Materials Literature
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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…
Textile materials are increasingly used in various industries. In these applications, the surfaces of textile materials play a key role, because a range of performance properties depends on surface characteristics. As with many other types of materials, the surface properties of textiles can be readily altered by the…
Diamond-like carbon (DLC) has been established as a very favourable coating for joint prosthetics due to its low friction, high corrosion resistance and biocompatibility. The addition of dopants allows for the modification of several physical properties of DLC, whose relations to biocompatibility have not yet been tho…
A new series of zinc porphyrin-fullerenes bridged by flexible oligosilane chains ZnP-[Sin]-C60 (n = 1-5) was synthesized, and the photophysical properties of these molecules were investigated using steady-state and time-resolved spectroscopic methods. The spectral observations can be well explained by assuming the coe…
To better understand thermal transport at nanoscale point contacts such as the tip-sample contact of a scanning probe microscope and at the contact between a nanotube and a planar surface, we have used a nonequilibrium molecular dynamics (MD) method to calculate the temperature distribution and thermal resistance of a…
This study investigated the differences between knitted fabrics made from compact and conventional ring-spun yarns. 100% cotton yarns, produced from the same cotton blend, were spun according to compact and conventional ring spinning principles in two different yarn counts and twist factors. Three different knitting s…
The insulation in a DC cable is subjected to both thermal and electric stress at the same time. While the electric stress is generic to the cable, the temperature rise in the insulation is, by and large, due to the ohmic losses in the conductor. The consequence of this synergic effect is to reduce the maximum operatin…
The effect of silica filler and moisture absorption on the structural characteristics of tree growth in epoxy resin has been investigated. The physical properties of the resin were varied by changing its filler concentration and immersed in distilled water at 50degC. The fractal dimension of the electrical tree and it…
About 15 years ago, the short risetime pulses caused by voltage source, pulse width modulated converters were first recognized as a cause of stator winding insulation failure in low voltage motors. The root cause was found to be the large number of PWM voltage pulses from the drive, which caused partial discharges bet…
Abstract We have synthesized novel liquid-crystalline (LC)-conducting polymers by introducing LC groups into acetylene monomers and polymerizing them with Ziegler–Natta, metathesis, and rhodium-based catalysts. All polymers prepared were soluble in organic solvents and had a thermotropic liquid crystallinity character…
Yttria-stabilized zirconia single crystals were irradiated with a variety of different swift heavy ions (from 145MeV C to 2.6GeV U) in a broad fluence range (between 1011 and 1015cm−2). Surface profilometry measurements show that the out-of-plane expansion of the samples increases versus ion fluence up to an asymptoti…
We have developed a low-temperature formation technique for ferroelectrics (<500 °C), which is crucial for the ferroelectric random access memory (FeRAM) to be embedded in a leading-edge complementary metal oxide semiconductor (CMOS). A 53-nm-thick Bi 4 Ti 3 O 12 film was successfully formed by metalorganic chemical v…
BACKGROUND: Tissue-engineered heart valves have the potential to overcome the limitations of present heart valve replacements. This study was designed to develop a tissue engineering heart valve by using human umbilical cord blood-derived endothelial progenitor cells (EPCs) and decellularized valve scaffolds. METHODS:…