Materials Literature
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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…
It is well-known from experimental studies that the oxyallyl-substructure-based squarylium and croconium dyes absorb in the NIR region of the spectrum. Recently, another dye has been reported (J. Am. Chem. Soc. 2003, 125, 348) which contains the same basic chromophore, but the absorption is red-shifted by at least 300…
Control of crystallization processes for organic salts is of importance to the pharmaceutical industry as many active pharmaceutical materials are marketed as salts. In this study, a method for estimating the solubility product of a salt of a weak acid and weak base from measured pH-solubility data is described for th…
ZnSe hollow nanospheres have been hydrothermally synthesized at 140 °C for 24 h starting from the precursor ZnCl 2 (N 2 H 4 ) 2 and Na 2 SeO 3 by using hydrazine hydrate (N 2 H 4 ·H 2 O) as the reducing agent. The sample was characterized by XRD, ICP-AES, FE-SEM, and TEM. The BET surface area of the obtained ZnSe holl…
One-pot self-assembled hybrid films were synthesized by the cohydrolysis of methyltriethoxysilane and tetraethoxysilane and deposited via dip-coating. The films show a high "defect-free" mesophase organization that extends throughout the film thickness and for domains of a micrometer scale, as shown by scanning transm…
In this report, procedures are discussed for the enrichment of single-walled carbon nanotube (SWNT) types by simple filtration of the functionalized SWNTs through silica gel. This separation uses nanotube sidewall functionalization employing two different strategies. In the first approach, a crude mixture of metallic…
A simple method has been developed for accurately measuring the crystallographic orientation of a single crystal boule, employing a conventional four-circle x-ray diffraction arrangement in the rocking curve mode which relaxes the need for precise instrument and/or reference alignment. By acquiring a total of eight ro…
La2O2S:Eu3+ nanocrystals (NCs) with a mean size of 18 nm are prepared by gel thermolysis. The morphology of the particles is hexagonal. The surface Eu3+ ions are first detected by time-resolved spectra in the 5D0 --> 7F1 region. Because the symmetry of the sites occupied by surface Eu3+ ions is lower, the 5D0 --> 7F1(…
Polarized neutron diffraction has been used to determine the spatial distribution of the magnetization in CoS 2 and its temperature dependence. Although the previously reported ground state moment 0.84 μ B is non-integral, the compound has sometimes been classified as a half metallic ferromagnet. The present results s…