Materials Literature
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Gold nanowires have been produced by the self-assembly of gold nanoparticles onto multi-walled carbon nanotubes. The nanotubes were mixed with a suspension of gold nanoparticles, resulting in a decrease in color intensity of the suspension, and indicating binding between the nanotubes and the gold (see Figure). Subseq…
Commercially available cordierite and mullite powders were used to obtain cordierite and cordierite-30wt% mullite materials by attrition milling, uniaxial pressing and sintering. Cordierite powders were the coarse (D50 = 1.82 mum), medium (D50 = 0.9 mum) and fine (D50 = 0.45 mum) single granulometric fractions and bin…
Previous studies have documented the presence of increased red blood cell aggregability in patients with ischemic heart and brain diseases. We adapted a simple slide technique and image analysis to reveal the state of erythrocyte adhesiveness/aggregation (EAA) in the peripheral blood of 206 such patients and in 174 co…
The pop-in phenomenon, quite common in fracture mechanics tests of welded joints, corresponds to a brittle crack initiation grown from a local brittle zone (LBZ) that is arrested in reaching the higher toughness material that surrounds this LBZ. A methodology to obtain a high percentage of pop-in occurrence in laborat…
Microstructure development and phase formation processes during sintering of silicon carbide based materials with AlN-Y2O3, AlN-Yb2O3, and AlN-La2O3 sintering additives were investigated. Densification of the materials occurred by liquid-phase sintering mechanism. Proportion of alpha- and beta-SiC powders in the initi…
Organo-clays were prepared by exchange cations of the montmorillonite with tetramethylammonium (TMA)- and hexadecylpyridinium (HDP)-chloride. Two different montmorillonite types were studied. Two amounts of each organic substances (1 and 4 cation exchange capacity times of montmorillonite) were contacted with each mon…
The microstructural evolution of the CuZnAl shape memory alloys was studied by indirect techniques relating to the atomic migration rate of grain boundaries. Addition elements were used in a Cu-15,5Zn-8,0Al alloy to provide a comparison with the same alloy without microelement additions. The alloys were melted in an i…
The optimization of the energy generated by a MagnetoHydroDynamic (MHD) channel using a superconducting magnet demands the optimization of the magnetic field of the system and of the critical points on the magnet winding. This work must include the development of a high performance superconductor wire suitable for thi…
Molasses containing sucrose, pectins, water and alcohol interacts with lime to form homogeneous blends. Rheological studies indicate that they exhibit viscoelastic behaviours as entangled polymers. Elastic modulus in these blends is much higher than for sucrose/lime/water model system. This difference is attributed to…
A rheological approach of muddy debris flows is presented for environmental engineering and risk assessment purposes. The debris flow is viewed as a hyperconcentrated suspension of non brownian solid particles. Experimental and theoretical studies are presented versus the concentration. The experimental work generally…
CBN grinding wheels are superabrasive tools, with cutting ability higher than the conventional ones, specially used for grinding DTG (Difficult to Grind) materials. Due to the higher hardness and thermal conductivity of the CBN superabrasive grains, when compared with conventional abrasive grains, the use of CBN tools…
The total current-induced force on atoms in a Cu wire containing a vacancy are calculated using the self-consistent one-electron density matrix in the presence of an electric current, without separation into electron-wind and direct forces. By integrating the total current-induced force, the change in vacancy migratio…
The basal transcription machinery of archaea corresponds to the core components of the eucaryal RNA polymerase II apparatus. Thus, archaea possess a complex multi-subunit RNA polymerase, a TATA box-binding protein and a protein termed transcription factor B (TFB), which is a homologue of eucaryal transcription factor…
In this work we use x-ray photoelectron spectroscopy (XPS) to analyze the principal core levels of a ZrO2 thin film deposited on glass using Zr(OPri)3(dpm) (OPri=isopropoxy; hdpm=2,2,6,6-tetramethyl-3,5-heptanedione) as precursor. Besides the general survey, charge corrected binding energies for the Zr 3d5/2, Zr 3d3/2…
We have demonstrated that the population feeding from the I11/24 level to the 1.5 μm fluorescence emitting I13/24 level of Er3+ ions in low phonon energy glass hosts can be enhanced by codoping with Ce3+ under optical pumping at 980 nm. The nonradiative energy transfer Er3+: 4I11/2; Ce3+: 2F5/2→Er3+: 4I13/2; Ce3+: 2F7…
The behavior of cellulose in molten salt hydrates, e. g., LiClO4*3 H2O, ZnCl2*4 H2O, LiCl*5 H2O and mixtures of thiocyanates was investigated. Melts, which give rise to a swelling or dissolution of the cellulose were the focus of interest. The melt composition and species, the water amount and the structure of the coo…
Vacuum ultraviolet absorption measurement was carried out in silica glass over a wide temperature range from 4 to 1900 K, and structure of the absorption edge and its origin have been elucidated. The main factor that determines the Urbach tail of silica glass is the thermal vibration rather than the structural disorde…