Materials Literature
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The fundamental magnetic interactions of Pr$_{2}$Fe$_{17}$ are studied by inelastic neutron scattering and anisotropy field measurements. Data analysis confirms the presence of three magnetically inequivalent sites, and reveals an exceptionally large value of the exchange field. The unexpected importance of $J$-mixing…
Spontaneous formation of grains has been observed for the MnAs layer grown by means of MBE on the GaN(0001)-(1x1) surface. Electronic structure of the system was investigated in situ by resonant photoemission spectroscopy. Density of the valence band states of MnAs and its changes due to increase of the layer thicknes…
High-quality epitaxial thin films of EuTiO3 have been grown on the (001) surface of SrTiO3 using pulsed laser deposition. In situ x-ray reflectivity measurements reveal that the growth is two dimensional and enable real-time monitoring of the film thickness and roughness during growth. The film thickness, surface mosa…
Contrary to the conventional wisdom that there is only one unique liquid state for any material, recent evidence suggests that there can be more than two liquid states even for a single-component substance. The transition between these liquid states is called a liquid-liquid phase transition. We report the detailed ex…
Abstract Alumina/poly(methyl methacrylate) (PMMA) nanocomposites were synthesized by an in situ free‐radical polymerization process with 38 and 17 nm diameter γ‐alumina nanoparticles. At extremely low filler weight fractions (<1.0 wt % of 38 nm fillers or < 0.5 wt % of 17 nm fillers) the glass‐transition tempera…
The translocation of single-walled carbon nanotubes (SWNTs) across MCF7 breast cancer cells was demonstrated with radioisotope labeling. Hybrids of SWNT−RNA polymer poly(rU) were formed through a nonspecific binding mechanism which could allow for the dissociation of the poly(rU) from the SWNTs upon delivery. The cell…
Electrogenerated chemiluminescence (ECL) of semiconductor quantum dots in aqueous solutions and its first sensing application were studied by depositing CdSe nanocrystals (NCs) on a paraffin-impregnated graphite electrode (PIGE). The CdSe nanocrystal thin film exhibited two ECL peaks at -1.20 (ECL-1) and -1.50 V (ECL-…
First principles electronic structure simulations are used to study the atomistic detail of the interaction between organic surfactant molecules and the surfaces of CdSe semiconductor nanoparticles. These calculations provide insights into the relaxed atomic geometry of organics bound to semiconductor surfaces at the…
Expressions for the “quantum capacitance” are derived, and regimes are discussed in which this concept may be useful in modeling electronic devices. The degree of quantization is discussed for one- and two-dimensional systems, and it is found that two-dimensional (2D) metals and one-dimensional (1D) metallic carbon na…
Dendronized linear polymers are prepared from dendritic azides and poly(vinylacetylene) using "click chemistry." The Cu(I)-catalyzed Huisgen [2 + 3] cycloaddition is quantitative up to the third generation.
We demonstrate that graphite phonon dispersions have two Kohn anomalies at the $\ensuremath{\Gamma}\mathrm{\text{\ensuremath{-}}}{E}_{2g}$ and $\mathbf{K}\mathrm{\text{\ensuremath{-}}}{A}_{1}^{\ensuremath{'}}$ modes. The anomalies are revealed by two sharp kinks. By an exact analytic derivation, we show that the slope…
Thermal diffusivity has been investigated in ordered double perovskite Sr 2 FeMoO 6 by means of transient surface grating technique in the temperature range of 300–450 K. The thermal diffusivity shows an appreciable decrease from 39 mm 2 /s at 300 K to 37 mm 2 /s at 360 K in the ferromagnetic phase, and then steeply d…
Monte Carlo molecular simulations of the hydration of K-saturated Wyoming-type montmorillonite at constant stress in the NPzzT ensemble and at constant chemical potential in the grand canonical muVT ensemble, under basin-like conditions of 353 K and 625 bar, show a strong tendency of the K+ ions to adhere to the silox…
We present extensive simulations modeling the casting of multiblock polymer films by evaporation. The domain structure of the resulting film is strongly affected by varying the relative stiffness of the coblocks. The morphology changes from a bicontinuous lamellar phase when both blocks are flexible to a small-scale p…
We perform extensive simulations of a binary mixture Lennard-Jones system subjected to a temperature jump in order to study the time evolution of fluctuations during aging. Analyzing data from 1500 different aging realizations, we calculate distributions of inherent structure energies for different aging times and con…
Abstract The ring‐opening polymerization of L ‐lactide initiated by single‐component rare‐earth tris(4‐ tert ‐butylphenolate)s was conducted. The influences of the rare‐earth elements, solvents, temperature, monomer and initiator concentrations, and reaction time on the polymerization were investigated in detail. No r…
Abstract Polymerization rates were proportional to initial Sn(Oct) 2 concentration at low [Sn(Oct) 2 ] 0 /[PrOH] 0 values, but began to level off at higher values. When [Sn(Oct) 2 ] 0 /[PrOH] 0 was significantly greater than unity, the opposite behavior occurred. Tin(II) alkoxide concentration became limited by the in…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTStar-Shaped Polymer Synthesis by Anionic Polymerization of Propylene Sulfide Based on Trifunctional Initiator Derived from Trifunctional Five-Membered Cyclic DithiocarbonateAkane Suzuki, Daisuke Nagai, Bungo Ochiai, and Takeshi Endo…
Cobalt(II) salts react with H2O2 in the presence of 2 equiv of tetramethylethylenediamine (tmen) to produce a stable sideways bonded mononuclear peroxo complex [Co(tmen)2O2]ClO4 which has been characterized chemically and by a single crystal X-ray determination. This is the first such tetraaminecobalt(III) complex, in…
The synthesis, chemical characterization, and liquid crystalline behavior of two new series of poly(propyleneimine) (DAB) codendrimers are described. Both series were obtained by grafting onto the fourth-generation dendrimer (DAB−(NH 2 ) 32 ) various proportions of two types of promesogenic units: one of them laterall…