Materials Literature
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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…
Nanoscopic polyaniline particles were successfully synthesized in a stable water–oil microemulsion. FT-IR spectra showed that sodium dodecylbenzenesulfonate (SDBA) acted both as surfactant and dopant in the acidic reaction media. Wide-angle X-ray diffraction, UV–visible spectra and thermal analysis suggested that the…
The vertical ionization potentials (IP's) of a variety of free-base and zinc porphyrins and free-base and zinc phthalocyanine, including all those for which experimental ultraviolet photoelectron spectral (UPS) data are presently known, are computed using six semiempirical molecular orbital methods. Koopman's Theorem…
Poncirin was isolated from water extract of the fruits of Poncirus trifoliata and metabolized by human intestinal bacteria. The inhibitory effect of poncirin and its metabolites by these bacteria on the growth of Helicobacter pylori (HP) was investigated. Among them, ponciretin (5,7-dihydroxy-4'-methoxyflavanone), the…
Recombination coefficients (γ) of Br and F atoms have been measured for crystalline Si, quartz, photoresist, anodized aluminum, poly-Si, WSix, tungsten and stainless steel surfaces for a range of temperatures. The γBr and γF values are compared to our previously reported measurements of γCl [G. P. Kota, J. W. Coburn,…
This issue of “FORMA ” presents an English translation of Haeckel’s book “Crystal Souls”, with Alan Mackay’s introduction and detailed annotations. The tanslation was accomplished by Alan, my respectable old friend since 1950’s. When this book published in 1917, Haeckel tried to attract people to beautifully organized…