Materials Literature
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Solid-state preparation, structure, and multi-colour luminescence of Eu 2+ doped strontium aluminate (SRA) phosphors have been reported in this paper. It has been observed that a slight modification in the processing parameters such as type of reducing atmosphere, stoichiometric excess of one or more constituents, nat…
Effects of mixing of magnetic states in a molecular ${\mathrm{Cr}}_{8}$ ring were investigated by torque magnetometry and heat capacity measurements. Results are interpreted within the framework of the spin Hamiltonian approach allowing us to fit the pattern of energy levels derived by neutron spectroscopy. The torque…
A novel, high-efficiency detector for neutral atoms such as helium is described. The design uses multiwalled carbon nanotubes (MWNTs), grown by chemical vapor deposition on a steel support wire. Application of a positive bias to the MWNTs generates electric fields sufficient to field-ionize passing gas-phase atoms. Un…
Materials for thermoelectric application should have low lattice thermal conductivities. Here we use a comparison of theoretical calculations and Raman spectroscopy to study the lattice dynamics of a La filled skutterudite and identify the Raman active modes. Polarized Raman spectra from polycrystalline ${\mathrm{La}}…
A six-dimensional cluster model of icosahedral Al-Pd-Mn $(i\ensuremath{-}\mathrm{Al}\ensuremath{-}\mathrm{Pd}\ensuremath{-}\mathrm{Mn})$ quasicrystals used in the recent structure refinement is described in detail. This model is based on five kinds of clusters located at vertices, edge centers of the inflated three-di…
A comprehensive analysis of half-doped manganites is presented using Monte Carlo simulations applied to the double-exchange model with cooperative Jahn-Teller lattice distortions in two dimensions. A variety of results are reported. In particular (i) The phase diagram is established in the $\ensuremath{\lambda}\ensure…
The phase behavior of aqueous mixtures of poly(ethylene oxide) (PEO) and dextran is studied as a function of the polymer concentration, the PEO molar mass, and temperature. The molar mass distributions of the two polymers in the coexisting phases are measured. From the temperature dependence we conclude that the phase…
A surface modification technique was developed for the covalent immobilization of heparin onto electrically conductive polypyrrole (PPY) film. The PPY film was first graft copolymerized with poly(ethylene glycol) methacrylate (PEGMA) and then activated with cyanuric chloride (CC). Heparin was then immobilized onto the…
In a series of mono and mixed-alkali borosilicate glasses (∼0.7M 2 O·B 2 O 3 ·2SiO 2, M = Li, Na, K, ( 1 / 2 Li 2 O + ∼ 1 / 2 Na 2 O), ( 1 / 2 Li 2 O + 1 / 2 K 2 O), and (∼ 1 / 2 Na 2 O + 1 / 2 K 2 O)), we have applied triple-quantum magic-angle spinning (3QMAS) and 11 B and 17 O NMR to obtain high-resolution informat…
Polyglycolic acid (PGA) is commonly used as a scaffold for tissue engineering. Recent studies utilized PGA as a scaffold for vascular tissue engineering using bovine and porcine smooth muscle cells (SMCs). In engineered vessels, the SMCs displayed high rates of mitosis and dedifferentiation in areas where PGA fragment…
The paper presents infrared reflectivity and micro-Raman scattering spectra of LiBC powder pellets. The experiment allowed assignment of frequencies of all infrared and Raman active zone center modes. Results are compared with available ab-initio calculations; prediction of large Born effective charges on the nodes of…
We study the effect that the ferromagnetic order has on the electrical properties of diluted magnetic semiconductors. We analyze the temperature dependence of the dielectric constant and of the resistivity of ${\mathrm{Ga}}_{1\ensuremath{-}x}{\mathrm{Mn}}_{x}\mathrm{As}.$ In our treatment the electronic structure of t…
We have investigated the magnetic properties of nanocrystalline ${\mathrm{LaCo}}_{0.5}{\mathrm{Mn}}_{0.5}{\mathrm{O}}_{3}.$ The temperature dependence of the imaginary part of the ac susceptibility shows a strongly frequency-dependent maximum at a temperature ${T}_{f},$ which is well below the ferromagnetic transition…
We propose a means for constructing highly accurate equations of state (EOS) for elemental solids and liquids essentially from first principles, based upon a particular decomposition of the underlying condensed matter Hamiltonian for the nuclei and electrons. We also point out that at low pressures the neglect of anha…
A full range of novel multipod frameworks of Cu 2 O microcrystals has been prepared in solution phase via manipulating synthetic parameters. More importantly, a new organization scheme for three-dimensional crystal aggregates has been elucidated in this work; faceted microcrystal subunits (6, 8, and 12 pieces) with si…
Here we report on the synthesis, physical and chemical properties, and stability of Pd nanoparticles encapsulated within poly(amidoamine) (PAMAM) dendrimers. Specifically, amine- and hydroxyl-terminated PAMAM dendrimers ranging in generation from 4 to 8 were studied. Under appropriate conditions, addition of K 2 PdCl…
Protein folds are built primarily from the packing together of two types of structures: alpha-helices and beta-sheets. Neither structure is rigid, and the flexibility of helices and sheets is often important in determining the final fold ({\it e.g.}, coiled coils and beta-barrels). Recent work has quantified the flexi…
We study the growth of aligned domains in nematic liquid crystals. Results are obtained solving the Beris-Edwards equations of motion using the lattice Boltzmann approach. Spatial anisotropy in the domain growth is shown to be a consequence of the flow induced by the changing order parameter field (backflow). The gene…
Single-molecule fluorescence spectroscopy was used to determine the electronic properties of individual single-walled carbon nanotubes. Carbon nanotube structure was determined simultaneously from Raman spectroscopy. Fluorescence spectra from individual nanotubes with identical structures have different emission energ…
$^{1}\mathrm{H}$ NMR and static susceptibility measurements have been performed in an organic Mott insulator with a nearly isotropic triangular lattice, $\ensuremath{\kappa}\mathrm{\text{\ensuremath{-}}}(\mathrm{B}\mathrm{E}\mathrm{D}\mathrm{T}\mathrm{\text{\ensuremath{-}}}\mathrm{T}\mathrm{T}\mathrm{F}{)}_{2}{\mathrm…