Materials Literature
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The cell seeding density and spatial distribution in a 3-D scaffold are critical to the morphogenetic development of an engineered tissue. A dynamic depth-filtration seeding method was developed to improve the initial cell seeding density and spatial distribution in 3-D nonwoven fibrous matrices commonly used as tissu…
The temperature dependencies of the resistivity and magnetization of a series of Ni 2+ x Mn 1- x Ga ( x = 0-0.09) alloys were investigated. Along with the anomalies associated with ferromagnetic and martensitic transitions, well-defined anomalies were observed at the temperature of premartensitic transformation. The p…
Constitutive equations are derived for the viscoelastic behavior of particle-reinforced rubbers at isothermal loading with finite strains. A filled rubber is thought of as a composite medium where inclusions with high and low concentrations of junctions between chains are randomly distributed in a host matrix. The inc…
The photochemical and electrochemical properties of four chlorin-C60 or porphyrin-C60 dyads having the same short spacer between the macrocycle and the fullerene are examined. In contrast with all the previous results on porphyrin-fullerene dyads, the photoexcitation of a zinc chlorin-C60 dyad results in an unusually…
The synthesis and characterization of two members of a family of porous magnetic materials is described. The structures of Co4(SO4)(OH)6(C2N2H8)0.5*3H2O and Co4(SO4)(OH)6(C6N2H12)0.5*H2O and their thermal stability can be tailored via the choice of organic pillar. The interactions between the pillaring agent and the c…
The electron affinity (EA) $\ensuremath{\chi}$ of single crystal diamond (100) is determined as a function of hydrogen and oxygen coverage by a combination of work function and photoemission experiments. For the fully hydrogenated (100)-$(2\ifmmode\times\else\texttimes\fi{}1):\mathrm{H}$ surface an EA of $\ensuremath{…
The synthesis and study of so-called “nanoparticles”, particles with diameters in the range of 1−20 nm, has become a major interdisciplinary area of research over the past 10 years. Semiconductor nanoparticles promise to play a major role in several new technologies. The intense interest in this area derives from thei…
Abstract A hinged, photoresponsive polypeptide (PAzP) was prepared and the effect of the photochromic hinge on the dielectric and photoisomerization behavior of the polymer in solution was probed. Polymerization of N ‐carboxyanhydride of γ‐benzyl‐ L ‐glutamate was carried out with two different bifunctional photochrom…
Pt-containing nanocomposite catalysts were synthesized by deposition of [Pt(NH3)4]2+ complex ions on several samples of Al pillared clays, differing in the nature of the parent clay and in the pillaring procedure. In particular, we compared classical Keggin-Al13 pillared clays, with a rather open microporous network,…
The effect of a magnetic field ${B}_{\ensuremath{\perp}}$ on the resonant tunneling between different magnetic states of the molecular clusters ${\mathrm{Fe}}_{8}$ and ${\mathrm{Mn}}_{12}$ has been studied by measuring the magnetic specific heat of these compounds between $0.1 \mathrm{K}$ and $6 \mathrm{K}.$ At zero f…
We present electron diffraction and high-resolution electron microscopy measurements characterizing the structure of a Bi-based layered manganite. The crystal structure of ${\mathrm{Bi}}_{0.75}{\mathrm{Ca}}_{3.25}{\mathrm{Mn}}_{3}{\mathrm{O}}_{10}$ is orthorhombic and A centered (space group ${A2}_{1}22),$ with lattic…
Abstract Dendritic polyarylether 2‐bromoisobutyrates with different generations (Gn‐Br, n = 1–3) were prepared by reaction of the Fréchet‐type hydroxyl‐terminated polyarylether with 2‐bromoisobutyryl bromide and triethylamine. Gn‐Br as a macroinitiator for the controlled free‐radical polymerization of N ‐phenylmaleimi…
A series of dinuclear (phosphine)gold(I) complexes of the ambidentate 1,3,4-thiadiazoledithiolate ligand (SSS) were prepared in high yield from the corresponding (phosphine)gold(I) chlorides and K(2)(SSS) in methanol. While mononuclear components (R(3)P)AuCl with R(3) = Ph(3), Ph(2)Py, or Me(3) (1-3) gave open-chain c…
Two open-framework ammonium−iron borophosphates, black colored (NH 4 ) 0.4 Fe II 0.55 Fe III 0.5 (H 2 O) 2 [BP 2 O 8 ]·0.6H 2 O ( 1a ) (pale gray colored 1b with a powder X-ray diffraction pattern indicating an isotype relationship was also observed) and pale pink colored NH 4 Fe III [BP 2 O 8 (OH)] ( 2 ), were synthe…
ZrO 2 nanoparticles (10−400 nm) were produced by laser ablation deposition and studied by transmission electron microscopy. The particles were predominantly tetragonal (t-) phase with spherical shape. Relatively large t-ZrO 2 particles, however, showed {111} and {100} faces and tended to attach over well-developed {11…
Abstract A new fracture behaviour is described for acrylonitrile–butadiene rubber/clay nanocomposite. The nanocomposite is prepared by melt mixing the organo‐treated montmorillonite into the rubber matrix, together with a peroxide curative, and crosslinked by conventional compression moulding for typical rubbers. A co…
Pt nanoparticles supported in nanoporous Al 2 O 3 catalyst are prepared by reduction of K 2 PtCl 4 solution using H 2 in the presence of Al 2 O 3 and poly(acrylic acid) as capping material. After thorough washing with water to remove Pt nanoparticles located on the external surface of the Al 2 O 3 and drying at 70 °C…
A series of novel azo polyelectrolytes have been synthesized based on an extremely reactive precursor polymer, poly(acryloyl chloride) (PAC), prepared from acryloyl chloride by radical polymerization. The precursor polymer was post-functionalized by the Schotten-Baumann reaction of PAC and several aromatic azo reactan…
We introduce a first-principles scheme for calculating a core-hole potential for core-electron excitations. The scheme incorporates atomic and solid-state screening in the description of core excitations in several materials. We compare the results calculated using our scheme to experimental x-ray absorption and inela…
Abstract A series of terpolymers were synthesized by the chemical oxidative polymerization of m ‐phenylenediamine (MPD), o ‐anisidine (AS), and 2,3‐xylidine (XY) in hydrochloride aqueous medium. The yield, intrinsic viscosity, and solubility of the terpolymers were studied by changing the MPD/AS/XY molar ratio from 10…