Materials Literature
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A blue luminescent tetradecavanadate compound, [Et4N]5[V14O36Cl], has been synthesized. It possesses an unprecedented half-open basket framework. Through the {ABAB}-type stacking, the {V14O36} clusters form infinite one-dimensional channels with considerable accessible volume in the crystalline state.
We study the phase behavior of diblock copolymers in the presence of an external electric field. We employ self-consistent-field theory and treat the relevant Maxwell equation as an additional self-consistent equation. Because we do not treat the electric field perturbatively, we can examine its effects even when its…
The asymptotic staying probability $P$ in the Landau-Zener effect with interaction is analytically investigated at fast sweep $\ensuremath{\epsilon}=\ensuremath{\pi}{\ensuremath{\Delta}}^{2}∕(2\ensuremath{\hbar}v)⪡1$. We have rigorously calculated the value of ${I}_{0}$ in the expansion $P\ensuremath{\cong}1\ensuremat…
Recently reported structural complexity and superconducting transition in lithium under pressure has increased the interest in light alkalis, otherwise considered as simple metals and well known systems under normal conditions. In this work we present an analysis of the pressure induced Fermi surface deformation in li…
Functionally designed elastomeric nanofiber fabrics made of the equimolar copolyester, poly(L-lactide-co-epsilon-caprolactone) (PLCL), with type I collagen or the tri-n-butylamine salt of heparin (heparin-TBA) were co-electrospun using 1,1,1,3,3,3-hexafluoro-2-propanol (HFIP) as a solvent. The co-electrospun fabrics (…
We suggest a method for efficient (high-coverage) grafting of organic molecules onto photoluminescent silicon nanoparticles. High coverage grafting was enabled by use of a modified etching process that produces a hydrogen-terminated surface on the nanoparticles with very little residual oxygen and by carefully excludi…
The influence of transition metal oxides additives, especially zinc oxide, on the densification and electrical properties of doped barium zirconate have been examined. With the use of zinc oxide as a sintering aid, BaZr 0.85 Y 0.15 O 3–δ was readily sintered to above 93% of theoretical density at 1300°C. Scanning elec…
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The magnetic properties of tetragonal $\mathrm{Y}{\mathrm{Fe}}_{x}{\mathrm{Mn}}_{12\ensuremath{-}x}$ compounds, which crystallize in the $\mathrm{Th}{\mathrm{Mn}}_{12}$-type structure, are governed by both strong competing exchange interactions between the magnetic moments on three nonequivalent sites $8i$, $8j$, and…
Abstract The studies were focused on evaluation of different scale dissolvers for barite sag or barium sulfate scales, while the chemically similar compound, the strontium sulfate obtained much less attention. Therefore, an extensive research programme was launched with the aim at evaluating the potential of seven dif…
We report theoretical investigations on the changes in optical and electronic properties of single-walled carbon nanotubes (SWNTs) induced by chemical doping with organic molecules or fullerene C60. It is found that doping alters the electronic and optical properties of parent SWNTs and both p- and n-type doping can b…
We studied the relation between the electronic structure and the physical properties of ${\mathrm{Sr}}_{3}\mathrm{Fe}M{\mathrm{O}}_{7}$ ($M=\mathrm{Fe}$, Co). The main technique used in the study was Fe $2p$, Co $2p$, and O $1s$ x-ray-absorption spectroscopy. The experimental spectra were analyzed in terms of cluster…
The atomistic simulation of polycrystalline growth with an empirical potential requires an accurate modeling of the atomic configurations at grain boundaries. We refine an existing embedded-atom potential for bulk titanium to reproduce systems with small atomic coordination, namely, clusters of up to nine atoms, the r…
Strong cooperative interactions occur between four different broken symmetries involving charge ordering and bond distortions in the quarter-filled correlated zigzag electron ladder. The ground state is singlet, with spin gap several times larger than in the spin-Peierls state of the one-dimensional quarter-filled cha…
We have studied the Raman intensities of low-frequency phonon modes in germanium $(\mathrm{Ge})$ nanocrystals (NC) with varying sizes by using a microscopic valence force field model. The results are compared with the predictions of the continuum model of Lamb using a projection method. We found that the $l=0$ spheroi…
Abstract Powders of cobalt core with a nickel (II) oxide shell (CoNiO) have been studied by Electron Spin Resonance (ESR) technique in the temperature range of 10–300 K. A strong and broad (1300 G) single ESR peak in X‐, K‐ and Q‐band spectra has been observed at all the temperature ranges. While the resonance field r…
The behavior of a multilayer material at high strain rate is investigated by a combination of experimental and numerical techniques. It is shown that, although the Split Hopkinson Pressure Bar (SHPB) at first appears unsuitable for such applications, it is a valuable tool to validate finite element modeling. The feasi…
In an attempt to explore the mechanism for the synthesis of silsesquioxanes (POSS), the entire reaction processes from HSi(OH)3 to T8, one of the most common and stable POSS was investigated with electronic structure theory calculations, including electron correlation effects. In addition, the effect of some controlli…
A photoactive supramolecular assembly that is based on the hydrogen-bonded system H1.G2, consisting of a methyl viologen-functionalized barbiturate host (H1) (1-(N-(3,5-bis[[(6-tert-butylacetylamino-2-pyridyl)amino]carbonyl])-phenylacetamide)-1'-methyl-4,4'-bipyridium) and a [Re(Br)(CO)3(barbi-bpy)] (barbi-bpy = 5-[4-…
We describe the design and operation of a spatially-filtered Raman/fluorescence spectrometer that incorporates a pulsed 532nm laser excitation source and a synchronized and electronically gated CCD detector. This system permits the suppression of undesired continuous radiation from various sources by a factor of up to…