Materials Literature
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In this article, we show that human endothelial progenitor cells (EPCs) in circulating peripheral blood may be a novel cell source for a cell-incorporated engineered vascular graft. Cultures of human peripheral blood mononuclear cells collected by the density gradient technique developed highly proliferative EPC colon…
Abstract This article divides the synthetic routes leading to dendronized polymers into two main categories (attach‐to and macromonomer) and compares their respective advantages and disadvantages. It gives a comprehensive overview on the kind of structures presently available and also spans the bridge between both pol…
Tunable lowpass and bandpass lumped-element filters employing barium-strontium-titanate (BST)-based capacitors are presented. A new metallization technique is used, which improves the quality factor of the tunable BST capacitors by a factor of two. The lowpass filter has an insertion loss of 2 dB and a tunability of 4…
Recently, three-dimensional composite periodic media comprising split-ring resonators (SRR) and thin wires have been shown to exhibit a negative refractive index in the frequency range around the SRR resonance. In this letter, we propose transmission line models for studying and interpreting the electromagnetic propag…
A relationship between the adhesion of a Cu conductor to its surrounding medium, the electromigration drift velocity, and lifetime in a conventional electromigration test has been demonstrated. Lifetime measurements demonstrate that the drift velocity and the activation energy for mass transport along an interface cor…
Abstract Modern materials and their properties are often characterized by varying degrees of disorder. Routine crystallographic structure solution only reveals the average structure. The study of Bragg and diffuse scattering yields the local atomic arrangements holding the key to understanding increasingly complex mat…
The general term biomineralisation refers to biologically induced mineralisation in which an organism modifies its local microenvironment creating conditions such that there is chemical precipitation of mineral phases extracellularly. Most usually this results from an oxidation or reduction carried out by some microbi…
Curie temperatures of the diluted magnetic semiconductors (Ga, Mn)As, (Ga, Mn)N, (Ga, Cr)As and (Ga, Cr)N are evaluated from first principles. The electronic structure is calculated in the local spin density approximation by using the Korringa-Kohn-Rostoker method combined with the coherent potential approximation to…
Atomic layer deposition (ALD) is an ideal technique for fabricating composite thin films. The thickness and stoichiometry of composite thin films prepared using ALD is dependent on the underlying surface chemistry during ALD film growth. A set of ZnO/Al 2 O 3 alloy films was prepared by ALD in a viscous flow reactor u…
Crystal growth during hydrothermal coarsening of mercaptoethanol-capped nanocrystalline ZnS occurs via a two-stage process. In the first stage, the primary particle quickly doubles in volume. The initial growth rate can be fitted by an asymptotic curve that cannot be explained by any existing power-law dependence kine…
Bottom-gate-type thin film transistors using ZnO as an active channel layer (ZnO–TFT) have been constructed. The ZnO layers were deposited using pulsed laser deposition at 450 °C at an oxygen pressure of 3 m Torr, and the material that was formed had a background carrier concentration of less than 5×1016 cm−3. A doubl…
Abstract Block copolymers are the focus of a great deal of research activity in contemporary macromolecular science. This is attributable to a range of fascinating fundamental issues associated with understanding self‐assembly processes in both solution and in bulk, coupled to an adventitious convergence of substantia…
Efficient solid state energy conversion based on the Peltier effect for cooling and the Seebeck effect for power generation calls for materials with high electrical conductivity σ, high Seebeck coefficient S, and low thermal conductivity k. Identifying materials with a high thermoelectric figure of merit Z(= S2σ/k) ha…
Section 1 - Experimental Studies: Chapter 1 Vascular grafts - basic research and clinical applications Chapter 2 Biomechanics and hemodynamics of grafting Chapter 3 Characterization of grafts' mechanical properties relevant for hemodynamics Chapter 4 Hemodynamics in an end-to-end vascular prosthesis - the role of wall…
Abstract Poly(aramid silicone) (PAS) multiblock copolymers were synthesized by the low‐temperature solution polycondensation of isophthaloyl dichloride (IPC) and two diamines, diamino poly(dimethyl siloxane) (PDMS; number‐average molecular weight = 1680) and 3,4′‐diaminodiphenylether (3,4′‐DAPE), in tetrahydrofuran/di…
We present the experimental results for photoacoustic and optical absorption spectra of as-grown, air-annealed, and hydrogen-annealed yttrium aluminum garnet (YAG):Cr,Mg crystals. The experimental results were analyzed and discussed for both ${\mathrm{Cr}}^{3+}$ and ${\mathrm{Cr}}^{4+}$ centers in the host lattice wit…
The striking anisotropy observed in Huang scattering distributions near the intense Bragg reflections of ${\mathrm{La}}_{1.2}{\mathrm{Sr}}_{1.8}{\mathrm{Mn}}_{2}{\mathrm{O}}_{7}$ is shown to be the result of orbitally polarized polarons in the paramagnetic insulating state above ${T}_{C}.$ X-ray single-crystal diffuse…
Previously, we reported the milligram-scale synthesis of tetrabutylammonium- and polyoxoanion (P 2 W 15 Nb 3 O 62 9 - )-stabilized Ir(0) nanoclusters. To increase the isolable yield of this nanocluster catalyst material to near 1 g, experiments were carried out optimizing the key synthetic variables including the solv…
The electrostatic model of thresholdless V-shaped switching is able to explain the general low frequency (quasistatic) electro-optic behavior of smectic-C* ferroelectric liquid crystals (vFLCs). Here, dynamical equations based on the electrostatic model are developed which predict a vFLC cell's small-amplitude switchi…
The Stern−Volmer quenching constants ( K sv ) for poly(amidoamine)- (PAMAM-) based dendrimers (generations G0−G4) modified with (4, 8, 16, 32 and 64) pendant [Ru(bpy) 3 ] +2 (bpy is 2,2‘-bipyridine) chromophores have been measured in the presence of three nitroaromatic quenchers (2,4,6-trinitrotoluene = TNT, 2,4-dinit…