Materials Literature
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Sulfonated poly(ethylene oxide) (PEO)-grafted polyurethane (PU) (PU-PEO-SO(3)) prepared by bulk modification was used to coat both PU heart valves and vascular grafts, and their in vivo biocompatibility was evaluated using a canine shunt method. The two devices were implanted for up to 39 days and retrieved at specifi…
The radioluminescence (RL) properties of Ce-doped silica glasses prepared by sol−gel method were investigated as a function of the dopant amount in a wide range of concentrations (Ce:Si molar ratios from 1 × 10 - 5 to 5 × 10 - 2 ). The effects of xerogel densification temperature and of a postdensification thermal tre…
In this work we used quantum mechanics hybrid models (QM/QM) to investigate the high-temperature polymerization of styrene with the aim of elucidating its elementary chemistry. High and low quality quantum mechanics calculations were performed at the B3LYP/6-31g(d,p) and PM3 levels, respectively. Reaction kinetic cons…
Two different synthetic routes were used to synthesize three nanostructured cerium (IV) oxide powders: Two samples were obtained by precipitation from a basic solution of cerium nitrate and treated at 523 and 923 K, respectively, the third one was prepared by a microwave-assisted heating hydrolysis method and treated…
Low temperature photoluminescence and optical absorption studies on 200MeV Ag+15 ion irradiated Co-implanted ZnO thin films were studied. The Co clusters present in as implanted samples were observed to be dissolved using 200MeV Ag+15 ion irradiation with a fluence of 1×1012ions∕cm2. The photoluminescence spectrum of…
We have investigated the effect of hydrogen on the resistivity, Hall mobility, and carrier density of ITO films on glass substrates using a low-pressure plasma sputtering method. It was found that a certain hydrogen content in the Ar plasma leads to improvement in the resistivity relating to an increase in the electro…
A self-consistent dynamic model allowing the prediction of AC discharge activities leading to flashover on ice-covered insulator surface is presented. This model takes into account the effects of a number of parameters including insulator geometry and applied water conductivity. The instantaneous variations of major p…
A new scorpionate ligand [HB(mtda)3-] containing mercaptothiadiazolyl (mtda) heterocyclic rings with both hard nitrogen donors and soft sulfur donors has been prepared. This new ligand, the Janus scorpionate, is a hybrid of a tris(pyrazolyl)borate and a tris(mercaptoimidazolyl)borate. The differential hard/soft charac…
We present the electronic structures, magnetic exchange interactions and Curie temperature (TC) of GaMnN and GaMnAs calculated by self-interaction-corrected local-density approximation (LDA-SIC). In GaMnAs, the LDA-SIC results of TC do not differ so much from the LDA results. Both the LDA and LDA-SIC values are in a g…
Four analogues of the narrow band gap poly(3,4-propylenedioxythiophenedialkyl)cyano- p -phenylenevinylene (PProDOT−R 2:CNPPV) polymer family have been designed with the goal of improving the film forming ability and utility of this family of polymers when applied in redox switchable and optoelectronic devices. These p…
We report the use of Fourier transform polarization modulation infrared reflection-absorption spectroscopy (PM-IRRAS) to characterize the influence of dimethyl methylphosphonate (DMMP) on the molecular interactions occurring within thin films of nitrile-containing liquid crystals supported on surfaces presenting metal…
Abstract Summary: A polymer‐iron oxide nanocomposite film has been successfully synthesized by using a microporous regenerated cellulose film as template and aqueous ferrous chloride as precursor. The nanocomposite film was investigated with XRD, XPS, SEM, TEM, and VSM. The nanoparticles synthesized in situ were disk‐…
Novel biodegradable and biocompatible block copolymers of poly(ε-caprolactone) (PCL) and polyphosphoester were prepared in tetrahydrofuran by a two-step sequential ring-opening polymerization of ε-caprolactone and 2-methoxyethyl ethylene phosphate (MOEEP) using aluminum isopropoxide as an initiator. Kinetics studies r…
Two derivatives of the highly nonlinear optical crystal DAST (4- N, N -dimethylamino-4‘- N ‘-methyl-stilbazolium tosylate) with m -trifluoromethylbenzene-sulfonate (DSMFS) and p -trifluoromethylbenzenesulfonate (DSPFS) replacing the p -toluenesulfonate of DAST have been synthesized and characterized. X-ray crystallogr…
Relaxation processes associated with the glass transition in nonferroelectric and ferroelectric polyamide (PA) 11 are investigated by means of differential scanning calorimetry, dynamic mechanical analysis, and dielectric relaxation spectroscopy (DRS) in order to obtain information about the molecular mobility within…
A series of polycrystalline ferrite samples with the compositionMnxZn1-xFe2O4 (x=0.0, 0.25, 0.5, 0.75, and 1.0) were prepared by the standardceramic method. X-ray diffraction pattern confirm the existence of single phaseof cubic spinel crystal structure with the lattice parameter ranges from 8.419Å(for ZnFe2O4) to 8.4…
Abstract Summary: Some natural fibres like flax, hemp and others show excellent mechanical properties which make them a promising choice for the reinforcement of polymers. For natural fibre reinforced composites, hydrophilicity is a problem with respect to dimensional changes, fibre to matrix adhesion and long term st…
Single-walled carbon nanotubes (SWNTs) exhibit unique thermal and electrical conductivity and high mechanical strength. The ability to effectively functionalize the SWNT surface and control their dispersion in a polymer matrix will be crucial to exploit their physical properties in nanocomposites. Here we report the f…
Culturing cells in 3-dimensional (3D) systems is important in tissue engineering and in fundamental studies of cellular mechanisms that are sensitive or specific to the 3D environment. To guide the engineering of artificial vocal fold lamina propria tissue, we developed 3D cultures containing human vocal fold fibrobla…
We report the field-emission properties of ultrathin tungsten nanowires of 5nm diameter and several hundred nanometer length. Fowler-Nordheim plots of field-emission current-voltage measurements of such nanowires show marked deviation from linearity. After flashing, cold-field-emission current stability with standard…