Materials Literature
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The effect of coupling agent and fiber content on physical and mechanical properties of a lignocellulosic material-thermoplastic polymer composite was examined. Using poplar fiber as the reinforcing filler, polypropylene as the thermoplastic matrix polymer, and maleated polypropylene as the coupling agent, reinforced…
Wall bushings, apparatus bushings, transductors (DCCTs) and post insulators are vulnerable to flashover in HVDC converter stations under conditions of non-uniform (N-U) wetting, fog, etc. Experience is reported over a 30 year period in preventing external insulation flashovers through the use of booster sheds or RTV c…
Formation of different types of nanosized Al-containing oxide precipitates in an Fe-Cr-Al alloy (PM 2000) was studied by electron energy loss spectroscopy (EELS) using a transmission electron microscope (TEM). It was shown that Y3Al5O12 (garnet) and YAlO3 (perovskite) as well as -Al2O3 and -Al2O3 precipitates can be d…
Peptides are the most promising molecules for nanotechnologies. Stable derivatives suitable for supramolecular design can be synthesized even from the simplest amino acid, glycine. Oligoglycines are able to form an unusual (noncanonical) structure, so-called polyglycine II, where peptide helices 3 1 (ϕ = −76.9°, ψ = 1…
Using direct glass imprinting with glassy carbon molds, one-dimensional surface-relief gratings with 500 nm pitch were fabricated on phosphate glasses. The maximum grating height attained in this study was 730 nm, which was formed by pressing at the softening temperature of the glass at a constant pressure of 0.4 kN/c…
Abstract Desorption experiments performed on four Cu-adsorbed palygorskites suggest that the leached Cu 2+ ion originates at the surface and/or net-like interstice of the palygorskite fibres. The leached fraction, calculated from the quantities of adsorbed Cu 2+ before and after desorption, is <1%. This may indicat…
We demonstrate the growth of ZnO nanorods on a Si(100) substrate through a two-step process, annealing and off-axis pulsed laser deposition (PLD), without a catalyst. ZnO powder was first dispersed on the Si substrate, and annealed to form seeds for ZnO nanorod growth for 2.5 h. In the second step, ZnO was deposited o…
The preparation of different hexagonal, orthorhombic and cubic polymorphs of the solid solution Ba 1−x Sr x CoO 3−δ (0 ≤ x ≤ 1) is described. The samples have been studied by thermal analysis (TG and DTA) to identify the phase transitions; the thermal structural evolution and the structural characterization of differe…
The electrical conduction in insulating materials is a complex process and several theories have been suggested in the literature. Many phenomenological empirical models are in use in the DC cable literature. However, the impact of using different models for cable insulation has not been investigated until now, but fo…
Neste trabalho investigamos o efeito de diferentes compatibilizantes na reometria de torque, propriedades mecânicas e morfologia das blendas de PA6/PEAD. As blendas foram preparadas em uma extrusora dupla-rosca contra-rotativa com filetes totalmente interpenetrantes, a 240 °C em todas as zonas e velocidade de 50 rpm.…
Electromigration in short Cu interconnects was studied under a number of conditions in Cu/Low-K technologies. Observed failure distributions displayed increasing dispersion of the failure times, characterized by the lognormal σ, as the Blech critical threshold, (jL)c, was approached. Simulations show that the apparent…
The magnetic properties and the magnetic entropy change Δ S have been investigated for Gd 6 Co 1.67 Si 3 compounds with a second-order phase transition. The saturation moment at 5 K and the Curie temperature T C are 38.1 μ B and 298 K, respectively. The Δ S originates from a reversible second-order magnetic transition…
A novel transient technique is developed to measure the thermal diffusivity of one-dimensional microscale wires. In this technique, a pulsed nanosecond laser is used to quickly heat the wire. After laser heating, the wire temperature decays slowly. Such temperature decay is sensed and used to determine the thermal dif…
ZnO tetrapods uniformly distributed over the surface of zinc foils were synthesized in situ at 900 °C in air. Control experiments indicate that ZnO tetrapods are evolved from ZnO microspheres and their clustered complexes, which act as the centers advancing to further one-dimensional (1D) growth and branching structur…
Copolymers of aniline with p‐toluidine were synthesized for different molar ratios of the respective monomers in acid medium. The electrical conductivity, charge transport and spectral characteristics upon incorporation of p‐toluidine units into the polyaniline backbone were investigated. The electrical conductivity o…
A low-voltage driving liquid crystal (LC) lens of large aperture is realized using a newly developed water-borne thermosetting paint with weak conductivity. The conductive film turns the spatially abruptly varying electric field into a smoothly varying electric field to produce the lenslike distribution of refractive…
ABSTRACT Thermal-spray coatings are widely used in marine structures including offshore pipelines without external cathodic protection (CP). Al, Zn and Zn-Al thermal-spray coatings protect steel by acting both as barrier coatings and as sacrificial anodes at local defects where corrosion would otherwise occur. Zn prov…
Indium tin oxide (ITO) films were deposited on glass substrates by ion-assisted electron beam evaporation, followed by annealing in vacuum and air at different temperatures from 200 to 350 °C with an interval of 50 °C for 1 h. The deposited films were analyzed by a four-point probe method, Hall effect measurement, an…
A new type of hierarchically porous materials is fabricated by assembling mesoporous nanoparticles via spray drying. Well-dispersed mesostructured silica nanoparticles (MSN), whose particle size distribution was narrow in the range of 20 nm and 50 nm, were prepared by a thermal deposition method. By spray drying a MSN…
Single crystals of the modification Ge(tP12) are prepared by compressing semiconductor-grade germanium to pressures above 11(1) GPa and heating to temperatures between 1200(100) and 1500(150) K before a stepwise cooling precedes a complete pressure release. The tetragonal crystal structure of Ge(tP12) is refined by me…