Materials Literature
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The nuclear quadrupole moment of the I=3/2- excited nuclear state of 57Fe at 14.41 keV, important in Mössbauer spectroscopy, is determined from the large-scale nuclear shell-model calculations for 57Fe and also from the electronic ab initio and density functional theory calculations including solid state and electron…
The Mn2+ emission wavelengths are at 591, 588, 581 and 570 nm, respectively, for the ∼10, ∼4.5, ∼3.5 nm sized nanoparticles and the ZnS:Mn nanoparticles formed in an ultrastable zeolite-Y. To reveal the cause for the shift, the crystal field and phonon coupling were investigated. The results show that the predominant…
The contrast mechanisms of domain imaging experiments assisted by atomic force microscope (AFM) have been investigated by model experiments on nonpiezoelectric (silicon oxide) and piezoelectric [Pb(Zr,Ti)O3] thin films. The first step was to identify the electrostatic charge effects between the tip, the cantilever, an…
In this article, domain wall motion and the extrinsic contributions to the dielectric and piezoelectric responses in sol–gel derived lead zirconate titanate (PZT) films with compositions near the morphotropic phase boundary were investigated. It was found that although the films had different thicknesses, grain sizes,…
We describe the electrically enhanced growth of needle crystals from the vapor phase, for which there exists a morphological instability above a threshold applied potential. Our improved theoretical treatment of this phenomenon shows that the instability is present in both polar and non-polar systems, and we provide a…
XPS, ATR-FTIR, 19 F MAS solid-state NMR, and imaging TOF−SIMS have been used to compare the depth and extent of chemical modification achieved during nonisothermal CF 4 plasma fluorination of nonporous, mesoporous, and microporous polystyrene spheres. It is shown that different depths of functionalization can be achie…
The electron-transfer series [M(CO)2(S2C2Me2)2]0/1-/2- (series 2) have been established, and the previously reported series [M(S2C2Me2)3]0/1-/2- (series 3) confirmed, by voltammetry (M = Mo, W). Redox reactions are reversible with EMo > EW, and all members of each series have been isolated. Members of a given series h…
We have studied phase boundaries and critical scattering on equivalent systems of homopolymer blends and diblock copolymers with different end groups terminating the polymer chains. The aim is to investigate the effect of end groups relative to the effect of the covalent junction in diblock copolymers. Either effect i…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTHighly Efficient and Thermally Stable Nonlinear Optical Dendrimer for ElectroopticsHong Ma, Baoquan Chen, Takafumi Sassa, Larry R. Dalton, and Alex K.-Y. JenView Author Information Department of Materials Science and Engineering Box 352120, Department of Chemistry, Box…
The preparation and characterization of bimetallic nanoparticles at various molar ratios of Au/Pt by the coreduction of chloroauric and chloroplatinic acid with hydrazine in the water-in-oil microemulsions of water/AOT/isooctane at 25 °C were described. The Au/Pt bimetallic nanoparticles prepared using feeding solutio…
The preparation of PolyHIPE foams containing poly(epsilon-caprolactone) from macromonomers by free radical homo- or copolymerization is described. The macromonomers are synthesized from PCL diols and are polymerized in the continuous phase of high internal phase emulsions (HIPEs). Subsequent drying yields low-density…
The overlap of ligand atoms has been analyzed for 32 common enzyme systems. The ligand alignment was determined by superposition of the experimentally determined protein structures. Comparison of the overlapping atoms in terms of atomic contribution to partition coefficient and molar refractivity shows that in most ca…
We present results of experiments and ab initio calculations focused on the stability of Co magnetism in ${\mathrm{ErCo}}_{2}$ exerted to high pressures. In the experiments we have studied pressure effects on electrical-resistivity anomalies in the vicinity of Curie temperature ${(T}_{C}=33\mathrm{K}$ in ambient press…
Changes in the structural properties of sodium alumino-silicate glasses of general formula Na 2 O· x Al 2 O 3 ·(3− x )SiO 2 were investigated as a function of Al 2 O 3 concentration. The experimental evidences provided by density, elastic modulus, glass chemical resistance measures, 29 Si and 27 Al MAS NMR investigati…
The following tungsten fluorides have been synthesized by simple addition reactions or by reduction with tungsten metal at elevated temperature: KWF7, K2WF8, MWF6 (M = K, Na, Rb, Cs), K2WF7, M3WF8 (M = K, Na, Rb), and K3WF6. The compounds were characterized by their Raman spectra and by cyclic voltammetry in the molte…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTPreparing High-Density Polymer Brushes by Mechanically Assisted Polymer AssemblyTao Wu, Kirill Efimenko, and Jan GenzerView Author Information Department of Chemical Engineering, North Carolina State University, Raleigh, North Carol…
The magnetic and magnetotransport properties of field-aligned half-metallic ${\mathrm{CrO}}_{2}$ powders have been studied. Needle-shaped nanoparticles of ${\mathrm{CrO}}_{2}$ have been aligned in a strong magnetic field. The aligned powder sample shows a strong anisotropy along the alignment direction. The conduction…
We found the effect of a hidden photoalignment of a dye-doped nematic liquid crystal (LC) on a nonphotosensitive polymer surface after polarized irradiation of the cell in the isotropic phase. We observed that irradiation resulted in a uniform planar orientation of the LC after cooling to the mesophase. The direction…
The influence of homoatomic d 10 ···d 10 interactions in the structural and physical properties of some copper-containing oxides has been investigated by using semiempirical band structure calculations of the extended Hückel type. Comparison of the band structures of CuAlO 2 and Cu 2 O, two compounds with Cu(I) ions i…
The novel, Mn-substituted undecatungstosilicate [(β2-SiW11MnO38OH)3]15- (1) has been characterized by IR spectroscopy, elemental analysis, and single-crystal X-ray diffraction. Anion 1 is composed of three [β2-SiW11MnO38OH]5- fragments linked via three Mn−O−W (145(1)°) bridges leading to a triangular, chiral entity. T…