Materials Literature
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This paper presents the results of the experimental study of nano and micro indentation size effect on selected (001) oriented face centered cubic (FCC) crystals (Ni, Au, and Ag). Following a detailed description of experimental techniques and correction factors, indentation size effects in (001) oriented Au, Ag, and…
In order to evaluate the possibility of using Cr³⁺ co-doping to modify the emission properties of Pr³⁺-based quantum cutting phosphors, which emit one ultraviolet (UV) and one visible photon from each vacuum-UV photon absorbed, into phosphors that emit two visible photons, the optical spectroscopies between 150 and 75…
We present a novel configuration for a twisted-nematic liquid-crystal display (TN-LCD) that makes it operate as a controllable polarization rotator. We extend a previously reported polarization rotator configuration using a zero-twist LCD inserted between two quarter-wave plates. We first operate the TN-LCD in the pol…
Adsorption dynamics of ${\mathrm{O}}_{2}$ on Cu(100) and on reconstructed $\mathrm{Cu}(100)\text{\ensuremath{-}}(2\sqrt{2}\ifmmode\times\else\texttimes\fi{}\sqrt{2})R45\ifmmode^\circ\else\textdegree\fi{}\text{\ensuremath{-}}\mathrm{O}$ at 300 and $553\phantom{\rule{0.3em}{0ex}}\mathrm{K}$ have been investigated by emp…
Abstract Molten caprolactam, in which a polyamide copolymer (HPN) containing rigid segments was dissolved, was polymerized by means of anionic ROP to in produce polyamide (PA, nylon) 6 blends with HPN in situ. A novel molecular composite was achieved in which toughness and strength were simultaneously improved, as wel…
Abstract An acrylic resin emulsion containing a quaternary ammonium salt (hybrid q ‐chitosan/acrylic resin emulsion) was prepared by emulsion polymerization using an acrylic monomer with and without DAAM. DAAM was used to incorporate a functional keto group into the acrylic resin emulsion. Furthermore, a hybrid chitos…
CoAlO composite antidot arrays were fabricated on self-organized porous anodic aluminium oxide (AAO) membranes. The effects of pore size and film thickness on the magnetism and magnetotransport properties of the CoAlO films were investigated. On increasing the pore dimensions in the arrays, an anisotropic to isotropic…
Ab initio plane wave density functional theory calculations are performed to investigate C adsorption and diffusion on the surfaces and in the subsurfaces of nonreconstructed and reconstructed Ni(100). It is observed that no reconstruction occurs on Ni(100) at a C coverage of 0.11 monolayer (ML), while the surface is…
The present work contributes to establishing the role of hydrogenation and of the substrates in the aluminium-induced crystallization process of amorphous germanium layers. For such a purpose, four series of a-Ge(Al) samples, deposited under identical nominal conditions, were studied: hydrogenated samples, H-free samp…
In this paper, we consider the electro-optic properties of a bistable display device based upon the smectic A phase which can function without polarizers. This scheme is attractive for low-power, high-efficiency devices with indefinite storage. The bistable modes are opaque (write), due to electrohydrodynamic instabil…
TiO 2 rutile nanospheres with an enhanced solid solution of NiO were synthesized via a very energetic pulsed laser ablation on a clamped Ni/Ti target in oxygen for a very rapid heating/cooling and hence pressure effect. Upon electron irradiation, the NiO-dissolved rutile (r) was partially transformed into 2(011̄) comm…
In the present work, solidification of a hyper-eutectic ammonium chloride solution in a bottom-cooled rectangular cavity (i.e. with stable thermal gradient) is numerically simulated. The role of finger convection and remelting on the structure of a mushy layer containing channels is studied. The numerical simulation i…
Linear and nonlinear optical properties of lanthanum-modified lead zirconate titanate (Pb 0.92 La 0.08 )(Zr 0.65 Ti 0.35 )O 3 (PLZT 8/65/35) ferroelectric thin films are presented in this paper. The PLZT ferroelectric thin films were grown on quartz substrates by radio-frequency magnetron sputtering at 650 °C. Their c…
High-purity nanocrystalline boron nitride has been successfully synthesized by a simple synthesis method using amorphous B powder and NaN 3 as the reactants and anhydrous CH 3 CN as the solvent at 380 °C. Results from XRD, FT-IR, EELS, and BET absorption measurements suggest that the synthesized product can be indexed…
Recent experiments on particle-reinforced metal-matrix composite materials have shown particle size effects. Small particles tend to give larger plastic work hardening than large particles at the same particle volume fraction. Prior models used to study the particle size effect are based on the strain gradient plastic…
A novel method to synthesize single-wall carbon nanotube (SWNT)/poly(methyl methacrylate) (PMMA) nanocomposite by in-situ polymerization in supercritical CO2 is presented. The surfaces of the SWNT bundles were first functionalized with amino ethyl methacrylate (AEMA) followed by co-polymerization with methyl methacryl…
This paper describes the fabrication and evaluation of carbon nanotube (CNT) electrodes grown on stainless steel (SS) plate and wire for electrochemical sensor applications. Multi-wall carbon nanotubes with different diameters were grown on the SS plate and wire by chemical vapor deposition from an ethylene precursor.…
The activation of C O bond in formaldehyde molecule was followed by IR spectroscopy. IR studies showed that the interaction of formaldehyde with Cu + weakens of the C O bond and results in a red shift of the C O IR band (Δν = 56 cm -1 ). The activation of the C O bond is the result of π back-donation of d electrons of…
Abstract Polymer nanocomposites based on PET and with an intercalated and fairly dispersed nanostructure have been obtained in the melt state. The intercalation and dispersion levels, as well as the mechanical properties, were studied by varying the chemical nature and amount of the organic modification of the clay, a…
Generally, halophilic enzymes present a characteristic amino acid composition, showing an increase in the content of acidic residues and a decrease in the content of basic residues, particularly lysines. The latter decrease appears to be responsible for a reduction in the proportion of solvent-exposed hydrophobic surf…