Materials Literature
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Analytic expressions for the eigenvalues for the four-wave components at an oblique angle of light incidence inside a randomly oriented anisotropic magneto-optic dielectric medium are reported explicitly. In particular, these solutions are valid as long as the dielectric function tensor consists of a symmetric and an…
Rat hepatocytes were cultured onto the surface of various amorphous biodegradable polymers composed of lactic acid and glycolic acid which were partially surface hydrolyzed by treating with sodium hydroxide. The polymer surface progressively became more hydrophilic with increasing NaOH treatment time, which was confir…
The preparation of ethylenedithiotetrathiafulvalenes (EDT-TTF) directly functionalized on the TTF core with a primary, secondary or tertiary amide or an hydrazide functional group is described. The X-ray crystal structures of EDT-TTF-CO 2 H, EDT-TTF-CONH 2 , EDT-TTF-CONHMe and EDT-TTF-CONMe 2 are reported. The solid s…
Neutron powder diffraction has been used to examine the crystal structure of the perovskite , at room temperature, and then at elevated temperatures to 1673 K. The orthorhombic structure at room temperature ( Pbnm , a = 5.5245(1) Å, b = 5.4922(1) Å, c = 7.7740(2) Å) was confirmed. At temperatures from about 420 K the…
Monotonic tension, creep, and fatigue tests of a composite where a silicon carbide (SiC) matrix that contains glass‐forming, boron‐based particulates has been reinforced with Hi‐Nicalon ™ fiber (Hi‐Nicalon ™ /SiC) were conducted in air at 1300°C, and creep tests also were conducted in argon at 1300°C. The ultimate ten…
The synthesis and crystal structures of two isostructural Mn(III)Ln(III) pivalates (Ln = Gd, Dy) are reported; magnetic data are presented for [Mn2Gd2O2(O2CCMe3)8(HO2CCMe3)2(MeOH)2], the susceptibility behaviour being dominated by strong antiferromagnetic coupling between the di-µ-oxo-bridged Mn(III) centres; this com…
Strong negative thermal expansion has been found for the pure SiO 2 zzeolites ITQ-1 (α v =–12.1×10 –6 K –1 ), SSZ-23 (α v =–10.3×10 –6 K –1 ) and ITQ-3 (α v =–11.4×10 –6 K –1 ) from 50 to 500 °C and above.
‘Dimeric’ discogens have been synthesised which have two triphenylene nuclei, each of which bears five β-OC 6 H 13 substituents, which are linked through the remaining β positions by a flexible O(CH 2 ) n O polymethylene chain (n=3-16). Calculations show that the minimum chain length for bridging between columns in th…
Thermal desorption of hydrogen from high-purity iron was observed after heat treatments at 470–870 K under a hydrogen pressure of 1.7 GPa. A total of 0.1–1.5 at% trapped hydrogen, with its amount increasing at higher holding temperatures, was desorbed in five stages. The most prominent one, occurring at 400–440 K, was…
All mechanical heart valves (MHV) are thrombogenic. Application of surface modification technology to reduce the incidence of thrombus formation on MHV is a novel undertaking. This requires collaboration within the bioengineering and cardiothoracic surgery fields. From reviewing results of recent and past investigatio…
The effect of insitu O2 exposure on TiO2(110)-supported Ag nanoclusters was investigated using X-ray photoelectron spectroscopy (XPS) and scanning tunneling microscopy (STM). An oxygen-induced cluster ripening was observed by STM after Ag/TiO2(110) was exposed to 10.00 Torr O2 for 2 h in an elevated-pressure reactor.…
Poly[2,5-bis(3,4-ethylenedioxy-2-thienyl)pyridine] exhibits multi-color electrochromism via easily accesible p- and n-type doping, and can be switched between a pale blue reduced state, a red neutral state, and a blue–purple oxidized state.
The triboluminescence of three non-ionic europium complexes, Eu(TTA)3·bipy (1), Eu(TTA)3·dia (2) and Eu(DBM)3·dmbp·H2O (3) (TTA = 2-thenoyltrifluoroacetonate, DBM = dibenzoylmethanate, bipy = 2,2′-bipyridine, dia = 4,5-diazafluoren-9-one, dmbp = 4,4′-dimethyl-2,2′-bipyridinate), was observed. Structure determinations…
New complexes with 1,2,4-triazole and end-on azido bridging ligands, [Cu3(atrz)2(N3)6] 1 and [Cu(atrz)2(N3)]NO32 (atrz = 4-amino-1,2,4-triazole), have been prepared and structurally determined. Complex 1 has a linear trinuclear copper(II) structure with bridging bond angles Cu–N–N (atrz) [119.3(3) and 123.4(3)°], and…
A simple extraction method effectively measures the changes in hand resulting from different fabric types, flame retardant (FR) finishes, and fabric wetness. The effects of FR finishes and wetness on the original fabric hand are inconsistent in terms of the direction of increase or decrease depending on the fabric and…
The dynamics of a surface-confined drop in a simple shear field has been studied, pursuing the dissipative particle dynamics (DPD) simulation approach. The shear field induces contact angle hysteresis in the drop, the degree of hysteresis increasing with the shear rate. At shear rates exceeding a critical value, the d…
Carbon nano-filament formation in hydrocarbon and syngas based catalytic processes is fatal for supported metal catalysts as this leads to deactivation and crushing, and hence limitation of carbon deposition has been a major topic in catalysis.1–5 Recently, the deliberate preparation of catalytically grown nanocarbons…
Photoexcitation of a Zn–tetraphenyl porphyrin–fullerene complex leads to electron-transfer with very long lifetimes of the charge-separated pairs.
We consider radial hedgehog equilibrium configurations of the tensor order parameter in spherical droplets of nematic liquid crystals modeled by free energies of the Landau--de Gennes type. We show that such configurations must become unstable at sufficiently low temperatures in droplets of sufficiently large radii fo…
Recent advances in sol-gel processing, with the aim of porous ceramic oxide preparation and applications in catalysis and membrane separation, are reviewed. Recent results from our group in porous solid preparation are presented. Three topics of particular interest are reported which highlight the potential of sol-gel…