Materials Literature
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Abstract The parameters that promote the formation of surface defects on multi‐phase polymer systems during injection molding are not yet clearly understood. The objective of this work is to establish the influence of composition, particularly the role of rubber, on the rheological properties of such multi‐phase syste…
Polyvinylalcohol, partially substituted with lipophilic acyl chains, generates polymeric micelles in aqueous phase, containing a hydrophobic core able to encapsulate lipophilic drugs. Two types of polymers were obtained by conjugation of polyvinylalcohol with oleoyl or linoleoyl chains as pendant groups. The polymers,…
C18H37OH–C20H41OH is an example of a binary system showing isopolymorphism. The two alkanols display the same polymorphic behaviour. At low temperatures, they crystallize into the same ordered form γ (C2/c, Z = 8). On heating, γ transforms into the rotationally disordered form R′IV (C2/m, Z = 4), at a few degrees belo…
Experiments were conducted to evaluate the superplastic properties in three orthogonal directions after processing by equal-channel angular pressing (ECAP). Using an Al-3% Mg-0.2% Sc alloy pressed to a strain of ∼8 through route BC, miniature tensile specimens were cut inthe pressing direction perpendicular to the tra…
A novel explosive welding technique which uses underwater shock waves to weld thin sheets and the technical advantages of this technique are reported. Using this technique, a thin metal plate is uniformly accelerated by underwater shock waves. The initial angle of inclination of the explosive pack is determinant in hi…
Abstract We studied the intricate pH‐ and light‐dependent network of the thermal and photochemical reactions of the 4′‐(dimethylamino)‐7‐hydroxyflavylium ion by continuous irradiation, flash photolysis, 1 H NMR spectroscopy, and stopped flow analysis. The distribution of the various forms at the pH‐dependent thermodyn…
With the ever-decreasing size of microelectronics, growing applications of superlattices, and development of nanotechnology, thermal resistances of interfaces are becoming increasingly central to thermal management. Although there has been much success in understanding thermal boundary resistance (TBR) at low temperat…
Silica, SiO2, is typically found in well water supplies. Most of the silica found in well waters is a result of dissolving silica-containing rock. Silica content in brackish water is generally in the range of 20 to 60 ppm. In Salbukh water treatment plant, silica concentration of raw water is about 30 ppm. High concen…
Zn2SnO4, which has an inverse spinel structure, was adopted as the host material of a new green emitting phosphor. The photoluminescent (PL) properties of a series of europium-activated zinc stannate synthesized by vibrating milled solid state reaction have been investigated. One broaden emission band from the Zn2SnO4…
The NADP(+)-preferring glucose dehydrogenase from thermoacidophilic archaeon Thermoplasma acidophilum has been characterized, and its crystal structure has been determined (Structure, 2:385-393, 1994). Its sequence and structure are not homologous to bacterial NAD(P)(+)-dependent glucose dehydrogenases, and its molecu…
It is shown that chromophores can be efficiently grafted on nanometer sized gold particles dispersible in an aqueous solution. The grafting is carried out in two steps: first, a primary grafting of thiols consisting both of stabilisers (2-mercaptoethane sulfonate and thiomaleic acid) and of linker molecules (4-mercapt…
Phonon glass and electron crystal (PGEC) thermoelectric materials have been expected to be a new class of thermoelectric materials for high temperature applications. Among the efforts to optimize the high temperature thermoelectric properties of various PGEC thermoelectric materials, recent experimental works on the S…
A Solid Oxide Fuel Cell-Hybrid System is mainly composed of three parts: the stack, the anodic recirculation system with fuel feeding, and the cathodic side (air side) where turbomachinery and heat exchangers are installed. In Part A of this work the transient models of the fuel cell are described, while in Part B the…
The thermal degradation in air of flexible PVC treated with various metal chelates containing Fe, Co, Ni, Cu, or Zn combined with two compounds Al(OH) 3 and Mg(OH) 2 , have been studied by differential thermal analysis and thermogravimetry from ambient temperature to 1023 K. The kinetic parameters were obtained using…
Isotactic (it) and syndiotactic (st) poly(methyl methacrylate)s (PMMAs) were assembled on a poly(ethylene terephthalate) cell disk (as a solid substrate), which is normally used for cell culture, to produce ultrathin stereocomplex films. Static contact angles of the films using air bubbles in aqueous phase revealed th…
The graphite used in fusion devices as first wall material is porous and consists of granules and voids. The 1–10 µm granules are further composed of graphitic micro-crystallites (5–10 nm), which are separated by micro-voids. Understanding the hydrogen transport and trapping in such granules is an important aspect of…
A series of acrylate functionalized samples based on hyperbranched hydroxy-terminated polyesters with different molecular weights and different degrees of acrylation were synthesized. The obtained urethane acrylates were slightly yellow viscose liquids. Their composition was characterized by FTIR and 1H-NMR spectrosco…
The cast hot working die steel is treated by mechanical vibration (MV) with a frequency of 50 Hz during the solidification process. The experimental results indicate that the MV may break off the dendrites growing from mould wall towards center in the steel during solidification. Therefore, the growth of the dendrites…
N,N′-Diethyl-3,3′-bicarbazyl(DEBC)and N,N′-Diphenyl-3,3′-bicarbazyl(DPBC)was synthesized by the oxidative coupling reaction. The electrochemical properties of DEBC and DPBC were characterized by cyclic voltammetric technique. The oxidation of DEBC occurred at 0.56 V and 0.8 V(vs. Ag/Ag+)and the reduction also at 0.47…
We have explored the effect of the presence of the sulfide layer on the corrosion performance of sulfidized brass-coated steel cords extracted from tires and squalene formulations. The corrosion performance of sulfidized brass cords extracted from various rubber formulations was tested in 3% NaCl electrolyte solution…