Materials Literature
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Direct electron transfer of horse heart cytochrome c is measured at a nanocrystalline boron-doped diamond thin-film electrode. A quasi-reversible, diffusion-controlled cyclic voltammetric response is observed for untreated diamond. The peak currents change linearly with the concentration, and importantly, there is no…
Mesoporous silica MCM-41 may be restructured by performing secondary synthesis (i.e., recrystallisation) in which calcined MCM-41 is used as silica source. The influence of a number of factors on the recrystallisation has been investigated. The factors investigated are, (1) the time allowed for hydrothermal recrystall…
We have examined the critical adsorption transition for a nonreversible random walk chain (NRRW) and a self-avoiding walk chain (SAW) at the surface and have identified the critical adsorption point. We then examine the partition coefficient of a NRRW chain and a SAW chain confined in a slit with two adsorbing walls n…
The novel atrane-like six-coordinate (RO)(2)TaL complexes [where R = Me or Et and L = tris(2-oxy-3,5-dimethylbenzyl)amine] containing three six-membered rings have been synthesized and characterized. The R = Me complex is the first group 5 representative of this class of compounds structurally characterized by X-ray m…
Acid hydrolysis of cellulose fibers produces suspensions of colloidal cellulose nanocrystals. At low concentrations these suspensions are isotropic, while at high concentrations the cellulose rods spontaneously organize into a chiral nematic liquid crystal phase. We have studied the effect of adding high molecular wei…
Self-assembly of metallic nanostructures using 2D templates consisting of surfactant systems at the air/water interface is demonstrated (see Figure). The morphology of the resulting nanostructures can be partially controlled by adjusting parameters such as the molecular structure of the surfactant, the chemical proper…
The axial phenol group is protonated and the equatorial phenoxyl group antiferromagnetically coupled to the cupric center in the complex [CuII(LH)(OAc)].+ (see picture), which can be considered as both a structural and functional model of galactose oxidase. This complex reproduces the features of the enzyme chemistry.…
Four long-chain phenyl glucoside amphiphiles possessing a saturated or unsaturated long alkyl chain group as the self-assembling unit of a highly organized molecular architecture were synthesized. Their self-assembling properties were investigated by EF-TEM, SEM, CD, FT-IR, and XRD. Compound 2 possessing one double bo…
During this study different raw materials, activating agents, and preparation variables were used to compare the behavior of carbon materials with different morphologies in methane storage applications. Two different types of carbon materials have been prepared: (i) chemically activated carbons prepared from an anthra…
Supramolecular hydrogels (see Figure for structure) are spontaneously formed by mixing aqueous dispersions of short-“legged” ammonium amphiphiles and fluorescent anions. Energy transfer between donor (naphthalene) and acceptor (anthracene) anions is shown to be more efficient in the hydrogels compared to that in dilut…
A new photochromic amorphous molecular material based on an azobenzene, BFlAB, has been designed and synthesized. BFlAB readily forms an amorphous glass with a glass-transition temperature of 97 °C and exhibits photochromism in the amorphous solid film as well as in solution. The BFlAB amorphous film forms a surface r…
Calcium carbonate single crystal structures (see Figure) have been precipitated in polymer membranes with bicontinuous structures whereby the morphologies are dictated by the polymer membrane. The single crystals exhibit intricate, sponge-like morphologies, demonstrating that synthesis of single crystals with complex…
This article summarizes the history associated with the research targeting the design and synthesis of new classes of magnets, namely, those prepared via conventional synthetic organic chemistry methodologies and where the building blocks of the magnetic materials are comprised of molecules as opposed to atoms and as…
Density-functional electronic structure calculations have been used to investigate the ambient pressure and low-temperature structural and elastic properties of uranium metal. The equilibrium volume and bulk modulus have been calculated within the generalized gradient approximation (GGA). Also, the effect of the relat…
The intermetallic compounds AAl2-xSix, where A = Ca, Sr or Ba, crystallize in the C32 structure, same as the recently discovered MgB2 with a high superconducting transition temperature of 39 K. For x = 1, superconductivity has been observed in AAlSi with A = Ca and Sr, but not with A = Ba. The transition temperatures…
Low-energy deposition of neutral Pd_N clusters (N=2-7 and 13) on a MgO(001) surface F-center (FC) was studied by spin-density-functional molecular dynamics simulations. The incident clusters are steered by an attractive "funnel" created by the FC, resulting in adsorption of the cluster, with one of its atoms bonded at…
We survey recent comprehensive studies of exciton relaxation in the crystals of lead halides. The luminescence and electron-spin-resonance studies have revealed that excitons in lead bromide spontaneously dissociate and both electrons and holes get self-trapped individually. Similar relaxation has been also clarified…
We show that the delivery of fracture work to the tip of an advancing planar crack is strongly reduced by surface phonon emission, leading to forbidden ranges of crack speed. The emission can be interpreted through dispersion of the group velocity, and Rayleigh and Love branches contribute as well as other high freque…
The interaction of vacancy with dislocations in Al is studied using the semidiscrete variational Peierls-Nabarro model with ab initio determined gamma surface. For the first time, we confirm theoretically the so-called vacancy lubrication effect on dislocation motion in Al, a discovery that can settle a long-standing…
Redispersible near-infrared emitting lanthanide-doped nanoparticles are reported. The emission and excitation spectra have been examined and the luminescence lifetimes of these materials have been determined. High quantum yields and lifetimes in the millisecond region were found. It is furthermore demonstrated that th…