent control of a charge-density-wave (CDW) collective mode in 1 T -TaS 2 was performed using a femtosecond pulse pair. Selective enhancement and suppression of the oscillation were achieved by optimal pulse separation. The ratio of enhancement to suppression and pulse-separation dependence of the amplitude sh…
A brief review of research papers on some diluted magnetic semiconductors is given. Experimental results on the study of the ferromagnetic state in the most promising materials for use in spintronics are presented.
Luminescence and excitation spectra for YF 3 :Gd 3+ , YF 3 :Pr 3+ , and YF 3 :Pr 3+ ,Gd 3+ have been studied in the vacuum ultraviolet (VUV) spectral region at room temperature. In YF 3 :Gd 3+ , Gd 3+ ions absorb VUV light ranging from 150 to 200 nm due to 4 f –4 f transitions, yielding an ultraviolet (UV) luminescenc…
Abstract Good optical grade single crystals of pure, Cd 2+ and Mg 2+ doped Manganese Mercury Thiyocyanate (MMTC) crystals are grown by slow solvent evaporation technique at room temperature. Single crystal XRD studies reveal that the incorporation of metallic dopants has not changed the structure of the parent crystal…
Sorption and desorption processes of subcritical and supercritical carbon dioxide in poly(methyl methacrylate) (PMMA) at various temperatures and pressures were investigated systematically. The gravimetric method was used to study the desorption and sorption diffusivities. It was found that there existed a characteris…
The authors would like to announce that they have used AFM figures of Prof. R