Materials Literature
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The doping of polyaniline has been achieved by introducing the dopant molecule into the solid, undoped polymer without the use of an auxiliary solvent. Complex formation in the solid phase occurs at elevated temperatures and results in the formation of a soluble and processable conducting complex. The complexation was…
The Cahn-Hilliard equation is a nonlinear evolutionary equation that is of fourth order in space. In this paper a linearized finite difference scheme is derived by the method of reduction of order. It is proved that the scheme is uniquely solvable and convergent with the convergence rate of order two in a discrete <in…
Reaction of a silicon trialkoxide with magnesium or nickel chloride leads to a new polymer in which organic side chains are linked to a phyllosilicate-like framework through Si–C covalent bonds.
The complex formation between Concanavalin A (Con A) and a polymer having pendant glucose groups was studied in order to design a glucose-sensitive polymer. The polymer having pendant glucose (poly(glucosyloxyethyl methacrylate) or (poly(GEMA)) forms a complex with Con A in tris HCl buffer (pH = 7.5). The solution the…
The effects of Cu substitution on the properties of NiZn ferrites sintered at low temperature with various compositions are investigated. The densification of NiCuZn ferrite is dependent upon Cu content in the composition, (Ni/sub 0.5-x/Cu/sub x/Zn/sub 0.5/)(Fe/sub 2/O/sub 3/)/sub 0.98/. Dispersion characteristics of…
Abstract A pH‐stat MSMPR crystallizer is used to obtain the nucleation rate equation of calcite formed in the Na 2 CO 3 ‐CaCl 2 reacting system. The experiments are conducted for seeded and unseeded runs. Effects of breakage and agglomeration on the crystalsize distribution are demonstrated. In a continuous operation,…
The graphene layers at carbon nanotube cap regions are efficiently cleaved by several oxidants (e.g., KMnO4, OsO4 and RuO4) in acidic solution at 100 °C, but not by stronger oxidants, such as K2Cr2O7–H+ and H2O2–H+.
A series of experiments in sea water at different hydrostatic pressures (from 1 to 300 bar) was carried out on some stainless steels containing different amounts of Cr, Ni, and Mo to investigate whether these elements and the hydrostatic pressure could affect the composition of tlte corrosion layer formed in sea water…
The formation, properties and applications of anisotropic, predominantly liquid-crystalline (LC), networks are described. These self-assembling systems exhibit macroscopic anisotropic (sometimes non-centrosymmetric) orientation in electric or magnetic fields, under strain or on orientation layers stabilised thermally…
Poly(L-lysine) was reacted with spiropyran reagents to give polypeptides containing 46 and 25 mol % spiropyran units in the side chains. The resulting modified polymers were soluble in hexafluoro-2-propanol (HFP), where they exhibited reverse photochromism. In pure HFP, the photochromic polymers were random coils and…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFull Multiple Scattering and Crystal Field Multiplet Calculations Performed on the Spin Transition FeII(phen)2(NCS)2 Complex at the Iron K and L2,3 X-ray Absorption EdgesV. Briois, Ch. Cartier dit Moulin, Ph. Sainctavit, Ch. Brouder, and A.-M. FlankCite this: J. Am. Chem. So…
Abstract Comparison of oxygen and nitrous oxide indices indicates that ammonium polyphosphate (APP) should act in the condensed phase when added to nylon 6 (PA‐6). A detailed study of the thermal degradation mechanism of PA‐6/APP mixtures is carried out. A polyphosphate ester is formed on heating, which is the precurs…
Abstract The isoconversional method was used to elucidate the kinetics of reversible solid‐state reactions occurring under nonisothermal linear heating. The characteristic dependencies of the effective activation energy (E) on the extent of conversion (W) were established for two model processes: a reversible first‐or…
The solution conformation of methyl alpha-lactoside has been studied through nmr spectroscopy and molecular mechanics calculations using the assisted model building with energy refinement (AMBER) force field. The nmr data have included nuclear Overhauser effect (NOE) measurements both in the laboratory and rotating fr…
A variational approach based on the Gibbs-Bogoliubov inequality is used in order to evaluate the free energy of simple fluids described by a double-Yukawa pair potential. A hard-sphere reference fluid is used to describe the fluid phases, and an Einstein reference crystal to describe the solid phases. Apart from the u…
During the past 5 years, important advances have been accomplished in the understanding of the fate of aliphatic polyesters derived from lactic acid (LA) and glycolic acid (GA) in aqueous media. Hydrolysis of solid LA/GA polymers is now regarded as dependent upon a diffusion-reaction mechanism. Faster central degradat…
Silicon-based, light-emitting devices (LED's) should find numerous uses in optoelectronics. For example, the integration of silicon LED's with silicon microelectronics could lead to reliable and inexpensive optical displays and optical interconnects. Until recently, however, it had not been possible to obtain efficien…
The production of polyhydroxybutyrate (PHB) by Alcaligenes eutrophus DSM 545 was studied in a synthetic medium with 3% glucose at pH 7.0 supplemented with several ammonium substrates and cane molasses. Growth was measured by dry cell weight, and the PHB content was measured by gas chromatography. The effects of ammoni…
Aging and life models based on growth of electrical trees in insulating materials and systems subjected to electrical stress are investigated. The models consider aging to be primarily a function of either the tree length or the intensity of discharges occurring within the trees. In terms of the latter quantity, a mod…
The glass structure and physical properties are reported for the nonconventional binary bismuth cuprate glasses of compositions (CuO${)}_{\mathit{x}}$(${\mathrm{Bi}}_{2}$${\mathrm{O}}_{3}$${)}_{100\mathrm{\ensuremath{-}}\mathit{x}}$, for x=27--70 mol %, prepared by the roller-quenching technique. It has been observed…