Materials Literature
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Zinc bismuth vanadate glasses with compositions 50V2O5-xBi2O3-(50-x) ZnO have been prepared using a conventional melt-quenching method and the solubility limit of Bi2O3 in zinc vanadate glass system has been investigated using x-ray diffraction. Density has been measured using Archimedes’ principle; molar volume (Vm)…
With good electrical properties and an inherently complex crystal structure, Cu 2− x Se is a potential “phonon glass electron crystal" thermoelectric material that has previously not attracted much interest. In this study, Cu 2− x Se (0 ≤ x ≤ 0.25) compounds were synthesized by a melting-quenching method, and then sin…
A flexure joint is an important component in flexure mechanisms. Most of well known flexure joints have always a trade-off among such performances as precision, stiffness, and stroke, which heavily affect the overall performances of flexure mechanisms. In this paper, a new flexure joint, named an anti-symmetric double…
We report unprecedented non-Einstein-like viscosity decrease of polymer melts by special low glass transition, Tg, inorganic tin fluorophosphate glass (Pglass) that is remarkably counter to widely accepted dispersions, suspensions, and composites theories. The well dispersed low-Tg Pglass dramatically decrease the pol…
Black liquor is the major by-product and biomass fuel of pulp mills, and the understanding of its thermophysical properties is essential for the improvement of the design and the operation of chemical recovery processes. In this work, the rheological behaviour of industrial samples of Eucalyptus globulus black liquor…
An apparatus for small angle light scattering (SALS) and light transmission measurements under shear was built and tested at the University of Massachusetts Amherst. As a new development, the polarization direction can be rotated by a liquid crystal polarization rotator (LCPR) with a short response time of about 20 ms…
We have interpreted the results of shear creep data on samples of bread dough, tested in a parallel plate rheometer, by using a damage function model. Whilst the agreement between calculation and experimental results is satisfactory for the dough for stress levels less than 500 Pa, increasingly large deviations from t…
For many applications in precision engineering, a six degrees of freedom (DoF) compliant stage (CS) with zero stiffness is desirable, to deal with problems like backlash, friction, lubrication, and at the same time, reduce the actuation force. To this end, the compliant stage (also known as compliant mechanism) can be…
The aim of this article is to introduce a new topology optimisation formulation for optimal robust design of Micro Electro Mechanical Systems. Mesh independence in topology optimisation is most often ensured by using filtering techniques, which result in transition grey regions difficult to interpret in practical real…
The purpose of this paper is to present new concepts for designing fully-compliant statically-balanced mechanisms without prestressing assembly. A statically-balanced compliant mechanism can ideally provide zero stiffness and energy free motion like a traditional rigid-body mechanism. These characteristics are importa…
Laser Patterning of Carbon-Nanotubes Thin Films and Their Applications 529 Application of the LIBT techniqueThe LIBT technique has been used to transfer Cr 27 on quartz and phahalocyanine solids on PMMA 28 .However, LIBT is used less frequently than LIFT technique due to its need for a transparent acceptor substrate.H…
In 1991 Iijima In order to understand the structure of a carbon nanotube, it can be first imagined as a rolled up sheet of graphene with planar-hexagonal arrangement of carbon atoms distributed in a honeycomb lattice. CNTs are classified into single-walled carbon nanotube, double-walled carbon nanotube, and multi-wall…
In the present communication, a study on the preparation and characterization of natural pine needle–reinforced biocomposites using compression molding technique has been reported. Different mechanical and physicochemical properties of the biocomposites have been investigated as a function of fiber loading for assessi…
The thermoelastic properties of a sample of chalcopyrite from the Palabora mine, South Africa, have been investigated in the temperature range 4.2 – 330 K at ambient pressure, and between 0.22 and 6.81 GPa at ambient temperature. Magnetization measurements indicated a transition to a second antiferromagnetically order…
The corrosion behavior of pure iron in naturally aerated stagnant solutions of 3.5% NaCl and its inhibition by 1,1’-thiocarbonyldiimidazole have been reported. The study was carried out using open-circuit potential, cyclic potentiodynamic polarization, potentiostatic current-time, and electrochemical impedance spectro…
By explicitly considering surface roughness at the atomic level, we quantitatively show that the thermal conductivity of Si nanowires can be lower than Casimir's classical limit. However, this violation only occurs for deep surface degradation. For shallow surface roughness, the Casimir formula is shown to yield a goo…
Carbon nanotubes (CNTs) are emerging versatile tools in nanomedicine applications, particularly in the field of cancer targeting. Due to diverse surface chemistry and unique thermal properties, CNTs can act as strong optical absorbers in near infrared light where biological systems prove to be highly transparent. The…
We present the structural and photoluminescence properties of 30 keV gadolinium implanted and subsequently annealed zinc oxide (ZnO) single crystals. Rutherford backscattering and channeling results reveal a low surface region defect density which was reduced further upon annealing. For low implantation fluence, aroun…
Abstract Novel organic‐inorganic hybrid mesoporous materials containing diimine moieties inside the pore wall were used for the grafting of an oxo‐vanadium Schiff base complex at the mesopore surface. The prepared catalyst was found to be highly active and selective for the oxidation of a variety of primary, secondary…