Materials Literature
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Brownian motion of an array of harmonically coupled particles subject to a periodic substrate potential and driven by an external bias is investigated. In the linear response limit (small bias), the coupling between particles may enhance the diffusion process, depending on the competition between the harmonic chain an…
This review concerns the synthesis, characterization, and applications of porous manganese oxides during the last two years. The synthesis of porous tunnel structures, layered structures, and related materials is discussed. Both microporous and mesoporous systems materials are covered here. Characterization discussed…
Stereospecific 1 H and 13 C resonance assignments of hexadienoyl-CoA and crotonyl-CoA have been determined. The two diastereotopic methyl groups at the C2‘‘ carbon were assigned via transferred nuclear Overhauser effect experiments on the complex of hexadienoyl-CoA with the enzyme enoyl-CoA hydratase. The two diastere…
Site-directed mutagenesis was utilized to construct mutants, containing one or two tryptophan residues, of the bifunctional enzyme fructose 6-phosphate,2-kinase-fructose 2,6-bisphosphatase. Two of the single-tryptophan mutants (W15 and W64) had the tryptophan residue located in the kinase domain, which is in the N-ter…
We have discovered a novel procedure that yields extremely stable ruthenium-modified indium−hexacyanoferrate(II/III) film electrodes. The process includes electrochemical deposition of the indium(III)−hexacyanoferrate (InHCF) film and its subsequent voltammetric conditioning in 1 mM RuCl 3 . The resulting inorganic fi…
Phase separation of polystyrene derivatives (PSS) and poly(vinyl methyl ether) (PVME) mixtures was induced in the one-phase region by using photoisomerization of trans -stilbene moieties labeled on the PSS chains. The phase separation was monitored by phase-contrast optical microscopy and was analyzed using digital im…
Matrix-assisted laser desorption/ionization (MALDI)-time-of-flight (TOF) mass spectrometry allowed direct determination of the extent of macrocycle formation that occurred during the polymerization and copolymerization of A 2 B and A 4 B monomers. Cyclization in hyperbranched pentafluorophenyl-terminated poly(benzyl e…
The typical island distance $\ell$ in submonlayer epitaxial growth depends on the growth conditions via an exponent $γ$. This exponent is known to depend on the substrate dimensionality, the dimension of the islands, and the size $i^*$ of the critical nucleus for island formation. In this paper we study the dependence…
The three-dimensional coordination polymers [{( n -C 4 H 9 ) 3 Sn} 3 M(CN) 6 ] (M = Fe, Co) were synthesized by slow interdiffusion of aqueous solutions of K 3 [M(CN) 6 ] and THF solutions of (C 4 H 9 ) 3 SnCl. The structures were determined by single-crystal X-ray crystallography (M = Fe, cubic, P 4 1 32, a = 17.338(…
Highly ordered macroporous materials with uniform pore size of the micrometer scale are known to have important technological uses such as photonic band-gaps and optical stop-bands. However, they can only be produced through adequate treatment of ordered monodisperse macroemulsions. Here, we report how a small amount…
A synthetic strategy has been developed for preparation of NLO chromophores with all the π-conjugated methine groups incorporated into plane-rigidified, fused, six-membered rings. The comparison of the rigidified chromophores to the analogous nonrigid chromophores shows that the configuration-locking methods provide a…
The molecular deformation of ultrahigh-molecular-weight polyethylene monofilaments was monitored in real time by remote laser Raman microscopy (ReRaM). A shift to lower wavenumbers of the symmetric and asymmetric C−C stretching mode bands, was observed in agreement with previously published data. The stress or strain…
Aquabis(3-butenoato)calcium, Ca(C 4 H 5 O 2 ) 2 (H 2 O) ( 1 ), the monomeric precursor for a new solid-state polymerization reaction, was synthesized from 3-butenoic acid and calcium carbonate. Irradiation of solid 1 with 60 Co γ-rays (305 kGy dose) leads to high molecular weight calcium poly(3-butenoate), M̄ w = 400…
Silver(I) complexes of [9]aneS 3, [15]aneS 5, and [18]aneS 6 have been used as templates for the self-assembly of polyiodide ions. The complexes [Ag 2 ([15]aneS 5 ) 2 ]I 12, [Ag([18]aneS 6 )]I 7, [Ag([18]aneS 6 )]I 3, and [Ag([9]aneS 3 ) 2 ]I 5 have been synthesized and structurally characterized. In [Ag 2 ([15]aneS 5…
Two kinds of 1:1 manganese complexes a and b of bis(hexafluoroacetylacetonato)manganese(II) coordinated with diazodi(4-pyridyl)methane ( 1 ) were prepared. Complexes a and b crystallize in the orthorhombic space group Pbca and in monoclinic C 2/ c, respectively. Two pyridyl nitrogen atoms from two different molecules…
Using pulsed laser deposition (PLD), metastable perovskite YMnO3 films were grown from a hexagonal YMnO3 target. The stabilization of the metastable phase is a result of the structural similarity between it and the perovskite substrates. X-ray and electron diffraction confirm the films' epitaxial nature but evince tha…
We employ effective mass theory for degenerate hole-bands to calculate the acceptor binding energies for Be, Mg, Zn, Ca, C and Si substitutional acceptors in GaN and AlN. The calculations are performed through the 6$\times $6 Rashba-Sheka-Pikus and the Luttinger-Kohn matrix Hamiltonians for wurtzite (WZ) and zincblend…
The surface modes of a composite consisting of aligned metallic wires with square cross sections are investigated, on the basis of photonic band structure calculations. The effective long-wavelength dielectric response function is computed, as a function of the filling fraction. The dependence of the optical absorptio…
The Zeeman splitting of the donor spectra in cubic- and hexagonal-GaN are studied using an effective mass theory approach. Soft-core pseudopotentials were used to describe the chemical shift of the different substitutional dopants. The donor ground states calculated range from 29.5 to 33.7 meV, with typically 1 meV hi…
ZnO nanoparticles of about 30−60 Å size in ethanolic solution were etched by addition of anhydrous acetic acid. Upon dissolution, the volume-weighted particle size decreased by about 10%. The polydispersity increased slightly. The dissolution rate was strongly dependent on particle size, and size selective etching of…