Materials Literature
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We present a theoretical study on the orbital magnetism in multilayer graphenes within the effective mass approximation. The Hamiltonian and thus susceptibility can be decomposed into contributions from subsystems equivalent to monolayer or bilayer graphene. The monolayer-type subband exists only in odd layers and exh…
Many biological materials, such as glass sponges, nacre or bone have a lamellar structure. While it is well known that weak interfaces between lamellae may deflect cracks and, thus, increase the toughness, we analyze the influence of periodic variations in Young's modulus. Even without weak interfaces, a ratio of 5 be…
Both the approach used and the progress made in the assignment of structure types to the crystal structures contained in the ICSD database are reported. Extending earlier work, an hierarchical set of criteria for the separation of isopointal structures into isoconfigurational structure types is used. It is shown how t…
A layered oxyphosphide, LaNiOP, was synthesized by solid-state reactions. This crystal was confirmed to have a layered structure composed of an alternating stack of (La(3+)O(2-))(+) and (Ni(2+)P(3-))(-). We found that the resulting LaNiOP shows a superconducting transition at approximately 3 K. This material exhibited…
Micro- and macrodroplet evaporation and condensation upon micropatterned superhydrophobic surfaces built of flattop pillars are investigated with the use of an environmental scanning electron microscope. It is shown that the contact angle hysteresis depends upon both kinetic effects at the triple line and adhesion hys…
Abstract Self‐healing functionality is imparted to a poly(dimethyl siloxane) (PDMS) elastomer. This new material is produced by the incorporation of a microencapsulated PDMS resin and a microencapsulated crosslinker into the PDMS matrix. A protocol based on the recovery of tear strength is introduced to assess the hea…
Abstract A novel mesoporous‐nanotube hybrid composite, namely mesoporous tin dioxide (SnO 2 ) overlaying on the surface of multiwalled carbon nanotubes (MWCNTs), was prepared by a simple method that included in situ growth of mesoporous SnO 2 on the surface of MWCNTs through hydrothermal method utilizing Cetyltrimethy…
Abstract Hierarchical assembly of hollow microstructures is of great scientific and practical value and remains a great challenge. This paper presents a facile and one‐pot synthesis of Cu 2 O microspheres with multilayered and porous shells, which were organized by nanocrystals. The time‐dependent experiments revealed…
A self-similarity model applying the Sierpinski carpet approximation for the effective dielectric constant of nanoporous low- k dielectrics is proposed based on the statistically self-similar characteristics of pore size distributions in the medium and on the 'mixture rule' technique. The proposed model for the dielec…
Oxide heterojunctions composed of manganite films of different tolerance factors and SrTiO 3 : Nb are fabricated and their rectifying properties are experimentally studied. The current–voltage characteristics of the junctions are found to be dominated by diffusion current at high temperatures and by tunnelling current…
Failure of patterned multiwalled carbon nanotubes during field emission (FE) was systematically studied at different fields using an indigenous FE setup. Here, the findings are reported from the experimental observation of the degradation of carbon nanotube (CNT) based field emitters over a silicon substrate. The CNTs…
The purpose of this work is to study the kinetics of self-assembly in the formation mechanism of anionic templated mesoporous solids (AMS-n) during the first few seconds of the synthesis as well as to demonstrate the use of alternating ion current (AIC) conductivity measurements to follow the self-assembly in complex…
In this work we present the results of selective chemical etching of amorphous vanadium pentoxide films after their modification by ultraviolet (UV) radiation. V 2 O 5 resist can be either positive or negative, depending on the developer composition. It was shown that UV-exposed V 2 O 5 films after development and vac…
A versatile approach designing supramolecular assemblies for molecular magnetism relies on metallosupramolecular polyelectrolyte amphiphile complexes, which are self-assembled from ditopic bisterpyridine ligands, transition metal ions, and amphiphilic molecules. We report on measurements at powdered samples using ener…
The behavior of a two-dimensional neutral Coulomb fluid in the strong association regime (low density, high ionic charge) is explored by means of computer simulation and the hypernetted chain integral equation. The theory reproduces reasonably well the structure and thermodynamics of the system but presents a no-solut…
Hydrogenated diamond (HD) samples exhibit a p-type surface conductivity (SC) which is caused by transfer doping to an adsorbed liquid electrolyte layer. We report on gas sensing experiments showing that such samples selectively respond to NO2and NH3gases at room temperature. Successive substitution of H-terminated sur…
We report a method for the directed electrodeposition of polymer films in various patterns using spatially controllable electric field gradients. One- and two- dimensional surface electric field gradients were produced by applying different potential values at spatially distinct locations on an electrode surface. Vari…
ABSTRACT A comparative evaluation of fatigue and fracture behaviour of commercially produced cast and forged rail wheels has been made using specimens extracted from various locations of the wheel quadrant. A systematic investigation in the web and rim regions of the wheel quadrant with various notch orientations show…
Compositional and temperature dependent thermoelectric power measurements have been performed on the polycrystalline manganite perovskite system: La 1− x Ca x MnO 3+δ ( x = 0.00, 0.25, 0.33, 0.50 and 1.00), in the paramagnetic state ( T > T c ) (300–673 K). The Seebeck coefficient (α) has been used to calculate the Fe…
We report, for the first time, the atmospheric pressure synthesis of nonagglomerated nanoparticles (20–60 nm in diameter) of the uncommon monoclinic phase of some heavy rare earth sesquioxides RE 2 O 3 (RE=Dy, Ho, Er, Tm, and Yb). The RE 2 O 3 nanoparticles, prepared by a flame synthesis process, were characterized by…