Materials Literature
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In an effort to improve the physical accuracy of models of the thermodynamics of silicate melts, we describe a systematic study of the extent of modifying cation mixing, using 17 O 3QMAS NMR, in a series of Ca-Mg and K-Mg silicate glasses. The spectra for the mixed cation Ca 2-2x Mg 2x Si 2 O 6 glass show that only on…
Abstract The effect of clay loading on the mechanical behavior and melt state linear viscoelastic properties of intercalated polycarbonate (PC) nanocomposites was investigated. At low frequencies, the linear dynamic oscillatory moduli data revealed diminished frequency dependence with increasing nanoclay loading. The…
Due to their excellent thermal and mechanical properties silicon‐based ceramics and composites are prime candidates for high temperature structural applications. In this communication the authors report for the first time that amorphous silicoaluminum carbonitride (SiAlCN) ceramics possess anomalously high resistance…
In this study, vascular-like tubular tissues called biotubes, consisting of autologous tissues, were prepared using in vivo tissue engineering. Their mechanical properties were evaluated for application as a small-caliber artificial vascular prosthesis. The biotubes were prepared by embedding six kinds of polymeric ro…
Field emission displays (FED) are drawing attention as one of the most promising flat panel displays. Currently, the development stage of Spindt-type FEDs with Mo emitter is close to an end. The monocolor Spindt-type FEDs are being supplied to the market, and the color FEDs are ready for mass production. FED is also e…
Defect structures of plastically deformed nanocrystalline Pd investigated by high-resolution transmission electron microscopy are presented. Material with an average grain size of about 15 nm was prepared by inert-gas condensation, and this was plastically deformed by cold rolling up to a true strain of 0.32 at a stra…
The fast relaxation measured by quasielastic neutron and light scattering on the picosecond to nanosecond time scales when expressed as mean square displacement as a function of temperature shows a change in slope at or near the conventional glass transition temperature in a manner like those of the enthalpy and volum…
An ultra‐high‐temperature ceramic (UHTC) based on HfB 2 was produced. The microstructure consisted of fine and regular diboride grains (2 μm average size), with SiC particulate distributed intergranularly, not rarely in clustered formation, and low levels of secondary phases were identified. The resulting thermo‐mecha…
Demonstration of a 2.5-kV diamond diode is provided by electrical measurements using a circular gold Schottky contact, with an area >1 mm/sup 2/, on large area freestanding single-crystal diamond consisting of a thin high purity layer (1/spl times/0/sup 19/ [B]/cm/sup 3/) substrate with an ohmic back contact. The diod…
The parameters of reactive pulsed laser deposition were successfully optimized for fabrication of vanadium dioxide thin films. It is observed that the O2 concentration in Ar gas and the total deposition pressure are critical in stabilizing the single VO2 phase. Thermochromic VO2 and V1−xWxO2 (x=0.014) thin films were…
The blood-brain barrier (BBB) efficiently restricts penetration of therapeutic agents to the brain from the periphery. Therefore, discovery of new modalities allowing for effective delivery of drugs and biomacromolecules to the central nervous system (CNS) is of great need and importance for treatment of neurodegenera…
We describe the solution growth of a series of discrete sized generations of Au nanoparticles by the heterogeneous deposition of atoms onto monodisperse seed nanocrystals. The growth process was studied using size-exclusion chromatography (SEC) and transmission electron microscopy (TEM). The size dispersion of each ge…
BACKGROUND AND AIM OF THE STUDY: Recent heart valve tissue engineering efforts have involved populating scaffolds with cells isolated from vascular sources, though it is unclear whether cells from valvular origins behave similarly to vascular cells. The study aim was to compare the phenotype of porcine aortic valve in…
A scaleable perfusion bioreactor has been developed for tissue engineering of small diameter arterial constructs. This modular bioreactor allows for dynamic sequential seeding of smooth muscle and endothelial cells, biomechanical stimulation of cells during culture, and monitoring of tissue growth and maturation. Bovi…
There is abundant experimental and theoretical evidence of the fact that the primary optical excitation in conjugated polymers is a singlet exciton with a binding energy of typically 0.5 eV. In the absence of excess photon energy, free or geminately bound charge carriers (polarons) have to be generated from relaxed ex…
The commercial value of a quantity of yarn depends on two things, the length and the fineness. This article describes how practical methods of measuring these quantities led to systems of units that were noteworthy mainly for their profusion and complexity. The story covers the period from 1600 to the present day, and…
On the basis of the model of non-equilibrium grain boundary segregation induced by tensile stress, a set of kinetic equations is derived to formulate this process. These kinetic equations allow excellent simulation of the grain boundary segregation of phosphorus and sulphur observed in steels subjected to low tensile…
Theoretically predicted and experimentally observed infraredinduced second-harmonic generation of glasses in the mid-infrared spectral region can be described by fifth-order nonlinear optical susceptibility. The effect is observed in the mid-IR region when the value of the electronic energy gap is comparable to the en…
We have simulated and constructed a one-dimensional metamaterial composed of a periodically loaded transmission line that exhibits both negative and positive group velocities in a band of effective negative index of refraction. The negative group velocity or, equivalently, the negative group delay, is demonstrated the…
We report on the structural, frequency dependent ac susceptibility, dc magnetization and magnetoresistance (MR) measurements on polycrystalline samples of La0.86Ca0.14Mn1-yCryO3(y = 0, 0.1 and 0.2) prepared by sol-gel technique. For y = 0, a paramagnetic to ferromagnetic transition was observed at TC = 185 K. For y =…