Materials Literature
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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…
Control of colloids with gravity, temperature gradients, and electric fields, Matt Sullivan, Kun Zhao, Christopher Harrison, Robert H Austin, Mischa Megens, Andrew Hollingsworth, William B Russel, Zhengdong Cheng, Thomas Mason, P M Chaikin
The tetrapodal pentaamine 2,6-C5H3N[CMe(CH2NH2)2]2 (pyN4, 1) forms a series of octahedral iron(II) complexes of general formula [Fe(L)(1)]Xn with a variety of small-molecule ligands L at the sixth coordination site (L = X = Br, n = 1 (2); L = CO, X = Br, n = 2 (3); L = NO, X = Br, n = 2 (4); L = NO+, X = Br, n = 3 (5)…
Using capillary microscopy, internal coalescence between the internal aqueous compartments in a single water-in-oil-in-water (W 1 /O/W 2 ) double-emulsion globule was investigated. Globules were prepared using either sodium dodecyl sulfate (SDS) (ionic) or Tween 80 (nonionic) as the water-soluble surfactants and Span…
A series of cerium(IV) bis-porphyrinate double-deckers [Ce(bbpp)(2)] (BBPP=5,15-bis(4-butoxyphenyl)porphyrin dianion), [Ce(tmpp)(2)] (TMPP=5,10,15,20-tetrakis(4-methoxyphenyl)porphyrin dianion), [Ce(tfpp)(2)] (TFPP=5,10,15,20-tetrakis(4-fluorophenyl)porphyrin dianion), [Ce(tmcpp)(2)] (TMCPP=5,10,15,20-tetrakis(4-metho…
A series of phenylazozmethine (DPA) dendrimers with a porphyrin core (PnH2) were synthesized by dehydration using TiCl4 from meso-tetrakis(4-aminophenyl)porphyrin and the DPA dendrons. The addition of SnCl2 to a dichloromethane/acetonitrile solution of dendritic cobalt porphyrin resulted in a stepwise spectral change.…
The ground-state properties of a Co3II moiety encapsulated in a polyoxometalate anion were investigated by combining measurements of specific heat, magnetic susceptibility, and low-temperature magnetization with a detailed inelastic neutron scattering (INS) study on a fully deuterated polycrystalline sample of Na12[Co…
Pd-based composite membranes supported on porous stainless steel offer high permeability and good mechanical stability. They represent an appropriate alternative in catalytic membrane reactors. In this study, Pd−Ag/porous stainless steel membranes prepared by electroless plating were used in the oxygen-free methane ar…
To develop a nonmetal catalyst to decompose hydrocarbons, a new zeolite-like Ca 12 Al 10 Si 4 O 35 was prepared by calcining hydrogarnet, Ca 3 Al 2 (SiO 4 ) 0.8 (OH) 8.8, a hydrothermal reaction product from a mixture of CaO, Al 2 O 3 sol, and amorphous SiO 2 . The X-ray diffraction analysis showed the framework of (A…
Five novel heptanuclear trigonal-prismatic polyhedra, Na4[PrNi6(Gly)9(mu 3-OH)3(H2O)6].(ClO4)7 (1), Na2[PrNi6(Gly)8(mu 3-OH)3(mu 2-OH2)-(H2O)6].(ClO4)6.(H2O)2 (2), Na[DyNi6(Gly)7(mu 3-OH)3(mu 2-OH2)2(H2O)6].(ClO4)6.H2O (3), [SmNi6(Gly)6-(mu 3-OH)3Cl3(H2O)6].Cl3.(H2O)9 (4), and [ErNi6(Gly)6(mu 3-OH)3Cl3(H2O)6].Cl3.(H2O…