Materials Literature
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The mechanical behavior of glassy polymer bonds is examined with molecular dynamics simulations. We show that the interfacial strength of the bond in mode I (tensile) and mode II (shear) fracture is strongly influenced by the coupling between the adhesive and adherends as well as by the roughness of the substrate surf…
Persistent questions regarding the electrochromic ferric-ferrocyanide chromophore, Prussian blue (PB), are addressed and definitively resolved by detailed chemical and energy-dispersive X-ray analyses and spectroscopy: ( i ) What is the nature of the initially deposited film? ( ii ) Restructuring of freshly deposited…
The total structure factors, S(Q) of 50:50 mole% CaO:Al 2 O 3 - and 67:33 mole% SrO:Al 2 O 3 -composition liquids have been determined by neutron diffraction. Measurements were made on laser beam-heated liquids at 2000–2100 K held in an aerodynamic levitator. Pure vanadium levitation nozzles were used. Reduction of th…
The mechanical behaviour of bulk ultrafine-grained Al-7.5 wt% Mg alloy consolidated from cryomilled powders has been investigated. The experimental data show that the alloy exhibits high strength, low strain hardening, serrated flow and relatively high ductility. In addition, the data indicate that the yield strength…
This paper describes a numerical model for the nucleation, growth, and transport of gas-phase particles formed during the chemical vapor deposition (CVD) of epitaxial silicon from silane. These particles can lower the deposition rate by consuming precursor, and contaminate the growing film via diffusion to the surface…
Binuclear copper(II) complexes with cyclodextrins were used as templates for the generation of nanodisperse inorganic–organic hybrid materials. Calcination of these hybrid composites results in one-step to mesoporous silicas with incorporated copper nanoparticles. The average pore size of these silicas was characteriz…
The role of diffusion in ceramic processing is discussed. The utility of secondary ion mass spectroscopy (SIMS) is highlighted for the evaluation of diffusion coefficients in ceramic materials. By comparing diffusion coefficients obtained in this manner with those obtained indirectly from creep measurements, we identi…
High-temperature heat treatment of polyimide (Kapton) film yielded a highly oriented graphite film, composed of nearly ideal thin graphite layers with 6 ˜ 7nm in thickness. The graphite films assumed various characteristic forms in appearance depending on heat-treatment. The graphite films containing minute vesicles w…
Ag nanoparticles were added to 2,5-dimercapto-1,3,4-thiadiazole (DMcT)-polyaniline (PAn) composites to improve charge-discharge performance of the composites as a cathode material for lithium rechargeable batteries. The effect of the Ag nanoparticles addition to the DMcT-PAn composite film was investigated. Adding the…
Devitrification behaviour of Mg-Ni-Mm and Mg-Ni-Y-Mm metallic glasses (Mm = misch metal) was studied by differential scanning calorimetry, isothermal calorimetry, X-ray diffractometry and transmission electron microscopy. These materials exhibited a multistage devitrification with a primary exothermic peak with an ons…
The objective of this paper was to investigate how the use of the pulsed mode affects the H atom and radical densities in discharges obtained using a microwave cavity coupling system. The species densities as well as gas temperature and electron energy distribution functions were obtained using a quasi-homogeneous dis…
ABSTRACT: Chitosan antifungal capacity when the biopolymer is used as an edible film and as a dough ingredient in precooked pizza was studied. This action was evaluated against the fungi that produce major spoilage in that product. It was observed that the use of chitosan in acetic acid as edible coating (0.079 g/100…
The crystal structures of three iron(II) complexes with Croconate Violet [3,5-bis(dicyanomethylene)cyclopentane-1,2,4-trionate dianion = L2−] have been determined: K2[FeL2(H2O)4] 1, {[Fe(2,2′-bipy)L(H2O)2]·H2O}22 and {[FeL(H2O)2]·2H2O}n3. Complex 1 consists of dianionic pseudo-octahedral mononuclear entities containin…
A novel one-pot "AB2 + AC2" approach based on palladium catalyzed Suzuki polycondensation was developed to prepare hyperbranched aryl/alkyl polymers with a high degree of branching.
Magnesium alloys,having high specific strength,with a density only 2/3 of that of aluminum and 1/4 of carbon steels,have become ideal materials for low mass applications such as automobiles and electronic devices.It was dealt with the state of the art in developing cost effective,low mass,high ductility and high creep…
Mg–Co and Mg–Fe systems were employed as a candidate hydrogen storage alloy. Different from Mg–Ni system, there exist no line compounds of Mg2Co and Mg2Fe. Non-equilibration of these compounds is indispensable to make solid state synthesis. Bulk mechanical alloying was applied to this non-equilibration of Mg2Co with s…
A divergent synthetic approach to the construction of dimethylsilyl linked dihydroxybenzyl alcohol based dendrimers via acid–base hydrolytic chemistry of bis(dimethylamino)dimethylsilane with 3,5-dihydroxybenzyl alcohol, is reported. The peripheral OH groups lead to significant aggregation that was studied using FT-IR…
Abstract The properties of melamine based supramolecular compounds have been studied with rheological, thermal, mechanical, dielectric and scattering techniques and compared with similar covalently bonded materials. The complexes are based on a linear pTHF‐diol ( M n = 1 000) connected via a diisocyanate with melamine…
Solubility parameters are introduced for the first time to investigate the solubility problem of liquid crystals. Using Fedors method that is used for polymers and organic solvent gives solubility parameters of liquid crystals in the range of 8.0 (cal/cm 3 ) 1/2 to 11.0 (cal/cm 3 ) 1/2 . Polar liquid crystal compounds…
Incorporation of acenaphtho[1,2-c]pyrrole units into the π-conjugated systems is very effective to get the narrow HOMO-LUMO gap materials, and the absorption spectra of π-conjugated polymers, porphyrins, and boron dipyrromethene dyes fused with acenaphthene rings are extensively red-shifted.The reaction of nitroalkene…