Materials Literature
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The ab initio full potential linearized augmented plane wave (FP-LAPW) method within density functional theory was applied to study the structural and electronic properties of the compounds SrS, SrSe, SrTe and their alloy SrS1−xSex in the NaCl structure. Results are obtained using both the local density approximation…
A new test device for temperature-dependent permeation measurement, existing of a mass spectrometer and sample holders inside a climatic chamber was developed. The front face of a sample is loaded with the atmosphere in the cabinet or a test gas mixture, respectively. The permeated species are accumulated in a cell be…
Our first-principles calculations show that if the hydrogen atoms on one of the faces of a graphane sheet (prehydrogenated graphene) are substituted with Li atoms, the resulting monolayer attains a good hydrogen storage capacity of around 3.8 wt % close to the revised Department of Energy (DOE) target. It is observed…
Grazing incident small angle x-ray scattering (GISAXS) and transmission small angle x-ray scattering studies have been carried out on periodic patterns on silicon substrates in order to determine the average morphology and arrangement of the patterned features. The GISAXS pattern exhibited rods of scattering at Bragg…
Problem statement: Silver Nanoparticles (Ag-NPs) have been synthesized by using chemical reduction method into the interlayer space of a Montmorillonite (MMT) as a solid support which is used to antibacterial application and polymer nanocomposites for fabrication of medical devices. Approach: AgNO3 and NaBH4 were used…
When a liquid droplet is located above a super-hydrophobic surface, it only barely touches the solid portion of the surface, and therefore slides very easily on it. More generally, super-hydrophobic surfaces have been shown to lead to significant reduction in viscous friction in the laminar regime, so it is of interes…
One of the major concerns related to flight safety is the impact of birds. To minimize the risks, there is the need to improve impact resistance of aircraft by developing high-performance materials and better structural design of aircraft structures. Because of their remarkable impact properties, fiber metal laminates…
Introduction of CO 2 is a facile way to tune the growth of vertically aligned double- or single-walled carbon nanotube (CNT) forests on wafers. In the absence of CO 2 , a double-walled CNT convexity was obtained. With increasing concentration of CO 2 , the morphologies of the forests transformed first into radial bloc…
Using a cryomechanical treatment method (an alternative method of intense plastic deformation), nanocrystalline bulk titanium of technical-grade purity with average grain-size up to 35nm has been obtained for the first time. The method is based on the authors’ previous investigations of the role of twinning in the low…
The specific activity of 0.8% Pt/Al2O3 catalysts in the deep oxidation of C1–C6 n-alkanes increases with an increase in the Pt particle size from 1 to 3–4 nm. Further coarsening of the particles insignificantly changes the specific activity. The size effect was studied for a series of catalysts containing platinum nan…
An ultrahigh-vacuum setup for studying the interaction of ions with a solid by the thermodesorption spectroscopy method has been developed. The residual pressure achieved in the setup after heating is <2 × 10 −7 Pa (the main component of the residual gas is H 2 ). A sample suspended by two tungsten wires is inserted i…
The authors have found that liquid gallium exhibits as a good graphitizing catalyst for a large area graphene sheet. While gallium and carbon are known to be an insoluble system, the authors have found that the catalytic reaction occurs at a very narrow interfacial region between amorphous carbon and liquid gallium. A…
A new diatom genus Conticribra is erected to accommodate C. tricircularis, described from a freshwater Pliocene deposit in Trout Creek, Oregon (USA). The genus accommodates species possessing: (i) loculate areolae with (semi-) continuous cribra; (ii) non-plicated valve face; (iii) rimoportula located on the valve mant…
Biodegradable elastomers have recently found widespread application in many areas of biomedical engineering such as tissue engineering, drug delivery, and bioimaging. In particular, the recent developments in research have led to the creation of citric acid based polymers with enhanced mechanical properties, novel des…
The scattering cross-section sigma(s) of a gas bubble of equilibrium radius R(0) in liquid can be written in the form sigma(s)=4piR(0) (2)[(omega(1) (2)omega(2)-1)(2)+delta(2)], where omega is the excitation frequency, omega(1) is the resonance frequency, and delta is a frequency-dependent dimensionless damping coeffi…
The present paper deals with the synthesis and characterization of ZnO nanoparticles obtained by coprecipitation method at three different pH conditions. Samples characterizations aimed at understanding their spectroscopic properties are carried out using a variety of experimental techniques. X-ray diffraction and tra…
YFeO 3 nanocrystals have been prepared via coprecipitation of yttrium and iron(III) chlorides with aqueous ammonia. The average size, morphology, and magnetic properties of the YFeO 3 nanoparticles are shown to be highly dependent on the preparation procedure.
This paper is motivated by experiments in which time series of tracer particles in viscoelastic liquids are recorded using advanced microscopy. The experiments seek to infer either viscoelastic properties of the sample Mason and Weitz, Phys. Rev. Lett.
Natural fibres are partly replacing currently used synthetic fibres as reinforcement for polymer composites. Jute fibre bundles were high-cellulose-content modified by alkali treatment, while the bagasse fibre bundles were modified by creating quinones in the lignin portions of fibre surfaces and reacting them with fu…
Phthalocyanines (Pcs) are organic compounds able to act as chemical recognition systems because of the various physical effects induced in them by interaction with a large number of gases. The gas response, stability and other sensing characteristics of the Pc films are affected by many factors, such as film morpholog…