Materials Literature
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We report on a photocrystallography investigation of the photoinduced phase transition in the Tris(\ensuremath{\alpha}-picolylamine)iron(II) chloride-ethanol complex. X-ray diffraction data show the structural rearrangement at the atomic scale accompanying the photosteady change of electronic state between the low-spi…
Summary The adsorption of phosphate by soil minerals controls availability of P to plants, but the chemical environments of adsorbed phosphate are poorly known. We used 31 P MAS NMR to study the adsorption of phosphate on to boehmite (γ‐AlOOH) and γ‐Al 2 O 3 with large surface areas. The solid phases were reacted in 0…
We describe a new means for electrically creating spin polarization in semiconductors. In contrast to spin injection of electrons by tunneling through a reverse-biased Schottky barrier, we observe spin accumulation at the metal/semiconductor interface of forward-biased ferromagnetic Schottky diodes, which is consisten…
Synchrotron-X-ray and surface tension studies of a strong polyelectrolyte (PE) in the semi-dilute regime (~ 0.1M monomer-charges) with varying surfactant concentrations show that minute surfactant concentrations induce the formation of a PE-surfactant complex at the gas/solution interface. X-ray reflectivity and grazi…
New mechanism of magnetoresistance, based on tunneling-emission of spin polarized electrons from ferromagnets (FM) into semiconductors (S) and precession of electron spin in the semiconductor layer under external magnetic field, is described. The FM-S-FM structure is considered, which includes very thin heavily doped…
Summary In some soils, aggregate coatings and walls of biopores differ in the content of clay and organic carbon from that of the aggregate interiors or the soil matrix. The composition of the organic matter on aggregates and on the surfaces of biopores is largely unknown. We have compared the composition of organic m…
On the basis of Friedel approach the theoretical description of the effects of resonance scattering of conduction electrons by donor impurities in semiconductors with allowance for the stabilization of electron concentration in coinciding the Fermi energy with the resonance level energy has been developed. It has been…
Dynamics of a one-dimensional growing front with an unstable straight profile are analyzed. We argue that a coarsening process occurs if and only if the period λof the steady state solution is an increasing function of its amplitude A. This statement is rigorously proved for two important classes of conserved and nonc…
This study reports the effect of a change in crystal form on the quality of interactive mixtures prepared with homogenous sugar beads and the three polymorphs of chloramphenicol palmitate (CAP). Six mixtures containing micronized CAP polymorph powder (0.5%) and sugar beads (99.5%) were mixed in a Turbula mixer at 27 r…
Complexation between poly(methyl vinyl ether-maleic anhydride) copolymer (Gantrez AN 169) and polyvinylpyrrolidone (PVP K-90D) in aqueous solutions were investigated using a viscometric method and Raman spectroscopy. The composite films with different weight ratios of PVP to Gantrez were prepared in the presence of N-…
The aim of this work is to evaluate the feasibility of hydrophilic silica aerogels as drug carriers and to investigate the influence of the aerogels properties on the release rate of poorly water-soluble drugs. Hydrophilic silica aerogels of different densities were loaded with two model drugs, ketoprofen and griseofu…
The title compound, octa-tert-butoxybis[micro(3)-2,2'-(N-methylimino)diethanolato]di-micro-oxo-tetratitanium(IV), [Ti(2)O[(OCH(2)CH(2))(2)(NCH(3))][(CH(3))(3)CO](4)](2) or [Ti(4)(C(5)H(11)NO(2))(2)(C(4)H(9)O)(8)O(2)], lies about an inversion centre, and displays the less usual zigzag configuration. One O atom of the N…
Polyurethane (PU) foam was hydrolytically depolymerized in 0.5 L capacity high-pressure autoclave equipped with magnetic stirrer at 100, 130, 150, 170, 200, and 220°C and at 15, 51, 80, 153, 230, and 405 psi pressures. The percentage conversion of PU foam to polyamines and polyols on the basis of amine value and hydro…
Chloroprene rubber was blended with whole tire reclaimed rubber (WTR) in presence of different levels of a coupling agent Si69 [bis-(3-(triethoxysilyl)propyl)tetrasulfide] and the cure characteristics and mechanical properties were studied. The rate and state of cure were also affected by the coupling agent. While the…
The infrared spectra of xanthated cellulose and its blends with polyvinyl alcohol (PVA) in different ratios were investigated. The dielectric constant, loss tangent, and AC-conductivity of the prepared blends were measured at different temperatures (293–373K) in the frequency range (100 Hz–5 MHz). The decrease in the…
The haptotropic rearrangement of diiron carbonyl species on the conjugate π-ligand in (μ 2,η 3:η 5 -acenaphthylene)Fe 2 (CO) 5 ( 1 ) and its analogue (μ 2,η 3:η 5 -aceanthrylene)Fe 2 (CO) 5 ( 2 ) is investigated in both solution and solid states. The diiron complexes 1 and 2 have two isomers, and each isomer is isolat…
Thermodynamic perturbation theory is used to calculate the free energies and resulting phase diagrams of binary systems of spherical colloidal particles and interacting polymer coils in a good solvent within an effective one-component representation of such mixtures, whereby the colloidal particles interact via a poly…
Glasses from the two systems, x Fe 2 O 3 · (100-x)[ P 2 O 5 · CaO ] and x( Fe 2 O 3 · V 2 O 5 ) · (100-x)[ P 2 O 5 · CaO ] with 0 ≤ x ≤ 50 mol% were prepared under the same conditions and characterized by IR spectroscopy. The way in which Fe 2 O 3 and ( Fe 2 O 3 · V 2 O 5 ) influences the local structure of these glas…
This study evaluates the effect of uv/ozone treatments as a source of surface modifications on the properties of some polymeric fabrics. Thus, pure wool, pure polyester, and blended (wool/polyester 65/35%) fabrics are treated with uv/ozone for different time periods (1, 3, 5, 10, 15, and 20 min). The treated samples a…
End-capped poly(L-lactide) (PLLA) samples with dodecyl or 2-(2-(2-methoxyethoxy)ethoxy)ethyl (MEEE) ester were synthesized by ring-opening polymerization of L-lactide in the presence of zinc dodecanoxide or zinc 2-(2-(2-methoxyethoxy)ethoxy)ethoxide as a catalyst, respectively. On the basis of NMR analysis, it was con…