Materials Literature
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Este trabalho focaliza a obteno de um novo nanocompsito, formado mediante a polimerizao in situ de monmeros de pirrol na superfcie dos poros de vitrocermicas porosas com esqueleto LiTi2(PO4)3, aps troca-inica com cobre. This work is concerned with evidences of a new composite system, formed by in situ polimerization o…
Irradiation of a ferroelectric S C * liquid crystal phase induced by the photochromic dopants (R,R)-6,6′-bis(2-octyloxy)-5,5′-dinitrothioindigo and (R,R)-5,5′-dichloro-6,6′-bis(2-octyloxy)thioindigo at λ=514 and 532 nm, respectively, causes an increase in spontaneous polarization (P S ) by a factor ranging from 1.4 to…
We report on the optimization of synthesis, solubility and crystal growth from solution of 2-amino-5-nitropyridinium l-tartrate (labelled 2A5NPLT). This newly engineered guest-host hydrogen-bonding salt exhibits a quasi-perfect polar alignment of the nonlinear chromophores in the crystalline lattice which is promising…
The E-field dependence of piezoelectric properties of rhombohedral single crystal PZN-4.5%PT were investigated as a function of crystallographic orientation. For <111> oriented crystals, crystal partial depoling and subsequent domain reorientation results in a peak in dij vs. E-field curves at −5kV/cm, followed by non…
Pd/γ-Al2O3 catalysts modified by cerium or lanthanum oxide were prepared according to a standard procedure. The nature of the interaction between the metallic particles and the promoted support was addressed. The effects of changing the following parameters were studied: (i) precursor palladium salt (chloride or nitra…
Optical fibres that are permanently installed in nuclear reactors (fission or fusion) or at high energy physics accelerators can accumulate considerable long-lived radiation-induced loss. Four different fibre types were irradiated up to dose values from 10/sup 3/ to 10/sup 6/ Gy and an attempt was made to reduce the r…
A chiral, nonracemic dendrimer of generation two based on aromatic bis- and tris-amino acids has been synthesised.
We describe the set-up of an energy-dispersive reflectometer installed at the 6 T wavelength shifter (WLS) of the storage ring BESSY-I. It can be used for reflectometry and in-plane diffraction studies of thin films under ambient conditions. Due to the exponential decay of the incident spectrum, the whole useful energ…
Abstract Copper(II) pivalate adduct with triethylamine, [Cu2(piv)4(Et3N)2] (Hpiv = pivalic acid), and cyclic hexanuclear copper(II) complex, [Cu6(piv)6(EtO)6], have been synthesized and characterized by X-ray crystallography and magnetic susceptibility measurement.
Low temperature superplastic behavior of a magnesium alloy, ZK60, was investigated at about half the absolute melting point. The grains were equiaxed with an average size of 6.5 μm. The tensile tests revealed that the material exhibited low temperature superplasticity (LTSP) with elongation-to-failure of over 400%. Mi…
p-Nitroaniline molecules were intercalated between the layers of kaolinite, and an acentric arrangement of p-nitroaniline induced by the asymmteric environment of the interlayer region was accomplished.
A droplet of liquid placed on a flat high-energy solid surface spreads to give a thin film so that no macroscopic droplet shape exists. On a chemically identical solid surface with only the geometry changed to a cylinder, the same droplet can have an equilibrium conformation. When the equilibrium conformation is of a…
Gas sensors based on 2,9,16,23-tetra(2,6-dimethylphenoxy)metallophthalocyanine (TDMP- MPc ) films on interlocking silver electrodes were fabricated by solvent casting from chloroform solutions containing 2,9,16,23-tetra(2,6-dimethylphenoxy)copper, cobalt or nickel phthalocyanine ( TDMP - CuPc , TDMP - CoPc or TDMP - N…
Abstract Thin polymeric films are assembled by the alternating adsorption of oppositely charged polyelectrolytes. The polyions are functionalized by azobenzenes, typically carrying donor‐acceptor substituents. The azobenzene chromophores are exploited as versatile analytical tools, to study the assembling process, and…
Dry etching of Cu film was achieved via oxidation process using oxidizing agents such as O2 plasma, O3, or O3 plasma, followed by the removal process of the copper oxides (CuOx) by reaction with hexafluoroacetylacetone [H(hfac)] to form volatile copper compound, [bis-hexafluoroacetylacetonate: Cu(hfac)2] and H2O. The…
Vanadium dioxide films have been deposited on silicon substrates by reactive RF cathodic sputtering from and targets. The optical measurements show a good contrast at the semiconductor-metal transition, but exhibit two kinds of hysteresis cycle: a narrow and symmetrical one, and a wider and asymmetrical one. We have m…
The adsorption isotherms for the octylphenol ethoxylate, TX100, onto a range of bentonites and a saponite have been determined and the resulting thermal stability of composites has been studied. In general TX100 exhibited a high affinity for the different clay surfaces although the maximum amount adsorbed varied with…
Abstract The nutrient saturated growth and the competition between Limnothrix redekei and some spring diatoms for phosphate were studied in semi‐continuous cultures at 10°C with a 6/18 h light/dark cycle and at 15 °C with a 12/12 light/dark cycle. Under these conditions in unialgal cultures, the maximum specific growt…
The temperature dependence of Vickers hardness (H) of TeO2-Based glasses such as 15Na2O⋅15ZnO⋅70TeO2 as host glasses for rare-earth doped optical amplifier was measured from room temperature to the glass transition region. The following features were found; (1) crack formation under the indenter easily occurs, the Vic…
ents on the Properties of Steel . . . . . . . . . . . . . . . . 6-19 ment of Iron and Steel . . . . . . . . . . . . . . . . . . . . . . . 6-19 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-21 FRANK E. GOODWIN Vice President, Materials Science, ILZRO, Inc. DON GRAHAM Manager, Tur…