Materials Literature
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Bouazzerite, Bi 6 (Mg,Co) 11 Fe 14 [AsO 4 ] 18 O 12 (OH) 4 (H 2 O) 86 , is a new mineral occurring in “Filon 7” at the Bou Azzer mine, Anti-Atlas, Morocco. Bouazzerite is associated with quartz, chalcopyrite, native gold, erythrite, talmessite/roselite-beta, Cr-bearing yukonite, alumopharmacosiderite, powellite, and a…
The sintering temperature of 0.95(Na 0.5 K 0.5 )NbO 3 –0.05BaTiO 3 (NKN–BT) ceramics needs to be decreased below 1000°C to prevent Na 2 O evaporation, which can cause difficulties in poling and may eventually degrade their piezoelectric properties. NKN–BT ceramics containing CuO were well sintered at 950°C with grain…
Because the layered machinable ternary carbide, Ti 2 SC, has a significantly shorter c ‐lattice parameter—as compared with most of the 50+ other so‐called M n+1 AX n (MAX) phase family (M=early transition metal; A=A group element and X=C or N and n=1–3) to which it belongs—it was postulated that its mechanical propert…
Resonant ultrasound spectra of a single crystal and a polycrystalline sample of lawsonite [CaAl 2 Si 2 O 2 (OH) 2 ·H 2 O] have been measured at room temperature and at low temperatures in the region 20-300 K. The influence of known phase transitions at 125 and 270 K is seen in the frequency variations of the resonance…
Long natural cellulose fibers with properties suitable for textile and composite applications have been obtained from wheat straw. This study aims to understand the potential of using wheat straw as a source for long natural cellulose fibers for textile, composite and other fibrous applications. The presence of wax on…
The aim of this work was the implementation of a simple technique for the production of cylindrical collagen-based scaffolds with axially oriented pore channels. Matrices with this particular porous structure have the potential to improve the regeneration of peripheral nerves and spinal cord by physically supporting a…
In the framework of phenomenological model we consider dynamics of a compensated collinear antiferromagnet (AFM) in the presence of spin-polarised current. The model is based on the assumption that AFM spins are localised and spin torque is transferred to each magnetic sublattice independently. It is shown that in AFM…
We report calculations indicating that amorphous $RA{\mathrm{O}}_{3}$ oxides, with $R$ and $A$ trivalent cations, have approximately the same static dielectric constant as their perovskite crystal phase. The effect is due to the disorder-activated polar response of nonpolar crystal modes at low frequency, which compen…
Degradation of mechanical properties of zirconia polycrystals is hardly discussed in terms of solution-precipitation grain-boundary sliding due to experimental controversies over imaging of intergranular amorphous phases at high and room temperatures. Here, the authors applied the techniques of mechanical spectroscopy…
We study magneto-elastic effects in crystals of magnetic molecules. Coupled equations of motion for spins and sound are derived and the possibility of strong resonant magnetoacoustic coupling is demonstrated. Dispersion laws for interacting linear sound and spin excitations are obtained for bulk and surface acoustic w…
Biodegradable nanogels loaded with rhodamine B isothiocyanate-dextran (RITC-Dx) as a model for water-soluble biomacromolecular drugs were prepared using atom-transfer radical polymerization (ATRP) in a cyclohexane inverse miniemulsion in the presence of a disulfide-functionalized dimethacrylate cross linker. UV-vis sp…
In recent years, carbon nanotubes have been utilized for a variety of applications, including nanoelectronics and various types of sensors. In particular, researchers have sought to take advantage of the superior electrical properties of carbon nanotubes for fabricating novel strain sensors. This article presents a si…
Defect accumulation is the principal factor leading to the swelling and embrittlement of materials during irradiation. It is commonly assumed that, once defect clusters nucleate, their structure remains essentially constant while they grow in size. Here, we describe a new mechanism, discovered during accelerated molec…
Hydration of the <1 μm size fraction of a high-charge montmorillonite (Clay Minerals Society Source Clay SAz-1), and of low- and high-charge beidellites (Source Clays SbId-1 and SbCa-1, respectively) was studied by modeling of X-ray diffraction patterns recorded under controlled relative humidity (RH) for Sr- and/o…
Highly ordered mesoporous carbon−titania nanocomposites with nanocrystal-glass frameworks have been synthesized via the organic−inorganic−amphiphilic coassembly followed by the in situ crystallization technology. A soluble resol polymer was used as a carbon precursor, prehydrolyzed TiCl 4 as an inorganic precursor, an…
The existence of systematic variations of isobaric fragility in different supercooled Lennard-Jones binary mixtures is revealed by molecular dynamics simulations. The connection between fragility and local structures in the bulk is analyzed by means of a Voronoi construction. It is found that clusters of particles bel…
The structure of materials.- Elasticity.- Plasticity and failure.- Notches.- Fracture mechanics.- Mechanical behaviour of metals.- Mechanical behaviour of ceramics.- Mechanical behaviour of polymers.- Mechanical behaviour of fibre reinforced composites.- Fatigue.- Creep.- Exercises.- Solutions.
Starre Drahtnetze: Konjugierte mikroporöse Polymernetzwerke sind durch Sonogashira-Hagihara-Kupplung zugänglich. Obwohl diese Materialien amorph sind, können Mikroporen- und Oberflächengröße über die Länge der Phenylenethinylen-Streben eingestellt werden (siehe Bild; das Netzwerk ist blau dargestellt, und ein 1,3,5-su…
A series of nine, frustrated, multidomain peptides is described in which forces favoring self-assembly into a nanofiber versus those favoring disassembly could be easily modified. The peptides are organized into an ABA block motif in which the central B block is composed of alternating hydrophilic and hydrophobic amin…
Rigid wiry nets: Conjugated microporous polymer networks are formed by Sonogashira–Hagihara coupling. Although these materials are amorphous, the micropore size and surface area can be controlled by varying the length of the phenyleneethynylene struts (see picture; the network is shown in blue, and one 1,3,5-substitut…