Materials Literature
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Abstract In this study, three kinds of L ‐lactide‐based copolymers, poly(lactide‐co‐glycolide) (PLGA), poly(lactide‐co‐ p ‐dioxanone) (PLDON) and poly(lactide‐co‐caprolactone) (PLC), were synthesized by the copolymerization of L ‐lactide (L) with glycolide (G), or p ‐dioxanone (DON) or ε‐caprolactone (CL), respectivel…
A liquid laser medium with a lifetime of 492μs and a fluorescent quantum efficiency of 52.5% has been presented by stably dispersing dimethyl dichorosilane-modified Nd2O3 nanoparticles in dimethylsulfoxide. Its optical properties and mechanism were investigated and explained by fluorescence resonance energy transfer t…
Abstract A polymeric hindered amine light stabilizer (HALS), where HALS moiety was attached at the terminal end of the polypropylene chain via end‐functionalized vinylidine PP through simple organic reactions, was synthesized. It comprises the synthesis of vinylidine‐terminated polypropylene by using Cp 2 ZrCl 2 /MAO…
The article reports on low-temperature high-rate sputtering of hydrophilic transparent TiO2thin films using dc dual magnetron (DM) sputtering in Ar + O2mixture on unheated glass substrates. The DM was operated in a bipolar asymmetric mode and was equipped with Ti(99.5) targets of 50 mm in diameter. The substrate surfa…
Abstract The generation of nanocomposites upon intercalation and exfoliation of clay tactoids using melt compounding is a difficult process. In this study various polymeric binders were melt compounded with organophilic clay particles using myriad methods, including sonication, batch mixing, and twin screw extrusion.…
Abstract Calcium carbonate (CaCO 3 )‐filled low‐density polyethylene (LDPE)/linear low‐density polyethylene (LLDPE) composites were fabricated by means of a twin‐screw extruder, and the tensile mechanical properties of the tubing with thickness of 0.5 mm made from these composites were measured at room temperature to…
Abstract The first part of this investigation focused on the synthesis and characterization of a microencapsulated intumescent flame retardant (MIFR) agent. Two steps were used in the synthesis process. The structure was characterized by scanning electron microscopy, thermogravimetric anaylysis, and Fourier transform…
The critical voltage with an arbitrary pretilt angle is given analytically which is consistent with the numerical results [Acosta et al., Liq. Cryst. 27, 977 (2000)]. The author’s results show that the critical voltage is dependent on the parameters of liquid crystal and pretilt angle but is independent of the cell ga…
One of the greatest bottlenecks in producing recombinant proteins in Escherichia coli is that over-expressed target proteins are mostly present in an insoluble form without any biological activity. DCase (N-carbamoyl-D-amino acid amidohydrolase) is an important enzyme involved in semi-synthesis of beta-lactam antibiot…
This letter is a report on hybrid double walled nanotubes (HDWNTs) of crystalline ferromagnetic nickel (Ni) nanotubes encapsulated conducting polypyrrole (PPy) nanotubes through a sequentially electrochemical synthetic method. Ferromagnetic Ni nanotubes were fabricated by an electrochemical deposition method outside t…
Static magnetic measurements have been applied for the pressure-induced superconducting state in the P 2 1 / m phase of EtMe 3 P[Pd(dmit) 2 ] 2 (Et = C 2 H 5 , Me = CH 3 and dmit 2- = 1,3-dithiol-2-thione-4,5-dithiolate, C 3 S 5 2- ), which exhibits valence bond (VB) ordering with a spin gap at ambient pressure. Evide…
Abstract By oxidative coupling polymerization of the macromonomer of oligoaniline and p ‐phenylenediamine we have prepared a novel electroactive polyamide, exhibiting well‐defined molecular structure, interesting spectroscopic and electrochemical properties. The well‐defined molecular structure of the electroactive po…
The authors present a spectroscopic analysis of a planar split-ring-resonator (SRR) medium at terahertz frequencies, quantitatively characterizing the associated magnetic resonance. Experimental quantification at terahertz and infrared frequencies of metamaterial optical constants has been primarily absent, largely du…
P-15 modified poly(L-lactide-co-epsilon-caprolactone) (PLCL) microspheres were investigated as scaffolds for tissue engineering applications. PLCL copolymer was synthesized by ring opening polymerization and was composed of a soft matrix of mainly epsilon-caprolactone moieties and hard domains containing more of L-lac…
Abstract The moisture effect on the indentation force deflection (IFD) of flexible polyurethane foam was examined through the curing of the foam with different moisture contents. The employed foam was cured at 30, 40, 50, 60, 70, and 80% relative humidity, and the corresponding curing temperature was constant at 23°C.…
Abstract The reaction of the octahedral complexes cis ‐ or trans ‐[Ru(C≡N‐ t Bu) 4 (CN) 2 ], (Ru(CN) 2 ), with the photochemically active [bis(bipyridyl)bibenzimidazole‐ruthenium(II)], (RubiH 2 ), component via hydrogen bond association results in the formation of supramolecular aggregates with modified photophysical…
The lanthanum cerium in the fiber is formed by calcination of the electrospinning fibers of polymer/inorganic composite at 600 °C and a polycrystalline hollow fiber with diameter of 1∼5 μm can be obtained at 1000 °C for 12 h. After calcination at 1400 °C, the lanthanum cerium grains are closely connected to each other…
A Whole Powder Pattern Modelling of the diffraction pattern has been used to study the effect of grinding on some cubic metal powders: crystalline domain size distribution, unit cell parameter average dislocation density, effective outer cut-off radius, effective (screw-edge) dislocation character and faulting probabi…
An aluminum nanodot was self-organized between two electrodes using the anodization process of an aluminum microelectrode of 3μm in width. The authors observed a clear Coulomb staircase with a very large Coulomb energy of about 2eV at room temperature. This very large Coulomb energy is attributed to the device structu…
Using density-functional theory calculations, we investigate the atomic and electronic structure of the bromine species encapsulated in carbon nanotubes. We find that the odd-membered molecular structures (Br3 and Br5) are energetically favored than the common Br2 molecule. The transformation from bromine molecules (B…