Materials Literature
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Filled doughnuts: Molybdenum crown cluster MC accommodates up to three molecules of aminophenyl-substituted metalloporphyrins through hydrogen-bonding interactions, to form discrete inorganic–organic nanocomposite materials (see picture; blue polyhedra=MC, space-filling model=metalloporphyrin). Ultrahigh-vacuum scanni…
The high magnetic field electronic state of the quasi-two-dimensional organic superconductor,$\ensuremath{\kappa}\text{\ensuremath{-}}{(\mathrm{BETS})}_{2}\mathrm{Fe}{\mathrm{Br}}_{4}$ was investigated by the resistance measurements. At very low temperatures, magnetic-field-induced superconductivity (FISC) was observe…
CO2 gas was used to construct novel types of supramolecular polymers. Self-assembling nanostructures 11 and 13 were prepared, which employ both hydrogen bonding and dynamic, thermally reversible carbamate bonds. As precursors, calixarene ureas 1 and 2 were synthesized, which strongly aggregate/dimerize (K(D)>/=10(6) M…
Strengthening of carbon nanotube/epoxy resin composites was achieved by adding a small amount of copolymer (0.03 wt% of epoxy resin) as a dispersant. Tensile testing was used to measure mechanical properties. Young's modulus and fracture stress of the carbon nanotube composites with the copolymer were found to be abou…
Abstract Electrically conductive polyaniline (PANi)/poly(methyl methacrylate) (PMMA) coaxial fibers were prepared through the chemical deposition of PANi onto preformed PMMA fibers via in situ polymerization. PMMA fibers were prepared as core materials via electrospinning. Spectral studies and scanning electron micros…
Aluminum complexes bearing dianionic amine bis(phenolate) ligand are described. Reactions of ligand precursors H 2 O 2 NMe or H 2 O 2 NPr [H 2 O 2 NMe = (CH 3 )N-(CH 2 -2-HO-3,5-C 6 H 2 ( t Bu) 2 ) 2; H 2 O 2 NPr = (CH 3 CH 2 CH 2 )N-(CH 2 -2-HO-3,5-C 6 H 2 ( t Bu) 2 ) 2 ] with 1.1 mol equiv of AlMe 3 in toluene affor…
The effects of different kinds and amounts of fillers, e.g., carbon black N220 and silica−silane, on molecular structure and dynamics of styrene−butadiene rubber (SBR) and the effects of vulcanization on filled SBR systems are studied by Hahn echo and rotating-frame longitudinal relaxation T 1 ρ NMR techniques as well…
Hesperidin is a biologically effective flavonoid. Several studies have reported that dietary hesperidin was converted to conjugated metabolites, such as hesperetin-glucuronides and sulfoglucuronides, during absorption and metabolism. However, the chemical structures of the conjugated metabolites, especially the sites…
The adsorption properties of different ordered mesoporous materials, for the removal of volatile organic compounds (VOCs) in air, have been studied by means of a thermal programmed desorption technique. Toluene, isopentane, and water have been used as adsorbates, whereas a variety of mesostructured materials (MCM-41,…
We present a numerical study of sidebranching of a solidifying dendrite by means of a phase--field model. Special attention is paid to the regions far from the tip of the dendrite, where linear theories are no longer valid. Two regions have been distinguished outside the linear region: a first one in which sidebranchi…
In the present work, the adsorption of human serum albumin (HSA) on commercially pure titanium with a titanium oxide layer formed in a H(2)O(2) solution (TiO(2) cp) and on TiO(2) sputtered on Si (TiO(2) sp) was analyzed. Adsorption isotherms, kinetic studies, and work of adhesion determinations were carried out. HSA e…
We have performed terahertz time-domain spectroscopy of carrier-doped nanoporous crystal 12CaO7Al2O3 showing the Mott variable range hopping at room temperature. The real part of the dielectric constant clearly demonstrates the nature of localized carriers. The frequency dependence of both the real and imaginary parts…
To prepare composite films from biopolymers with anti-listerial activity and moisture barrier properties, the antimicrobial efficiency of chitosan-hydroxy propyl methyl cellulose (HPMC) films, chitosan-HPMC films associated with lipid, and chitosan-HPMC films chemically modified by cross-linking were evaluated. In add…
We study Mode I crack propagation in amorphous material via a molecular dynamics simulation of a binary alloy with pairwise central-force interactions. We find that when the system is subjected to constant displacement after introduction of a seed crack, the crack does not propagate. This was found to be true both for…
A home made DSP-controlled scanning probe microscope (SPM) system has been developed and its utilization as a tool for lithography on nanometer scale is reported. User-friendly graphic interface allows to directly perform nanolithography importing a bitmap pattern on previously-imaged sample region, otherwise moving i…
The effects of high concentration of point defects in crystalline $\mathrm{Zr}\mathrm{Si}{\mathrm{O}}_{4}$ as originated by exposure to radiation, have been simulated using first principles density functional calculations. Structural relaxation and vibrational studies were performed for a catalog of intrinsic point de…
The dominant mechanism for creating large irreversible strain in atomic crystals is the motion of dislocations, a class of line defects in the crystalline lattice. Here we show that the motion of dislocations can also be observed in strained colloidal crystals, allowing detailed investigation of their topology and pro…
Based on first-principles calculations, we suggest a method for fabricating $p$-type ZnO with group-I elements such as Li and Na. With group-I dopants alone, substitutional acceptors are mostly self-compensated by interstitial donors. In ZnO codoped with H impurities, the formation of compensating interstitials is sev…
The RCSB Protein Data Bank (PDB) has a number of options for deposition of structural data and has developed software tools to facilitate the process. In addition to ADIT and the PDB Validation Suite, a new software application, pdb_extract, has been designed to promote automatic data deposition of structures solved b…
The perovskites and perovskite-related structures exhibit several features of technical as well as fundamental interest. Technically useful properties include oxide-ion conduction with/without electronic conduction, oxidation catalysis, ferroic displacements in classic and relaxor ferroelectrics, half-metallic ferroma…