Materials Literature
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Abstract An investigation was conducted on the adsorption and desorption of copper(II) from aqueous solutions with a new spherical cellulose adsorbent containing the carboxyl anionic group. Various factors affecting the adsorption were optimized. The adsorption of Cu 2+ ions on the adsorbent was found to be dependent…
Collagens are major structural proteins in the extracellular matrix, making up about one-third of protein mass in higher animals. In addition to their sheer bulk, this protein family is of interest because of their diversity of structural and morphogenetic roles and the attribution of an increasing number of hereditar…
Supramolecular nanoribbons formed by dendron rod–coil molecules show ordered birefringence! The authors describe here how self-assembling block molecules containing dendritic, rodlike, and flexible segments can cause certain monomers to gel into ordered birefringent media. As demonstrated in the Figure even an amorpho…
The low-temperature magnetoresistance of ${\mathrm{La}}_{0.7}{\mathrm{Ca}}_{0.3}{\mathrm{MnO}}_{3}$ (LCMO) thin films has been investigated using a four-probe dc technique with a 5 T superconducting magnet. Thin film samples of LCMO were prepared in situ using a pulsed laser deposition technique. The results obtained…
The crystal structure and spectroscopic properties of the periplasmic penta-heme cytochrome c nitrite reductase (NrfA) of Escherichia coli are presented. The structure is the first for a member of the NrfA subgroup that utilize a soluble penta-heme cytochrome, NrfB, as a redox partner. Comparison to the structures of…
Porous pure and doped silicas with pore sizes at two length scales (meso/macroporous) have been prepared and shaped both as powders and monoliths through a one-pot surfactant assisted procedure by using a simple template agent and starting from atrane complexes as inorganic precursors.
Carboxylate chemistry is used to covalently couple metal nanoparticles to defect sites in controllably oxidized single-walled carbon nanotube termini and side-walls, and this process monitored by atomic force microscopy.
Ab initio total-energy density-functional methods with supercell models have been employed to calculate the c(2x2) structure of the Br-adsorbed Ag(100) and Au(100) surfaces. The atomic geometries of the surfaces and the preferred bonding sites of the bromine have been determined. The bonding character of bromine with…
We have studied crystal structure, magnetism and electric transport properties of a europium fulleride Eu6C60 and its Sr-substituted compounds, Eu6-xSrxC60. They have a bcc structure, which is an isostructure of other M6C60 (M represents an alkali atom or an alkaline earth atom). Magnetic measurements revealed that ma…
Polycrystalline Mg(1-x)Al(x)B(2) (x = 0, 0.1, 0.4, 0.5, 0.6, 1) samples have been prepared by a conventional solid state reaction. The Mg 2p, Al 2p and B 1s core level binding energies have been studied using X-ray photoemission spectroscopy (XPS). It is found that Mg 2p, Al 2p and B 1s core level binding energies inc…
Using exact diagonalization method,we studied the ground state of the anisotropic molecular magnets and find a critical point in the transverse field,which may divide the quantum tunneling region into two different parts. Possible ways to observe and take advantage of this point by varying the transverse field are sug…
Electrochromic devices fabricated by layer- by-layer assembly of europium-containing polyoxometalate clusters, poly(allylamine hydrochloride), and poly(styrenesulfonate) are investigated (see Figure). A high electrochemical contrast, adequate response time, low operation voltage, and low power consumption are reported…
We report scanned probe investigations on the ferroelectric properties of individual single-crystalline barium titanate nanowires. We show that nonvolatile electric polarization can be reproducibly induced and manipulated on these nanowires, thereby demonstrating that nanowires as small as 10 nm in diameter retain fer…
Catalytic sites can be placed at the core, at interior positions or at the periphery of a dendrimer. There are many examples of the use of peripherally functionalized dendrimers in catalysis and this subject has been thoroughly reviewed in the recent literature. This review is concerned only with dendrimer based catal…
1D single-crystalline zinc oxide nanostructures are promising for nanoscale optoelectronic applications. Here a simple chemical vapor deposition method for the growth of well-aligned ZnO nanorods (see Figure) at low temperature is demonstrated. The nanorods, which grow on fused silica and are preferentially oriented i…
Ceramic fibers with the Si-C-O-Al composition were prepared by melt-spinning of polyaluminocarbosilane (PACS), initial curing in air and then thermal curing, before finally being pyrolyzed at 1300 °C. The ceramic fibers so-obtained were sintered at 1800 °C in argon to produce Si-C-Al ceramic fibers as a super high tem…
We compare experimental $\mathrm{O} 1s$ electron energy-loss structures below 30 eV of single crystalline ${\mathrm{SrTiO}}_{3},$ ${\mathrm{BaTiO}}_{3},$ and ${\mathrm{TiO}}_{2}$ with their theoretical electron energy-loss functions. The photoelectron energy-loss structures of in situ fractured surface in ultrahigh va…
Infrared spectra of dimethyl oxalate isolated in low-temperature argon matrix and of the compound in the solid amorphous and crystalline state are reported. The experimental observations are interpreted in terms of a large amplitude, low frequency vibration along the torsional coordinate OC–CO. Assumption of the large…
Field emission from multihead silicon (Si) cones was substantially improved by cesium (Cs) coating. Increasing the Cs coating lowered the emission turn-on field (for 10 μA/cm2) from 25 V/μm to a saturated value of 13 V/μm, while the threshold field (for 10 mA/cm2) decreased by 30%, dropping from 27 V/μm for Si cones c…
The synthesis, characterization and mesomorphic properties of gold(I) and silver(I) ionic isocyanide complexes [Au(CNR)2]Y [R = C6H4OCnH2n + 1, C6H4C6H4OCnH2n + 1, C6H2(3,4,5-OCnH2n + 1)3; Y = PF6−, BF4− (n = 4, 8, 12), Y = NO3− (n = 8)] and [Ag(CNR)2]Y [R = C6H4OCnH2n + 1 (n = 8, 12), C6H4C6H4OCnH2n + 1 (n = 4, 8, 12…