Materials Literature
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Carbon nanotubes (CNTs) have attracted tremendous attention in recent years because of their superb optical, electronic and mechanical properties. In this article, we aim to discuss CNT-induced polymer crystallization with the focus on the newly discovered nanohybrid shish–kebab (NHSK) structure, wherein the CNT serve…
Friction roll surface processing (FRSP), as a novel severe plastic deformation technique, has been put forward and experimentally investigated. Commercial pure titanium sheets were subjected to FRSP and subsequent annealing. An extremely large strain was imposed on the surface layer of the sheet. Consequently, a unifo…
Hydrostatic pressure effect on Prussian blue type network in RbMn[Fe(CN) 6 ] has been investigated by high-pressure vibrational spectroscopy. Frequencies of the CN stretching modes increase as pressure increases: \(\mathrm{d}\hbar\omega/\mathrm{d}P = 6.4\) cm -1 /GPa for A 1g mode and 4.3 cm -1 /GPa for E g mode. With…
Nature of grain boundaries (GBs) should affect the micro-structural evolution and mechanical properties of metallic micro-crystalline formed by severe plastic deformation. The stability and interfacial bonding of coincidence tilt and twist GBs in Al and Cu have been examined by using the projector-augmented wave metho…
Abstract The monoclinic Sn 2 P 2 S 6 and rombohedral layered SnP 2 S 6 crystals have been investigated by 119 Sn Mössbauer and X‐ray photoelectron spectroscopies. By comparing the isomer shift, quadrupole splitting and binding energies for Sn 3d and 4d core levels in these crystals with such parameters for the metal t…
Abstract The electrosynthesis of polypyrrole (PPy) film has been achieved on glassy carbon electrode (GCE) in aqueous medium of Congo red (CR) by means of cyclic voltammetry (CV). The modified electrode exhibits high electrocatalytic activity toward dopamine (DA) oxidation, with drastic enhancement of the reversibilit…
Cyclic deformation behavior of ultra-fine grained (UFG) Cu of 99.99% purity processed by equal-channel angular pressing was investigated. In tension-compression fatigue tests under strain control, UFG Cu showed cyclic softening. Shear bands were formed along the direction inclined by about 45° from the loading axis. O…
Lieferung erster Klasse: Kern-Schale-Nanoaggregate entstehen in Gegenwart einer hydrophoben Gastverbindung aus einem hydrophil-hydrophilen Blockcopolymer mit einem Block, der β-Cyclodextrin enthält (siehe Bild). Die Polymere können unterschiedliche Gastmoleküle aufnehmen, und über den Empfindlichkeitsunterschied kann…
Synthesis of a series of aluminum complex hydrides, namely, LiAlH4, Li3AlH6, NaAlH4, Na3AlH6, Mg(AlH4)2, MgAlH5, Ca(AlH4)2, and CaAlH5, was attempted by the mechanochemical milling of AlH3 and the other elemental hydrides. Aluminum complex hydrides, except MgAlH5, were synthesized, and their dehydriding (decomposition…
Microstructural changes during equal channel angular pressing (ECAP) in a temperature interval from 523 to 748 K (∼0.6–0.8 Tm) were studied in a coarse-grained binary aluminum alloy Al-3%Cu. Hot ECAP results in grain refinement taking place at all temperatures investigated, leading to a non-uniform development of defo…
Identifying the symmetry of the superconducting order parameter in the recently-discovered ferro-oxypnictide family of superconductors, RFeAsO$_{1-x}$F$_{y}$, where $R$ is a rare earth, is a high priority. Many of the proposed order parameters have internal $\pi$ phase shifts, like the d-wave order found in the cuprat…
Brittle-ductile transition (BDT) behaviour was investigated in low carbon steel deformed by an accumulative roll-bonding (ARB) process. The temperature dependence of its fracture toughness was measured by conducting four-point bending tests at various temperatures and strain rates. The fracture toughness increased whi…
Tensile tests and strain rate jump tests have been carried out at low temperatures (77 K ∼ room temperature (RT)) using pure Cu specimens that were severely deformed by accumulative roll bonding (ARB). The dependence of the flow stress on the temperature and the strain rate has been investigated and the strain rate se…
Composite polymers, which are nylon6 materials with aluminum powders dispersed homogeneously, are prepared. Influences of water absorption on Charpy impact value of composite polymers have been investigated. Although the aluminum dispersion from zero to 40 vol%Al decreases the impact value, the water absorbing treatme…
Excess amount of Mg was intentionally added to fabricate supersaturated ultra-fine grained Al-Mg alloy by high pressure torsion (HPT). Their microstructures and mechanical properties were examined by X-ray diffraction (XRD) analysis, transmission electron microscopy (TEM) and Vickers microhardness test. It was confirm…
Abstract A urea‐based bis‐silylated bipyridine ligand derived from 4,4′‐diamino‐2,2′‐bipyridine has been prepared. Organic–inorganic hybrid materials with a high loading of lanthanide 2,2‐bipyridine moieties were obtained by using the silylated bipyridine as the only siloxane network precursor in the presence of lanth…
The microstructural evolution and the corresponding mechanical properties of a 5052 Al alloy processed by cryogenic rolling followed by warm rolling were investigated. The application of cryogenic rolling combined with warm rolling at 448 K showed a significant improvement of tensile strength up to 452 MPa. The kineti…
Mg-0.7 at%Zn-1.4 at%Y alloys annealed at low temperatures after quenching in water from 520°C were studied by high-resolution transmission electron microscopy (HRTEM) and high-angle annular detector dark-field scanning transmission electron microscopy (HAADF-STEM). Stacking faults, thin bands of a 14H-type long period…
We report $^{57}$Fe-NMR studies on the oxygen-deficient iron (Fe)-based oxypnictide superconductor LaFeAsO$_{0.7}$ ($T_{c}=$ 28 K) enriched by $^{57}$Fe isotope. In the superconducting state, the spin component of $^{57}$Fe-Knight shift $^{57}K$ decreases almost to zero at low temperatures and the nuclear spin-lattice…
High purity Al (99.99%) was subjected to severe plastic deformation through twist extrusion at room temperature. Microstructures were examined for 1 pass and 4 passes on the cross section perpendicular to the longitudinal axis of billets using optical microscopy and electron back scatter diffraction analysis. It was s…