Materials Literature
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Metal complexes of pyridine and bipyridine-type ligands represent an important class of nonlinear optical (NLO) materials: (i) They can incorporate a variety of functionalised ligands with a wide range of metals which can give rise to tuneable NLO properties; (ii) they are generally associated with intense low-lying c…
Nanotubes are rich in potential applications, but they are very difficult to purify, and yields are often less than 1 %. The solution presented here is to suspend nanotubes in a polymer matrix, which then acts as a filtration system. Incorporation is achieved by sonication, followed by a period of settling, during whi…
Two potential obstacles to the creation of implantable tissue engineered heart valves are inadequate mechanical properties (ability to withstand hemodynamic stresses) and adverse host-tissue reactions due to the presence of residual nondegraded polymer scaffold. In an attempt to address these problems, we developed an…
The rheological effects occuring when an emulsion is mixed with a suspension can be detected using a helical ribbon stirrer. The stirrer rotates in a rheometer cup and is connected to the torque sensor of the rheometer. During mixing, microstructural changes which are related to the interactions between the continuous…
Mixing is the most important operation in polymer processing. Uniformity of the molecular weight, degree of entanglement, temperature, and composition, is the prerequisite for good performance. Mixing of molten polymers is always within the laminar (as opposed to turbulent) flow regime. This paper presents an overview…
In this paper, we study gap effects and apparent slip phenomena in a torsional flow of a moderately concentrated hydrophobically modified associative polymer solution.Slip is investigated by varying the gap between concentric parallel disks, and the plate surface roughness.The onset of apparent slip is shown to occur…
In this paper, the dimensional and some physical properties of a series of plain jersey and lacoste fabrics made from both cotton ring and open-end spun yams are investigated. The results show that structural differences in the yarn play a large part in determining the dimensions and behavior of these two fabric types…
The specific heat capacity Cp of the non-crystalline solid (100 — x)TeO2–(x)V2O5 glasses where x = 10, 25, 40 and 45 mol% has been measured in the temperature range 300 to 650 K. The difference of specific heat capacities, ΔCp of the glass (Cp glass) and supercooled liquid (Cp liquid) at Tg was also measured for the w…
A plasma source has been developed, which makes use of electron cyclotron microwave resonance conditions without cost-intensive tuning or other active elements. A magnetron typical of domestic microwave ovens is coupled to a cylindrical resonator of fixed dimensions. A high density plasma is maintained with permanent…
There are claims in the scientific literature that many biological materials are ferroelectrics, and that ferroelectricity, along with piezo-and pyroelectricity, are a fundamental property of biological materials. The best way to tackle this general problem is to start from the very beginning, namely from protein amin…
In performing atomic cluster calculations of local electronic structure defects in ionic crystals, the crystal is often modeled as a central cluster of 5–50 ions embedded in an array of point charges. For most crystals, however, a finite three-dimensional repeated array of unit cells generates electrostatic potentials…
The linear attenuation coefficients in aqueous solutions of three carbohydrates, glucose (C6H12O6), maltose monohydrate (C12H22O11·H2O), and sucrose (C12H22O11), were determined at 81, 356, 511, 662, 1173, and 1332 keV by the gamma-ray transmission method in a good geometry setup. From the precisely measured densities…
Coprecipitation is the method most frequently applied to prepare Layered Double Hydroxides (LDHs). Two variations of this method can be used, depending on the pH control conditions during the precipitation step. In one case the pH values are allowed to vary while in the other they are kept constant throughout coprecip…
Corrosion management principles, along with conventional technical solutions to corrosion problems in industry, can be utilized to mitigate corrosion and its resulting problems.
Six new heteropoly compounds in the [M4(H2O)2(As2W15O56)2]16- series (M = CuII, MnII, CoII, NiII, ZnII, CdII), previously unknown, were synthesized and characterized by means of IR, UV-vis, CV, 183W NMR, TG-DSC, and elemental analyses. The synthetic method used in preparing this type of heteropoly compounds was differ…
We have explored spin, charge, and orbitally ordered states in ${\mathrm{La}}_{1\ensuremath{-}x}{\mathrm{Sr}}_{x}{\mathrm{MnO}}_{3}$ $(0<x<1/2)$ using model Hartree-Fock calculations on $d\ensuremath{-}p$-type lattice models. At $x=1/8,$ several charge and orbitally modulated states are found to be stable and al…
The aim of this study is to understand deeper the thermal diffusion transport process (Ludwig–Soret effect) at the microscopic level. For that purpose, the recently developed reverse nonequilibrium molecular dynamics method was used to calculate Soret coefficients of various systems in a systematic fashion. We studied…