Materials Literature
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Abstract Graft polymerization of acrylic acid from monomer solutions in water or in bulk onto low‐density polyethylene film substrate was carried out by the method of continuous process under UV radiation. Effects of the nature of photoinitiator on acrylic acid grafting was first studied. One PI 2 and two PI 1 photoin…
Abstract Two new poly( p ‐phenylene vinylene) derivatives OX1‐PPV and OX2‐PPV bearing two 1,3,4‐oxadiazole rings per repeat unit and a fully conjugated backbone with solubilizing dodecyloxy side groups were synthesized and investigated. The amorphous conjugated polymers had glass‐transition temperature values of 60–75…
Analytical expressions are derived for the self-energies of electrons in carbon nanotubes while interacting with impurity atoms. Results are reported for armchair and zigzag tubes. It is shown that the impurity causes a bound electron donor or acceptor state beneath every semiconductor band edge. If the tubes are meta…
The understanding of surface properties of core-shell type nanoparticles is important for exploiting the unique nanostructured catalytic properties. We report herein findings of a spectroscopic investigation of the thermal treatment of such nanoparticle assemblies. We have studied assemblies of gold nanocrystals of ap…
Annealing temperature effects on the structure and electrical resistance of Ge 2 Sb 2 Te 5 thin film were studied. The crystallization and melting temperature of the thin film are about 175 degrees C and 610 degrees C respectively. The structure of the as-deposited and the annealed film at different annealing temperat…
Spinel ferrites (iron cobalt oxide) were prepared by the microemulsion method at different temperatures and sodium dodecyl sulphate (SDS) surfactant concentrations. Subsequently, a quantity of the different samples were coated with an intrinsically conducting polymer (ICP) shell of polypyrrole. The polymer shell was s…
Magnetization steps from ${\mathrm{Mn}}^{2+}$ pairs in several single crystals of ${\mathrm{Zn}}_{1\ensuremath{-}x}{\mathrm{Mn}}_{x}\mathrm{O}$ $(0.0056<~x<~0.030),$ and in one powder $(x=0.029),$ were observed. They were used to determine the four largest exchange constants (largest $J$'s), and the single-ion a…
A review of transmission electron microscopy studies of planar defects in 18R and 2H martensites in Cu-Zn-Al alloys is presented. The non-basal plane faults observed in the 2H structure, the F1 faults, show two kinds of dislocations at their ends. In contrast, two types of non-basal plane faults are observed in the 18…
Two new ternary uranium selenides, AU(2)Se(6) (A = K, Cs), were prepared using the reactive flux method. Single crystal X-ray diffraction was performed on single crystals. The compounds crystallize in the orthorhombic Immm space group, Z = 2. CsU(2)Se(6) has cell parameters of a = 4.046(2) A, b = 5.559(3) A, and c = 2…
Erbium and ytterbium environments in low-silica calcium aluminate glasses, with nominal composition 58 CaO, $27.1\ensuremath{-}x$ ${\mathrm{Al}}_{2}{\mathrm{O}}_{3},$ 6.9 MgO, 8 ${\mathrm{SiO}}_{2},$ x ${\mathrm{Er}}_{2}{\mathrm{O}}_{3},$ or ${\mathrm{Yb}}_{2}{\mathrm{O}}_{3},$ $0.2<~x<~1.5(\mathrm{mol}%),$ were…
Abstract The fiber properties of PTT have been the subject of several reports, although very few reports describe the properties of molded specimens. In this work, the dynamic mechanical relaxation behavior of compression‐molded PTT films has been investigated. The added flexibility of the PTT was found to lower the t…
Abstract A high‐trans 1,4‐butadiene/isoprene copolymer (TBIP) was synthesized in a 5‐L autoclave with hydrogen as an effective molecular weight modifier. The effects of hydrogen on the catalyst efficiency and molecular weight of the copolymers were investigated. The processability and physicomechanical properties of T…
In this article, we demonstrated the synthesis of metallodielectric composite particles comprising a metal shell on a dielectric core and an outer coating of an insulating dielectric layer by depositing silver on silica supporting cores followed by coating of titania. A combination of surface reaction and surface seed…
Abstract Novel adsorbents were prepared by immobilizing tannins on collagen fibre matrices. Their adsorption properties, including adsorption equilibrium, adsorption kinetics, and column adsorption kinetics to Cu(II) were investigated. Immobilized Myrica rubra tannin and black wattle tannin exhibited significantly hig…
Abstract Pretreatment of shrimp shells was investigated in order to lower the costs and to improve the sustainability of chitin production. Physical pretreatment comprising drying, grinding and sieving is attractive for the recovery of 50% of shrimp protein as a dry powder. Pretreatment of shells by shearing in acidif…
This paper describes the fabrication of self-assembled monolayer (SAM) patterns of m-d-poly(ethylene glycol) (m-dPEG) acid molecules onto polyelectrolyte multilayers (PEMs). The patterned SAMs on PEMs were created by ionic interactions using microcontact printing (microCP) technique. The created m-dPEG acid monolayer…
The double perovskites ${\mathrm{La}}_{2}M{\mathrm{RuO}}_{6+\ensuremath{\delta}}$ contain ${M}^{2+}$ ions for $M=\mathrm{Mg},$ Zn, Co, and Ni and for $M=\mathrm{Mn}$ and Fe, ${M}^{3+}$ ions. Annealed samples have ordered ${M}^{2+}$ and Ru(IV), but samples with ${M}^{3+}$ ions are atomically disordered and remain oxidi…
Abstract Effects of the operating policies—the initial initiator amount; the initial emulsifier amount; the monomer addition mode: batch or semibatch; and the monomer addition rate under “monomer‐starved conditions” for the control of particle size distribution (PSD)—were studied through a model that simulates batch a…
Summary 1. The effect of phosphate on species composition in biofilms was studied under three different phosphate regimes (0.5, 5 and 50 μ m ) in two different multi species communities: one composed of the four diatom species Melosira varians , Nitzschia perminuta , Navicula trivialis and Achnanthes lanceolata and on…
Let's twist again: Reaction of a racemic mixture of secochlorinato nickel(ii) with cholesterol generates separable diastereomers of a novel porphyrinic chromophore containing a direct β-to-o-phenyl linkage. Exchange of the cholesteryl side chain for an ethyl group produces the enantiomeric conformers of the ruffled ma…