Materials Literature
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The use of fluoro substituents in liquid crystals has proved essential for the development of materials with optimised properties for advanced high technology devices. The small size and high polarity of a fluoro substituent can have some remarkable effects on the important physical properties of liquid crystals. Fluo…
The thermal conductivity and the temperature dependence of linear thermal expansion coefficient of Al4SiC4 sintered bodies were investigated from room temperature to 1200°C. Thermal conductivity decreased with the increase porosity. The thermal conductivity and linear expansion coefficient of highly densitied Al4SiC4…
Three high velocity joining methods are presented.They are projectile spot impact welding, electromagnetic crimping, and electromagnetic impact welding.Projectile spot impact welding utilizes high-speed bullet to impact metal sheets to a recessed die to achieve a solid state bonding.The bullet velocity ranges from 160…
Our exhaustive research on the preparation, characterization, materials properties and biodegradability of polylactide (PLA)/organically modified layered silicate (OMLS) nanocomposites has yielded results for PLA/montmorillonite (MMT) nanocomposites. Natural Na+-MMT modified with octadecylammonium cation, is used as a…
Four commercial non-ionic surfactant compounds, namely tween 80, 60, 40 and 20, were tested as inhibitors for corrosion of nickel in 1.0 M H 2 SO 4 solution. Weight loss measurements, potentiostatic polarization and cyclic voltammetry techniques were used in this study. It was found that all the four used compounds ac…
We have investigated atomic-scale effects of hydrogen atoms in α-Fe by means of ab-initio calculations and examined microscopic mechanism of hydrogen embrittlement in Fe-based materials. Our calculations indicate that accumulation of interstitial hydrogen in a tensile-stress-concentrated region ahead of a crack tip is…
Two signals have been observed in the ESR spectra of nanocrystalline MgO synthesized by an aerogel technique. These signals have been assigned to F+ centers in the nanocrystals and –O–˙CH2 radicals formed from residual methoxide groups present at the points of contact between the nanocrystals. The signal of F+ centers…
The etherification of glycerol with tert-butanol has been studied at the presence of catex Amberlyst 15 as catalyst. The maximum conversion of glycerol near 96% was reached at the temperature 90°C and at the molar ratio tert-butanol/glycerol = 4:1 after 180 min. Catalytic activity of Amberlyst 15 was compared with two…
A novel arylamine based hole transporting material (HTM) with tetraethylene glycol (TEG) side groups is reported. Lithium ions solubilised by the TEG groups are employed to modulate interfacial electron transfer reactions at a dye sensitised TiO2/HTM interface.
Abstract Growth rate of potassium sulfate crystals was studied in a fluidized bed crystallizer. Higher growth rates were observed at larger bed heights. Larger crystals grow faster than smaller size crystals due to the changed fluid dynamics. The growth rate was found to be very sensitive to the pH value of the soluti…
A key feature of the scanning vibrating electrode technique (SVET) in the study of localized corrosion is that it is nonperturbing and therefore represents a spatially resolved measure of the corrosion activity in the absence of external factors. SVET probe vibrational amplitudes of μm are shown to increase the rate o…
We have applied a photoacoustic (PA) technique to study the thermal properties of porous silicon (PS) films formed on p-type Si substrates by electrochemical anodic etching with greatly different porosities (20%–60%). From the dependence of the PA signals on the modulation frequency of excitation light measured under…
Thermal diffusivity values of molten germanium and silicon were measured by a laser flash method. Simple but useful sample cell systems were developed to keep the molten germanium and silicon shape uniform for a given thickness. In the present experimental condition, it is necessary to consider the effect of not only…
We demonstrate ohmic contacts to SiC using carbon films after thermal annealing. Carbon films are deposited on 4H-SiC and 6H-SiC substrates using a radio frequency sputtering method. The carbon/SiC samples convert from Schottky behavior to ohmic behavior after annealing in the temperature range from 1150 to 1350°C. Na…
Well-ordered kaolinite from the Brazilian Amazon Region (State of Pará) was initially reacted at 60 °C with a water dimethylsulfoxide mixture. After washing and characterisation, the resulting material was washed several times with methanol and in the final step with water. The water molecules displace the previously…
This paper investigates the charge versus voltage (q-v) curves of surge corona on transmission lines. Two measurement methods of the q-v curves are proposed, and field test results are shown to validate the methods. Since the new methods do not require a charge-measuring conductor, such as a corona cage, the q-v curve…
High-density amorphous ice (HDA), made by compression of hexagonal ice at 77 K, was heated at a constant pressure of 0.81 GPa up to 183 K and its phase transition followed by displacement-temperature curves. The crystalline phases, recovered at 77 K and 1 bar, were characterized by X-ray diffraction. Pure D 2 O ice IV…
In order to examine the existence of the metal–insulator transition, structural transition and magnetostriction effect, ultrasonic velocities and attenuation measurements have been made on La0.67Sr0.33MnO3 perovskite manganite material over a wide range of temperatures from room temperature (298 K) to 460 K. The varia…
Jute yarns were treated with an alkoxy silane monomer 3-(trimethoxysilyl) propylmethacrylate under UV radiation. The monomer concentration and radiation intensity were optimized with respect to the extent of grafting and mechanical properties of the grafted (silanized) jute yarn. The enhanced tensile strength by 159%,…
This paper documents two projects funded through the Federal Highway Administration’s Innovative Bridge Research and Construction (IBRC) program. The IBRC program was developed to assist bridge owners in applying emerging technologies in bridge engineering. In these projects, the Iowa Department of Transportation empl…