Materials Literature
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Abstract Carbon nanotubes (CNTs) prepared from ethylene decomposition over the Fe/Al 2 O 3 catalyst are studied in a packed bed (PB) reactor and a nanoagglomerate fluidized bed reactor (NABR), respectively. CNTs sampled at different reaction times are characterized by TEM, Raman spectroscopy, and particle size analysi…
The interaction of the trinuclear mercury(II) complex [(o-C(6)F(4)Hg)(3)] (1) and pyrene leads to the formation of the 1:1 adduct 1.pyrene. The crystal structure of this adduct reveals the existence of supramolecular stacks in which molecules of 1 and molecules of pyrene alternate along the infinite chains. Steady-sta…
Infrared spectra of niobium oxide cluster cations are measured via IR multiple photon dissociation spectroscopy in the 400-1650 cm(-1) region. The cluster cations are obtained directly from a laser vaporization source and irradiated with the infrared light emitted by a free electron laser. For those oxide clusters tha…
How can a crude polydisperse emulsion be transformed into a monodisperse one? Mason and Bibette ( Phys. Rev. Lett. , 77 (1996) 3481) have experimentally discovered this phenomenon by applying a shear step on a crude emulsion. In this paper, we examine how this transformation occurs. Our strategy is to prepare calibrat…
Nanofiber is a broad phrase generally referring to a fiber with a diameter less than 1 micron. While glass fibers have existed in the sub-micron range for some time and polymeric meltblown fibers are just beginning to break the micron barrier, 0.25 micron diameter electrospun nanofibers have been manufactured and used…
Late embryogenesis abundant (LEA) proteins are members of a large group of hydrophilic, glycine-rich proteins found in plants, algae, fungi, and bacteria known collectively as hydrophilins that are preferentially expressed in response to dehydration or hyperosmotic stress. Group 2 LEA (dehydrins or responsive to absci…
The influence of HCl/surfactant ratio ( n HCl / n S ) and synthesis time on the synthesis of the cubic mesoporous molecular sieve SBA-1 were investigated to obtain high-quality materials. The samples prepared at a n HCl / n S ratio of 280 were found to exhibit a higher degree of structural ordering, a higher specific…
Sputtered amorphous Ag0.055 In0.065 Sb0.59 Te0.29, Ge4 Sb1 Te5, and Ge2 Sb2 Te5 thin films were studied by differential scanning calorimetry. The crystallization temperature and the heat of crystallization of the amorphous phases, the melting temperature and the heat of fusion of the crystalline phases, and the heat c…
Large-area monodomain porous alumina arrays with an interpore distance of 500 nm are fabricated by imprint lithography. A 4 in. imprint master fully compatible with silicon technology was developed, which allows imprint pressures as low as 5 kN/cm2 for direct imprint on aluminum. Due to the self-ordering phenomenon of…
Nanoporous carbon with narrow pore size distribution was prepared via a nanocasting technique by direct carbonization of cyclodextrin-silica organic-inorganic hybrid composite. The obtained carbon exhibited very high BET surface area and high pore volume.
The influence of sulfonation degree (n) and central atom nature on singlet oxygen quantum yield (Φ Δ ) were studied for a series of sulfonated phthalocyanine metal complexes MPcS n mix . It was found that in DMSO, where the studied dyes exist as monomers, Φ Δ values are independent of number and position of the sulfog…
The stress–strain behavior of two single crystalline Ni–Mn–Ga alloys with martensitic transformation temperatures above the Curie temperature has been studied during uniaxial compression along the [001] and [110] axes. The superelastic effect associated to the reversible stress-induced martensitic transformation has b…
Sensory and instrumental fabric characteristics that contribute to military clothing comfort are analyzed in a series of studies. A standardized hand evaluation methodology is checked for its sensitivity and reliability and used to characterize thirteen military fabrics. A labeled magnitude scale of comfort is develop…
Abstract Flame retardant Nylon 6 (PA6)/montmorillonite (MMT) nanocomposites have been prepared using direct melt intercalation technique by blending PA6, organophilic clay and conventional fire retardants, such as the melamine cyanurate (MCA) and the combination of decabromodiphenyl oxide (DB) and antimony oxide (AO).…
The complex [Mn(12)O(12)(O(2)CCHCl(2))(16)(H(2)O)(4)] (2) in MeCN exhibits three quasi-reversible one-electron reduction processes at significantly higher potentials than [Mn(12)O(12)(O(2)CMe)(16)(H(2)O)(4)] (1). This has allowed the two-electron reduced version of 2 to be generated and isolated. Reaction of 2 with on…
Abstract The electrochemical, photochemical and chemical control of the magnetic properties in molecular compounds is described. The preparation of various thin films of CrCr and FeFe Prussian blue on a conducting electrode allowed us to control the magnetic properties by varying the oxidation state of the component m…
In this paper, we report on the local apparent dissociation constants of poly(acrylic acid) and poly(allylamine hydrochloride) incorporated in polyelectrolyte multilayer thin films. We assembled 10 polyelectrolyte layers on colloidal silica by the sequential electrostatic adsorption of the polyacid and polybase from a…
The objective of this paper is to characterise sulphate resistance of mortars made from ordinary Portland cement ( PC ) and Portland-pozzolan cement with 35 wt.% of zeolite addition (zeolite-blended cement-ZBC ). Mortars with two different cement types were tested in water and 5% sodium sulphate solution for 720 days.…
Some physical properties of three ornamental granites with different superficial finishes (polished, sawn and flamed) were quantified by standard tests. These granites are commercially known as Rosa Porrino, Rosavel and Blanco Alcazar. The determined properties were: density, open porosity, water absorption, capillari…