Materials Literature
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Thin fibers having diameters ranging from 25 nm to 2 micro-m were successfully electrospun from solutions of polylactides (PLA) having different molecular weights both in entangled and aligned fiber forms. The latter aligned fibers were collected with a new target comprising a rotor around which several fins were atta…
Due to its outstanding thermal properties, diamond is an attractive alternative to silicon as a monochromator material for high intensity X‐ray beams. To date, however, the practical applications have been limited by the small size and relatively poor crystallographic quality of the crystals available. The ESRF Diamon…
The development of a safe regeneration procedure which circumvents large temperature excursions during the exothermic regeneration is the current major technological challenge in the operation of diesel particulate filters. The cause of this local hot zone formation is still an open question. The maximum temperature a…
This paper presents a direct algorithm to implement non-local gradient-enhanced damage mechanics theories in the existing finite element codes with minor modifications and without the need to formulate a higher-order element. This method extends the algorithm of Abu Al-Rub and Voyiadjis (2005) to gradient-dependent da…
The purpose in this study is to investigate the effect of microstructure on the unique hardening behavior of dental silver alloy, Ag-20Pd-14.5Cu-12Au (mass%), fabricated by hot rolling process (AS material), which is in as-received condition, and liquid rapid solidification (LRS) process (LRS material). The following…
Reactions of laser-ablated copper atoms with carbon monoxide and dinitrogen in excess argon have been investigated by matrix-isolation infrared spectroscopy. The NNCuCO and (NN)(2)CuCO complexes, as well as copper carbonyls, are formed as reaction products during sample deposition and further annealing whereas no copp…
A partial cation exchange reaction between CdTe nanoparticles and Bi(3+) ions gives rise to spontaneous formation of two-dimensional Bi(2)Te(3)/CdTe nanosheets. The average size and thickness of the nanosheets are around 200 and 6.9 nm, respectively. Both CdTe and Bi(2)Te(3), which are there as the form of nanoparticl…
The adsorption and reaction of CO on SrTiO 3 (100) surface with and without surface oxygen vacancy are investigated by the first-principles calculation based on the density functional theory. The calculated results reveal that the oxygen vacancy site prefers to the activation of the C-O bond. The adsorption energies i…
The electronic specific heat coefficient γ , and the high field susceptibility χ hf of the L 2 1 phase in Co-based Heusler alloys were investigated in order to relate these properties to the spin polarization P . The γ -values of Co 2 CrGa, Co 2 MnGa and Co 2 FeGa alloys are comparable to the theoretical values of the…
The charge transfer excited state of a mechanically interlocked [2]rotaxane (R(4+)) with a donor 1,5-dioxynaphthalene (DNP) unit in the rod and the acceptor cyclobis(paraquat-p-phenylene) (CBPQT(4+)) ring component, along with the analogous non-interlocked [2]pseudorotaxane (P(4+)), is studied by resonance Raman spect…
The dynamic process of cold crystallization of amorphous poly(trimethylene terephthalate) (PTT) was investigated with resonance light scattering (RLS). By using an enhanced scattering peak at 329 nm, which was in close proximity to the absorption band of PTT film, density fluctuation due to gradual transition from amo…
The dependences of the internal friction and the Young’s modulus defect of polycrystalline indium on the oscillatory strain amplitude have been studied over a wide range of temperatures (7–320 K) and oscillatory strain amplitudes (10 −7 −3.5 × 10 −4 ) at oscillatory loading frequencies of about 100 kHz. It has been re…
The potential energy surfaces (PES), energies E , and activation barriers h of elementary reactions of dissociative addition of CH 4 and C 2 H 6 molecules to the Al 12 Ti cluster with a marquee structure in the singlet and triplet states were calculated within the B3LYP approximation of the density functional theory u…
This work addresses the resistivity increase in Cu interconnects with decreasing line width. Recent published resistivity data for Cu interconnect lines is found to be accurately modeled by a fixed surface scattering specularity parameter, p = 0.52, and a grain boundary reflection coefficient, R = 0.43. In this model,…
The influence of compacting pressure on the structure and mechanical properties of sintered ceramics based on weakly crystalline potassium polytitanate with a composition close to K 2 O · 6TiO 2 has been studied. It is established that an increase in the pressure during the uniaxial cold pressing of compacts leads to…
Analogous to multiwalled carbon nanotubes, nitrogen-doped carbon nanotube cups (NCNCs) have been synthesized with defined volumetric parameters (diameter and segment lengths) by controlling the catalyst particle size and the concentration of nitrogen precursor utilized in the chemical vapor deposition (CVD) reaction,…
A series of materials based on the perovskite Ln 0.435 Ba 0.145 Sr 0.4 Fe 0.8 Co 0.2 O 3 − δ system ( Ln = La 1 − x − y Pr x Sm y ) has been characterized as intermediate temperature solid oxide fuel cell (IT-SOFC) cathodes. Among the different La, Pr, and Sm combinations, those containing at a time Sm and La or alter…
In this work, the real component of the relative permittivity and the loss tangent of epoxy resin with and without inorganic nano-fillers are determined by dielectric spectroscopy. The nano-fillers used in this study were alumina (Al2O3), silica (SiO2) and titania (TiO2). The dielectric spectroscopy measurements were…
The use of traditional inorganic fillers and pigments for both filling and coating applications in papermaking may have certain limitations in such aspects as recyclability and combustibility. Novel renewable organic fillers and pigments derived from natural resources can possibly be completely recyclable, combustible…
We report an experimental and theoretical lattice-dynamics study of yttrium orthovanadate YVO4 up to 33 GPa together with a theoretical study of its structural stability under pressure. Raman-active modes of the zircon phase are observed up to 7.5 GPa, where the onset of an irreversible zircon-to-scheelite phase trans…