Materials Literature
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Abstract Silica as reinforcing filler brings about a low hysteresis in elastomeric compounds. Aim of this work was to promote a better silica‐elastomer interaction by using, as minor ingredients of a compound, isoprene oligomers having a functional group as the chain end. The effect of the functionality was investigat…
Three samples of special lead glass are suggested for radiation protection and radiation shielding. Each one of these samles consist of seven oxides (Lead Oxide, Silicon Oxide, Barium Oxide, Sodium Oxide, Calcium Oxide, Aluminum Oxide and Cerium Oxide) with different weight ratio for each sample. The mass attenuation…
The EPR spectra of the Mn 2+ ion in crystals of the perchlorate hexahydrates Zn(ClO 4 ) 2 · 6H 2 O, Mg(ClO 4 ) 2 · 6H 2 O, and Cd(ClO 4 ) 2 · 6H 2 O were studied in the temperature range 77–320 K under hydrostatic pressure. It is shown that the octahedron of six molecules H 2 O surrounding this paramagnetic ion is con…
The dependences of the pitting potential, determined by potentiodynamic method, on the NaCl solution concentration, pH, and temperature are found. The repassivation potential and the induction time for the pitting under different conditions are determined. The corrosion potential and kinetic parameters of the steel di…
An extension of Beale's and Lehman's model for the formation of porous silicon (PS) layer on p-type substrate is proposed with a view to explain the experimental conditions necessary for obtaining either uniform vertical pores or nonuniform pore branching. A uniformity parameter is defined and correlated with the meas…
Martensitic and reverse transformations in TiNi shape memory alloy subjected to tension test at room temperature are investigated using a thermovision camera. Stress relaxation stages during the loading and unloading branches are induced, respectively. A very large stress drop, caused by the phase transformation, is o…
Corrosion-resistant Ni-based alloys are thought to be strong candidates as a structural material for chemical processes using supercritical water (SCW). In recent years, Cr was considered as the most important alloying element to improve corrosion resistance in SCW. However, high Cr content can cause a phase transform…
The oxidation of a cermet composed of nickel ferrite (Ni x Fe 3− x O 4 ), nickel oxide (Ni y Fe 1− y O), and Ni–Cu alloy (Cu z Ni 1− z ) (with x =0.8, y =0.84, and z =0.44) has been studied by thermogravimetry, at 960°C, under controlled oxygen partial pressure. The rate of oxidation increases with the oxygen partial…
Key parameters for controlling the layer‐by‐layer self‐assembly of ceramic particles were studied using a model system, which consisted of an Si substrate, 100 and 500 nm silica spheres, and a polycation/polyanion combination that provided binding between the substrate and silica particles, as well as between the sili…
Discostella stelligera and allied similar taxa are mainly identified by the presence of marginal fultoportulae located at the end of the striae, and not on the interstriae, as occurs in the genus Cyclotella, from which they have recently been removed. In this paper, valve morphology and ultrastructure of D. stelligera…
Ferromagnetic shape memory Ni–Mn–Ga has been shown to exhibit deformations of up to 9.5% when driven with quasistatic fields. This article is focused on the use of Ni–Mn–Ga as the active element in a dynamic transducer consisting of a solenoid and a low-reluctance, closed magnetic path. Despite the absence of a restor…
Carbon nanomaterials are at the verge of becoming an important material for various industrial applications. The main hurdle in the production of Carbon Nanomaterial (CNM) is the cost of the raw material. There are two components in producing the CNM, the precursors and the technique of the synthesis. It is almost cer…
In single-crystal La 0.7 Ba 0.3 MnO 3 , giant volume magnetostriction was observed for the first time to reach 2.54 × 10 −4 at room temperature and a still larger level of 4 × 10 −4 at the Curie point T C = 310 K in a magnetic field of 8.2 kOe. At the same temperatures and magnetic field, this effect is complemented b…
Scanning probe memories are now emerging as a means of achieving nanoscale resolution data storage. The use of microscopic conductive tips in contact with a phase-change material to record data as amorphous and crystalline marks is one such approach, making use of the large difference in electrical conductivity betwee…
We have investigated charging and flashover characteristics of a polymeric or glass insulator exposed to AC voltage in vacuum in order to develop compact and reliable high voltage VCBs (vacuum circuit breakers). This paper focuses on charging characteristics of a cylindrical model insulator. The charging of an insulat…
Abstract The comparative studies on the miscibility and phase behavior between the blends of linear and star‐shaped poly(2‐methyl‐2‐oxazoline) with poly(vinylidene fluoride) (PVDF) were carried out in this work. The linear poly(2‐methyl‐2‐oxazoline) was synthesized by the ring opening polymerization of 2‐methyl‐2‐oxaz…
Abstract Grounding on the evidence that thiophene or thiazole rings in donor‐acceptor chromophoric systems promote enhancement of charge transfer and nonlinear optical responses, in this work NLO properties have been investigated of organic polymers containing azoic chromophores based on dinitrothiophene or nitrothiaz…
Abstract Mg/Al layered double hydroxide–oleate and –stearate intercalation compounds were successfully synthesized by the reconstruction method under hydrothermal conditions from calcined hydrotalcite. The intercalation compounds were characterized by the high structural regularity as evidenced by the sharp and intens…
The techniques and mechanisms of the surface modification of polypropylene (PP) fiber used in concrete were discussed in details. The recent progress on the modification studies of PP used in concrete was reviewed.
The adhesion of polymer film of PMMA to different surfaces was measured using the shaft‐loaded blister test. The exposure of the films to saturated water vapor generally leads to a decrease in adhesive strength. The adhesion loss was directly related to the moisture accumulation at the polymer/substrate interface as m…