Materials Literature
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Mesogenic compounds belonging to the two well-known -cyanophenyl, and -isothiocyanatophenyl homologous series, which distinctly differ in the molecular polarity (-C identical with N, 5D; -N=C=S, 2.5D), show an essential difference in the pretransitional dielectric behavior in the vicinity of the isotropic to nematic (…
Conservation of water molecules was identified by a cluster analysis of seven crystal structures of alanine racemase from Bacillus stearothermophilus. A total of 47 clusters of consensus water sites were determined and found to be highly localized, as indicated by their low mobilities. These clusters are located in th…
The crystal and magnetic structure as well as elastic, magnetic, and electrotransport properties of ${\mathrm{La}}_{0.88}{\mathrm{MnO}}_{x}$ $(2.82<~x<~2.96)$ manganites have been investigated as a function of oxygen content by x-ray, neutron diffraction, Young's modulus, magnetization, and resistivity measureme…
We present a comparative study of the charge-ordered states in orthorhombic and monoclinic forms of $\ensuremath{\theta}\ensuremath{-}(\mathrm{B}\mathrm{E}\mathrm{D}\mathrm{T}\ensuremath{-}\mathrm{T}\mathrm{T}\mathrm{F}{)}_{2}{\mathrm{TlZn}(\mathrm{SCN})}_{4}$ $[\mathrm{B}\mathrm{E}\mathrm{D}\mathrm{T}\ensuremath{-}\m…
We have performed ferroelectric field effect experiments using an epitaxial heterostructure composed of ferroelectric Pb(Zr0.2Ti0.8)O3 and superconducting Nb-doped SrTiO3. The films were prepared on (001) SrTiO3 substrates by off-axis radio-frequency magnetron sputtering and pulsed-laser deposition. By switching the p…
Abstract With the aim of selecting a precursor of a polyhedral oligomeric silsesquioxane (POSS) reacted with aromatic diamines for its incorporation into an epoxy network, to generate an organic–inorganic hybrid material containing POSS, a polyhedral oligomeric silsesquioxane (glycidylisobutyl–POSS) was reacted with t…
We present measurements of the line tension and the viscous drag of a disclination line in nematic liquid crystal via observation of thermal fluctuations of the line position. Fourier analysis of the displacement of a disclination line due to thermal fluctuations was used to obtain the amplitudes and the relaxation ra…
A high-density electron emission more than 20 mA/cm2 was achieved from a cold cathode fabricated by simple plasma etching nanocraters onto a graphite substrate. The magnitude of the field enhancement factor was about 30 000, which is similar to that for the highest reported performance for carbon nanotube. The perform…
A novel aliphatic polyester containing a malonate group in the main chain was prepared by one-pot reaction of malonyl dichloride with ethylene glycol in the presence of triethylamine. The NMR, IR, and UV−vis studies revealed that the polymer partially underwent intra- and intermolecular Knoevenagel type self-condensat…
Kinetically constrained models (KCMs) are models of glass formers based on the concept of dynamic facilitation. This concept accounts for many of the characteristics of the glass transition. KCMs usually display a combination of simple thermodynamics and complex glassy dynamics, the latter being a consequence of kinet…
Abstract Thermal stability of polyvinyl chloride (PVC) based montmorillonite composites with either sodium montmorillonite (MMT) or alkyl ammonium ion modified montmorillonite (OMMT) were investigated by thermogravimetric analysis. The apparent activation energies associated with the first thermal degradation stage we…
The sound produced by the collapse of discrete cavitation bubbles was examined. Laser-generated cavitation bubbles were produced in both a quiescent and a vortical flow. The sound produced by the collapse of the cavitation bubbles was recorded, and its spectral content was determined. It was found that the risetime of…
Abstract To study the brittle–ductile transition (BDT) of polypropylene (PP)/ethylene–propylene–diene monomer (EPDM) blends induced by size, temperature, and time, the toughness of the PP/EPDM blends was investigated over wide ranges of EPDM content, temperature, and strain rate. The toughness of the blends was determ…
The Raman and IR spectra and force field have been investigated for ${A}_{2}{\mathrm{Mn}}_{2}{\mathrm{O}}_{7}$ $(A=\mathrm{T}\mathrm{l},\mathrm{I}\mathrm{n})$ by means of a short-range force constant model which includes four stretching and four bending force constants. Unusual spectral and force field changes are obs…
NiO ultrathin films have been prepared under UHV conditions on Ag(001) substrate by metal deposition in ${\mathrm{O}}_{2}$ atmosphere. The films were prepared by deposition of the amount of metal correspondent to 1 ML (monolayer) of NiO in the presence of different oxygen-to-metal flux ratios, to investigate the oxyge…
The synthesis and physical properties, in particular electro-optic switching behavior, of 3-chloro-biphenyl-3',4-bis[4-[4-(3,7-dimethyloctyloxy)-phenyliminomethyl]] benzoate are reported. The compound exhibits an antiferroelectric tilted smectic liquid crystalline phase (Sm-CP) in a broad temperature range. Below 20 d…
The structures and magnetic properties of self-assembled copper(II) clusters and grids with the "tritopic" ligands 2poap (a), Cl2poap (b), m2poap (c), Cl2pomp (d), and 2pomp (e) are described [ligands derived by reaction of 4-R-2,6-pyridinedicarboxylic hydrazide (R = H, Cl, MeO) with 2-pyridinemethylimidate (a-c, resp…
We report high-field magnetotransport measurements on ${\ensuremath{\beta}}^{\ensuremath{''}}\ensuremath{-}(\mathrm{BEDT}\ensuremath{-}\mathrm{TTF}{)}_{4}[({\mathrm{H}}_{3}\mathrm{O})M({\mathrm{C}}_{2}{\mathrm{O}}_{4}{)}_{3}]Y,$ where $M=\mathrm{Ga},$ Cr, and Fe and $Y={\mathrm{C}}_{5}{\mathrm{H}}_{5}\mathrm{N}.$ We o…
Abstract The preparation of a new unsymmetrical kink non‐coplanar heterocyclic diamine, 1,2‐dihydro‐2‐(4‐aminophenyl)‐4‐[4‐(3‐phenyl‐4‐aminophenoxy)phenyl]‐(2 H )phthalazin‐1‐one (3), from a readily available unsymmetrical phthalazinone bisphenol‐like (1) was described. The diamine can be directly polymerized with var…
UV-curable polymer films were prepared containing a commercially available, organically modified montmorillonite (MMT). It is believed that nanoclay-containing UV-curable polymers can find wide ranging applications in future microelectronic materials. Polymer films containing the commercially available MMT clay (Nanom…