Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTTrap State Emission from TiO2 Nanoparticles in Microemulsion SolutionsHirendra Nath Ghosh and Soumyakanti AdhikariView Author Information Radiation Chemistry & Chemical Dynamics Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400 085, India Cite this: Langmuir 2001, 17…
Poly(styrenesulfonate) (PSS) was adsorbed reversibly from aqueous CsCl or NaCl solutions onto oppositely charged DODAB (diocatadecyldimethylammonium bromide) monolayers at the water surface. By adjusting the DODAB lateral density, the surface charge of the liquid interface is varied. The electron density profile of th…
Three-dimensional superlattices forming films oriented along the substrate and dots deposited on a film made of 8 nm cobalt nanocrystals have been fabricated. The magnetic properties of such artificial structures are compared.
Four novel low-spin bis(amine) Co(III) porphyrins [Co(TPP)(BzNH(2))(2)](SbF(6)), 1, [Co(TPP)(1-BuNH(2))(2)](SbF(6)), 2, [Co(TPP)(PhCH(2)CH(2)NH(2))(2)](SbF(6)), 3, and [Co(TPP)(1-MePipz)(2)](SbF(6)), 4, have been synthesized and characterized by low-temperature X-ray crystallography, IR, electronic, and NMR ((1)H, (13…
We analyze a self-consistent theory of crack growth controlled by a cumulative damage variable d(t) dependent on stress history, in the quasistatic regime where the sound wave velocity is taken as infinite. Depending upon the damage exponent m, which controls the rate of damage dd/dt~sigma(m) as a function of local st…
The interactions of polyaniline coatings on low-density polyethylene films with aqueous viologen solutions were investigated. The coatings were characterized by X-ray photoelectron spectroscopy, electron spin spectroscopy, UV−visible absorption spectroscopy and sheet resistance measurements. The results showed that th…
Abstract Dynamic viscoelastic measurements were made for storage ( E ′) and loss ( E ″) tensile moduli of water‐absorbable polymers such as nylon‐6, nylon‐66, poly(vinyl alcohol), ethylene–vinyl alcohol copolymers, and regenerated cellulose under the control of stepwise scanned relative humidity at constant temperatur…
Hydrostatic pressure is used to modulate the intermolecular interactions in the conjugated oligophenyl, para -hexaphenyl. These interactions affect the structural properties and also cause changes in the molecular geometry that directly alter the electronic properties. We use Raman spectroscopy to investigate the natu…
The surface modification by chemical or physical adsorption of a polyelectrolyte (polyallylamine, PAH) was established using hydrolyzed polycarbonate (PC) and poly(ethylene terephthalate) (PET) thick and thin films. Contact angle data indicated changes in the hydrophilicity of PET film surfaces in terms of the chemica…
Laser-ablated palladium, platinum, silver, and gold atoms react with molecular oxygen in excess neon during condensation at 4 K. Reaction products, M-(η 2 -OO), M-(η 2 -OO) 2 (M = Pd, Pt), PtO, PtO 2, AuO 2, M-(η 1 -OO) (M = Ag, Au), and anions Ag-(η 1 -OO) -, Au-(η 1 -OO) 2 -, are identified from isotopic shifts and…
An analysis of the mechanical properties and a detailed structural study of samples of syndiotactic polypropylene (sPP) are presented in order to clarify the origin of the elastic behavior of sPP. Samples of sPP having different stereoregularity and showing different polymorphic behavior have been analyzed. The presen…
Crystallization and melting of n -paraffins of chain lengths up to C 60 H 122 can be largely reversible, and practically no supercooling is seen in differential scanning calorimetry (DSC) and temperature-modulated DSC (TMDSC). To find the changes with chain length for this effect, polyethylene fractions of oligomers o…
The drug substance hydroxytriendione has been found to exist in three modifications, which are equal in their pharmaceutical profile and are equally stable. Thus, Form II, the polymorph thermodynamically stable at room temperature, was chosen as the solid-state form for the active pharmaceutical ingredient. Spontaneou…
A neutron diffraction study of the non-linear optical (NLO) material 4-nitro-4'-methylbenzylidene aniline (NMBA) is presented. NMBA exhibits a large macroscopic second-order NLO susceptibility, chi((2)), and this study shows that hydrogen bonding is, in part, responsible for this. No hydrogen bonding was reported in t…
Theoretical methods to calculate the optical response of crystals are reviewed. The second-harmonic generation coefficients of borate nonlinear optical crystals are calculated using the anionic group theory combined with the Gaussian'92 ab initio calculation method. Without adjusting the parameters, the calculated val…
Electronic structure of the system ${\mathrm{Y}}_{2\ensuremath{-}x}{M}_{x}{\mathrm{BaNiO}}_{5} (M=\mathrm{C}\mathrm{a},\mathrm{S}\mathrm{r})$ was calculated for $x=0,$ 0.2, and 0.5 using the full-potential linearized augmented-plane-wave method. To describe the exchange and correlation the local spin-density approxima…
We report on the effect of off-stoichiometry on the temperature dependence of electrical resistivity, the Seebeck coefficient, and the Hall coefficient in the Heusler-type ${\mathrm{Fe}}_{2}\mathrm{VAl}$ compound. While the stoichiometric ${\mathrm{Fe}}_{2}\mathrm{VAl}$ exhibits a semiconductorlike resistivity behavio…
Surface lamellar decoration (SLD), surface enhanced Raman scattering (SERS) and optical second harmonic generation (SHG) experiments have been utilized to study the molecular orientation and conformation changes at a rubbed polyimide alignment-layer surface. This aromatic polyimide containing pendent cyanobiphenyl mes…
We used high-resolution angle-resolved photoemission spectroscopy to reveal the Fermi surface and key transport parameters of the metallic state of the layered colossal magnetoresistive oxide La1.2Sr1.8Mn2O7. With these parameters, the calculated in-plane conductivity is nearly one order of magnitude larger than the m…
The energies, widths, and shapes of features observed in the total energy distributions in field emission from W(100) and W(111) are compared with the results of a full-potential LAPW calculation of the surface density of states based on a supercell model of the crystal structure at the metal-vacuum interface. The Swa…