Materials Literature
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This paper is devoted to investigating the physically interesting optical and electromagnetic properties, phenomena and effects of wave propagation in the negative refractive index materials, which is often referred to as the {\it left-handed media} in the literature. This paper covers a wide range of subjects and rel…
Abstract Poly(vinyl alcohol‐ co ‐vinyl acetate) was functionalized by methacrylic anhydride to introduce functional groups by a new process that consisted of modifying a polymer directly from a powder form in the solid state. To favor the diffusion of the reagents, a swelling agent composed by a mixture of ethylene ca…
Measurements of bulk conductivity and dielectric relaxation processes by ac methods including complex-plane impedance analyses have been carried out on insulating , together with measurements of four-probe dc conductivity and magnetic susceptibility, so as to investigate the correlation between bulk conduction and sho…
The formation of biocomposite films of the industrially important enzyme invertase and fatty lipids under enzyme-friendly conditions is described. The approach involves a simple beaker-based diffusion protocol wherein invertase diffuses into the cationic lipid octadecylamine during immersion of the lipid film in the e…
Understanding the deposition of liquid droplets on surfaces is essential in many environmental and industrial processes. In this paper, we describe computer simulations of homogeneous deposition of liquid droplets on an ideal, smooth, and horizontal solid surface. The statistical evolution of droplet deposition and gr…
The effect of temperature and glucose binding on the structure of the galactose/glucose-binding protein from Escherichia coli was investigated by circular dichroism, Fourier transform infrared spectroscopy, and steady-state and time-resolved fluorescence. The data showed that the glucose binding induces a moderate cha…
In this report new PPV-PPE copolymers <b>DE 69, DE 11</b> were compared with the state of the art materials <b>MDMO-PPV</b> and poly(3-alkylthiophenes) (<b>P3DDT, P3OT</b>). The optical band gap energy of the two copolymers <b>DE 69, DE11</b> is somewhat higher than that one of <b>MDMO-PPV</b>. The electrochemical ban…
Mixed surfactant-polyelectrolyte multilayer films were fabricated by both ionic self-assembly and spin assembly. A polycation [PEI = poly(ethylenimine)] was deposited from a dilute solution, while a polyanion (PAZO = poly[1-[4-(3-carboxy-4-hydroxyphenylazo) benzenesulfonamido]-1,2-ethanediyl, sodium salt]) was deposit…
Atomic force microscopy (AFM) has been used to investigate the displacement of a commercial whey protein system and the behavior as compared to that of beta-lactoglobulin (Mackie, A. R.; Gunning, A. P.; Wilde, P. J.; Morris, V. J. Orogenic displacement of protein from the air-water interface by competitive adsorption.…
Highly aligned stringlike silica nanostructures are obtained through templated synthesis in the columnar hexagonal structure of a rigid crystalline surfactant mesophase. A two-step procedure is used to first shear-align the surfactant mesophase and then conduct synthesis under quiescent conditions in the mesophase. Th…
A new natural-synthetic hybrid biomaterial has been isolated from the growth of Pseudomonas oleovorans in the presence of diethylene glycol (DEG). DEG was consumed by P. oleovorans with 20 mM sodium octanoate in modified E* medium, but its presence in the fermentation medium retarded cell growth and viability, influen…
Abstract The influence of para ‐, ortho ‐, and meta ‐phenylenediamine ( p ‐, o ‐, and m ‐PDA) additions on the electrochemical synthesis of polyaniline has been investigated by the use of cyclic voltametry. It has been found that small additions (1 and 5 mmol L −1 ) of PDA monomers influence significantly the polymeri…
${\mathrm{Ga}}_{1\ensuremath{-}x}{\mathrm{Mn}}_{x}\mathrm{As},$ $x=0.043,$ has been grown ex situ on GaAs(100) by low-temperature molecular-beam epitaxy. On the reprepared $p(1\ifmmode\times\else\texttimes\fi{}1)$ surface, resonant photoemission of the valence band shows a 20-fold enhancement of the Mn $3d$ contributi…
Several important properties of poly(3-hydroxybutyric-co-3-hydroxyvaleric acids) (P(3HB-co-3HV) depend mainly on the HV unit fraction of the copolymer. Sequential and simultaneous feeding of glucose and valerate were employed to produce P(3HB-co-3HV) in a fed-batch culture of Ralstonia eutropha, and the effects of fee…
N-confused 5,20-diphenylporphyrin (NCDPP, 1) formed 2:2 dimer complexes with group 12 metals both in the solid state and in solution. X-ray single-crystal analyses of the Zn(II) and Cd(II) complexes (7, 8) revealed that each metal ion is coordinated with three inner core nitrogens and a peripheral nitrogen of the othe…
We report on the room-temperature hole-mediated ferromagnetism in Zn 1- x Mn x O thin films. Zn 1- x Mn x O ( x = 0.03 and 0.20) films were prepared on GaAs (001) substrates by the rf magnetron cosputtering method. At the substrate temperature high enough to activate As diffusion from GaAs substrates, p-type Zn 1- x M…
We study the electric-field induced capillary interaction of charged particles at a polar interface. The algebraic tail of the electrostatic pressure of each charge results in a deformation of the interface u approximately r(-4), where r is the lateral distance. The capillary interaction of nearby particles is repulsi…
Magnetic field dependence of magnetization of poly(phenyl)acetylene which is known to show spin-glass-like behavior was studied at temperatures between 2 K and 300 K. Peculiar dependence of magnetization on the history of applied magnetic field, particularly the number of measurement cycles, is reported. The origin of…
In contrast to widely accepted view that pressure-induced amorphization arises due to kinetic hindrance of equilibrium phase transitions, here we provide evidence that the metastable pressure-amorphized state in zirconium tungstate is a precursor to decomposition of the compound into a mixture of simple oxides. This i…
The Cu 2+ -exchanged NaY, HY, USHY, Hβ, and HZSM-5 zeolites were prepared and evaluated in phenol hydroxylation with hydrogen peroxide using an atmospheric batch reactor. CuNaY, CuHY, and CuHβ catalysts were found to be more active than TS-1 or a simple homogeneous copper nitrate catalyst under similar reaction condit…