Materials Literature
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TiNi intermetallic compounds were manufactured on an industrial scale using a combustion synthesis process that exploits the heat of formation between Ti and Ni. In this paper we investigate the influence of Ni content on the phase transformation temperature. The TiNi shape memory intermetallic compounds manufactured…
Abstract The amphiphilic 5, 11, 17, 23‐tetra‐ t ‐butyl‐25, 26, 27, 28‐tetrakis(carboxymethoxy)calix[4]arene ( 1 ) forms stable monolayers at the air‐water interface which serve as template to induce growth of CaCO 3 (calcite) single crystals. The nucleation density and the preferred orientation(s) of calcite single cr…
A novel technique to derive the closed-form spatial Green’s function for finite dielectric structures is presented by employing a combination of the characteristic Green’s function (CGF) and complex images (CI) techniques. To show the versatility of this technique, a two-dimensional finite dielectric substrate is stud…
The local lithium environment in electrochemically lithiated xerogel, and sulfonated nanocomposites is probed with solid-state static and magic angle spinning (MAS) nuclear magnetic resonance (NMR). The line width from the static NMR spectra reveals differences between the lithium environments in the three materials.…
The gram scale syntheses of first and second generation (G1 and G2) dendrons 1-4, and 35, based on aryl and alkyl moieties, by Suzuki-Miyaura cross-coupling are presented. Both a divergent and an accelerated convergent route are applied. In addition, first results on the synthesis of hyperbranched oligomers of AB2 mon…
The coarsening dynamics of a faceted vicinal crystalline surface growing into its melt by attachment kinetics is considered. The convective Cahn-Hilliard equation ( CCH ) is derived as a small amplitude expansion of such surface evolutions restricted to 1-D morphologies, with the local surface slope serving as the ord…
In this review, on the basis of our recent theoretical and experimental studies, we discuss the magnetic and electrical properties of γ-phase and L10-type antiferromagnetic Mn alloys. The point we wish to stress is that the calculated electronic properties are consistent with the experimental magnetic and electrical r…
The atomic and magnetic structures of the MnAs compound are investigated using neutron diffraction at high pressures up to 38 kbar in the temperature range 15–300 K. It is found that, as the temperature decreases under high pressure, the MnAs compound undergoes a spin-reorientation transition from the ferromagnetic or…
The phase characterization of two homologous series of liquid crystalline methacrylic monomers based on ω-hexyl- and ω-butyloxysalicylaldimine groups, with different alkoxy tails, is presented. The liquid crystalline materials were characterized by polarising optical microscopy, differential scanning calorimetry, diff…
The investigations of dielectric permittivity, optic birefringence and Raman scattering spectra for CuInP 2 (Se x S 1 m x ) 6 mixed crystals give evidence about rapid lowering of the temperature and smearing of first order transition between monoclinic paraelectric and ferroelectric phases at sulfur by selenium replac…
The behavior of nitrile rubber during long-term thermal aging was evaluated by following the migration of low-molecular-weight additives and additive degradation products from the material. Headspace-GC-MS analysis showed that at 60C the number of low-molecular-weight compounds released was rather low, but a significa…
The strengthening and toughening of low density polyethylene (LDPE)-polypropylene (PP) blends with a commercial ethylene/propylene block copolymer (CO) have been investigated. It is shown that the addition of the copolymer improved the ductility of the LDPE-PP blends without any loss of elastic modulus. Particularly f…
These project will explore the functionalization of carbon nanotubes via the formation of molecular complexes with perylene diimide based systems. It is anticipated that these complexes would be soluble in organic solvent and enable the homogenous dispersion of carbon nanotubes in polymer films. Molecular complexes wi…
The pyrolysis behavior of organic-inorganic hybrids with Si-O-Nb/Si-O-Ta oxygen bridged heterometallic bonds was investigated. The easy cleavage of Si-O-Nb bonds was confirmed by infrared (IR) spectra, and Si-O-Ta bonds were broken at higher temperatures, suggesting the difference in energy between Si-O and O-M (M=Nb…
Reaction of BaII and CrIII,VI compounds with oxalates in water affords a salt of empirical formula {Ba6(H2O)17[Cr(ox)3]4}·7H2O (1), consistent with the expected 3BaII/2CrIII ratio; the triclinic structure is held together by unusual water and oxalate bridges, and compound 1 proved to be suitable for the synthesis of n…
A nonlocal formulation of rubber elasticity with applications to nanostructured materials is developed. In general, stress has an entropic and an energetic component. The energetic component is due to short-range interactions of the representative atom with its neighbors, while the entropic component is due to chain c…
Abstract The complex [Mg(1, 10‐phenanthroline) 3 (NO 3 ) 2 ]·9H 2 O has been synthesized. It forms crystals having the shape of sheaves with very thin filaments. The compound has been characterized by UV, IR, NMR and mass spectra. The UV and mass spectra are indicative of an electron density transfer from NO 3 — to Mg…
SUMMARIES On the basis of results obtained by the accelerated ageing of papers made of bleached softwood and rag cellulose the apparent activation energies of cellulose degradation were estimated as being 103 and 106 kJ/mol respectively. The temperatures of 40º and 60ºC were found to be inappropriate for the study of…
Abstract Hydrophilic polysulfone ultrafiltration membranes were prepared from blends of cellulose acetate and carboxylated polysulfones of 0.43 and 0.75 degrees of carboxylation. The effects of degree of carboxylation on membrane characteristics such as compaction, pure water flux, water content and membrane hydraulic…
The wide range of electrical, electrochemical, and optical properties associated with Polyaniline (PANI) and its composites has made them attractive for many industrial applications. In this study, Emeraldine Salt (ES), which is a doped conducting form of PANI, was chemically prepared in situ using the oxidizing agent…