Materials Literature
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The hydrodynamic theory of phasonic and phononic disorder is applied successfully to describe the short-range disordered structure of a decagonal ${\mathrm{Al}}_{71.5}{\mathrm{Co}}_{14.6}{\mathrm{Ni}}_{13.9}$ quasicrystal (Edagawa phase, superstructure type I). Moreover, model calculations demonstrate that the main fe…
Abstract Graft copolymer of natural rubber and poly(methyl methacrylate) (NR‐g‐PMMA) was prepared using semi‐batch emulsion polymerization technique via bipolar redox initiation system. It was found that the grafted PMMA increased with the increase of methyl methacrylate (MMA) concentration used in the graft copolymer…
Nine-nanometer-thick ferro- and piezoelectric nanocrown patterns consisting of crystalline BaTiO3 have been prepared by pulsed laser deposition using latex sphere monolayer masks. The unusual crown-like shape of the nanopattern is achieved by selecting the appropriate high ambient pressure during deposition. The ferro…
Understanding the behavior of cavitation bubbles driven by ultrasonic fields is an important problem in biomedical acoustics. The Keller-Miksis equation for nonlinear bubble dynamics is combined with the Voigt model for viscoelastic media. Using experimentally determined values, the effects of elasticity on bubble osc…
Random walk simulations of thermal walkers are used to study the effect of interfacial resistance on heat flow in randomly dispersed carbon nanotube composites. The adopted algorithm effectively makes the thermal conductivity of the nanotubes themselves infinite. The probability that a walker colliding with a matrix-n…
In the framework of the $\mathrm{LDA}+\mathrm{U}$ approximation we propose the direct way of calculation of crystal-field excitation energy and apply it to La and Y titanates. The method developed can be useful for comparison with the results of spectroscopic measurements because it takes into account fast relaxations…
Two templates are better than one! By combining the already known soft-template and sacrificial-template synthetic methodologies, hollow nanostructures of various shapes and materials can be designed without the need for complicated processes such as chemical etching or calcination. Here, CdS nanotubes are prepared fr…
Thin films of p-type ZnO:N have been obtained by thermally oxidizing zinc oxynitride films prepared by plasma enhanced chemical vapour deposition (PECVD). The p-type ZnO:N thin film with a hole concentration of 2.7 × 1016 cm−3 was obtained after an annealing process was conducted at 600 °C. A conductivity transition f…
A comparison of hemolytic and sonochemical activity of ultrasonic cavitation in a rotating tube.
Vapor bubble generation from laser-illuminated gold nano-particles has been investigated as a means of providing nucleation sites for cavitation induced by high-intensity focused ultrasound (HIFU). Pulses from a 532-nm Nd:Yag laser were synchronized with a pulsed 1.1-MHz HIFU source in an acrylamide phantom seeded wit…
Different electrochemical studies were carried out for Zr and its biocompatible alloys Ti-50Zr at.% and Zr-2.5Nb wt.% in solutions simulating physiologic media, Ringer and PBS (phosphate buffered saline) solutions. The results from rest-potential measurements showed that the three materials are spontaneously passivate…
UNLABELLED: A general model has been developed for analyzing the removal of volatile organic compounds (VOCs) by photocatalytic oxidation (PCO) reactors, taking into consideration of the photocatalytic (surface) reaction and the convective mass transfer coefficients including allowance for their spatial dependence. On…
Proceedings of the National Academy of Sciences (PNAS), a peer reviewed journal of the National Academy of Sciences (NAS) - an authoritative source of high-impact, original research that broadly spans the biological, physical, and social sciences.
We study the influence of the boundary conditions at the solid liquid interface on diffusion in a confined fluid. Using an hydrodynamic approach, we compute numerical estimates for the diffusion of a particle confined between two planes. Partial slip is shown to significantly influence the diffusion coefficient near a…
The use of ultra-thin, i.e., monolayer films plays an important role for the emerging field of nano-fluidics. Since the dynamics of such films is governed by the interplay between substrate-fluid and fluid-fluid interactions, the transport of matter in nanoscale devices may be eventually efficiently controlled by subs…
The expanding field of tissue engineering has required the necessity of developing biomaterials that are tissue compatible, biodegradable, and comparable in mechanical properties to that of native tissue. We propose that the blending of two natural polymers, silk fibroin (SF) and chitosan (CS), into a 3D scaffold will…
The magnetic and magnetotransport properties of the oxygen deficient perovskites, $\mathrm{Sr}{\mathrm{Co}}_{1\ensuremath{-}x}{M}_{x}{\mathrm{O}}_{3\ensuremath{-}\ensuremath{\delta}}$ with $M=\mathrm{Nb}$ and Ru, were investigated. Both Nb- and Ru-substituted cobaltites are weak ferromagnets, with transition temperatu…
Recent works dealt with the optical transmission on arrays of subwavelength holes perforated in a thick metallic film. We have performed simulations which quantitatively agree with experimental results and which unambiguously evidence that the extraordinary transmission is due to the excitation of a surface-plasmon-po…
The quantum excitations in glasses have long presented a set of puzzles for condensed matter physicists. A common view is that they are largely disordered analogs of elementary excitations in crystals, supplemented by two level systems which are chemically local entities coming from disorder. A radical revision of thi…
A conversion from ohmic to rectifying behavior is observed for Au contacts on atomically ordered polar ZnO surfaces following remote, room-temperature oxygen plasma treatment. This transition is accompanied by reduction of the “green” deep level cathodoluminescence emission, suppression of the hydrogen donor-bound exc…