Materials Literature
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The entanglement process between water-soluble 5,10,15,20-tetrakis(4-sulfonatophenyl)-21H,23H-porphine and the amphiphilic cyclodextrin (CD) heptakis(2-omega-amino-O-oligo(ethylene oxide)-6-hexylthio)-beta-CD and the occurrence of various species at different porphyrin:CD ratios were studied by a combination of UV/Vis…
A detailed high-pressure study on ${\mathrm{LiAlH}}_{4}$ has been carried out using the ab initio projected augmented plane-wave method. Application of pressure transforms $\ensuremath{\alpha}\ensuremath{-}$ to $\ensuremath{\beta}\ensuremath{-}{\mathrm{LiAlH}}_{4}$ $(\ensuremath{\alpha}\ensuremath{-}{\mathrm{NaAlH}}_{…
Correlation between magnetic properties and Mn/Co atomic order in LaMn 0.5 Co 0.5 O 3+ δ was investigated by powder X-ray diffraction, dc magnetization, ac magnetic susceptibility, and heat capacity measurements. The Mn/Co atomic order was controlled by annealing at some temperatures and successive quenching. The qual…
Abstract We performed the graft copolymerization of methyl acrylate and methyl methacrylate on cellulose acetate (CA) by a free‐radical method. The grafting was confirmed by gravimetric analysis and IR spectroscopy. Low graft efficiency was observed for the benzoyl peroxide initiator used in the system. Melt blending…
Abstract Polyblend fibrous scaffolds in mass ratios of 100/0, 90/10, 80/20, and 70/30 from poly( L ‐lactide) (PLLA) and poly(ϵ‐caprolactone) (PCL) for cartilage tissue engineering were prepared in three steps: gelation, solvent exchanging, and freeze‐drying. Effects of the blend ratio, the exchange medium, and the ope…
In situ neutron diffraction analysis was employed to study the behavior of the cathode and anode materials in a commercial Li-ion cell (Saehan Enertech, Inc) using the exact configuration of the commercial product. Accurate lattice parameters were refined for the type cathode based on measurements collected as a funct…
We study the interaction of external charged particles with the bulk and surface modes of cylindrical wires using classical and quantum mechanical formulations. First, the dielectric function approach is used to calculate the main induced effects and to derive the average number of excited plasmons in a semiclassical…
Abstract The ball milling of cellulose and maleic anhydride grafted polypropylene (MAPP) induced the formation of ester bonds between OH groups of cellulose and maleic anhydride groups of MAPP, in marked contrast to the melt mixing of the original cellulose and MAPP, through which the esterification was hardly observe…
The absorption spectra, redox behavior, and luminescence properties (both at 77 K in rigid matrices and at room temperature in fluid solution) of a series of [2x2] molecular grids have been investigated. The latter were prepared either by means of sequential self-assembly, or by a stepwise protection/deprotection proc…
This paper describes a general way permitting the quantitative introduction of strongly chelated transition metal ions. For that purpose, the direct synthesis of mesoporous silica containing chloropropyl groups has been achieved by using three different nonionic surfactants ( n -hexadecylamine, tergitol 15-S-12, and t…
This article describes the preparation of several new porphyrins bearing chelating peripheral groups fully conjugated with the macrocyclic pi-system. Treatment of a 2-nitro-meso-tetraarylporphyrin with phosphite gave a cyclic enamine, whose formylation gave an enaminoaldehyde. The thio analogue was obtained on treatme…
Three novel phosphorus-containing analogues of H(5)DTPA (DTPA = diethylenetriaminepentaacetate) were synthesised (H6L1, H5L2, H5L3). These compounds have a -CH2-P(O)(OH)-R function (R = OH, Ph, CH2NBn2) attached to the central nitrogen atom of the diethylenetriamine backbone. An NMR study reveals that these ligands bi…
We study the energetics of various point defects in silicon using ab initio density-functional methods. The formation free energies are calculated from the harmonic phonon frequencies, which are determined from ab initio density-functional perturbation theory calculations. We deduce the concentrations of defects as a…
Thin films of dodecanethiol-passivated Au and Ag nanocrystals drop cast from different solvents were examined by high-resolution scanning electron microscopy (HRSEM). C12-coated Au and Ag nanocrystals, 5-7 nm in diameter, form face-centered cubic (fcc) superlattices oriented with the (111)s planes (subscript s denotin…
Abstract Poly(trimethylene terephthalate) (PTT) was systematically studied as an engineering thermoplastics material. Crystallization rates, crystalline degrees, and mechanical properties of two commercial PTT polymers and one glass fiber–reinforced PTT compound were investigated and compared with those of poly(butyle…
Abstract Poly(lactic acid) (PLA) and poly(lactic‐ co ‐GA) (PLGA) with low molecular weights were synthesized by a one‐step polycondensation of lactic acid (LA) with glycolic acid (GA) molecules using stannous octoate as a catalyst at 160°C. A high yield (>80%) of all the polymers was obtained in the study. The PLA…
This Letter investigates the defect structures that arise between two colloidal spheres immersed in a nematic liquid crystal. Molecular simulations and a dynamic field theory are employed to arrive at molecular-level and mesoscopic descriptions of the systems of interest. At large separations, each sphere is surrounde…
The uptake of the three species of the drug model fluorescein (fluorescein sodium salt (FNa), fluorescein free acid (F), and fluorescein diacetate (FDA)) by zeolite NaX and the mesoporous zeotype MCM-41 was investigated as well as their release rates into solutions at pH 7 and pH 4.5. UV/Vis analysis was carried out a…
Abstract The surface of polydimethylsiloxane rubber (PDMS) was irradiated by a CO 2 ‐pulsed laser. The irradiated surfaces were grafted by hydroxyethylmethacrylate phosphatidylcholine (HEMAPC) by using the preirradiation method. The laser‐treated surfaces and HEMAPC‐grafted PDMS surfaces were characterized by using a…
Abstract The degradation of different polyethylenes—low‐density polyethylene (LDPE), linear low‐density polyethylene (LLDPE), and high‐density polyethylene (HDPE)—with and without antioxidants and at different oxygen concentrations in the polymer granulates, have been studied in extrusion coating processing. The degra…