Materials Literature
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A convenient immobilisation of triazacyclononane ligands on a glycidylated surface leads to a new group of active, heterogeneous manganese epoxidation catalysts.
We report the preparation of transparent gels from concentrated sols of CdS nanocrystals. The principles of our method can be applied to other systems, enlarging the domain of the inorganic sol–gel process which so far has been restricted mainly to oxides.
The title compound (1) crystallites in the space group Pmn2(1) with a = \n13.110 (3), b = 5.813(1) and c = 6.482(1) Angstrom. Its crystal \nstructure was redetermined from three-dimensional single-crystal data \nto a final R-value of 0.0221. The Cd2+ ion is tetrahedrally coordinated \nto two sulfur ato…
Abstract: All lenses, whether for light or for electrons, have aberrations that limit their performance. In light optics the invention of the achromat over 200 years ago solved the problem of correcting spherical and chromatic aberrations; however, correcting aberrations of electron lenses remains a challenge. Spheric…
Polyaniline (PAN) and polypyrrole (PPY) were analyzed by X-ray photoelectron spectroscopy (XPS) and bulk analytical techniques. A systematic comparison of the results was carried out to determine the effects of anion size, synthesis methods, and the nature of the polymer (powder or film) on the variation between the s…
The tubular design of solid oxide fuel cells (SOFCs) and the materials used therein have been validated by successful, continuous electrical testing over 69,000 h of early technology cells built on a calcia-stabilized zirconia porous support tube (PST). In the latest technology cells, the PST has been eliminated and r…
The construction of nanometric, dendritic macromolecules by bis(2,2′:6′,2″-terpyridine)ruthenium(ii) connectivity is investigated. The assembly methodology, which incorporates both the control of metal complexation sites and degree of flexibility within the linkages, has been demonstrated.
Experimental observation and study of light induced relief gratings in chalcogenide glasses is presented. Holographic exposure of the glass film by near bandgap light leads to a real-time periodic thickness self-expansion without further processing. The dynamics of surface modulation is not monotone with respect to th…
2-(Dimethylamino)ethyl methacrylate (DMAEMA) was block copolymerised in turn with three other tertiary amine methacrylate comonomers using group transfer polymerisation; the DMAEMA residues of each of these diblock copolymers wereselectively betainised using propane-1,3-sultone under mild conditions to yield a series…
New intercalated compounds have been prepared by incorporating carboxymethyl-β-cyclodextrin (CMCD) into magnesium–aluminum layered double hydroxide (Mg/Al LDH). The sorptive uptake of CMCD(3) and CMCD(14), with a degree of carboxymethyl substitution of 3 and 14, respectively, by Mg/Al LDH was examined at 65 °C, and th…
Metal-free phthalocyanine derivatives 2 and 14 bearing eight and four peripheral tetrathiafulvalene (TTF) units, respectively, have been synthesised, and their solution electrochemistry and optical spectroscopy have been studied. The compounds display redox properties arising from the TTF and from the phthalocyanine g…
Extremely highly mesoporous activated carbon fibers (see Figure) have been synthesized for the first time from pitch fibers containing rare earth metal complexes. These fibers have potential applications in the purification of drinking water, for example, owing to their ability to absorb giant molecules such as humic…
High spin polymers have been created from p-doping of networked polyaryl and polyarylamine polymers which were synthesized using the Pd0 mediated coupling reaction of aryl di- and tri-bromides with aryl bis- and tris-boronic acids. The doping procedures produce polyradical polycations in which (in the limit of 100% do…
Flocculation of colloidal silica with aluminum fractal polymers was investigated by 27 Al magic angle spinning and 29 Si cross polarization magic angle spinning NMR as a function of aluminum concentration and pH. Aluminum flocculant species were prepared by dilution of a commercially available flocculant, WAC HB, the…
Spherical equally sized mixed copper−zinc basic carbonates and Zn-doped tenorite particles have been prepared by coprecipitation from copper−zinc nitrate solutions that become homogeneously alkaline by the hydrolysis of urea at 363 K. The nature of the synthesized solids depends on the initial zinc to total metal mole…
In this study the properties of DL-lactide (DL-LA) copolymers with 5, 10, 15, 20, and 30 wt % (in feed) of epsilon-caprolactone (epsilon-CL) polymerized with stannous(II)octoate (SnOct) as catalyst and glycerol, laurylalcohol, or pentaerythritol as initiator were investigated. Thermal studies showed that the addition…
The complexes [AuI(PPh 3 )] 1, [Au 2 (µ-dppm)Cl 2 ] 2 [dppm = bis(diphenylphosphine)methane], [Au 2 (µ-dppm)I 2 ] 3, [Au 3 (µ-tppm)Cl 3 ] 4 [tppm = tris(diphenylphosphino)methane], [Au 3 (µ-tppm)I 3 ] 5, [Au 3 (µ-dpmp) 2 Cl 2 ]Cl 6 [dpmp = bis(diphenylphosphinomethyl)phenylphosphine] and [Au 3 (µ-dpmp) 2 I 2 ]I 7 were…
Preface. I: Plasma Based Vacuum Deposition Processes to Enhance Wear and Corrosion Performance. II: CVD Processes to Enhance Corrosion and Wear Protection. III: Solid Lubricant Coatings: Their Performance and Applicability at Temperature Extremes. IV: Amorphous Carbon Solid Lubricant Films Deposited by Conventional an…
A co-polymer of O-methyl polyethylene(glycol)-O'-succinate (MPEGs, m.w. 5100) and poly-l-lysine (PL, median m.w. 32700, degree of polymerization 256) has been synthesized by covalent grafting. The resultant MPEGs-PL (30% modification degree of epsilon-amino groups) had a hydrodynamic diameter corresponding to a 690 kD…
Fully integrated microinductors and microtransformers based on two different geometries and ferrite composite materials are designed, fabricated, tested, and compared. These devices are based on screen printed polymer/ferrite composites and electroplated copper coils, and are deposited at low temperature, making them…