Materials Literature
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The development of microstructural damage in silicon carbide fibre (Nicalon™) reinforced glass matrix composite samples subjected to thermal shock was investigated by using a nondestructive forced resonance technique and fibre push out indentation tests. Thermal shock testing involved quenching samples in a water bath…
When the steel rebar depassivates, the corrosion starts to develop at a rate which mainly depends upon the moisture content in the concrete pores. In natural outdoor exposure conditions, the moisture content will depend not only on the relative humidity of the atmosphere but also upon the temperature cycling occurring…
Glycolysis of nylon-6, in the presence of phosphoric acid at 250°CC, leads to a mixture of low molecular weight compounds. HPLC analysis combined with 1H-NMR and mass spectroscopy showed that the main degradation products were ethylene glycol derivatives of caprolactam and linear oligomers. No cyclic oligomers were fo…
Abstract Crosslinked samples of natural rubber (NR, SMR-5L) and a synthetic cis -1,4-polyisoprene (IR, Natsyn 2200, The Goodyear Tire & Rubber Company) were crystallized at −25 °C at various strains, and then slowly melted. Crystallization was somewhat slower for IR under all conditions, taking two to three times…
In the soda‐lime‐silica glass family, the effect of each constituent of the composition on the brittleness was first investigated. Vickers indentation was employed to estimate the brittleness (ratio of harness ( H ) to fracture toughness ( K c )) by measuring the C / a ratios (where C and a are the characteristic crac…
Active sites for oxygen reduction were investigated at the interface of (LSM)/yttria‐stabilized zirconia (YSZ). Isotopic oxygen ( 16 O/ 18 O) exchange under cathodic polarization and secondary‐ion mass spectrometry (SIMS) analysis were examined to visualize the oxygen reduction active sites. The LSM mesh pattern elect…
Hertzian (spherical) indentation experiments were carried out in a graded alumina‐glass composite whose Young's modulus increased with depth beneath the indented surface. An in situ processing method involving impregnation of a dense, fine‐grained alumina by an aluminosilicate glass was employed to fabricate such a co…
The adsorption of the anionic dyes orange IV, orange G and xylenol orange on chitin was studied, employing the Langmuir isotherm. The adsorption parameters were determined utilizing various linear regressions of the isotherm. The results showed that the adsorption capacity is dependent on pH. In acid pH, the polymer a…
Malate dehydrogenase (MDH) (EC 1.1.1.37) catalyzes the conversion of oxaloacetate and malate. This reaction is important in cellular metabolism, and it is coupled with easily detectable cofactor oxidation/reduction. It is a rather ubiquitous enzyme, for which several isoforms have been identified, differing in their s…
d - and l -lactic acid oligomers were synthesized by polymerization of d - or l -lactide using 2-(2-methoxyethoxy)ethanol (MEE) and stannous octoate as initiator and catalyst, respectively. The average degree of polymerization (DP av ) of the oligomers could be tailored by the monomer/initiator ratio. HPLC and GPC ana…
We have considered the effects of non magnetic impurities and interface roughness on the interlayer coupling between magnetic layers in metallic multilayers. The two types of defects alter the interlayer coupling in quite different ways. Elastic electron scattering by impurities in the non magnetic spacer layers betwe…
Thin films with cobalt ferrite layers on thermally oxidized silicon wafers were fabricated by a sol-gel method. Magnetic and structural properties of the films were investigated with an x-ray diffractometer, a vibrating sample magnetometer and atomic force microscopy. The crystallization temperature for Co ferrite thi…
We show that a finite interface thickness in an isothermal phase-field model for alloy solidification introduces a chemical potential gradient in the interfacial region and the solute trapping effect, and the relationships between material properties and parameters in the phase-field equation can be determined at a lo…
Surface enhanced Raman scattering (SERS) is being increasingly used for the study of the structural properties of conducting polymer thin films. It is generally accepted that the enhancement process has an electromagnetic origin, arising from the excitation of surface plasmons in the metal support on which the polymer…
We have investigated the nature of epitaxy, defects (dislocations, stacking faults, and inversion domains), and heterointerfaces in zinc oxide films grown on (0001) sapphire and explored the possibility of using it as a buffer layer for growing group III nitrides. High quality epitaxial ZnO films were grown on sapphir…