Materials Literature
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Nanoparticles of iron phosphide have been prepared through a new strategy involving the reductive annealing of nanoparticulate iron phosphate precursors cast onto atomically flat mica surfaces. This route appears to be general for a range of transition metals and pnicogens and avoids the use of highly toxic and pyroph…
The reactions of ground-state boron atoms with CO in solid argon have been reinvestigated. The BCO molecule was formed by codeposition of laser-ablated boron atoms with CO in argon. The ν 1, ν 2, ν 3, 2ν 1, 2ν 3, and ν 1 + ν 3 modes of isotopic BCO molecules have been measured. The linear dicarbonyl, B(CO) 2, and the…
We have prepared solutions of multiwalled carbon nanotubes in Aroclor 1254, a mixture of polychlorinated biphenyls. The solutions are stable at room temperature. Transport measurements were performed using a scanning-tunneling probe on a sample prepared by spin coating the solution on gold substrates. Conductance step…
The structure and formation of particulate silica networks in biopolymer solutions were studied using rheological measurements and diffusing wave spectroscopy (DWS). For samples with different volume fractions of silica, the frequency-dependent viscoelastic moduli can be scaled onto one master curve by shifting the da…
Abstract The effect of sodium dihydrogenphosphate, trisodium pyrophosphate, and sodium aluminocarbonate on the thermal decomposition of rigid polyurethane (PUR) foams, based on diphenylmethane‐4,4‐diisocyanate, diphenyl‐2,2‐propane‐4,4‐dioxyoligo(ethylene oxide), and oxyalkylenated toluene‐2,6‐diamine, blown with pent…
A novel coreduction method was developed to synthesize uniform one-dimensional CoTe and NiTe nanocluster wires. In the synthesis, soluble Na(2)TeO(3) was used to supply a highly reactive Te source and N(2)H(4).H(2)O was used both as reducing agent and as complexing agent. The as-prepared samples were characterized by…
The microscopic theory of the magnetically anisotropic effective pseudo-spin-(1)/(2) Hamiltonian for a pair of Co(2+) ions is reported. In the framework of the second-order perturbation approach, the analytical expressions are found for the components of the tensor of the exchange interaction, g-tensor, and the factor…
We investigate the electronic structure of the fullerenes encapsulated inside carbon nanotubes, the so-called nanopeapods, using the first-principles study. The orbital hybridization of LUMO+1 (the state above the lowest unoccupied molecular orbital) of C60, rather than LUMO as previously proposed, with the nanotube s…
Single-walled carbon nanotubes (SWNTs) were irradiated with 1 MeV protons and the samples were analyzed using Fourier transform infrared spectroscopy, UV−vis−NIR spectroscopy, Raman spectroscopy, and secondary ion mass spectrometry. There is clear evidence that the irradiated sample contains C−H bonds.
One-dimensional lanthanide-transition heterometallic chains of squares, [LnNi(2)L(3)(HL)(DMF)(4)(ClO(4))(4).S]( infinity ) (Ln = Gd and Tb; HL is the Schiff base obtained by the condensation of 2-pyridylaldehyde with isonicotinic hydrazide N-oxide; S = solvent) and [LnNi(2)L(4)(DMF)(4)(ClO(4))(3).S]( infinity ) (Ln =…
The cross-linking behavior of mussel adhesive protein Mefp-1 was studied by measuring the rate of aggregation of the protein by photon correlation spectroscopy. To be able to calculate the aggregation numbers, the hydrodynamic radius of monomer Mefp-1 (10 nm) was determined under reducing conditions. The aggregation i…
It is not easy to understand how the electron microscopes and electron microscope techniques that we know today developed from the primitive ideas of the first microscopists of the 1930s. Newcomers to the subject in particular, their time almost fully occupied with grasping practical methods and modern computing techn…
The layer-by-layer (LBL) adsorption of polyelectrolytes onto charged surfaces from aqueous solutions produces multilayered surface structures. A multilayer film of polydiallyldimethylammonium chloride (PDDA) and polystyrenesulfonic acid, sodium salt (PSS), prepared using 1.0 M NaCl in the polymer solutions, has a verm…
Resonance Raman studies on single wall carbon nanotubes (SWNTs) show that resonance with cross polarized light, i.e., with the E(mu,mu+/-1) van Hove singularities in the joint density of states needs to be taken into account when analyzing the Raman and optical absorption spectra from isolated SWNTs. This study is per…
The spin state of a series of cyanide-bridged iron(II) spin-crossover coordination polymers of formula Fe(pyrazine)[M(CN) 4 ]·2H 2 O (M = Ni, Pd, or Pt) have been studied by recording their solid-state Raman spectra at room temperature as a function of pressure. For the first time, a reproducible piezo-hysteresis loop…
We report herein a simple method to prepare subnanometer-sized gold clusters by the reactions between hydrogen tetrachloroaurate (HAuCl4) and meso-2,3-dimercaptosuccinic acid (DMSA; HO2CCH(SH)CH(SH)CO2H) in water. It is demonstrated that DMSA molecules efficiently reduce the Au(III) species and stabilize the resultant…
We present x-ray reflectivity and diffuse scattering measurements from the liquid surface of pure potassium. They strongly suggest the existence of atomic layering at the free surface of a pure liquid metal with low surface tension. Prior to this study, layering was observed only for metals like Ga, In, and Hg, the su…
Local-spin-density-functional (LSDA) calculations may be affected by severe errors when applied to the study of magnetic and strongly correlated materials. Some of these faults can be traced back to the presence of the spurious self-interaction in the density functional. Since the application of a fully self-consisten…
Water-soluble multi-hydroxyl lanthanoid (La, Ce, Gd, Dy, and Er) endohedral metallofullerenes (metallofullerenols, M@C(82)(OH)(n)()) have been synthesized and characterized for the use of magnetic resonance imaging (MRI) contrast agents. The observed longitudinal and transverse relaxivities for water protons, r(1) and…
A detailed modeling of recently observed nonexponential fluorescence intermittency in colloidal semiconductor quantum dots (QDs) is presented. In particular, experiments have shown that both ``on''-time and ``off''-time probability densities generated from single-QD fluorescence trajectories follow an inverse power la…