Materials Literature
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Single crystals of (Ca2CoO3)0.7CoO2 were grown using a modified strontium chloride flux technique, and their electrical and thermal properties were determined. Growth conditions were established for obtaining plate-like single crystals of a relatively large size (5×10×0.05 mm3). At 973 K, thermoelectric power S and el…
The itinerant-electron metamagnetic (IEM) transition and magnetocaloric effects (MCE's) in the $\mathrm{La}({\mathrm{Fe}}_{x}{\mathrm{Si}}_{1\ensuremath{-}x}{)}_{13}$ and $\mathrm{La}({\mathrm{Fe}}_{x}{\mathrm{Si}}_{1\ensuremath{-}x}{)}_{13}{\mathrm{H}}_{y}$ compounds have been investigated. The $\mathrm{La}({\mathrm{…
The influence of titanium content and heat treatment temperature on the optical and mechanical properties of TiO2/γ-glycidoxypropyltrimethoxysilane and methyltrimethoxysilane hybrid films processed by the sol–gel technique are studied for photonic applications. Waveguide film with a thickness more than 1.60 μm is prep…
This paper, the first of two companion papers, reports empirical data on wear properties in carbon nitride coatings by a spherical diamond counter-face in repeated sliding contacts through in situ examination and post-sliding observation, with an emphasis on the effects of friction cycles and normal load. In the repea…
Tris(2-aminoethylamine) (tren)-capped porphyrins bearing electron donating or withdrawing groups on the amino functions of their tripod have been synthesised and the catalytic activity of each complex was carefully studied both as the iron and the iron-copper complexes: only one of our iron-copper complexes was shown…
The utility of different polycarboxybetaines (PCB) as positively charged components of polyelectrolyte complexes was elucidated by potentiometry, turbidimetry, and fluorescence spectroscopy. PCB practically did not quench the fluorescence of either pyrenyl-tagged poly(methacrylic acid) or ethidium bromide intercalated…
The glycopeptide Ac-(Gly-Pro-Thr(beta-Gal))(10)-NH(2) forms a collagen-like triple-helix. A (1)H NMR structural analysis is reported for the peptides Ac-(Gly-Pro-Thr)(n)-NH(2) and Ac-(Gly-Pro-Thr(beta-Gal))(n)-NH(2), where n = 1, 5, and 10. NMR assignments for the individual peptides are made using one- and two-dimens…
When soluble extracts of the extreme acidothermophilic archaeon Sulfolobus solfataricus were incubated with [gamma-(32)P]ATP, several proteins were radiolabeled. One of the more prominent of these, which migrated with a mass of approximately 46 kDa on sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE…
Crystal structure and magnetic properties of Gd(2)([18]crown-6)(2)(OH)(2)(CH(3)CN)(2)[Ni(dmit)(2)](2) (dmit(2)(-) = 2-thioxo-1,3-dithiole-4,5-dithiolate) are reported. Gd(3+) ions (S = (7)/(2)) were introduced into the pi-spin network of [Ni(dmit)(2)](-) (S = (1)/(2)) complex as a binuclear supramolecular cation, Gd(2…
The phase behavior of deuterated polystyrene- block -poly( n -pentyl methacrylate) copolymers (dPS−PnPMA) was investigated by using small-angle X-ray (SAXS) and neutron (SANS) scatterings and rheology. This block copolymer exhibited a closed-loop type of phase behavior as did hydrogenated PS−PnPMA copolymers. The clos…
Abstract Raman spectra were recorded in the range 400–1800 cm −1 for a series of 15 mixed [tetrakis(4‐ tert ‐butylphenyl)porphyrinato](2,3‐naphthalocyaninato) rare earth double‐deckers M(TBPP)(Nc) (M = Y; La–Lu except Pm) using laser excitation at 632.8 and 785 nm. Comparisons with bis(naphthalocyaninato) rare earth c…
The condensation and phase transitions of hydrogen molecules confined in single-walled carbon nanotubes have been studied using ab initio calculations and molecular dynamics simulations. At low temperature the van der Waals surface of a narrow (5,5) tube forces the ${\mathrm{H}}_{2}$ molecules to form quasi-one-dimens…
Measurements of the electrical resistivity $\ensuremath{\rho}$ as a function of temperature T and pressure $P(P<~1.6\mathrm{GPa})$ are reported on ${\mathrm{La}}_{2\ensuremath{-}x}{\mathrm{Sr}}_{x}{\mathrm{NiO}}_{4}$ $(0<~x<~1.2).$ A compositionally induced $M\ensuremath{-}I$ transition occurs for $x>~0.9.…
Abstract Mesoporous silicon oxynitride materials, which were highly ordered and had high nitrogen content, were prepared by heat treatment of fresh SBA15 precursors in flowing ammonium at high temperatures.
Abstract We investigated the spectral features of the ν(NC) bands when 4,4′‐biphenyl diisocyanide (BPDNC) is adsorbed on gold nanoparticle surfaces by surface‐enhanced Raman scattering (SERS). The mode of adsorption of BPDNC on gold nanoparticles was found to change with the bulk concentration. At low concentrations o…
This paper focuses on controlling adsorption of gold nanoparticles onto polymer nanosheets. Amphiphilic copolymers, poly( N -dodecyl acrylamide- co -4-vinyl pyridine)s (p(DDA/VPy)s), were synthesized and the ultrathin p(DDA/VPy) films were prepared by the Langmuir−Blodgett (LB) technique. Gold nanoparticles were immob…
The chromonic lyotropic liquid crystal formed from an aqueous solution of the azo dye C.I. Direct Blue 67 was investigated by means of a temperature-controlled X-ray diffraction technique, polarized optical microscopy, and UV−visible spectroscopy. The dye molecules form columnar aggregates even at low concentrations.…
All epitaxial oxide magnetic tunnel junctions, ${\mathrm{La}}_{0.7}{\mathrm{Sr}}_{0.3}{\mathrm{MnO}}_{3}/{\mathrm{SrTiO}}_{3}/{\mathrm{SrRuO}}_{3}$ trilayer films, composed of ferromagnetic and metallic electrodes were fabricated on STO(001) substrates. Inverse tunnel magnetoresistance (TMR), i.e., higher and lower ju…
A new mesoporous silica structure with cubic Iad symmetry has been synthesized. The structure has very large unit cell dimensions, up to 250 A in the as-synthesized form and 222 A after calcination, and the surface area is around 700 m2/g. The syntheses were done according to well-established synthesis conditions with…
Nitrogen is the most important defect in diamond forming a series of aggregates that are used to characterize different types of diamond. Aggregation of substitutional N and O are investigated using detailed ab initio plane-wave calculational procedures. Different charge states of the N-N substitutional pair (the A ce…