Materials Literature
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The origins of an ultrahigh dielectric constant in polycrystalline CaCu3Ti4O12 (CCTO) were studied using the combination of impedance spectroscopy, electron microscopy, and scanning probe microscopy (SPM). Impedance spectra indicate that the transport properties in the 0.1Hz–1MHz frequency range are dominated by a sin…
We propose an equivalent circuit representation of the photogenerated charge separation and propagation in dye sensitized polycrystalline semiconductor in contact with a redox electrolyte. The suggested equivalent circuit for this type of photocell is based on an electrical transmission-line, and uses distributed phot…
Au nanoparticles, prepared by thermal evaporation under high vacuum condition on Si substrate, are irradiated with Au ions at different ion energies. During ion irradiation, embedding of nanoparticles as well as ejection of nano-clusters is observed. Ejected particles (usually smaller than those on the Si substrate) d…
Rheological properties, especially 'shear-thinning', of dense colloidal dispersions are discussed on three different levels. A generalized phenomonological Maxwell model gives a broad framework connecting glassy dynamics to the linear and non-linear rheology of dense amorphous particle solutions. First principles mode…
One lump or two! Selective etching of twinned seeds, mediated by HCl and the oxygen in air, resulted in high yields of perfect single-crystal silver nanocubes in a range of sizes (30–130 nm). The chloride ion enhances oxidation and prevents aggregation, while the proton decreases the rate of reduction and facilitates…
A simple model for solid friction is analyzed. It is based on tangential springs representing interlocked asperities of the surfaces in contact. Each spring is given a maximal strain according to a probability distribution. At their maximal strain the springs break irreversibly. Initially all springs are assumed to ha…
Magnetic domain walls in thin films can be well analyzed using polarized neutron reflectometry. Well defined streaks in the off-specular spin-flip scattering maps are explained by neutron refraction at perpendicular Néel walls. The position of the streaks depends only on the magnetic induction within the domains, wher…
Hexapotassium dihydrogen monotitanoundecatungstocobaltate(II) tridecahydrate, K6H2[TiW11CoO40]·13H2O, crystallizes from aqueous solution in the cubic space group P\overline{4}3m. The structure was refined as an inversion twin. The [TiW11CoO40]8− anion has a Keggin structure with one W-atom site occupied by titaniu…
A tremendous effort has been devoted in the past two decades to the preparation and study of molecule-based materials derived from organometallic or metalorganic species. The work described in this paper is directed to the study of vapor deposited and electrodeposited thin films of these systems. Amorphous thin films…
The organically templated compound (NH 4 ) 3 (4,4′-Hbpy)[(V IV O) 6 ( μ 4 -O) 2 ( μ 3 -OH) 2 ( μ 3 -SO 3 ) 4 ( μ -SO 3 )]·15/2 H 2 O 1 is the first example of an extended structure in which a polyoxometalate anion, [H 2 V 6 IV S 4 IV O 22 ] 2– , is linked by the pyramidal μ 2 -bridging sulfite group forming a linear p…
The structure of amorphous Ge 15 Te 85 has been studied by neutron and x-ray diffraction. Experimental data have been modelled simultaneously with the reverse Monte Carlo simulation method. The contrast between structure factors together with the application of some plausible physical constraints allowed the separatio…
The three-dimensional structures of NAD-dependent D-lactate dehydrogenase (D-LDH) and formate dehydrogenase (FDH), which resemble each other, imply that the two enzymes commonly employ certain main chain atoms, which are located on corresponding loop structures in the active sites of the two enzymes, for their respect…
Dielectric susceptibility spectra of liquids cooled towards the liquid–glass transition often exhibit secondary structure in the frequency region between the α peak and the susceptibility minimum, in the form of either an ‘excess wing’ or a secondary peak—the Johari–Goldstein β peak. Recently, Götze and Sperl (2004 Ph…
Characterization of mesoporous thin films and its implication in applications are presented in this report. It was found that optical, electrical and mechanical properties of mesoporous thin films prepared through surfactant templating are dependent on the film thickness, porosity, pore size and pore structure. A good…
We investigate the localization of a hydrophobic-polar regular copolymer at a selective solvent-solvent interface with emphasis on the impact of block length M on the copolymer behavior. The considerations are based on simple scaling arguments and use the mapping of the problem onto a homopolymer adsorption problem. T…
In this work, polypyrrole (PPy) films were electrodeposited on electrochemically roughened gold substrates modified by argon plasma treatment. First, a gold substrate was roughened by a triangular-wave oxidation-reduction cycle (ORC) in an aqueous solution containing 0.1 N HCl. Then the roughened gold substrate was fu…
L'histoire, les diverses catégories et les caractéristiques et avantages de la catalyse dendritique sont résumés à l'aide de quelques exemples récents tirés des travaux de notre laboratoire. En particulier, les études des divers effets dendritiques nous conduisent à la conclusion selon laquelle les métalloétoiles ou m…
The development of a new in situ probe of metallic character in supported metal clusters utilizing X-ray absorption spectroscopy is described. The technique is based on the extent of screening of the core-hole left in the neutral final state after the X-ray absorption. The technique allows for the clear differentiatio…
The synthesis of protein-based polymers with controlled conformational properties and functional group placement offers many opportunities for the design of advanced materials. In this work, protein engineering methods have been used to produce repetitive alanine-rich protein polymers with the sequence [(AAAQ)(5)(AAAE…
Sr(2)CeO(4) and Sr(2)CeO(4):Eu(3+),Dy(3+) phosphor particles and thin films were prepared by using an emulsion liquid membrane (ELM, water-in-oil-in-water (W/O/W) emulsion) system, containing VA-10 (2-methyl-2-ethylheptanoic acid) as extractant (cation carrier). A two-step extraction enabled efficient extraction for S…