Materials Literature
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The aim of this study was to evaluate the dynamic fatigue strengths at 10(5) cycles and the strains of particulate filler composite resins with and without reinforcing fibers. An UHMWPE (Ribbond), a polyaromatic polyamide fiber (Fibreflex), and three glass fibers (GlasSpan, FibreKor, Vectris Frame) were used to reinfo…
Accelerated weathering studies of untreated and treated oil palm fiber reinforced phenol formaldehyde composites and oil palm/glass hybrid fiber reinforced phenol formaldehyde composites were conducted. Thermal, water, biological and γ radiation effects on the composite properties were analysed. Mechanical properties…
The temperature and the oxygen partial pressure dependencies of the hole and electron conductivities of 20 mol doped Y, Gd, Sm, Nd, La) were measured by the dc polarization method using a Hebb-Wagner's ion blocking cell at 973-1273 K in the oxygen partial pressure range of to −1. All measured data were fitted to the s…
Endonuclease BamHI mutants having an azophenylalanine residue in the dimer interface (azoAla-BamHI) were synthesized; while the activity was almost suppressed using trans-azoAla-BamHI, the cis-isomer generated with photoirradiation recovered its intrinsic activity.
Dimerization of monoporphyrinate lanthanide complexes [Yb(Por)(H(2)O)(3)]Cl, (Por = TTP(2-), TMPP(2-) and TPP(2-)) in the presence of sterically hindered tripodal ligand, zinc Schiff-base, dilute HCl, K(2)CO(3) solution, 4,4'-bipyridine (bipy), and basic 8-hydroxyquinaldine (HQ) solution was observed in CH(2)Cl(2) at…
Abstract Summary: A review of the processes underlying the solid state postcondensation of poly(ethylene terephthalate) (PET) is presented. Fundamental aspects of the reactions are treated, and it is shown that the rate of polycondensation in the solid state depends on the relative rates of two types of diffusion. On…
In cellular networks, a new generation of CDMA or WCDMA-based networks will start operations in most countries in the near future. The standardized WCDMA technology generates new challenges in radio network planning, optimization and QoS management because of the dynamic nature of its radio interface and various new s…
An MHB amphiphile, N-stearoyl-l-glutamic acid (C(18)-Glu), forms disk- and fiber-like nanostructures respectively in hydrophilic and hydrophobic environments due to the inter- and intra-molecular H-bonds.
This study examined sulfur tolerant materials for solid oxide fuel cells (SOFCs) operating on and containing fuels, focusing on the stability and electrochemical performance of perovskite-type materials in a atmosphere under SOFC operating conditions atm, Preliminary results indicate anodes of the general form are sta…
Two new cobalt(ii) cages are reported where the metal core has a high symmetry related to a Platonic solid; the choice of alkali metal used in the base used for deprotonation appears to influence the resulting structures.
Ag2S nanocrystals with a mean diameter of 5.9 nm (sigma= 1.65 nm) and characteristic surface plasmon resonance absorption at 330 nm have been synthesized in water-in-supercritical CO2 reverse microemulsion using the commonly used AOT surfactant with 2,2,3,3,4,4,5,5-octafluoro-1-pentanol (F-pentanol) as cosurfactant.
We report on the use of glassy carbon electrodes modified with 9,10-phenanthraquinone or 1,2-naphthoquinone for their applicability as catalytic materials for oxygen reduction and hydrogen peroxide producers. The stability of these modified electrodes are investigated and found to be suitable for use under ultrasound,…
Different treatment processes such as alkaline washing, bleaching, and slack-mercer ization are used to improve the sorption characteristics of cellulose fibers. The differences between the sorption properties of cellulose fibers are measured with tensiometry, and their sorption velocities are measured with liquids of…
A Fe-Ce-ZSM-5 catalyst elaborated from a new synthesis route exhibits very high NO conversion (75-100%) in the selective catalytic reduction of NO by NH(3) in a wide temperature window (523-823 K), even in the presence of H(2)O and SO(2).
Density functional theory (DFT) calculations and Monte Carlo (MC) simulations are used to calculate the exchange interactions in the Fe(III) cluster [Fe14(bta)6O6(OMe)18Cl6], impossible to determine by conventional methods--the results support a huge ground state spin arising from competing antiferromagnetic interacti…
Abstract A cobalt(II)‐chitosan coordination polymer has been prepared by soaking a chitosan film in CoCl 2 aqueous solution. The results have been investigated by means of X‐ray photoelectron spectroscopy (XPS), Fourier Transform infrared FT‐IR spectroscopy, thermal analysis and electrical conductivity measurements. T…
The in situ synthesis of micrometer and nanometer gold particles in polyaniline (PANI/Au composite) using chemical or electrochemical methods, has been compared. The direct chemical synthesis of PANI/Au is initiated via the spontaneous oxidation of aniline by AuCl 4 − . Gold colloid formation and subsequent reaction w…
The lanthanum strontium cobalt ferrites (LSCF) are a well-known family of mixed oxygen-ionic/electronic conductors that are of interest for use in high-temperature electrochemical devices, such as solid oxide fuel cells and oxygen separation membranes. One of the challenges however in developing these types of devices…
Abstract Research on dendrimers continues to expand as further advances in synthetic methodology and characterization techniques translate to additional applications. Recently, dendritic polymers composed of the natural metabolites glycerol and succinic acid were synthesized, functionalized, and evaluated as new medic…
We synthesized a series of achiral non-symmetric banana-shaped compounds. Some of them were found to exhibit a nematic phase. We are strongly interested in this nematic phase composed of the bent molecule. On the basis of the assumption that the dynamics of the nematic phase of the banana-shaped molecules could be muc…