Materials Literature
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Abstract The technologically relevant aluminium alloy AA6016 was successfully processed using accumulative roll bonding to 8 cycles (∊ von Mises = 6.4) in order to obtain an ultrafine-grained microstructure with an average grain size of approximately 200 nm. With the aim of optimising the accumulative roll bonding pro…
The mechanism that limits the emission current of a carbon-nanotube-based cathode due to the temperature dependence of the emissivity of the nanotube is studied. This limitation has the character of thermal instability that shows up as an infinite increase in the emitter temperature after a certain emission current is…
In this study, a new extension of a micromechanical approach proposed recently by the authors is developed to predict the damaged behavior of polycrystals under various multiaxial cyclic loading paths. The model is expressed in the time dependent plasticity for a small strain assumption. With the framework of the cont…
Expensive polymer food packaging consisting of multilayer systems of different polymers will be increasingly replaced by cheap homopolymeric materials. Low-pressure plasma deposition of SiOx layers provides a promising alternative to achieve barrier properties on homopolymeric materials directly comparable to those of…
Synthesis of Au/TiO2 Core–Shell Nanoparticles from Titanium Isopropoxide and Thermal Resistance Effect of TiO2 Shell, Kwon, Hyun-Woo, Lim, Young-Min, Tripathy, Suraj Kumar, Kim, Byoung-Gyu, Lee, Min-Sang, Yu, Yeon-Tae
An automatic method for determining the breakdown strength of thin polymer films was evaluated. The equipment consists of a scanning electrode arm with which the breakdown voltage over the film sample is measured. The measurement electrodes were of solid brass and the ground electrode was of thin aluminum foil. Five d…
In the present work, the spectra of currents of thermostimulated depolarization for composite corona electret LDPE + ε vol % TlInSe 2 are obtained by the thermoactivation spectroscopy method [11] and their electret properties and change conditions are investigated.
Natural rubber was reinforced with sisal and oil palm fibers and composites were fabricated based on different fiber loading. Chemically modified fibers, namely, mercerized and silanized fibers, were also used to prepare composites. Biodegradation tests were carried out under soil burial conditions. It was seen that t…
The martensitic transformations in TiNi alloys were studied using molecular dynamics (MD) simulations. The modified embedded atom method was used with the pseudo monoatomic potentials, which included angular dependence of each atoms. The thermally induced B2 → B19′ martensitic and B19′ → B2 reverse martensitic transfo…
Multifunctional nanocontainers can be produced based on partially filled Fe-multi walled carbon nanotubes (MWCNTs). Using thermal decomposition ferrocene filled nanotubes can be grown aligned on substrates. The encapsulated metal nanowires have diameters of 5-30 nm and a length up to few microns. They consist of singl…
The characteristics of field-aged room temperature vulcanized (RTV) silicone rubber coatings were investigated for use in heavily contaminated areas with emphases on the antipollution flashover performance of aged RTV-coated insulators. An atomic absorption spectrophotometer and ion chromatography (IC) were employed t…
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Photophysical processes involving the higher electronic excited states of diamagnetic porphyrins and metalloporphyrins are critically reviewed. Intramolecular electronic relaxation of one-photon Soret-excited molecules in solution is now known to involve processes other than S 2 - S 1 internal conversion; dark electro…
The influences of Co-addition on phase transformation behavior and mechanical properties of TiNi alloys were investigated. Results indicate that, as a substitute for Ni, Co added to TiNi alloys can dramatically decrease the martensite transformation temperature, and R phase transformation and martensite transformation…
Relationships between Vickers microhardness, x‐ray and differential scanning calorimetry (DSC) crystallinity, x‐ray long period, and melting points were determined for ultrahigh molecular‐weight polyethylene (UHMWPE) of various histories (as‐produced, irradiated, annealed, and remelted). It was shown that the microhar…
The mechanism of field emission from a metal surface was well explained based on the quantum mechanics in early 20th century. Since then, various materials have been studied for field emitters. However, so far, we have been using only limited materials as a field emitter and an application in some area requires furthe…
We extend the cell-based approach of Sune to full percolation that is predictive down to 0.4nm. We resolve conflicting reports in the literature on the scaling behavior of the Weibull shape parameter with oxide thickness, and show that Weibull statistics can be violated if pre-existing traps are present.
The surface of 5.5 µm lactose particles was modified by gas phase reactions in a plasma enhanced chemical vapor deposition process to increase the flowability of the bulk solid. The particles were treated in the radio frequency plasma zone (RF) of a downer reactor, using a process gas mixture of oxygen, argon, and hex…
Hexamethyldisiloxane was used to deposit silicon dioxide thin films using a low frequency plasma reactor at low pressure as well as a dielectric barrier discharge (DBD) at atmospheric pressure. FT-IR, XPS, EIS, SEM and ellipsometry were used to analyse the samples. The results show that, at low pressure, the deposited…
Four series of high birefringence bistolane liquid crystals containing isothiocyanato termal groups were synthesized and characterized. As well as the phenyl group, both biphenyl and naphthyl moieties were introduced to enhance the birefringence. These bistolane compounds exhibit reasonably low melting points and high…