Materials Literature
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Within the last five years, investigators using NMR and forced Raleigh scattering techniques have found that the Stokes–Einstein (S–E) relation breaks down in supercooled liquids. It has been pointed out that the shear viscosity has a significantly stronger temperature dependence than either the self-diffusion coeffic…
ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTPhotocatalytically Deposited Silver Nanoparticles on Mesoporous TiO2 FilmsElias Stathatos, Panagiotis Lianos, Polykarpos Falaras, and A. SiokouView Author Information Engineering Science Department, University of Patras, 26500 Patras, Greece Institute of Physical Chemistry, NCS…
The oxidative modification of methionines within the primary sequence of calmodulin (CaM) results in an inability to activate the PM-Ca-ATPase fully, and may contribute to alterations in calcium homeostasis under conditions of oxidative stress. To identify differences in the sensitivities of CaM isoforms to oxidative…
Escherichia coli CsdB, a NifS homologue with a high specificity for L-selenocysteine, is a pyridoxal 5'-phosphate (PLP)-dependent dimeric enzyme that belongs to aminotransferases class V in fold-type I of PLP enzymes and catalyzes the decomposition of L-selenocysteine into selenium and L-alanine. The crystal structure…
The condensation polymerization in a methanol solution of four different esterified aldaric acids (D-glucaric, meso-xylaric, meso-galactaric, and D-mannaric) with even-numbered alkylenediamines (C2–C12) gave polyhydroxypolyamides whose water solubilities and melting points were compared. In general, an increase in the…
The surfaces of standard untreated polystyrene cell culture dishes have been oxidatively modified for up to 8 min exposure time using an ultraviolet ozone treater in order to promote cell adhesion. Surface oxygen chemisorption and topographical modification has been characterized using monochromatic X-ray photoelectro…
Two-dimensional X-ray diffraction (XRD) analyses of transparent mesoscopically ordered silica/block copolymer composite monoliths reveal single-crystal-like patterns that correspond to well-ordered hexagonal domains that are greater than 1 cm × 1 mm × 1 mm in size. Analyses of the diffraction patterns reveal highly un…
We propose a new method to calculate expectation values of a delta function of the Hamiltonian, < Ψ\mid δ(\hat{H} - E)\mid Ψ>. Since the delta function can be replaced with a Gaussian function, we evaluate < Ψ\mid \sqrt{\fracβπ} e^{-β(\hat{H} - E)^2} \mid Ψ> with large βadopting the Suzuki-Trotter decomposition. Error…
We present results of computer simulations of amorphous Si3B3N7 ceramics. The computed pair correlation functions are in agreement with the experimental results. Regarding the structural properties of the B-N, Si-N and N-Si/B coordination spheres, our results are in full agreement with experimental data. We confirm th…
A doubly N-confused porphyrin (N 2 CP), 2-ethoxy-5,10,15,20-tetrapentafluorophenyl-3,7-diaza-21,22-dicarbaporphyrin, and its Ag(III) and Cu(III) complexes were synthesized for the first time, via an acid-catalyzed condensation of pentafluorobenzaldehyde and meso -pentafluorophenyl-2,3‘-dipyrromethane. 1 H NMR and sing…
Mesostructured silica waveguide arrays were fabricated with a combination of acidic sol-gel block copolymer templating chemistry and soft lithography. Waveguiding was enabled by the use of a low-refractive index (1.15) mesoporous silica thin film support. When the mesostructure was doped with the laser dye rhodamine 6…
The principal value of polyethylene lies in its desirable balance of physical properties in the solid state and its chemical inertness. These qualities in combination with its low cost and ready processability make it the material of choice for a wide variety of uses. The balance of physical properties can be controll…
Self-diffusion and tracer diffusion (diffusion in a fixed diblock copolymer matrix) of ABA triblock copolymers of styrene and 2-vinylpyridine (PVP-PS-PVP) have been measured in a spherically ordered domain structure and compared to that of diblock copolymers. In most of the cases, the self-diffusion and tracer diffusi…
ADVERTISEMENT RETURN TO ISSUECommunication to the...Communication to the EditorNEXTCompetition between Liquid Crystalline Phase Symmetry and Microphase Morphology in a Chiral Smectic Liquid Crystalline−Isotropic Block CopolymerArmin Schneider, Jean-Jacques Zanna, Masayuki Yamada, Heino Finkelmann, and Ralf ThomannView…
Precipitation of CdS in Starburst PAMAM dendrimer solutions offers a viable method of preparing CdS nanoclusters with long-term optical stability. Photoluminescence and UV−visible spectroscopy data show that the dendrimer stabilizes the precipitated CdS as nanoclusters with characteristic optoelectronic properties not…
The goal of the current study is to measure the strength of specific adhesion between a prototypical phospholipid-stabilized ultrasound contrast agent, the surface of which has been derivatized with a ligand molecule, and a glass bead surface coated with the corresponding receptor. In particular, the role of surface “…
This paper focuses on the growth mechanism of the multiwalled carbon nanotubes exhibiting helical and zigzag growth morphologies. Our data support a kinetically controlled growth model in which the creation rates of the pentagon and heptagon carbon rings determine the geometrical shapes of the nanotubes. The carbon na…
The effect of difluorocarbene (CF 2 ) modification on the self-assembly of polystyrene- b -polyisoprene (PS- b -PI) copolymers was investigated. We prepared a set of fully CF 2 -modified PS- b -PI copolymers (PS- b -FPI) with different molecular weights (8−13 kg/mol) and located their order−disorder transition tempera…
The structure of adsorbed octa(oxyethlyene) n -dodecyl ether (C 12 E 8 ) layers at a series of gold−alkanethiolate surfaces was investigated by atomic force microscopy. The hydrophobicity of the surfaces was systematically varied by changing the relative amounts of chemisorbed thiohexadecane (CH 3 (CH 2 ) 15 SH) and t…
To study the influence of PEO on the relaxation process of PMMA, the real and imaginary parts of the permittivity, ε‘ and ε‘ ‘, of PEO/PMMA blends (with PEO contents up to 25 wt %) were measured as a function of frequency and temperature, and the results obtained were compared with those of pure PMMA. It is shown that…