Materials Literature
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Poly(vinylpyrrolidone) (PVP) is a polymer capable of complexing and stabilizing Ag and Au nanoparticles formed through the reduction of Ag + or AuCl 4 - ions with N, N -dimethylformamide. The reduction can be efficiently performed both at reflux and under microwave irradiation, but each of these methods leads to diffe…
This work reports the supercapacitive properties of electrochemically grown composite films of multiwalled carbon nanotubes (MWNT) and polypyrrole (PPy), a conducting polymer. Scanning electron microscopy, cyclic voltammetry, and electrochemical impedance spectroscopy revealed that the nanoporous three-dimensional arr…
The reaction of Cu(ClO(4))(2) x 6H(2)O, NaAsF(6) and excess pyrazole yields hexakis(pyrazole-kappa N(2))copper(II) bis(hexafluoroarsenate), [Cu(C(3)H(4)N(2))(6)](AsF(6))(2) or [Cu(pzH)(6)](AsF(6))(2) (pzH is pyrazole), (I). The analogous hexakis(pyrazole-kappa N(2))copper(II) hexafluorophosphate perchlorate complex, […
In recent years, drug release/dissolution from solid dosage forms has been the subject of intense and profitable scientific developments. Whenever a new solid dosage form is developed or produced, it is necessary to ensure that drug dissolution occurs in an appropriate manner. The pharmaceutical industry and the regis…
We discuss the ideal glass transition for two types of potential model of attractive colloidal systems, i.e. the square-well system and the Yukawa hard-sphere fluid. We use the framework of the ideal mode-coupling theory and we mostly focus our attention on the nature of the singularities predicted by the theory. We a…
Vibrational properties of ferrocyanide complex ion, <TEX>$[Fe(CN)_6]^{4-}$</TEX> , have been studied based on the force constants obtained from the density functional calculations at B3LYP/<TEX>$6-31G^{\ast\ast}$</TEX> level by means of the normal mode analysis using new bond angle and linear angle internal coordinate…
The energy relaxation dynamics of the lowest excited singlet and triplet states of the Zn(II)porphyrin monomer and its directly linked arrays were comparatively investigated with increasing the number of porphyrin moieties. While the fluorescence decay rates and quantum yields of the porphyrin arrays increased with th…
Abstract Sulphate scale deposition is a common problem in hydrocarbon reservoirs where injection seawater, rich in sulphate, mixes with formation brines, rich in barium, strontium and calcium. The deposition of these scales can cause significant production impairment if it occurs within zones near the production wellb…
The elastic analysis of a mode II Griffith crack penetrating through a decagonal quasi-crystal along the periodic axis is made within the context of the continuum theory. By using a general solution obtained previously, the problem in the case of uniform shear stress at infinity is solved and the analytical expression…
Abstract Formic acid is present in some corrosion inhibitors and is used as an intensifier in the acid treatment of oil and gas wells. This organic acid is important for the protection of low-carbon steels from acid corrosion at high temperatures and pressure. In this paper, the fate of formic acid used during acid tr…
The ferromagnetic phase of ${\mathrm{La}}_{0.6}{\mathrm{Sr}}_{0.4}{\mathrm{MnO}}_{3}$ thin films has been investigated through measurements of magnetization loops at different temperatures, zero-field-cooled and field-cooled magnetization curves obtained under different magnetic fields. We have found that the main sou…
We write equations of motion for density variables that are equivalent to Newton's equations. We then propose a set of trial equations parametrized by two unknown functions to describe the exact equations. These are chosen to best fit the exact Newtonian equations. Following established ideas, we choose to separate th…
The magnetic and transport properties of the layered manganites ${\mathrm{La}}_{1.4}{\mathrm{Sr}}_{1.6}{\mathrm{Mn}}_{2\ensuremath{-}y}{\mathrm{Ti}}_{y}{\mathrm{O}}_{7}$ $(y<~0.10)$ are investigated. For the undoped and doped samples, magnetization and electron-spin-resonance experiments exhibit coexistence of the…
Taking advantage of the multifunctional characteristics of carbazole along with rational molecular design, a two-dimensional carbazole chromophore with strong nitro acceptors was synthesized by a facile synthetic route. A first molecular hyperpolarizability of 163 × 10−30 esu was acquired through solvatochromic method…
We study numerically and analytically a simple off-lattice model of scalar harmonic vibrations by means of Euclidean random matrix theory. Since the spectrum of this model shares the most puzzling spectral features with the high-frequency domain of glasses (non-Rayleigh broadening of the Brillouin peak, boson peak and…
The stability of a one-component model system interacting through an isotropic potential with an attractive part and a softened core is investigated through integral equations and molecular dynamics simulation. The ‘penetrability ’ of the soft core makes it possible for the system to pass from an expanded liquid struc…
A novel fitting function for the complex frequency-dependent dielectric susceptibility is introduced and compared against other fitting functions for experimental broadband dielectric loss spectra of propylene carbonate taken from Schneider et al (Schneider U, Lunkenheimer P, Brand R and Loidl A 1999 Phys. Rev. E 59 6…
Abstract An extensive research programme was launched with the aim at evaluating the potential of seven different polyamino carboxylic acids (PACAs) using both technical and economic aspects. Dissolving capacity of each compounds was determined under equilibrium conditions as a function of concentration for barite and…
The synthesis and structures of indium complexes incorporating the bidentate monoanionic ligand N, N ‘ -diisopropylaminotroponiminate ( i Pr 2 -ATI) are described. The reaction of InCl 3 with Li[ i Pr 2 -ATI] yields ( i Pr 2 -ATI)InCl 2 ( 3 ), which is converted to ( i Pr 2 -ATI)InMe 2 ( 4 ) by reaction with MeLi; 4 i…
Amorphous <TEX>$Ga_2O_3$</TEX> films have been grown on Si(100) substrates by metal organic chemical vapor deposition (MOCVD) using gallium isopropoxide, <TEX>$Ga(O^iPr)_3$</TEX>, as single precursor. Deposition was carried out in the substrate temperature range 400-800 <TEX>$^{\circ}C$</TEX>. X-ray photoelectron spec…