Materials Literature
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Two new three-dimensional oxychlorides are reported, Te(4)M(3)O(15).Cl (M = Nb(5+) or Ta(5+)). The isostructural materials were synthesized by chemical transport reactions utilizing TeO(2), M(2)O(5), and MCl(5) (M = Nb(5+) or Ta(5+)) as reagents. The compounds exhibit a three-dimensional cationic tunnel framework, wit…
Hydroquinone was chosen as an electroactive probe to study the β-cyclodextrin (β-CD) modified poly( N -acetylaniline) (PNAANI) electrode. The β-CD modified PNAANI electrode was prepared by electrooxidation of the PNAANI electrode in a β-CD/DMSO solution. The electrochemical properties of the β-CD inclusion complex of…
The role of oil spreading in the process of foam destruction by oil-based antifoams (oils or mixed oil−solid compounds) has been the subject of a long debate in the literature. To clarify some aspects of this problem, we compare the entry barriers of antifoam globules in the presence and in the absence of a prespread…
Molecular dynamics simulations, integral equation theory, and wide-angle X-ray scattering experiments are used to study the structure of a poly(dimethylsiloxane) (PDMS) melt. Two different chain models are employed for the molecular dynamics: a united-atom class I potential and an explicit-atom class II potential. The…
Abstract Small‐angle X‐ray scattering (SAXS), atomic force microscopy (AFM), and other techniques were combined in a study of segmented thermoplastic elastomers (Pebax) containing poly(tetramethylene oxide) soft segments and hard blocks of nylon‐12. AFM was used to provide real‐space resolution of the morphology durin…
Recently, a new set of clusters in which twelve Si atoms encapsulate one transition metal atom were found to be especially stable. Making use of $M{\mathrm{Si}}_{12}$ clusters $(M=\mathrm{N}\mathrm{b},\mathrm{W})$ we carry out a first-principles study of the possibility of synthesizing a crystalline phase using such c…
Temperature-dependent reflection−absorption Fourier transform infrared spectra of poly(methyl methacrylate) (PMMA) thin films were measured. From these spectra, two-dimensional (2D) maps of the first derivative of the absorbance with respect to temperature over the space of wavenumber and temperature were constructed.…
In situ x-ray diffraction and Raman spectroscopy were used to explore the pressure-induced phase transformation of spinel ${\mathrm{Zn}}_{2}{\mathrm{TiO}}_{4}$ to pressures of 52.4 and 81.1 GPa, respectively. Results indicate that spinel ${\mathrm{Zn}}_{2}{\mathrm{TiO}}_{4}$ initially transforms to the orthorhombic $(…
BaMgAl 10 O 17:Eu 2+ phosphor powder was synthesized using a sol−gel process. Doping Er 3+ and Nd 3+ in the phosphor can increase the luminescent intensity of the phosphor in the VUV region. The BaMgAl 10 O 17:Eu 2+ phosphor crystallizes completely when the dried gel is calcined at 1300 °C. The BaMgAl 10 O 17:Eu 2+ ca…
Polystyrene latex particles carrying silanol groups on their surface have been synthesized in emulsion polymerization using 3-(trimethoxysilyl)propyl methacrylate (MPS) as a functional comonomer. We showed that the colloidal stability of the resulting latex suspensions was highly dependent on pH and on the nature of t…
With the surge of research in quantum information, the issue of producing entangled states has gained prominence. Here, we show that judiciously bringing together two systems of strongly interacting electrons with vastly differing ground states-the gapped BCS superconductor and the Luttinger liquid-can result in quant…
Optical excitations in hexagonal nanonetwork materials, for example, Boron-Nitride (BN) sheets and nanotubes, are investigated theoretically. The bonding of BN systems is positively polarized at the B site, and is negatively polarized at the N site. There is a permanent electric dipole moment along the BN bond, whose…
An extremal model for the plasticity of amorphous materials is studied in a simple two-dimensional anti-plane geometry. The steady-state is analyzed through numerical simulations. Long-range spatial and temporal correlations in local slip events are shown to develop, leading to non-trivial and highly anisotropic scali…
The Josephson current in the presence of a precessing spin between various types of superconductors is studied. It is shown that the Josephson current flowing between two spin-singlet pairing superconductors is not modulated by the precession of the spin. When both superconductors have equal-spin-triplet pairing state…
A simple experimentally accessible realization of current rectification by molecules (molecular films) bridging metal electrodes is described. It is based on the spatial asymmetry of the molecule and requires only one resonant conducting molecular level (pi-orbital). The rectification, which is due to asymmetric coupl…
We have investigated a single crystal of CeAgSb2 using low field ac-susceptibility, thermal expansion and magnetostriction measurements in the temperature range 1.5K to 90K. The ac-susceptibility exhibits a sharp peak at 9.7K for both B//c and B perp c due to the magnetic ordering of the Ce moment. The thermal expansi…
In the process of molecular dynamics simulation studies of gold nanowires an interesting structure is discovered. This is a finite double-wall nanowire with a large empty core similar to single-wall and double-wall carbon nanotubes. The structure of the 16-10 gold nanotube is studied at the room temperature. An invest…
The good performance of the GW approximation for band-structure calculations in solids was long taken as a sign that the sum of self-energy diagrams is converged and that all omitted terms are small. However, with modern computational resources it has now become possible to evaluate self-consistency and vertex correct…
We present measurements of the magnetic susceptibility and of the thermal expansion of a ${\mathrm{LaCoO}}_{3}$ single crystal. Both quantities show a strongly anomalous temperature dependence. Our data are consistently described in terms of a spin-state transition of the ${\mathrm{Co}}^{3+}$ ions with increasing temp…
Amorphous B−C−N ceramics were produced by thermolysis of poly(borosesquicarbodiimide) of idealized formula [B 2 (NCN) 3 ] n at 1100 °C in an argon atmosphere. Their structure was investigated by X-ray and neutron diffraction. Wide-angle diffraction showed that the ceramics consist of an amorphous structure with hexago…