Materials Literature
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Optical recording in a ferroelectric liquid crystal using smectic layer rotation induced by the application of asymmetric voltage pulses has been proposed. This recording method is based on the temperature dependence of the rotation rate and the fact that the rate in the smectic A (SmA) phase is considerably smaller t…
The infrared, Raman and inelastic neutron scattering spectra of the approximately tetrahedral ternary metal hydrides: Mg2NiH4, Rb3ZnH5 and their deuterides have been observed and assigned. This has enabled a comparison of some of the properties of the first row transition ternary metal hydrides.
The effect of ambient-pressure reduction on multibubble sonochemiluminescence (MBSCL) is studied experimentally with a luminol solution through measurements of MBSCL intensity as a function of ultrasound irradiation time, applied voltage to a transducer and ultrasonic frequencies to accomplish high efficiency in chemi…
Iodine-doped multiwall carbon nanotubes (I-MWNTs) were characterized by means of Raman scattering and thermogravimetric analysis. The results show that multiwall carbon nanotubes (MWNTs) can be effectively doped by iodine and exchange electrons with iodine. Iodine atoms form charged polyiodide chains inside tubes of d…
A negative-tone inorganic-organic hybrid SiO(2):TiO(2) glass is investigated for fabrication of refractive microlenses. This sol-gel material enjoys an advantage over materials used in conventional photoresist-based fabrication techniques in that it lends itself to a single-step etching-free process. The application o…
We have performed a comprehensive study of the electronic structure and magnetic properties of structurally characterized models for diiron-oxo proteins. Results from Kohn–Sham density functional theory show that two complexes, with formula Fe2(μ-O)(μ-O2CCH3)2(HBpz3)2 and [Fe2(μ-OH)(μ-O2CCH3)2(HBpz3)2]+, are strongly…
Two types of clusters, [Ag(Se2P(OR)2)]n (R = Et, n = ∞, 1a; R = Pri, n = 6, 1b) and Ag10(μ10-Se)[Se2P(OR)2]8 (2a, 2b) were obtained from the reaction of stoichiometric amounts of Ag(CH3CN)4PF6 and NH4Se2P(OR)2 in (C2H5)2O at −20 °C. These new silver(I) clusters containing diselenophosphate (dsep) ligands were characte…
The polyoxometalate cluster [CoII4(H2O)2P4W30O112]16- (Co-POM) embedded in a self-assembled polyelectrolyte matrix shows a remarkable pH dependence of its electrochemical response, opening a route to use Co-POM as a molecular probe or to fabricate pH microelectrodes.
A new single walled carbon nanotubes (SWCNTs) purification procedure has been developed; it consists in a combination of air treatment and acid microwave digestion leading to a high purity SWCNTs material; the procedure reaches high metal removal percentages and the operation time is drastically reduced compared to co…
The control of the refractive index of laminated coatings consisting of alternating stacks of nanoscale Al2O3 and TiO2 sublayers grown by atomic layer deposition has been achieved. The refractive index of the coating linearly changed from 1.870 to 2.318 as the thickness of the single TiO2 sublayer was varied from 2.0…
By use of first-principles calculations, we investigate the effect of introducing substitutional boron or nitrogen atom in the tip on field-emission properties of capped single-wall carbon nanotubes. We find that the substitution in the tip can significantly enhance the localized density of states at the Fermi level,…
We report results of a high-pressure investigation by Raman spectroscopy of a classic relaxor ferroelectric (relaxor) ${\mathrm{PbMg}}_{1/3}{\mathrm{Nb}}_{2/3}{\mathrm{O}}_{3}$ (PMN), which is considered to be a model system for the understanding of relaxor and relaxor-related materials. The observed pressure-dependen…
Low-frequency Raman-scattering experiments have been performed on thin films consisting of nickel-silver composite nanoparticles embedded in alumina matrix. It is observed that the Raman scattering by the quadrupolar modes, strongly enhanced when the light excitation is resonant with the surface dipolar excitation, is…
We report on the precise placement of a single carbon nanotube (CNT) onto a microlectromechanial system (MEMS) structure. Using a hybrid atomic force microscope/scanning electron microscope (AFM/SEM) system, an individual multiwalled CNT was retrieved from a cartridge by the AFM tip, translated to a MEMS device, and t…
Based on the theoretical exploration of electronic structures, we propose that the ordered double perovskites $\mathrm{La}A{\mathrm{VRuO}}_{6}$ and ${\mathrm{LaVO}}_{3}/A{\mathrm{RuO}}_{3}$ (001) superlattice $(A=\mathrm{Ca},$ Sr, and Ba) are strong candidates for half-metallic (HM) antiferromagnets (AFM's). We have s…
We have investigated the electronic structure of the p-type diluted magnetic semiconductor ${\mathrm{In}}_{1\ensuremath{-}x}{\mathrm{Mn}}_{x}\mathrm{As}$ by photoemission spectroscopy. The Mn $3d$ partial density of states is found to be basically similar to that of ${\mathrm{Ga}}_{1\ensuremath{-}x}{\mathrm{Mn}}_{x}\m…
The compressibility and thermal expansion of the cubic silicon nitride $(c\ensuremath{-}{\mathrm{Si}}_{3}{\mathrm{N}}_{4})$ phase have been investigated by performing in situ x-ray powder-diffraction measurements using synchrotron radiation, complemented with computer simulations by means of first-principles calculati…
The superconducting ferromagnet RuSr2GdCu2O8 was investigated at high pressure. The intra-grain superconducting transition temperature, Tc, is resolved in ac-susceptibility as well as resistivity measurements. It is shown that the pressure shift of Tc is much smaller than that of other high-Tc compounds in a similar d…
A theoretical framework is developed to describe experiments on the structure of epitaxial thin films, particularly niobium on sapphire. We extend the hypothesis of dynamical scaling to apply to the structure of thin films from its conventional application to simple surfaces. We then present a phenomenological continu…
We describe in this paper the development of plugged hexagonal templated silicas (PHTS) which are hexagonally ordered materials, with internal microporous silica nanocapsules; they have a combined micro- and mesoporosity and a tuneable amount of both open and encapsulated mesopores and are much more stable than other…