Materials Literature
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A completely optical, non-destructive imaging of tracks in a fluorescent crystal provides a new way to detect and to assess doses from heavy charged particles and neutrons. The technique combines confocal fluorescent microscopy with a new radiation-sensitive, luminescent material based on aluminium oxide single crysta…
In this work a successful method for producing high-aspect-ratio nanopatterned single-crystal TiO 2 is presented. The method used is based on nanolithography involving swift heavy ion bombardment through a porous anodic alumina mask. Nanopatterning of large areas allows for fabrication of new devices, for example, pho…
Using a ${\mathrm{SrTiO}}_{3}(001)$ barrier and ${\mathrm{La}}_{0.7}{\mathrm{Sr}}_{0.3}{\mathrm{MnO}}_{3}(001)$ electrodes, we study the case of coherent spin-polarized tunneling of electrons that exhibit a symmetry mismatch with respect to the lower electron barrier height. Due to this mismatch, electrons with energy…
Considerable efforts have been devoted recently to synthesizing diluted magnetic semiconductors having ferromagnetic properties at room temperature because of their technological impacts for spintronic devices. In 2001 successful growth of GaMnN films showing room temperature ferromagnetism and p-type conductivity was…
A real-time optically stimulated luminescence (OSL) dosimetry system for potential in vivo use during radiotherapy treatments is proposed. Single-crystal europium-doped KBr samples were grown in a Bridgman furnace, and characterised using optical absorption techniques. An algorithm for the processing of the OSL signal…
Simultaneous interaction of low-energy ions and atomic hydrogen—a process named chemical sputtering—causes erosion of C:H surfaces which is significantly higher than the sum of the individual processes—chemical erosion due to atomic hydrogen alone and physical sputtering due to ions. Above that, this process occurs al…
A new ternary member, SbPS4, has been added to the growing inorganic nanotube family. This material naturally forms bundles of long, single wall nanotubes.
Single crystals of l -threonine have been grown from aqueous solutions of different pH values. The crystal grown from the solution of isoelectric pH (PI) was found to have the best linear and nonlinear optical properties. The optical quality of l -threonine was improved greatly in the case of the crystal grown at PI.…
The present report deals with the experimental observations of the thermally stimulated migration of charge carriers from trapping centres responsible for the main thermoluminescence (TL) peak at 450 K to a deep trap and, also, the optically stimulated transport of carriers from the deep trap to the main trap, which g…
Examples of the observation and analysis of dislocation cores and dislocation fine structure in metals and intermetallics using high resolution transmission electron microscopy are discussed. Specific examples include the 60 degrees dislocations in aluminum, a011 edge dislocations in NiAl, and screw dislocations in Ni…
The characteristics of thermoluminescence (TL) and optical stimulated luminescence (OSL) in undoped alpha-Al2O3 single crystals were studied. The TL glow curves of the crystal samples irradiated at various dose levels were measured by RisØ TL/OSL-DA-15B/C reader with U-340 or 7-59 filters at different heating rates. T…
Aluminate glasses are difficult to prepare as they do not contain traditional network formers, but they are promising materials for optical applications. The atomic structure of calcium aluminate glasses has been studied using several experimental techniques. The current study uses molecular dynamics to obtain a model…
We present a study of the light extraction from CdSe/ZnS core/shell colloidal quantum dot thin films deposited on quantum well InGaN/GaN photonic crystal structures. The two-dimensional photonic crystal defined by nanoimprint lithography is used to efficiently extract the guided light modes originating from both the q…
A brief review of X-ray topography--a nondestructive method for direct observation and characterization of defects in single crystals--is presented here. The origin and development of this characterization method and the different techniques derived from it are described. Emphasis is placed on synchrotron X-ray topogr…
A simple and robust position controller is proposed for a small planar three- degree-of-freedom robot arm actuated by two shape memory alloy (SMA) actuators and a servomotor. A simple model of the robot is used for controller development. The model combines robot kinematics and dynamics with crude models of SMA wire h…
ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTSynthesis of a Novel Poly(binaphthylene ether) Containing Trifluoromethyl Groups with a Low Dielectric ConstantKousuke Tsuchiya, Yuji Shibasaki, Masahiro Aoyagi, and Mitsuru UedaView Author Information Department of Organic and Polymeric Materials, Graduate School of Science an…
The flame and smoke retardance of polyvinyl chloride (PVC) is reviewed with emphasis on the chemical additives used to achieve acceptable fire properties in the principal application areas. Particular attention is given to the current ‘state-of-the-art’ of vinyl compounding in regard to the chemicals used. Representat…
Abstract Superparamagnetic nanoparticles of magnetite (Fe 3 O 4 ) 2 nm in size were produced by a co‐precipitation method. Superparamagnetic resonance (SPR) spectra at room temperature show a broad line with a Landé g ‐factor, g eff ≈ 2. It was observed that, as the temperature decreased to 24 K, the apparent resonanc…
Copolymer films of glycidyl methacrylate (GMA) with 2,2,3,3,4,4,5,5,6,6,7,7-dodecafluoroheptyl acrylate (DFHA) and with (perfluoroalkyl)ethyl methacrylate (PFEMA) were synthesized using initiated chemical vapor deposition (iCVD). By varying the inlet monomer feed ratios during iCVD process, the mole percentage of fluo…
Abstract A series of SiO 2 /PMMA composite particles with different morphologies were prepared by conventional emulsion polymerization by the aid of acid–base interaction between the silanol groups of unmodified silica particles and the amino groups of 4‐vinylpyridine. In this approach, no surface treatment for nanosi…