Materials Literature
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The effect of the uptake of a low-molecular-weight amphiphilic diblock copolymer on the morphology of didodecyldimethylammonium bromide (DDAB) adsorbed layers on mica, the interactions between two coated surfaces, and the frictional properties of the boundary film have been studied using an atomic force microscope and…
We use molecular dynamics simulations to investigate the nucleation of calcite crystals on self-assembled monolayers. We show how the presence of bicarbonate ions adsorbed on the monolayer surface can both aid nucleation and control the orientation of the growth of the crystal. Using a simple model of the nucleation p…
Various morphology ZnO submicrorods and microrods have been fabricated onto glass substrates through chemical solution growth by the source of zinc acetate (Zn(CH 3 COO) 2 .2H 2 O) and hexamethylene tetraamine ((CH 2 ) 6 N 4 ). We discuss the influence of PH and the concentration of the solution on the shapes of the a…
We report a molecular dynamics study of a binary mixture consisting of a large (host) particle and a smaller (guest) particle whose radius is varied over a range. These simulations investigate the possible existence of a diffusion anomaly or levitation effect in dense fluids, previously seen for guest molecules diffus…
We present a differential theory for solving Maxwell equations in cylindrical coordinates, projecting them onto a Fourier-Bessel basis. Numerical calculations require the truncation of that basis, so that correct rules of factorization have to be used. The convergence of the method is studied for different cases of di…
Abstract Ring‐opening polymerization of L(D)‐lactide was realized in the presence of poly(ethylene glycol) (PEG), yielding PLLA/PEG and PDLA/PEG block copolymers. Bioresorbable hydrogels were prepared from aqueous solutions containing both copolymers due to interactions and stereocomplexation between PLLA and PDLA blo…
The synthesis, characterization, and various photophysical properties of axially substituted tetrapyrazinotetraazaporphyrinatotitanium(IV) oxide (Pyz(4)TAPTiO) (1), tetrapyrazinotetraazaporphyrinatovanadium(IV) oxide (Pyz(4)TAPVO) (2), tetrapyrazinotetraazaporphyrinatozirconium(IV) dihydroxide [Pyz(4)TAPZr(OH)(2)] (3)…
Mitomycin-C loaded and chitosan-coated alginate microspheres were prepared for use in chemoembolization studies. In this respect, first alginate microspheres were prepared by using a spraying method using an extrusion device with a small orifice and following suspension cross-linking in an oil phase. Chitosan-coating…
A monolayer of inorganic nanoparticles (NPs) was fabricated on a silicon wafer using a cage-shaped protein, ferritin, which can sequester several kinds of inorganic NP in their cavities. Ferritins were bound electrostatically in aqueous condition to the silicon wafer which was modified with aminosilane molecules. The…
Linear and nonlinear optical properties of Ge33As12Se55 pulsed-laser-deposited (PLD) films are presented. The effect of exposure on these films is investigated in some detail. The PLD films showed photobleaching as a result of exposure to 610-nm laser light. Degenerate four-wave mixing and Z-scan techniques were used…
A time-dependent gas-phase isovolumetric desorption technique has been used to evaluate the diffusive transport parameters of hydrogen isotopes in polycrystalline tungsten in the temperatures range 673 to 1073 K and driving pressures from 1.3 104 to 105 Pa. Experiments have been run with both protium and deuterium obt…
The polymorphism and anisotropy of electrical, dielectric, and thermophysical properties of “pure” and doped LiIO3 single crystals are studied. The hexagonal a-LiIO3 phase is a 1-D ionic conductor (along the c axis). The anisotropy of the ionic conductivity of the a-phase can be reduced by doping with transitive metal…
Abstract Nonlinear growth behavior was observed in two crystallization regimes, depending on the temperature. Non-linearity may be explained by the reduction of the concentration of crystallizable ethylene sequences (CES) in the melt phase. In the two regimes, the concentration of uncrystallizable ethylene sequences (…
The inhibitive action of 3-amino-1,2,4-triazole (ATA) on 70Cu-30Zn alloy corrosion in HNO 3 0,5M was examined. Gravimetric and electrochemical tests were used. The results obtained show that the ATA reduces effectively the dissolution of 70Cu-30Zn alloy. The inhibition efficiency in aerated acid increased with increas…
Many properties of lyocell fibers are markedly different from those of other cellulosic fibers. Hence, it is necessary to study Lyocell wet processing to determine and characterize variables that have a significant influence on the properties of finished products. At the Christian-Doppler Laboratory, we are conducting…
Europium nitride (EuN), which is potentially used as an activator for nitride luminescent materials, was prepared by direct nitridation at 600 °C in a NH 3 atmosphere. X-ray powder diffraction and composition analysis of the nitrided sample were carefully conducted under an oxygen-free environment. The nitrided sample…
Abstract For the purpose of construction of the hydrogen-bonded and coordination-bonded supramolecular network, MnII complex bridged by squarate molecules was synthesized, and their structural and magnetic properties were studied. X-ray structure determination revealed that MnII complex, [MnII4(C4O4)4(C4H4N2)(H2O)8],…
Infrared-absorption spectroscopy and electron spin resonance are used to study the role of boron impurity in the activation of free charge carriers in layers of porous silicon that have been exposed to nitrogen dioxide acceptor molecules. It is found that the higher the level of doping is for the substrates used in th…
The nonpathogenic strain Arthrobacter nicotianae produces two sialidase isoenzymes, NA1 and NA2, with molecular masses of 65 kDa and 54 kDa, respectively, as determined by 10% SDS-polyacrylamide gel electrophoresis. NA1 and NA2 exhibit maximum activities at pH 4 and 5, and both show clear thermal optima at 40 degrees…
We synthesized europium-activated yttrium phosphovanadate (Y(P,V)O 4 :Eu 3+ ) red phosphor, which is expected to be applicable in plasma display panels, by spray pyrolysis. The effect of pyrolysis temperature on luminescence characteristics was clarified and the mechanism of this effect is discussed. A precursor solut…