Materials Literature
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Tungsten borides are among a distinct class of transition-metal light-element compounds with superior mechanical properties that rival those of traditional superhard materials. An in-depth understanding of these compounds, however, has been impeded by uncertainties regarding their complex crystal structures. Here, we…
In conventional photostimulable storage phosphors, the optical information written by x-ray or ultraviolet irradiation is usually read out as a visible photostimulated luminescence (PSL) signal under the stimulation of a low-energy light with appropriate wavelength. Unlike the transient PSL, here we report a new optic…
To study charge-dependent interactions of nanoparticles (NPs) with biological media and NP uptake by cells, colloidal gold nanoparticles were modified with amphiphilic polymers to obtain NPs with identical physical properties except for the sign of the charge (negative/positive). This strategy enabled us to solely ass…
Solution-processable thin layer graphene is an intriguing nanomaterial with tremendous potential for electronic applications. In this work, we demonstrate that electrochemical exfoliation of graphite furnishes graphene sheets of high quality. The electrochemically exfoliated graphene (EG) contains a high yield (>80%)…
Many industrial catalysts involve nanoscale metal particles (typically 1-100 nm), and understanding their behavior at the molecular level is a major goal in heterogeneous catalyst research. However, conventional nanocatalysts have a nonuniform particle size distribution, while catalytic activity of nanoparticles is si…
The front cover picture shows (top left) a snapshot of a simulated box of water containing [AlW12O40]5– POM anions and their H3O+ counterions, forming local aggregates (zoomed). Indeed, the free energy profile ΔG(d) calculated as a function of the POM···POM distance in water (top right) displays a minimum for the “con…
Heavily deformed 18-carat yellow gold samples show a recrystallization peak at 700 K during the first heating. The mechanical loss spectrum of polycrystals shows a relaxation peak at about 780 K, which is absent in single crystals made from the same alloy. Stepwise deformation of a single crystal from 2 % to 10 % caus…
ABSTRACT Water‐soluble luminescent material was developed by introducing europium (Eu(III)) ions into the core of a star polymer. Living radical polymerization was used to obtain the star polymer. The strategy to introduce Eu(III) ions into the star polymer was studied using poly(methyl methacrylate) as an arm. The be…
It is known that there is lattice rotation around the particles after deformation, in a so-called Particle Deformation Zone (PDZ), which is thought to be important in randomizing the texture after recrystallization though Particle Stimulated Nucleation (PSN). However, the role of the local distribution of stored energ…
Recrystallization of rolled Zr single crystals is considered in comparison with analogous recrystallization processes in rolled coarse-grained iodide Zr and polycrystalline plates of commercially pure Zr. Diffractometric X-ray methods were used by texture and X-ray line profile measurements. The treatment of obtained…
We report recent research in our laboratory on the thermal stabilization of nanocrystalline binary alloys with ternary additions. Fe-Cr and Fe-Ni alloys with the ternary addition of Zr are studied. The thermal stability of these nanocrystalline alloys, prepared by mechanical alloying of powders, is studied by XRD, TEM…
Superplastic forming has been used to produce complex parts without local thinning. Cavitations that occur during this procedure can reduce the quality of products. In this paper, a model is proposed to predict void initiation in superplastic forming based on the study of dominant micro-mechanisms. For this purpose, a…
Post nondestructive analyses of an all-dielectric multilayer Fabry-Perot interference filter developed through a reactive electron beam deposition process have been carried out through numerical reverse engineering of transmission spectra, Rutherford backscattering spectroscopy and quartz crystal monitoring data to de…
Directed self-assembly (DSA) process of block copolymers (BCPs) has been considered as a candidate for sub-20nm contact patterning. In recent years the semiconductor manufacturers have been interested in use DSA in production. DSA is based on the intrinsic property of the BCPs which is phase-separation in the molecula…
Abstract We report the synthesis of monodisperse spherical Sn nanocrystals 9.0 nm in size by reduction of SnCl2 using tetrabutylammonium borohydride (TBBH, N(C4H9)4BH4) in a one-pot synthesis using a mixed solvent of oleylamine (OA, C18H35NH2) as a capping agent and tetrahydrofuran (THF). The size and shape of the Sn…
In the present work it is revealed by modified Potts model simulations and theoretical considerations that self-similarity is a feature of junction controlled grain growth as it can be found in nanocrystalline materials. To this aim the influence of the grain junctions – boundary faces, triple lines and quadruple poin…
A phenomenologically new recovery mechanism – triple junction motion is presented. This recovery mechanism is found to be the dominant one at low and medium temperatures in highly strained aluminum, which has a very fine microstructure, composed of lamellae with the thickness of a few hundred nanometers. Triple juncti…
Polypeptide α3 (21 residues), with three repeats of a seven-amino-acid sequence (LETLAKA)(3), forms an amphipathic α-helix and a long fibrous assembly. Here, we investigated the ability of α3-series polypeptides (with 14-42 residues) of various chain lengths to form α-helices and fibrous assemblies. Polypeptide α2 (14…
The static recrystallisation behaviour of two magnesium alloys after hot rolling have been examined. The alloys chosen for study were the conventional alloy AZ31, and an alloy containing the rare earth element Gadolinium. The recrystallisation kinetics were lower for the rare-earth alloy at low annealing temperatures,…
Abstract An experimental P – T ‐phase diagram was proposed for boron produced by pyrolysis of decaborane B 10 H 14 in the temperature range 1000–2100 K and pressure range 2–8 GPa. It was found that decaborane decomposes at temperatures above 1100–1400 K with a formation of either β‐rhombohedral boron at pressures of 2…