Materials Literature
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Atomistic computer simulation techniques are used to investigate the surface properties and defect chemistry of the LaCoO3 perovskite. The theoretical techniques are based upon efficient energy minimisation routines, a ‘two-region’ strategy and the Mott–Littleton methodology for the accurate modelling of surface and b…
This article describes the impact and dynamic mechanical properties of rubber-modified binary blends of polypropylene (PP). Two conventional elastomers [viz. ethylene vinyl acetate copolymer (EVA) and ethylene propylene diene terpolymer (EPDM)] were used as an impact modifier for PP. It is clearly indicated by the res…
Mixtures of various ratios of cubic ice and glassy water were obtained by so-called hyperquenching of micrometer-sized water droplets at cooling rates of ≈106–107 K s−1 on a substrate held at selected temperatures between 130 and 190 K. These samples were characterized by differential scanning calorimetry (DSC) and X-…
The type of porogen added to the continuous phase of HIPEs containing divinylbenzene strongly influences the morphology of the resulting PolyHIPE foam. The cell size was reduced as the solvent became a better cosurfactant, as inferred from surface pressure measurements of films representative of each HIPE continuous p…
The effects of a catalyst and coupling agent as well as a curing process on exfoliation behavior of CH3(CH2)15NH3+–montmorillonite clay in an anhydride-cured epoxy–clay system have been investigated by XRD, DSC, and TEM. The results have shown that the organoclay is easily intercalated by the epoxy precursor during th…
In quest of new, single-site catalysts for cyclic ester polymerizations, a series of mononuclear yttrium(III) complexes of N,N′-bis(trimethylsilyl)benzamidinate ([LTMS]−) and hindered N,N′-bis-(2,6-dialkylaryl)toluamidinates ([LEt]−, aryl = Et2C6H3, and [LiPr]−, aryl = iPr2C6H3) were synthesized and characterized by X…
The biodegradability of poly(vinyl alcohol) (PVA) was investigated under different conditions by respirometric determinations, iodometric analysis, and molecular weight evaluation. Microbial inocula derived from the sewage sludge of municipal and paper mill wastewater treatment plants were used. A rather active PVA-de…
The p-styrenyl substituent borne by the organoimido ligand in the Lindqvist derivative [NBu4]2[Mo6O18(NC6- H4CHCH2)] 1 allows the polyoxometalate complex to be introduced as a pendant group in polystyrene compositions via conventional free radical-induced copolymerization.
Abstract II-VI group compound semiconductors such as CdS, CdSe, and CdTe nanowire arrays have been prepared by direct current electrodeposition in porous anodic aluminum oxide template from nonaqueous electrolyte. SEM and TEM results show that these nanowires have a highly anisotropic structure of aligned nanowires wi…
The study of the chemical processes that occur during the synthesis of inorganic solids has attracted much recent attention. The ultimate aim of these experiments is the atomic level understanding of reaction mechanisms which lead to the formation of extended inorganic solids, so that rational design of new materials…
2-Mercaptonicotinic acid (H2mna = 2-HS(C5H3N)CO2H) gave two types of silver(I) complexes by a reaction with Ag2O suspended in aqueous media; one was a water-insoluble, DMSO-soluble yellow powder [Ag(Hmna)]6·4H2O 1 formed under acidic conditions, and the other was a water-soluble, yellow powder {Na[Ag(mna)]·H2O}n 2 for…
Electrical Engineering Magnetic Hysteresis Understanding magnetic hysteresis is vitally important to the development of the science of magnetism as a whole and to the advancement of practical magnetic device applications. Magnetic Hysteresis, by acclaimed expert Edward Della Torre, presents a clear explanation of the…
The donor–acceptor dye cassettes 1–4 were designed to capture energy at a single wavelength and to convert it to well-resolved, intense fluorescence emissions; in practice, Stokes’ shifts of 40–148 nm, quantum yields of 0.12–0.60, and efficient energy transfer was demonstrated.
The objective of this work was to investigate the efficiency of imidazole and its derivatives 4‐methylimidazole, 4‐methyl‐5‐hydroxy‐methylimidazole, 1‐lphenyl‐4‐methylimidazole, and 1‐( p ‐tolyl)‐4‐methylimidazole for corrosion inhibition of copper in 0.5 M hydrochloric acid. Corrosion inhibition was studied using pot…
By employing Fourier transform infrared spectroscopy (FTIR) and curve–fitting techniques, the degree of crystallinity of poly(ε-caprolactone) (PCL) aged at room temperature for 1 month was estimated to be 49 ± 2 %. The degree of crystallinity determined by FTIR in this work is comparable with those found by other conv…
Carbon nanofibers with a mean diameter of about 50 nm were successfully used as support for a palladium catalyst in the liquid phase selective hydrogenation of the CC bond in an α,β-unsaturated molecule: a less critical problem of mass-transfer limitation led to the obtention of a highly active and chemo-selective cat…
Polypropylene (PP)/montmorillonite (MMT) nanocomposites have been prepared by melt intercalation using organomontmorillonite and conventional twin screw extrusion. The dispersibility of silicate layers of the montmorillonite in the composites was investigated by using X-ray diffractometer and transmission electron mic…
Electrochemical polymerisation has been found to be a convenient method for the synthesis of a thin film composite of a conducting polymer (polypyrrole) and strongly luminescent CdTe semiconductor nanocrystals. Optimal conditions (relatively low anodic potential, neutral pH, aqueous solution) for the synthesis of unif…
Failures of small internal diameter vascular grafts have been caused by the lack of a stable endothelial lining to form on their artificial surfaces. Polymer surfaces can be optimized by means of proper treatment to allow a homogeneous and uniform coverage in artificial prosthesis applications. Several solutions were…
Porous gold structures with nearly regular 15 μm channels have been prepared by a novel route in which the calcium carbonate skeletal plates of echinoids (sea urchins) are used as templates.