Materials Literature
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Abstract The Cerchar abrasiveness test is a common testing procedure for the prediction of tool wear but consistent and detailed recommendations of the testing procedure are inexistent until now. One point of disagreement is the required number of scratch tests per sample to obtain reliable results depending on the gr…
Abstract Polystyrene (PS), being an amorphous polymer is immiscible with other polymers. To engender miscible blends, PS has been functionalized with an active amino‐functional group on the molecular chains of PS to yield amino‐substituted polystyrene (APS), which serves as a reactive compatibilizer. The compatibiliza…
In this work, a method has been developed to simulate fabric surface appearance from achieved yarn properties. The simulation of woven fabric surface appearance depends on yarn and fabric cross sectional geometry as well as on yarn measurements and yarn image recordings. A yarn winding device has been designed to take…
Elasto-plastic crack solutions for some one- and two-dimensional quasicrystals have been found based on the generalized Dugdale–Barenblatt model. The size of the plastic zone and crack tip opening displacement are determined, from which a plastic fracture criterion for the materials is suggested.
Abstract Ferroelectric Glycine Phosphite (GPI) crystal have been grown from aqueous solution employing the slow cooling technique. As the crystal solubility in water depends on temperature, single crystals were grown. Transparent, colourless crystals with habit morphology weighing about 8g were obtained with in a mont…
The pyrolytic carbon black (PCB) made from used tires was used in styrene‐butadiene rubber (SBR). The basic properties of PCB were characterized. The effects of PCB on the processing properties of SBR compounds and the mechanical properties of vulcanizates were investigated and compared with other traditional fillers.…
Abstract Summary: Thermal properties of nanocomposites prepared of poly(L‐lactide) (PLLA) and CaCO 3 applying differential scanning (DSC) calorimetry and thermogravimetry (TG) were studied. Nanocomposites were prepared by extrusion process at 170 °C. DSC measurements show that CaCO 3 has no influence on glass transiti…
Three shapes of silicon carbide tensile specimens were tested - curved with a low stress-concentration factor and straight with a circular hole or an elliptical hole. The nominal thickness was 125 mum with a net section that is 100-mum wide; the overall length of these microspecimens was 3.1 mm. They were fabricated b…
Eleven novel pregnane glycosides, 2-7 and 9-13, of which four, i.e., 10-13, comprised a new pregnane-type genin exhibiting a hydroxymethylene instead of a Me group at C(19), and the known pregnane glycoside stalagmoside V (8) were isolated from whole plants of Caralluma adscendens var. fimbriata, a native Indian succu…
The International Roadmap for Ferroelectric Memories requires three-dimensional integration of high-dielectric materials onto metal interconnects or bottom electrodes by 2010. Here, we demonstrate the possibility of conformally coating carbon nanotubes with high-dielectric oxide as a first step toward ultrahigh integr…
The effect of liquid gallium and aluminum on some hard metals leading to dissolution and formation of intermetallic compounds (IMC) under static conditions and rotation of a specimen is studied. The solubility parameters from the Clapeyron-Clausius equation were considered to estimate the stability of still not studie…
The properties of sealing materials are important for the performance and reliability of solid oxide fuel cells (SOFCs). Even if the properties of a sealing material can be studied separately, it remains difficult to quantify the effect of an imperfect seal on the repeat-element behavior. In this study, simulation is…
Rigid polyurethane foams have been fabricated from polymeric MDI and polypropylene glycols (PPG) synthesized with two different initiator compositions using two different types of blowing agents, viz., the conventional HCFC 141b and environmently friendly HFC 365 mfc. It was found that the two blowing agents gave iden…
Abstract Single crystals of potassium acid phthalate (KAP) and amino acid (DL‐Alanine, L‐Methionine) doped KAP were grown from aqueous solutions by slow cooling method. The grown crystals were characterized using powder X Ray diffraction (XRD) and Fourier Transform Infrared (FTIR) analysis. The thermal stability of KA…
Collective diffusivity in a suspension of rigid particles in steady linear viscous flows is evaluated by investigating the dynamics of the time correlation of long-wavelength density fluctuations. In the absence of hydrodynamic interactions between suspended particles in a dilute suspension of identical hard spheres,…
The detailed geometrical structures of zigzag and armchair type single-walled carbon nanotubes (SWCNTs) with infinite tubular length were investigated using localized Gaussian type orbital-periodic boundary condition-density functional theory (LGTO-PBC-DFT) method. The structures of (n, 0) zigzag SWCNTs were optimized…
Abstract Summary: An efficient strategy to achieve electrical conductivity in melt‐mixed co‐continuous blends is to restrict the conducting filler in a particular phase in the blends next to forming a percolated ‘network‐like’ structure in that particular phase. However, strong inter‐tube van der Waals' forces often l…
Electronic Raman spectra of UO 2 were measured under high hydrostatic pressure up to 21.5 GPa at room temperature. Resonant coupling was found between four (instead of the expected two) intermultiplet crystal-field (CF) excitations (γ 1 –γ 4 ranges from 4130 to 4580 cm −1 ) and n LO phonons ( n = 1–4, ω LO ≈578 cm −1…
Abstract Experiments were performed to investigate the transformation of natural aragonite crystals to calcite by reaction with aqueous solutions of calcium carbonate at hydrothermal conditions for different periods of time. X-ray powder diffraction (XRD), scanning electron microscopy (SEM), Raman spectroscopy and Las…
Abstract The assignments of OH-bending bands in the infrared (IR) spectra of dioctahedral smectites (montmorillonites, ferruginous smectites, and nontronites) have been revisited using a cation mass-valence sum (CM-VS) approach to quantify octahedral cation occupancy. The CM-VS approach enabled prediction of OH-bendin…