Materials Literature
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Using a high resolution polarimeter, we have measured the temperature dependence of birefringence in the vicinity of smectic-A--smectic-${C}^{*},$ smectic-A--smectic-${C}_{\ensuremath{\alpha}}^{*},$ and smectic-A--smectic-${C}_{A}^{*}$ phase transitions of chiral smectics. We have observed a large pretransitional decr…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTRemarkable Enhancement of Second-Order Nonlinear Optical Properties of Polynorbornenes Having Pendant Chromophores. Use of Hyper-Rayleigh Scattering to Estimate the Tacticity of Rigid Rod PolymersJitendra A. Sattigeri, Chung-Wai Shiau, Chia Chen Hsu, Fen-Fen Yeh, Sean…
A rarity in solid-state chemistry is octahedrally coordinated silicon. Ce16Si15O6N32 is the first nitridosilicate with this structural motif. Most oxosilicates containing octahedrally coordinated silicon are high-pressure phases. In contrast to that Ce16Si15O6N32 has been synthesized under ambient pressure. An SiN6 oc…
RATIONALE AND OBJECTIVES: The therapeutic gain of neutron capture therapy with a neutral macrocyclic gadolinium (Gd) complex (Gadobutrol) was evaluated through in vitro and in vivo studies in a beam of low-energy neutrons. METHODS: Neutron irradiation for both the in vitro and in vivo studies was performed in a beam o…
Near-infrared (NIR) excited surface-enhanced Raman scattering (SERS) has been measured for lysine (Lys) on gold colloid at pH 10.8 and 12.0 where its -amino group is ionized and both the α -and -amino groups are neutralized, respectively. The intensities of SERS signals from Lys are much stronger at pH 10.8 than at pH…
We report coherent inelastic neutron-scattering spectra for the network glass former ${\mathrm{B}}_{2}{\mathrm{O}}_{3}$ measured at temperatures from 100 to 1300 K ${(T}_{g}\ensuremath{\sim}525 \mathrm{K}).$ At the first sharp diffraction peak, which stems from the van der Waals packing of layerlike units, one finds a…
Isomerization behavior of azobenzene chromophores in organic−inorganic polymer hybrids was investigated. Polymer hybrids were prepared from azobenzene-modified poly(2-methyl-2-oxazoline) (POZO-A) and methyltrimethoxysilane (MeTMOS) or tetramethoxysilane (TMOS). Isomerization behavior in polymer hybrids was compared wi…
An automated examination of the native Fourier is tested as a means of evaluation of a heavy-atom solution in MAD and MIR methods for macromolecular crystallography. It is found that the presence of distinct regions of high and low density variation in electron-density maps is a good indicator of the correctness of a…
Matrix-assisted laser desorption/ionization with time-of-flight mass spectrometry is used to examine the formation of N-pyroglutamate (pGlu) in single, identified neurons from Aplysia. Six pGlu peptides are identified in the R3-14 and the R15 neurons that result from in vivo processing of peptides containing either Gl…
The difference in the surface-assisted in-plane photoalignment of a nematic liquid crystal between poly[methyl ( p -methacryloyloxy)cinnamate] (pCin0) and poly[methyl ( p -methacryloyloxyethoxy)cinnamate] (pCin2) in a film state is described. Irradiation of a film of pCin2 with linearly polarized 313 nm light generate…
Abstract The self-assembly of sodium stearate and its homologs ( >C12) in hydrotalcite (LDH) interlayers was found to change reversibly between mono- and bilayer structures with a ratio changing continuously within a range of 70 °C and 5 °C in stoichiometric intercalations in aqueous dispersion. The bilayer str…
Mixed valence complexes containing ferro- and ferricyanide have been known for almost 300 years, but no dinuclear, non-polymeric examples of these complexes have been structurally characterized. Here we report the first such example, comprising ferrocyanide coordinated to a pentaaminecobalt(III) complex. This FeII−CoI…
Abstract A typical perovskite La 0.2 Sr 0.8 Co 0.2 Fe 0.8 O 3‐δ (LSCF) membrane and a novel perovskite‐related ZrO 2 ‐doped SrCo 0.4 Fe 0.6 O 3‐δ (SCFZ) membrane were successfully prepared. The sintered membranes were characterized by an in‐situ high‐temperature X‐ray diffraction, scanning electron microscopy and ener…
Phase transformations in organic superconductor $\ensuremath{\kappa}\ensuremath{-}{(\mathrm{B}\mathrm{E}\mathrm{D}\mathrm{T}\ensuremath{-}\mathrm{T}\mathrm{T}\mathrm{F})}_{2}{\mathrm{Cu}[\mathrm{N}(\mathrm{CN})}_{2}]\mathrm{Br}$ and its deuterated analog have been studied by resistance measurements of structural relax…
The absorption and fluorescence spectra of terthiophene (TT) as well as three substituted terthiophene derivatives, namely 3,3‘ ‘-dimethoxy-2,2‘:5‘,2‘ ‘-terthiophene (DMOTT), 3,3‘ ‘-dimethyl-2,2‘:5‘,2‘ ‘-terthiophene (DMTT), and 3‘,4‘-dihexyl-2,2‘:5‘,2‘ ‘-terthiophene (DHTT), isolated in an alkane matrix and in their…
We report on high-frequency (300--700 GHz) ferromagnetic resonance (HF-FMR) measurements on cobalt superparamagnetic particles with strong uniaxial effective anisotropy. We derive the dynamical susceptibility of the system on the basis of an independent-grain model by using a rectangular approach. Numerical simulation…
Changes in the optical-absorption properties of hydroxyl group (\ensuremath{\equiv}SiOH) in silica glasses were studied to determine the specific form of \ensuremath{\equiv}SiOH whose absorption takes place at around the intrinsic absorption edge of silica glass (\ensuremath{\sim}8 eV). In the experiments, four kinds…
The crystallographic texture of electroplated Cu in damascene trenches has been examined by x-ray diffraction pole figure analysis. The influence of two post-plating treatments on the resulting orientation of (111) planes of the Cu inside the trenches are compared. When the as-deposited small-grained Cu is allowed to…
The coupled Hartree–Fock (CHF) equations in second order are derived to calculate dynamic polarizabilities and hyperpolarizabilities for infinite periodic chains. The analytical expressions for the second derivatives of the perturbed crystal orbitals with respect to the quasimomentum k are developed. The first and sec…
Cosputtered Ta–Si–N amorphous films of ten different compositions were investigated as a barrier material for Cu interconnection. The films of relatively low nitrogen content (<47 at. %) undergo an abrupt failure with the formation of tantalum silicides and copper silicide between Si and Cu during annealing. Ta…