Materials Literature
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When a crystal grows from its undercooled melt the local density changes, driving a convective flow in the liquid phase. Then, the purely diffusional description of the process ceases to be satisfactory. Moreover, the dynamic pressure associated with the flow field may affect the melting temperature (and the effective…
Protoporphyrin IX Zn(II) has been demonstrated to form metalloporphyrin coatings on peptide nanotubes via hydrogen bonds and produce metalloporphyrin nanotubes. This diacid metalloporphyrin was stabilized on the peptide nanotube surfaces with two types of hydrogen bonds, intermolecular hydrogen bond between the carbox…
The coordinatively saturated hydrido complex RuH(biPSi)(CO) 2 ( 1 ), biPSi = −Si(Me)(CH 2 CH 2 CH 2 PPh 2 ) 2, reacts slowly with either water/piperidine or dioxygen to afford the novel “anchored” siloxo complexes ( 3, L = CO) and ( 6, L = CO), respectively, which undergo carbonyl displacement to yield analogues in wh…
Abstract Poly(amide acid) labeled with perylenetetracarboxydiimide (PEDI) was prepared from 3,3′,4,4′‐biphenyltetracarboxylic dianhydride (BPDA), p ‐phenylenediamine (PDA), and diamino‐PEDI. Poly(amide acid) was then reacted with sodium hydride and various kinds of alkyl iodides for transformation into various poly(am…
Singular behavior of the static dielectric permittivity of n-alkyloxycyanobiphenyls $({\mathrm{C}}_{n}{\mathrm{H}}_{2n+1}\mathrm{O}\ensuremath{-}\mathrm{P}\mathrm{h}\ensuremath{-}\mathrm{P}\mathrm{h}\ensuremath{-}\mathrm{C}\ensuremath{\equiv}N,$ $n=6,$ 7) was studied above and below the nematic clearing point ${(T}_{I…
X-ray absorption fine structure (XAFS) measurements as a function of temperature have been carried out at the Mn K edge for ${\mathrm{La}}_{0.7}{\mathrm{Ca}}_{0.3}{\mathrm{Mn}}_{1\ensuremath{-}x}{\mathrm{Ti}}_{x}{\mathrm{O}}_{3}$ and ${\mathrm{La}}_{0.7}{\mathrm{Ca}}_{0.3}{\mathrm{Mn}}_{1\ensuremath{-}y}{\mathrm{Ga}}_…
Fe(III)- and Mn(III)-meso-tetraarylporphyrin catalysis of H(2)O(2) oxidation of dibenzyl and phenyl-2-chloroethyl sulfides, 1, is investigated in ethanol with the aim of designing catalytic systems for mustard decontamination. The sulfide conversion, the sulfoxide and sulfone yields, the oxygen transfer from H(2)O(2)…
A simple method to obtain in high yields mixed-ligand nickel-dithiolene complexes, which show strong negative solvatochromism and negative first molecular hyperpolarizability, and the use of Raman spectroscopy to establish the extent of electronic delocalisation in these complexes, are reported.
The dopant-host interactions were considered in the ${\mathrm{Eu}}^{3+}$- and ${R}^{3+}$-doped cubic C-type rare-earth oxides ${(R}_{2}{\mathrm{O}}_{3})$ as well as in nondoped ${R}_{3}{\mathrm{Ga}}_{5}{\mathrm{O}}_{12}$ and ${R}^{3+}$-doped yttrium gallium garnets $({\mathrm{Y}}_{3}{\mathrm{Ga}}_{5}{\mathrm{O}}_{12}{…
Abstract Compaction of concrete is physically a collapse of the material porous microstructure. It produces plastic strains in the material and, at the same time, an increase of its bulk modulus. This paper presents two experimental techniques aimed at obtaining the hydrostatic response of concrete and mortar. The fir…
We present electron energy-loss spectroscopy measurements on isolated single-walled carbon nanotubes and their bundles performed in a scanning transmission-electron microscope. Spectra are obtained over a range of impact parameters, from the centers of the samples to several nanometers outside the material. Curve-fitt…
The dc electric-field dependence of dielectric constant in the paraelectrics, ${\mathrm{KTaO}}_{3}$ single crystals, ${\mathrm{CaTiO}}_{3}$ and ${(Ln}_{1/2}{\mathrm{Na}}_{1/2}){\mathrm{TiO}}_{3}$ $(Ln=\mathrm{La}$ and Nd) ceramics is studied at cryogenic temperatures in the dc electric-field range 0--60 kV/cm. The res…
AIMS: The following polymers were developed: polyethylene (PE), a PE and polyethylene oxide (70% PE and 30% PEO; PE + PEO) blend, PE and nisin (PE + nisin), PE, nisin, and EDTA (PE + nisin + EDTA), and PE + PEO with nisin (PE + PEO + nisin). METHODS AND RESULTS: Of the polymers tested, PE and PE + PEO did not exhibit…
In recent years, experimental and computational studies have demonstrated that the dynamics of glass-forming liquids are spatially heterogeneous, exhibiting regions of temporarily enhanced or diminished mobility. Here we present a detailed analysis of dynamical heterogeneity in a simulated "bead-spring" model of a low…
A modeling study of C 60 in nanotubes is presented, with focus on a new approach. We report on the elastic properties, energetics, and certain tribological issues, for C 60 inside ( n, n ) nanotubes, with n ranging from 5 to 10. A new combined molecular dynamics/continuum approach with account of both the nonbonded an…
We calculate the optical conductivity of the CuO double chains of PrBa$_2$Cu$_4$O$_8$ by the mean-field approximation for the coupled two-chain Hubbard model around quarter filling. We show that the $\sim$40 meV peak structure, spectral shape, and small Drude weight observed in experiment are reproduced well by the pr…
Effects of dipole-dipole interactions on the magnetic relaxation have been investigated for three Fe-C nanoparticle samples with volume concentrations of 0.06, 5 and 17 vol%. While both the 5 and 17 vol% samples exhibit collective behavior due to dipolar interactions, only the 17 vol% sample displays critical behavior…
This book chapter reviews the current status of Pulsed Laser Deposition (PLD) for coated conductor applications of YBCO on metallic tapes. Clearly, PLD is one of the most promising techniques - particularly for thick films - and has led to some of the highest critical currents Jc. The reputation of PLD as being an exp…
We report a new approach to simulate amorphous networks of covalently bonded materials that leads to excellent radial distribution functions and realistic atomic arrangements. We apply it to generate the first ab initio structures of nitrogen-doped silicon, a-SiNx, for thirteen values of x from 0 to the nearly stoichi…
Carbon nitride spheres, with diameters ranging from 20 microns to as few as 30 nanometers were prepared by template-directed solid-state or solution reaction of cyanuric chloride or fluoride with lithium nitride. The electron microscopy data on the hollow spheres suggest their multiwalled nanostructure, built by disor…