Materials Literature
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Abstract Colloidal gold nanoparticles self-assembled into macroscopic aggregates by a charge-transfer interaction between a 9-carbazolyl unit as an electron-donor immobilized on the surface of the gold nanoparticles and a bivalent linker containing two dinitrophenyl units as electron-acceptors. Transmission electron m…
Abstract Carbamoylation of cellulose esters (CE) and investigation of the mixed derivatives obtained with NMR spectroscopy represents a useful analytical tool for the determination of the degree of substitution (DS) and analysis of the distribution of substituents on the level of the anhydroglucose unit (AGU). Especia…
This work reports the synthesis of two different polyamidoamines (PAAs), by the reaction of piperazine (Pip) and cyclohexylamine (CHA) with N,N′‐methylene bis acrylamide (MBA), which subsequently copolymerized with vinyl acetate (VAC) to improve the mechanical properties of the materials. The materials were characteri…
The crystallographic and magnetic properties of a series of substitutions in nickel ferrite where the Fe³+ is replaced with In³+ have been investigated using X-ray diffraction (XRD) and Mossbauer spectroscopy. Information on the exact crystalline structure, lattice parameters, bond lengths and bond angles were obtaine…
Abstract. Sulfur (S) solubility is determined in silicate melts, in particular with low-FeO content coexisting with graphite. In a high FeO range (>10 mol %), the S solubility is strongly dependent on the FeO content in silicate melt, which is in good agreement with previous works. In an intermediate FeO range (1∼10 m…
We prepared poly(6-[4-(4'-cyanophenyl)phenoxy]hexyl acrylate)s with various molecular weights ( M n ) and narrow molecular weight distributions, and examined the M n dependence of phase behavior which includes the reentrant nematic (RN) phase. Polymers with M n lower than 20,000 form nematic (N), smectic A (SmA) and R…
The equilibrium configuration of liquid crystal molecules in contact with a periodicly patterned substrate has been theoretically analysed considering the variation of the order parameter at the interface, and a first order transition was predicted for a critical periodicity, or induced by temperature or an electric f…
We use the framework of recently formulated kinetic model of temperature-dependent processes accompanying the recording and erasure of diffraction gratings in a polymer matrix doped with azobenzene chrompohores under the illumination with spatially modulated and linearly polarized light to study general features of te…
The Rayleigh-Brillouin light scattering in chalcogenide glasses of the Ge-Sb-S system in the (Sb 2 S 3 ) x (GeS 2 ) 100− x ( x = 0–50) set is investigated. The longitudinal hypersonic velocity, the high-frequency longitudinal elastic modulus, the extinction coefficient at the wavelength λ = 0.6328 μm, and the Landau-P…
Sistemas de materiais nanoestruturados são mais comumente definidos como aqueles que contêm pelo menos uma característica microestrutural com dimensões nanométricas (até 150 nm). O interesse em nanocompósitos de matriz cerâmica está associado à melhoria nas propriedades mecânicas e ao desgaste. Dispersões de pequenas…
The influence of different chemical classes of waxes, used commercially as internal and external lubricants, on the processing behaviour of PVC in profile extrusion is described, drawing on the results of systematic laboratory testing. The present study concentrates on long chain ester waxes, oxidised polyethylene wax…
Abstract Modification of Lyocell dopes with special additives enables the creation of new innovative materials. Additives with functional groups and active surfaces may initiate complex chemical reactions in cellulose/ N ‐methylmorpholine‐ N ‐oxide monohydrate (NMMO) solutions. The effect of carboxylic groups on the t…
It is shown that a spatially localized collective excitation of the atomic sublattice (autosoliton) appears and propagates in a structurally unstable crystal occurring in a pretransition state. The autosoliton, on the one hand, is a structural defect comprising two interphase boundaries separated by the second phase,…
Este trabalho reporta a obtenção de nanopartículas de aluminato de zinco dopado com Eu3+, por meio do método de síntese por reação de combustão. Foram preparadas quatro amostras com diferentes concentrações de dopante, para avaliar o efeito do teor de Eu3+ na luminescência dos pós obtidos. Os resultados de difração de…
Abstract Brass films were formed on steel rods by magnetron sputtering by using 63 wt% Cu - 37 wt% Zn target in Ar plasma. The brass plated steel rods were inserted in crude rubber and then cured to form various samples. Rubber-brass inter-reacted layers were investigated by cross sectional TEM observation. Evaluation…
In this article, thermoluminescence (TL) studies on a Sm3+ doped SrB4O7 compound irradiated by an electron beam are reported for the first time. The polycrystalline powder samples of SrB4O7:Sm phosphor were prepared by a solid-state reaction in air at high temperature, and the TL glow curves and TL emission spectra af…
The dispersion of TiO2 nanoparticles in high‐impact polystyrene (HIPS) has been studied. The TiO2 nanoparticles obtained are in a uniform diameter of 20–50 nm and an anatase phase. After being treated by a coupling agent of rear earth‐aluminate, the TiO2 nanoparticles can be dispersed uniformly in HIPS by using a co‐r…
Summary The release of mercury and thallium from liquid eutectic lead-bismuth alloy (LBE) under a flowing Ar/7%-H 2 atmosphere has been studied in the temperature range from 408 to 1292 K using γ-ray spectroscopy. For technical applications such as liquid metal spallation targets or accelerator driven systems, where l…
Two new 5‐substituted 1,3,4‐thiadiazole‐2‐carboxylate esters have been synthesized via ring closure of appropriate tricarbonyl precursors using Lawesson's reagent. The chemistry described is the first report of such methodology in the organic literature. The new materials display broad smectic C phases and show consid…
This research concerned with the use of rice husk (Oryza sativa) as a filler for polypropylene and its recycle ability. Rice husk (200 mesh and 40% by weight) and polypropylene were compounded in a twinscrew extruder and injection moulding technique was applied in order to obtain testing specimens. It was found that t…