Materials Literature
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Abstract Water-soluble indium phosphide nanocrystals capped with mercaptoacetic acid were synthesized. The nanocrystals fluoresce in the near-infrared region with maximum excitation and emission wavelengths at 750 and 826 nm, respectively. The fluorescence intensity is significantly enhanced in the presence of Hg2+ io…
We describe a simple manipulation of an asymmetric diblock copolymer, polystyrene-b-poly(4-vinylpyridine), mixed with 3-pentadecylphenol that generates a dense network of interconnected nanostrands at the air/water interface. This morphology is obtained by compression of the solution immediately after spreading, contr…
A new series of nitrogen heterocyclic dehydroannulenes 1-3 have been synthesized and their macrocyclic structures assigned using spectroscopic methods. The chiral and planar ground state conformations of 1 and 3, respectively, were determined by semiempirical theoretical calculations. All dehydropyridoannulenes and pr…
A morphological transition from cylinders to spheres was induced in an asymmetric diblock copolymer, poly(styrene)-block-poly(tert-butyl acrylate) (PS-b-PtBA). The periodic arrays of the poly(tert-butyl acrylate) (PtBA) domains were transformed to the ordered poly(acrylic anhydride) (PAA) spheres via the thermal depro…
The growth of hexagonal boron nitride ( h -BN) on a Pt(111) surface by decomposition of B-trichloroborazine (ClBNH) 3 leads to two different sets of domain structures as indicated by low-energy electron diffraction (LEED). In addition to a domain structure, for which the top, hcp, and fcc sites of the substrate lattic…
Co-crystallization of K2[Ru(bipy)(CN)4] with lanthanide(III) salts (Ln = Pr, Nd, Gd, Er, Yb) from aqueous solution affords coordination oligomers and networks in which the [Ru(bipy)(CN)4]2- unit is connected to the lanthanide cation via Ru-CN-Ln bridges. The complexes fall into two structural types: [{Ru(bipy)(CN)4}2{…
The objective of this study was to establish the optimum conditions for preparing stable oil-in-water emulsions containing droplets surrounded by surfactant-chitosan layers. A primary emulsion containing small droplets (d32 approximately = 0.3 microm) was prepared by homogenizing 20 wt% corn oil with 80 wt% emulsifier…
The successful attachment of 2−3 nm gold particles to ∼10 nm Fe 3 O 4 nanocrystals through a simple, two-step chemically controlled procedure is reported. The surface of individual, relatively monodisperse, Fe 3 O 4 nanospheres forming a stable colloidal methanolic solution is coated with an amino-terminated silane, p…
A trinuclear zinc alkoxide [{(BDI-OMe)Zn(μ-OBn)} 2 Zn(μ-OBn) 2 ] ( 1 ) and a homoleptic zinc complex [(BDI-OMe) 2 Zn] ( 2 ) have been prepared by the addition of benzyl alcohol to a mixture of BDI-OMe-H with Et 2 Zn. Compound 1 has been employed as an initiator for ring-opening polymerization of lactides and ε-caprola…
In THz reflection spectroscopy the complex permittivity of an opaque medium is determined on the basis of the amplitude and of the phase of the reflected wave. There is usually a problem of phase error due to misplacement of the reference sample. Such experimental error brings inconsistency between phase and amplitude…
We present and discuss some ideas concerning an ``average-pair-density functional theory'', in which the ground-state energy of a many-electron system is rewritten as a functional of the spherically and system-averaged pair density. These ideas are further clarified with simple physical examples. We then show that the…
In this paper we present a detailed theoretical analysis of the cyclotron resonance in metals in the magnetic field directed along a normal to the surface of a sample. We show that this resonance occurs due to local geometry of the Fermi surface of a metal. When the Fermi surface (FS) includes segments where its curva…
Polymer composites containing variable amounts of multiwalled carbon nanotubes (MWNTs) have been prepared using solution dispersion and melt-shear mixing. Various polymer composites with 1 wt % MWNTs have been found to dissolve homogeneously in organic solvents. The amount of polymer coated or wrapped MWNTs dissolved…
Chemical Vapor Transport of Solid Solutions. 20, Chemical Vapor Transport of Mixed Phases in the Systems CdS/CdTe and CdSe/CdTe By means of CVT methods using iodine as transport agent (900 → 800 °C) in the systems CdS/CdTe and CdSe/CdTe mixed crystals could be prepared. The system CdS/CdTe shows a broad miscibility ga…
The local structure around the rubidium ions inserted in single-wall carbon nanotube bundles (Rb-doped SWCNT) is studied by Rb $K$-edge extended x-ray-absorption fine structure (EXAFS). The dependence of the local order around the rubidium ions is investigated as a function of the time of doping (i.e., as a function o…
The structural and magnetic properties of ErFe 12− x Nb x compounds ( x = 0.6, 0.7 and 0.8) have been investigated by x-ray diffraction, ac susceptibility and dc magnetization measurements and 57 Fe Mössbauer spectroscopy. Refinements of the x-ray diffraction patterns show that the Nb atoms preferentially occupy the 8…
Abstract The crystal structures of the room and the high temperature modifications of cesium trifluoromethyl sulfonate were solved from high resolution X‐ray powder diffraction data. At room temperature, α‐CsSO 3 CF 3 crystallizes in the monoclinic space group P 2 1 with lattice parameters a = 9.7406(2) Å, b = 6.1640(…
We investigate the phonon dispersion of graphite within a generalized bond-charge model with emphasis on the microscopic origin of the infrared active mode. The resulting dispersion is in good agreement with experiments, particularly with the full optical spectra obtained by the recent x-ray scattering experiment. The…
Proton uptake in undoped and Y-doped BaPrO3 has been measured by cold neutron prompt-gamma activation analysis, and compared to the proton uptake in Gd-doped BaCeO3, as determined by the same technique. The conventional proton incorporation model of perovskites in which oxygen ion vacancies, generated by the introduct…
The dynamic properties of the cyclic hexanuclear iron(III) complex ${\mathrm{Fe}}_{6}{(\text{triethanolaminate}\phantom{\rule{0.3em}{0ex}}3\text{\ensuremath{-}})}_{6}$ are studied by electron spin (ESR) and $^{1}\mathrm{H}$ nuclear magnetic resonance. We analyze the angular and temperature dependence of the ESR absorp…