Materials Literature
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This paper reports a study on template-growth and electrochemical properties of single-crystal vanadium pentoxide (V 2 O 5 ) nanorod arrays from VOSO 4 aqueous solution using electrochemical deposition. Uniformly sized vanadium oxide nanorods with a length of about 10 μm with diameters ranging from 100 to 200 nm were…
This review addresses the fabrication and properties of novel polyelectrolyte microcapsules, with an emphasis on their mechanical and permeability properties. Ease of preparation through layer-by-layer self assembly, accurate control over wall thickness as well as flexibility in the choice of constituents make these c…
This paper concerns new healthy aspects of clothing. The research studies were undertaken to determine the influence of natural and synthetic fibres, which were covering transiently the forearm muscles on the activity of motor units in these muscles. The electrophysiological parameters of motor units were measured wit…
Abstract Position of the main optical absorption band (Q-band) in electronic spectra of some trans-[M(Pc)L2]k (Pc = substituted or unsubstituted phthalocyaninate, M = Co(III), L = CN−, k = −1; M = Sn(IV), L = Cl−, k = 0; M = Sb(V), L = Cl−, k = +1) complexes depends only on the refractive index of the solvents, indica…
The phase diagram of prolate and oblate particles in the restricted orientations approximation (Zwanzig model) is calculated. Transitions to different inhomogeneous phases (smectic, columnar, oriented, or plastic solid) are studied through minimization of the fundamental measure functional (FMF) of hard parallelepiped…
Abstract Summary: This work presents the first synthesis of a new polymer obtained by catalytic addition of the SiH groups of a poly[methyl(H)silane‐ co ‐methylphenylsilane] backbone to an N ‐(allyl)cycloimmonium salt. This hybrid polymer was characterized by spectroscopic analysis, thermogravimetric analysis and gel…
The present article focuses on theoretical elucidation of possible effect of mechanical deformation on spatio-temporal emergence of unusual polymer morphology subjected to quiescent isothermal crystallization conditions. The present theory developed is based on a phase field model consisted of non-conserved time depen…
A new low dielectric constant (k) material suited to electronic materials applications was developed using hollow keratin fibers (HF) and chemically modified soybean oil. High-speed microelectronics is facilitated by preventing the “rubber necking,” or slow-down of electrons on the printed wires through the use of low…
Abstract Summary: The effectiveness of some thermoplastic elastomers grafted with maleic anhydride (MA) or with glycidyl methacrylate (GMA) as compatibilizer precursors (CPs) for blends of low density polyethylene (LDPE) with polyamide‐6 (PA) has been studied. The CPs were produced by grafting different amounts of MA…
Progress is reported on several questions that bedevil understanding of granular systems: (i) are the stress equations elliptic, parabolic or hyperbolic? (ii) how can the often-observed force chains be predicted from a first-principles continuous theory? (iii) How to relate insight from isostatic systems to general pa…
We have carried out shear-deformation simulations on amorphous Mg-Cu systems at zero temperature and pressure, containing 2048-131072 atoms. At the largest size a smooth stress-strain curve is obtained with a well-defined flow stress. In the smallest system there are severe discontinuities in the stress-strain curve c…
We use the density-functional theory to calculate the total energy of mixed crystals (Ga,Mn)As with a small concentration of various donors. We find that the formation energy of Mn depends strongly on the partial concentrations of Mn in the substitutional and interstitial positions, and on the concentration of other d…
Over the last decade advances in high temperature superconducting (HTS) materials have generated a renewed optimism in the use of this technology in future high-power applications including motors, generators, and power transmission. The most promising superconducting material, YBa2Cu3O6+x (YBCO), has demonstrated cur…
Natural fibre-based composites have been intensely studied in the last years due to their specific properties and their clearly positive environmental impact. Other advantages of using vegetable fibres are related to their economical production and processing, their safe handling and working conditions. Therefore, lig…
Abstract Summary: This paper reviews recent approaches for making intumescent systems. The mechanisms of action involving intumescence are described and commented on. Synergistic aspects using zeolites and organoclays are also considered and discussed. New strategies are examined on the basis of the mechanism of intum…
We calculate the resonant electronic Raman scattering for the Falicov-Kimball model near the Mott transition on a hypercubic lattice. The solution is exact, and employs dynamical mean field theory.
At present, there is no direct experimental evidence that primary silica particles, which exist only transiently for a few seconds during the Stöber silica synthesis, can be stable in aqueous solutions. In the present work, we show that primary silica particles are formed spontaneously after the dissolution of diglyce…
Large-scale atomistic simulations are performed to study different mechanisms of plastic deformation in uncapped submicron thin polycrystalline copper films. It was recently shown that diffusional mass transport along grain boundaries in thin films leads to the formation of a novel defect identified as a diffusion wed…
Calculating the Peierls energy and Peierls stress from atomistic simulations of screw dislocation dynamics: application to bcc tantalum, Guofeng Wang, Alejandro Strachan, Tahir Çağin, William A GoddardIII
A cooling profile for a seeded pharmaceutical crystallization designed to achieve a desired mean crystal size is found by minimizing the batch operating time subject to a crystallization model. In many systems, optimizing a characteristic of the product crystal size density is the usual objective. This objective is no…