Materials Literature
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The process of dehydration for the molybdenum trioxide hydrates, MoO 3 2H 2 O 2-MoO 3 H 2 O -MoO 3 , was studied for the first time by in situ Mo K-edge x-ray absorption spectroscopy. A regularization procedure was applied to reconstruct the radial distribution functions around the molybdenum at all stages of the proc…
We report on telechelic associating polymers in aqueous solutions that self-assemble into starlike flowers in the dilute regime and develop a fully connected network of flowers above some threshold concentration φ* (∼1 wt %). The peculiarity of these telechelics is that the end caps are partially fluorinated. Small-an…
Three single crystals of sodium zeolite X were fully La 3+ -exchanged at 90 °C from aqueous solution (pH = 7.45, 7.45, and 6.89 at 22 °C, respectively). One was vacuum dehydrated at 400 °C (crystal 1), another at 22 °C (crystal 2), and the third remained fully hydrated (crystal 3). Their structures at 22 °C were deter…
We use a near-field scanning microwave microscope to simultaneously image the dielectric constant, loss tangent, and topography in a PbTiO_3 crystal. By this method, we study the effects of the local dielectric constant and loss tangent in the geometry of periodic domains on the measured resonant frequency, and qualit…
A closer look at the temperature (T) dependence of magnetoresistance (MR) of two polycrystalline magnetic compounds, LaMn$_2$Ge$_2$ and SmMn$_2$Ge$_2$, previously reported by us, is made. A common feature for both these compounds is that the low temperature MR is positive (say, below, 30 K) in spite of the fact that b…
Sulfonation of maleated EPDM (m-EPDM) rubber followed by its neutralization by sodium hydroxide or zinc acetate leads to the formation of an ionomer consisting of two types of ionic association, namely carboxylate and sulfonate anions with Na+ or Zn2+ as the counterion. The products were characterized by infrared spec…
The tensile strength and elongation at break of epoxidized natural rubber (ENR) blended with natural rubber (NR) was studied. ENR 25, ENR 50, and one grade of natural rubber (SMR L) were used as the elastomers. The composition of ENR was varied from 0% to 100% rubber. The accelerated sulfur vulcanization system was us…
CdS nanoparticles precipitated from aqueous solution were studied by 1 H NMR. The nanoparticles were deliberately not capped by any surface termination agent. The samples had porous structure. Proton high spinning speed magic angle spinning (MAS) NMR spectra revealed that there are three abundant proton species in nan…
Four derivatives of diethylenetriaminepentaacetic acid (=3,6,9-tris(carboxymethyl)-3,6,9-triazaundecanedioic acid (H5dtpa)), potential contrast agents for magnetic resonance imaging (MRI), carrying benzyl groups at various positions of the parent structure were synthesized and characterized by a thorough multinuclear…
Morphology, electron structure, and catalytic activity in CO oxidation over a Au/FeO x /SiO 2 /Si(100) model sample prepared by pulsed laser deposition (PLD) have been investigated by X-ray photoelectron spectroscopy (XPS), UV photoelectron spectroscopy (UPS), and transmission electron microscopy (TEM). Two types of s…
Jute fibers in the form of slivers have been reinforced with epoxy resins to prepare composites. The solution impregnation method has been adopted in an attempt to increase the percentage of fiber loading. Both untreated (control) and chemically modified (bleached) slivers have been used to prepare composites. The opt…
An environmentally friendly processing method of polyurethane foam was proposed and evaluated for the application of thermal insulation. For the production of polyurethane foam, chlorofluorocarbon (CFC) gases were eliminated to minimize environmental destruction. Carbon dioxide gas was used as a blowing agent instead…
The nature of the substituents present on a dipyrrolide dianion ligand determines the assembly of Sm(II) clusters which participate to various extents in cluster formation and THF cleavage.
Molecular and electronic structural properties of the hydrogen-bonded complexes of p-quinone dianions (PQ(2)(-)) were investigated by electrochemistry and spectroelectrochemistry of PQ in MeCN combined with ab initio MO calculations. Hydrogen bonding between PQ(2)(-) and MeOH was measured as the continuous positive sh…
Diketopyrropyrroles (DPPs) are industrially important red pigments. The color in the solid state changes variously from vivid red to yellowish red, although no noticeable difference is recognized in the molecular spectra in solution. The correlation between the electronic and crystal structures of some DPP pigments ha…
The modification of an emulsion polymerization with a water-miscible alcohol and a hydrocarbon nonsolvent for the polymer can influence the morphology of the particles. The formation of monodispersed particles with a hollow structure or diffuse microvoids is possible. Both kinetic and thermodynamic aspects of the poly…
Confinement effects on the phase transitions in antiferromagnets are studied as a function of the surface coupling v and the surface field h for bcc(110) films. Unusual topologies for the phase diagram are attained for particular combinations of v and h. It is shown that some of the characteristics of the finite-tempe…
An analysis is given of thermoelastic noise (thermal noise due to thermoelastic dissipation) in finite sized test masses of laser interferometer gravitational-wave detectors. Finite-size effects increase the thermoelastic noise by a modest amount; for example, for the sapphire test masses tentatively planned for LIGO-…
The decomposition of pentachlorophenol (PCP) by sonication was investigated at two frequencies (20 and 500 kHz) and two concentrations (20 and 60 μM) to gain insight into the kinetics and mechanisms occurring at different frequencies. Results suggest the presence of parallel pyrolysis and OH • reaction pathways that a…
Self-assembled monolayers of ferrocene−porphyrin−C 60 triads on gold electrodes were prepared to mimic photosynthetic electron transfer events where efficient conversion of light to chemical energy takes place via the long-lived, charge-separated state with a high quantum yield. Adsorbed amounts of the triads on the g…