Materials Literature
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We present three theoretical models of various degree of completeness to explore the chemical phase space available to the Glu4His2Zn2 cofactor found in the four-helix bundle of de novo designed metalloprotein Duo Ferro 1. We have found that the planewave DFT geometry optimization of 94-atom Model I, which contains bo…
We study glass formation in hard spheres with short-range attraction. The system consists of nearly-hard-sphere polymethylmethacrylate particles and non-adsorbing random-coil polystyrene which induced a depletion attraction between the particles. The experiments reveal a re-entrant glass transition and two qualitative…
The orientational properties of liquid crystals in twisted nematic (TN) and supertwisted nematic (STN) cells were studied by Monte Carlo (MC) simulation depending on the strength of an external field. The liquid crystals sandwiched between planar surfaces were described by three-dimensional lattice systems of dimensio…
Infrared spectra of CO alone and CO followed by the introduction of 2-butenal (crotonaldehyde) have been recorded for Pt/CeO2–SiO2 and Zn doped Pt/CeO2–SiO2 catalysts which had been pre-reduced at 473, 623 and 773 K. Samples treated at the highest reduction temperature showed the greatest selectivity toward the unsatu…
Lanthanide complexes of 1,10-phenanthroline (phen), 2,2′-bipyridine (bipyridyl, bpy) and dipicolinate (dpa), together with uncomplexed lanthanide ions (Ln = Nd, Sm, Dy, Ho, Er) were doped into silica–polyethylene glycol (SiO2–PEG) inorganic–organic hybrid materials. The samples were prepared via a sol–gel process. The…
Abstract Several H‐zeolites (H‐Y, H‐ZSM‐5 and H‐MOR) were investigated for the catalytic combustion of chlorinated ethylenes, namely 1,1‐dichloroethylene and trichloroethylene. Conversion was inversely related to the chlorine content of the feed molecule. H‐ZSM‐5 zeolite was the most active catalyst in 1,1‐dichloroeth…
We calculate the depletion potential between two hard spheres of radii R s and that between one hard sphere and a planar hard wall in a sea of hard rigid spherocylindrical rods of length L and radius R r . Unlike earlier studies our approach takes into account the true geometry of the problem and gives, to first order…
At low ionic strength the interaction between any two charged colloids in a concentrated charge-stabilized suspension is strongly influenced by the charge distributions of other colloids in the neighbourhood of the two interacting colloids. When such many-body interactions become important, a colloidal suspension can…
We report measurements on gas–liquid phase-separating colloid–polymer mixtures. A horizontally placed optical microscope with long-working-distance objectives enables us to see effects of gravity on phase separation kinetics and hence see the complete phase separation from beginning to end. Furthermore, the static pro…
The controlled assembly in solution of gold nanocrystals modified by attachment of complementary protein−DNA conjugates is described. The size of the aggregates formed can be controlled by the addition of single-stranded DNA, which quickly terminates the assembly process. The rate of formation of the aggregates can al…
The role of hydrogen in the direct nitridation of silicon was studied in conjunction with the role of oxygen contained in both the gas and solid phases at temperatures ranging from 1150 to 1350 °C in nitrogen containing hydrogen from 0 to 10 vol %. Hydrogen prevented a protective layer, being composed of silicon dioxi…
We report the results of an electron spin resonance study of Ti 3+ centres in SrTiO 3 single crystals. The Ti 3+ centres are created in perturbed regular Ti 4+ sites by trapping a photoelectron from the conduction band after ultraviolet irradiation of the sample at low temperature ( T < 180 K). The centres are stable…
We review the novel features of the Stokes drag of a spherical particle dispersed in a nematic solvent. It is anisotropic, couples to rotations of the particle, and exhibits strong non-linearities.
The formation of chromate conversion coatings on zinc was studied by chronopotentiometric, electrochemical, and electrohydrodynamic impedances, and interfacial pH measurements. The electrochemical experiments were performed with a rotating disk electrode of pure zinc, and the pH measurements were obtained with a zinc…
Oxyfluoride glasses were developed in the 30SiO 2 · 15AlO 1.5 · 28PbF 2 · 22CdF 2 · (4.8 − y )GdF 3 · 0.1NdF 3 · yYbF 3 · 0.1TmF 3 ( y = 0, 0.1, 0.2, 0.5, 1, 2, 3, 4 and 4.8) composition, in mol%. X-ray diffraction analysis revealed that heat treatments of the oxyfluoride glasses cause the precipitation of (Nd 3+ , Yb…
The main problem in power transformers is the degradation of the isolation, and partial discharges are a major contribution to this shortcoming. Partial discharges inside medium-and high-power transformers generate ultrasonic pressure waves which are usually detected by using acoustic piezoelectric sensors placed outs…
Polyelectrolyte multilayers which are built up by alternating adsorption of polyanions and polycations from aqueous solutions at a solid interface are investigated by reflectometry and ellipsometry. Below a degree of charge of about 70% the adsorption stops after a certain number of dipping cycles and no multilayer fo…
A sensitive method for the configurational analysis of (R)- and (S)-[2H1]-fluoroacetate has been developed using 2H[1H]-NMR in a chiral liquid crystalline solvent. This has enabled biosynthetic experiments to be conducted which reveal stereochemical details on biological fluorination occurring during the biosynthesis…
Metal foams are prepared by mixing a metal powder and a gas-releasing blowing agent, by densifying the mix to a dense precursor and finally foaming by melting the powder compact. The foaming process of aluminium foams is monitored in situ by x-ray radioscopy. One observes that foam evolution is accompanied by film rup…
Abstract A series of experiments were conducted to investigate the effect of activation temperature on pore development of activated carbon produced from palm shell. Activation of the samples was carried out at 800, 850 and 900 °C for different durations ranging from 10 to 180 min. The samples were characterized using…