Materials Literature
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Suitable pH of the phosphating bath is crucial to restrain resolving rate of magnesium and obtain high quality phosphate coatings because of the high activity of magnesium. In this investigation a compact zinc phosphate coatings on AZ91D were successfully obtained from the phosphating bath with pH=2.15∼2.5. This figur…
Abstract Isotactic polypropylene (iPP) based nanocomposites filled with calcium carbonate nanoparticles (CaCO 3 ) were prepared by melt mixing and structure‐properties relationships of the nanomaterials were studied. Elongated CaCO 3 nanopowders coated with two different coating agents, polypropylene‐maleic anhydride…
Shape memory polymers are defined by their ability to store and recover strains when subjected to a particular thermo-mechanical cycle. The thermomechanical behaviour of shape memory polymers can be tailored by modifying the molecular structure of the polymer or by using the polymer as a matrix of multiphase composite…
The thermal degradation behaviour of rubber from six new Hevea brasiliensis clones (IAC 40, 56, 300, 301, 302 and 303) from São Paulo State, Brazil was studied by thermogravimetry using the Flynn–Wall–Ozawa approach to assess the kinetic parameters (reaction order, activation energy and pre-exponential factor) of the…
In the last two decades, Eyraud tried to interpret the soft characteristics in lead zirconate titanate ceramics (PZT) by an electron transfer between constitutive ions and/or dopants such as Ti3+/4+ or Fe2+/3+. These electron transfers are supposed to minimize the space charges (ρ p ) existing at the domain walls inte…
Abstract A new route has been developed to produce PP/silica nanocomposites starting from porous PP reactor powder and making use of sol‐gel chemistry. Silica‐like, nano‐sized particles were prepared in the pores of the PP reactor powder with a controlled degree of adhesion between PP and silica. Magic‐angle spinning…
The phase behavior of AfmN(BN2AN2)B(1-fmN) multiblock copolymer melts is studied within the weak segregation theory. The interplay between ordering on different length scales is shown to cause dramatic changes both in the ordered phase symmetry and periodicity upon small variation of the architectural parameters of th…
The addition of Al and Ga to b.c.c. Fe increases the magnetostriction of Fe in the [100] direction (a factor of 12 for Fe81Ga19). The Fe-based magnetostrictive materials are machineable, mechanically tough, and saturate in fields of only a few hundred Oersteds, even under compressive loads up to 97 MPa. The effect of…
Poly(muconic acid)s, stereoregular polymer crystals obtained by topochemical polymerization using supramolecular control, function as the layered host solids for organic intercalation, in which alkylamines as the guest species are reversibly inserted into them through an acid-base interaction. We now report a double-i…
Bulk sample (∼7.5mm3) of boron-doped diamond containing 2.6(0.6)at.%B was synthesized by means of direct reaction between boron carbide and graphite in multianvil apparatus at 20GPa and 2700K. Electrical resistance of the sample of B-doped polycrystalline diamond was measured in the temperature interval from 10mK to 3…
Li-doped ZnO thin films (Zn1−xLixO, x=0.05–0.15) were grown by pulsed-laser ablation technique. Highly c-axis-oriented films were obtained at a growth temperature of 500 °C. Ferroelectricity in Zn1−xLixO was found from the temperature-dependent dielectric constant and from the polarization hysteresis loop. The transit…
A cubic phase of C3N4 was discovered. It was recovered at ambient conditions from the graphite-like C3N4 (g-C3N4) phase subjected to pressures between 21 and 38 GPa in a diamond-anvil cell, laser heated to temperatures between 1600 and 3000 K. The x-ray-diffraction data of the phase are best explained by a cubic unit…
Alumina ceramic samples prepared under different sintering temperatures and varied additives were measured to indicate the trap density and trap energy located in alumina materials by using thermally stimulated current (TSC). The surface charges on alumina in vacuum after applying a negative pulse voltage (0.7/4 /spl…
In order to meet increasing requirement for the evaluation and design of damage tolerance of brittle materials, a simple expression was proposed to estimate the damage tolerance quantitatively using basic material parameters, based on the features of damage tolerance and fracture mechanics. The calculated results from…
Analysis of DNA sequences coding for the C-terminus of spider silk proteins from a range of spiders suggests that many silk C-termini share a common origin, and that their physical properties have been highly conserved over several hundred million years. These physical properties are compatible with roles in protein s…
A slurry method was used to determine the dielectric permittivity (ɛ r ) of BaTiO 3 powders with different characteristics, such as tetragonality ( c / a ratio), density, particle size, and specific surface area. The ɛ r of powders highly depended on their characteristics. In order to extract the effect of each charac…
In this paper the relationship between the near-neutral pH stress corrosion cracking (SCC) resistance and the yield strength of pipeline steels was investigated and an attempt was made to understand the microstructural effect on such a relationship. Pipeline steels ranging from X52 to X100 steels and the weldments of…
SiO 2 -epoxy nanocomposites with different SiO 2 nanoparticle contents are synthesized. Some micro/nanoscopic structural characterizations are studied, including the various degrees of nanoparticle dispersion, free-volume contents, and the interface between the nanoparticles and the polymer matrix. The thermomechanica…
A new type of surfactant with a hydrophile of dendritic polyethylenimine (C(12)(EI)(7)) was synthesized by a cationic polymerization of dodecylamine with aziridine and was used as a stabilizer to prepare Pt colloid, which is then used in situ to prepare carbon-supported Pt nanoparticles. The effects of supporting carb…
Single crystalline ZnO nanorods were prepared by the hydrothermal method with synthesized ZnCl2·4Zn(OH)2 as the precursor. Morphologies of the nanorods were controlled by various reaction conditions with cetyltrimethylammonium bromide (CTAB) as the modifying agent. The nanorods were characterized by XRD, TEM, UV-Vis s…