Materials Literature
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Abstract In this work, the polybutadiene (PB) block of an asymmetric lamellae forming polystyrene/polybutadiene based triblock copolymer was epoxidized to different extent in order to study its effect on morphology and mechanical behaviour of the copolymer. The products were analyzed by means of different microscopic…
During fabrication of anodic aluminum oxide (AAO) membranes, it is observed that sometimes their nanochannels experience bending and branching. In this research the bending and branching behavior of AAO nanochannels was studied. AAO nanochannels were fabricated in 99.56% pure aluminum (Al) in which Si and Fe impuritie…
The potential of carbon nanotubes (CNTs) as nanosensors in detection of genes through a vibration analysis is investigated with molecular dynamics. The carbon nanotube based nanosensor under investigation is wrapped by a gene whose structure includes a single strand deoxyribose nucleic acid (DNA) with a certain number…
Magneto-optics of heterostructures with an InGaAs/GaAs quantum well (QW) and a 3–5 nm spaced ultra-thin ferromagnetic δ-layer of Mn in the GaAs barrier is investigated in detail. While nonmagnetic structures demonstrate very low degree of circular polarization PC of QW photoluminescence, the existence of the close Mn…
Thermotropic nematic materials relax strong distortions by lowering the nematic order: the uniaxial symmetry is broken and is locally replaced by biaxial domains. We investigated the dynamics of the nematic order near a boundary surface of an asymmetric π-cell submitted to an external electric field, close to the elec…
A spatially discretised thermo-electrochemical model is developed to calculate the temperature distribution in a tubular solid oxide fuel cell (SOFC). This is used in a mechanical model to compute the distribution of thermo-mechanical stress in the ceramic membrane-electrode assembly of the cell. The resulting risk of…
A series of processable semi-aromatic polyamides containing thioether units have been developed. They were synthesized through the reaction of 4,4’-bis(4-chloroformylphenylthio)benzene (BPB-DC) and aliphatic diamine by the method of interfacial polycondensation. These polyamides had excellent thermal properties with g…
Among the polymorphs of the compound As 4 S 4 , realgar and β-As 4 S 4 exhibit an interesting phenomenon of light-induced alteration that eventually leads to the transformation to pararealgar and arsenolite through the structural modification of the As 4 S 4 molecule. The mechanism generally invoked to explain the tra…
Anti-inflammatory molecules often display little affinity for inflamed tissues, leading to low accumulation into this site of action (and inefficiency), and high incidence of severe side effects. To face the problem, numerous strategies have been proposed, i.e., chemical modifications to the drug molecule, and enginee…
Abstract Production of nanomaterials by formation of extreme plastic deformation ECAP (Equal‐Channel Angular Pressing) is a way of preparing nano‐structures of engineering materials. A development of a nanostructure in steel AISI 309 (EN X15CrNiSi20.20) with the technology of ECAP, and a new method for determination o…
The feasibility of screen-printing process of hard ferrite magnetic nanoparticles produced by carbon combustion synthesis of oxides (CCSO) is investigated. In CCSO, the exothermic oxidation of carbon generates a smolder thermal reaction wave that propagates through the solid reactant mixture converting it to the desir…
Chemical reduction of graphene oxide represents an important route towards large-scale production of graphene sheets for many applications. Thus far, gas-phase reactions have been demonstrated to efficiently reduce graphene oxide, but a molecular understanding of the reaction processes is largely lacking. Here, using…
An investigation into the electronic structure and phase composition of porous silicon surface layers with a developed structure of nanopores has been carried out using ultrasoft X-ray and X-ray photoelectron spectroscopy. Samples of porous silicon have been obtained on p -type substrates in various regimes of electro…
Numerous carbonic nano-structured materials were reported to demonstrate electron emission in moderate electric field (1 kV/mm or less), even if their surface morphology shows no edges or tips capable of strong local field enhancement. In many such cases, the actual mechanism of emission facilitation remains unclear,…
International audience
Abstract Polyelectrolyte multilayer (PEM) thin films consisting of alternate layers of two PEM systems, that is poly(diallyl dimethyl ammonium chloride)/poly(vinyl sulfate) (PDAC/PVS) and poly(allyl amine hydrochloride) (PAH)/ are successfully deposited on polysulfone (PSF) support using spin‐assisted layer‐by‐layer a…
The spectral, electrochemical, and optical properties of Langmuir-Blodgett films (LBFs) and cast films from a solution of new double-decker cerium bis[tetra-(15-crown-5)-phthalocyaninate] (Ce(R 4 Pc) 2 ) are studied. Based on analysis of compression isotherms and quantum-chemical calculations, schemes of the organizat…
Two new double complex salts [Pd(NH3)4]3[Rh(NO2)6]2 (I) and [Pd(NH3)4]3[Rh(NO2)6]2·H2O (II) are synthesized and characterized. The techniques to produce one-phase residues of the salts are developed. The crystallographic data for I: a = 18.915(2) Å, V = 6767.4 Å3, F-43c space group, Z = 8, d x = 2.548 g/cm3; II: a = 2…
The crystal structure of sodium niobate (NaNbO 3 ) has been investigated by energy-dispersive X-ray diffraction at high pressures (up to 4.3 GPa) in the temperature range 300–1050 K. At normal conditions, NaNbO 3 has an orthorhombic structure with Pbcm symmetry (antiferroelectric P phase). Upon heating, sodium niobate…
A simple glass of champagne or sparkling wine may seem like the acme of frivolity to most of people, but in fact it may rather be considered as a fantastic playground for any fluid physicist. In this tutorial review, the collapse of gaseous CO2 bubbles found at the free surface of a glass poured with champagne is depi…