Materials Literature
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Mg72.5Zn26Y1.5 quasicrystal alloys were investigated under different solidification conditions. The specimens of Mg-Zn-Y alloys with cooling rates from 13.2K/s to 69.8K/s were gathered by a designed multi-channel temperature acquiring system and then the microstructures and phase evolution of the alloys were analyzed.…
We prepared breath figure patterns decorated with a statistical glycopolymer, (styrene- co -2-{[(D-glucosamin-2-N-yl)carbonyl]oxy}ethyl methacrylate, S-HEMAGl). The preparation of the glycopolymer occurs in one single step by using styrene and S-HEMAGl. Blends of this copolymer and high molecular weight polystyrene we…
Polymer dispersed liquid crystal (PDLC) devices were prepared by the method of polymerization induced phase separation. The transmittances and textures of the PDLC devices in OFF state and ON state were characterized by an ultraviolet-visible spectrometer and a polarized optical microscope, respectively. Our results d…
A phosphorus-containing dendrimer of up to four generations with phloroglucinol as a core unit was synthesised using a divergent growth method. A repetitive synthetic sequence of several types of reactions was performed by using P(O)Cl 3 , 3-hydroxybenzaldehyde, 4-hydroxybenzaldehyde and p-phenylenediamine for the syn…
The structure of a high-temperature austenitic 12Kh15N16M2TR steel, which is promising for manufacturing steam superheater tubes, is studied after long-term thermal holding under stress. The type, morphology, and matrix arrangement of excess-phase particles that form during thermal holding are found. The structure of…
X-ray photoelectron spectroscopy was used to characterize different polymer materials implanted with low energy Si + ions (E=30 keV, D= 1.10 17 cm −2 ). Two kinds of polymers were studied – ultra-high-molecular-weight poly-ethylene (UHMWPE), and poly-methyl-methacrylate (PMMA). The non-implanted polymer materials show…
We have determined the fatigue induced damage zone underneath the electrodes in bulk lead zirconate titanate ceramics by polishing off the fatigued electrodes. The results show that removal of material to different depths from the electrode yields different degrees of recovery of device properties depending on the cyc…
The paper focuses on the development of 2D continuous models for a theoretical prediction of dynamic properties of discrete microstructures. A new continualization procedure, which refers to nonlocal interactions between variables of the discrete media, is proposed and the corresponding continuous model is obtained. T…
We demonstrate a surface-enhanced Raman scattering substrate consisting of a closely spaced metal nanodome array fabricated on flexible plastic film. We used a low cost, large area replica molding process to produce a 2-dimensional periodic array of cylinders that is subsequently overcoated with SiO2and silver thin fi…
Dr. Charles W. Reimer dedicated almost 50 years of his life to the development and maintenance of the ANSP Diatom Herbarium. Today this is one of the largest diatom collections in the World. Its holdings include many historic and taxonomically important collections of prominent diatomists. Extensive collections of dia…
Materials showing a large magnetic field induced strain can potentially substitute giant magnetostrictive materials as well as piezoelectrical ceramics in actuating devices. However the magnetic shape memory alloys face several problems for an industrial application. Besides the well known brittleness the temperature-…
During the last few years, graphene has gained remarkable attention in the device community. Graphene transistors are evolving at a rapid pace and graphene-based devices are considered as an option for a post-Si electronics. To assess whether graphene can meet the high expectations or not, the properties and specifics…
Oscillation mechanism of carbon nanotubes (CNTs) under various external electric fields is investigated by performing first principles molecular dynamics (MD) calculations on closed and open-ended CNTs. From MD calculations we observe that, in addition to the strength of the induced dipole moment, temperature, chirali…
In this paper, SiBON powder was prepared by using water as the solvent; and TEOS, boric acid and melamine as raw materials. After nitrogenisation at 1200°C in N2 atmosphere, the chemical bond structure and micrographs of SiBON powder have been studied using X-ray diffraction (XRD), infrared (IR) spectroscopy and scann…
BN coated Ni nanocapsules were prepared by arc evaporating Ni-B amorphous alloy powders synthesized by a mechanochemical reaction, and their microstructure, surface component as well as electromagnetic properties (2-18 GHz) were investigated by means of high-resolution transmission electron microscopy, X-ray diffracti…
The influence of low-temperature nitrocementation of resurfaced crankshafts on the residual stress in the surface layers is studied experimentally. The possibility of improving the fatigue strength by nitro-cementation is demonstrated.
In the paper, a Ni-base composite cladding was cladded on the surface of QAl9-4 aluminum bronze by laser cladding technology, as well as its microstructure and tribological properties are studied. The results show that the microstructure of laser cladding is affected by solidification rate, and its wear behavior mainl…
A number of proteins can assemble into chiral structures that display strong nonlinear optical activity. For instance, proteins such as myosin and collagen exhibit intense second harmonic generation (SHG). A large number of experimental studies on the SHG of proteins have been conducted; however few predictive models…
Ion implantation proved to be a universal technique for producing waveguides in most optical materials. Tellurite glasses are used as hosts of rare-earth elements for the development of fibre and integrated optic amplifiers and lasers covering all the main telecommunication bands. Er 3+ - doped tellurite glasses are v…
ZnO nanopowders were prepared via solvothermal synthesis by using methanol, ethanol, isopropanol, n-butanol, n-hexanol and 1-octanol as the reaction medium. Effects of alcohol on the properties of the ZnO nanopowders were investigated. XRD, FSEM and UV-visible absorption spectroscopy were used to characterize ZnO nano…