Materials Literature
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The long afterglow strontium aluminate phosphor SrA l2 O 4 : Eu 2+ , Dy 3+ was prepared by a solid-state reaction method. The luminous fiber was prepared by melt spinning mixturing this complex and polyethylene terephthalate. The morphology and optical properties of the products had been characterized. Scanning electr…
A series of novel zinc alkoxides supported by chelating maltolato (MalO; MalOH = maltol) ligands were successfully synthesized and characterized. Reaction of MalOH with ZnEt 2 (3:4) gives a trinuclear cluster [Zn 3 (Et) 2 (MalO) 4 ] ( 1 ), which spontaneously disproportionates in solution to mononuclear species [Zn(Ma…
Silver nanowires synthesized by a solvothermal method were used as templates for fabricating silver‐nanoparticle‐decorated silver (AgNP/Ag) nanowires. The number density and particle size of Ag nanoparticles can be controlled by varying the concentration of Ag precursor. Single AgNP/Ag nanowire exhibited strong surfac…
Block copolymer films obtained by dip-coating have been much less studied than those obtained by spin-coating, although it is an important industrial process. In our investigations of supramolecular diblock copolymer films of PS–P4VP (∼30 wt % P4VP) dip-coated from THF solutions, we initially found that films containi…
The optical gap of nanometer sized diamond cages, i.e., diamondoids, lies in the ultraviolet spectral region. Here we show by hybrid functional based time-dependent density-functional calculations that, by varying the number of C=S double bonds at the surface of diamondoids, the absorption onset can be tuned toward th…
On the basis of fundamental parameter approaches, the validity of standardless wavelength dispersive X‐ray fluorescence (WDXRF) and X‐ray powder diffraction algorithms was confirmed for analyzing Egyptian iron ore samples collected from two different locations, Aswan and Baharyia. The studied Egyptian iron ores repres…
A series of new tetraazapyrene (TAPy) derivatives has been synthesized by reducing 1,4,5,8-tetranitronaphthalene to its corresponding tin salt (I) and reacting it with perfluorinated alkyl or aryl anhydrides. The resulting 2,7-disubstituted TAPy molecules and the known parent compound 1,3,6,8-tetraazapyrene (II) have…
The effect of gamma radiation on the mechanical properties and surface structure of woven fabrics made of cotton, flax, and silk fibers was investigated. It was found that small radiation doses (up to 15 kGy), sufficient for effective disinfection of textiles, caused only insignificant changes in the fiber parameters…
Building and, especially, reconstruction and repairs of highways, call for the development of stone materials manufacturing industry. Increasing need for stone materials may be satisfied by a wide use of industrial waste and secondary resources. In road building, slag of ferrous and nonferrous metallurgy is one of the…
Abstract Nanostructured silicon germanium thermoelectric materials prepared by mechanical alloying and sintering method have recently shown large enhancement in figure‐of‐merit, ZT . The fabrication of these structures often involves many parameters whose understanding and precise control is required to attain large Z…
Controlled biodegradability of biomaterials is very important because different functionality and durability are required for various purposes and for specific tissues and organs. From this point of view, silk-based biomaterials have poor usability because of uncontrollable degradability, even though silk fibroin (SF)…
Three new donor–acceptor (D–A) type copolymers P1, P2, and P3 have been synthesized by Stille condensation between the distannyl derivative of thiophene-capped cyclopenta[ c ]thiophene (CPT) with 4,7-dibromo[2,1,3]benzothiadiazole, 4,7-dibromo[2,1,3]benzoselenadiazole, and 4,7-dibromo[2,1,3]benzotriazole, respectively…
Recent environmental problems and societal concerns associated with the disposal of petroleum based plastics throughout the world have triggered renewed efforts to develop new biodegradable products compatible with our environment. This article describes the preparation, characterization and biodegradation study of po…
Polymersomes are self-assembled spherical vesicles based on amphiphilic block copolymers. This review presents a summary of the achievements in the field of polymersome researches to date. Polymersomes have been applied as versatile drug carriers. Some polymersomes, which have well-known stimuli-responsibility, can re…
Keeping track: By combining differential interference contrast (DIC) image pattern recognition with DIC polarization anisotropy, the exact full three-dimensional angular information of individual tilted gold nanorods positioned in the focal plane of the objective lens can be readily determined. The angular rotational…
Time-dependent changes of thermodynamic properties due to structural relaxations and physical aging occur in all glasses. We show that the physical aging of thin supported films of star-shaped macromolecules, with f arms of length N(arm), exhibits average aging dynamics that are sensitive to f and N(arm). Regions of t…
Poly(ε-caprolactone) (PCL) was conjugated with heparin and fabricated into nonwoven tubular scaffold by electrospinning. The dynamic contact angle analysis revealed the hydrophilicity improvement due to heparin concentrating on the conjugate surface. The microbicinchoninic acid and quartz crystal microbalance measurem…
Spectroscopic properties of bismuth doped borate, silicate and phosphate glasses have been reinvestigated in this work. It shows the typical decay time of Bi(3+) is around 500ns rather than 2.7-to-3.9 μs reported by Parke and Webb at room temperature. Introduction of higher content either alkali or alkali earth into b…
Based on the first-principles calculations, we investigate the magnetic and electronic properties of α-graphyne nanoribbons (NRs). We show that all the armchair α-graphyne NRs are nonmagnetic semiconductors with band gaps as a function of ribbon widths. The zigzag α-graphyne NRs are found to have magnetic semiconducti…
We describe herein an original approach for the efficient immortal ring-opening polymerization (iROP) of trimethylene carbonate (TMC) under mild conditions using dual-catalyst systems combining a discrete cationic metal complex with a tertiary amine. A series of new zinc and magnesium cationic complexes of the type [{…