Materials Literature
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Single-phase thin films of NaxCoO2 have been grown epitaxially by pulsed-laser deposition technique. The growth conditions were studied based on the logpO2−1∕T phase diagram of Co–O2 using different types of substrate materials. For Na0.58CoO2, metallic behavior is found down to 4.2K. At the request of the authors, th…
As a part of our systematic study of phase transitions in liquid crystal dimers we report here the variation of density across the phase transitions Isotropic – Smectic A and Smectic A – Smectic F exhibited by the Schiff base liquid crystal dimeric compounds of α,ω-bis(4-alkylanilinebenzylidene-4′-oxy)alkane (m.OnO.m)…
Abstract The kinetics of ascorbic acid degradation in drumstick ( Moringa olifera ) leaves as well as in pure ascorbic acid solutions at the initial concentrations present in drumstick leaves over a temperature range of 50–120 °C (isothermal temperature process) has been studied. The degradation kinetics of ascorbic a…
Simulations of the formation and structure of colloidal crystal ordering that emerge from phase-separation–phase-ordering–texture processes driven by thermal quenches of an isotropic phase of polymer–rigid-rod mesogens are presented and characterized using spinodal-decomposition measures and liquid-crystal defect phys…
Carbon nanotubes were synthesized by chemical reduction of magnesium carbonate with metallic lithium at 600 degrees C. The nanotubes with an average length of 13 microm and diameter of 60 nm are made of short coaxial conical cylinder tubular graphite sheets with their cone axis parallel to the tube axis, different fro…
The oxidative electrodeposition of NiTSPP (tetrakis(4-sulfonatophenyl) Ni porphyrin) on ITO electrode from 0.1 M NaOH aqueous solution has been studied, and UV-visible and reflection FTIR spectroscopies have been used to analyze the composition of such film. By use of UV-vis spectroscopy, small absorbance of the film…
We show that the helical superstructure in chiral smectic-C-type liquid crystal phases can, if the pitch is short enough, give rise to the tristate switching characteristic of antiferroelectrics even if the local commensurate order is synpolar as in the ordinary Sm-C* phase. Since the field-induced helix unwinding exh…
An impurity-driven magnetic phase transition has been investigated in LaCoO 3 at temperatures below that of the thermally induced spin state transition of the Co 3+ ion. We have discovered a saturating component of the magnetisation, which we attribute to previously unobserved interactions between magnetic excitons. T…
ArF immersion lithography is considered as the most promising next generation technology which enables to a 45 nm node device manufacturing and below. Not only depth of focus enlargement, immersion lithography enables to use hyper numerical aperture (NA) larger than 1.0 and achieve higher resolution capability. For 19…
The aim of this communication is to probe the possibility of increasing the barrier for reversal of magnetization in the family of new cyano-bridged pentanuclear Mn(III)2Mn(II)3 clusters in which single molecule magnet behavior has been recently discovered. In this context, we analyze the global magnetic anisotropy ar…
We present a detailed study of the anisotropic optical properties of mesoporous silicon layers prepared from substrates having different doping levels under various preparation conditions. We demonstrate that the morphology of the layers strongly depends on the preparation conditions. It correlates with measured optic…
The photocatalytic oxidation (PCO) of trace amounts of propane (500 ppm) on nanocrystalline anatase TiO2 has been investigated in situ as a function of temperature (T = 318-473 K), humidity (C(H2O) = 0-4%), and time by means of mass spectrometry and diffuse reflectance Fourier transform infrared spectroscopy (DRIFT).…
Intercalated and exfoliated models of polymer nanocomposites based on poly(epsilon-caprolactone) and functionalized montmorillonite clay are studied by means of molecular dynamics simulations. Intercalated and exfoliated models are considered for probing the structural characteristics of the corresponding nanocomposit…
Zinc porphyrin-appended dendrimers, 12PZn, 18PZn, 24PZn, and 36PZn, containing 12, 18, 24, and 36 zinc porphyrin units, respectively, were synthesized using zinc porphyrin dyad (2PZn) and triad (3PZn) as precursors. Although these dye-functionalized dendrimers all serve as chiroptical sensors for an asymmetric bipyrid…
Oxide superlattices and microstructures hold the promise for creating a new class of devices with unprecedented functionalities. Density-functional studies of the recently fabricated, lattice-matched perovskite titanates (SrTiO3)n/(LaTiO3)m reveal a classic wedge-shaped potential well for the monolayer (m = 1) structu…
A novel organic−inorganic hybrid material constructed from mixed molybdenum−vanadium polyoxoanion clusters and [Ni(en) 2 ] 2+ complex groups {[Mo VI 5 Mo V 3 V IV 8 O 40 (PO 4 )][Ni(en) 2 ]}[Ni(en) 2 ] 2 ·4H 2 O ( 1 ) (en = ethylenediamine), has been prepared under hydrothermal conditions and structurally characterize…
The electrooxidation behavior of BH4(-) on electrocatalytic Pt, hydrolytically active Ni, and noncatalytic Au electrodes were comparatively reexamined and a more generalized reaction mechanism was proposed to explain the very different anodic properties of BH4(-) on the different metal electrodes. In this mechanism, t…
We present simulation results for the phase behavior of flexible lattice polymer chains using the Wang-Landau sampling idea. These chains display a two-stage collapse through a coil-globule transition followed by a crystallization at lower temperatures. Performing a finite-size scaling analysis on the two transitions,…
Abstract Effects of the various coatings (whey protein isolate, chitosan and shellac) on fresh eggs quality were evaluated based on the interior quality and sensory evaluation during 4 weeks of storage. During storage, all egg weights and albumen heights decreased and albumen pH increased. The lowest weight loss (0.75…
We study a two-dimensional electron gas in a perpendicular magnetic field in the presence of both Rashba and Dresselhaus spin-orbit interactions. Using a Bogoliubov transformation we are able to write an approximate formula for the Landau levels, thanks to the simpler form of the resulting Hamiltonian. The exact numer…