Materials Literature
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The structure and adsorption properties (with respect to water vapor and nickel cations) of chitosan samples dehydrated by either lyophilization after precipitation with NaOH or Na 2 CO 3 or drying in air are investigated. IR spectroscopy and X-ray diffraction data testify that the lyophilization causes both changes i…
This paper reports a comparative study between yarn mass and yarn diameter measurement systems using a deferential capacitance tester and au optical coherent signal processing diameter tester respectively. A full description of the systems is presented along with their new contributions, namely 1 mm length samples ana…
Silver colloids and silver island films as fluorescence enhancement systems are the subject of this paper. Enhancement of fluorescence of molecules placed near metallic nanoparticles is a result of resonance interaction of exciting and emitted lights with surface plasmons. Two models explaining this phenomenon are pre…
The helical patterning onto fine copper pipes of 80–100 µm diameter was investigated for fabricating microcoil springs, and long microcoils of 5 mm length, 85–100 µm pitch and with a maximum aspect ratio of 60 were obtained when the patterned specimen pipes were wet-etched. The specimen pipes were coated with a positi…
Abstract Carbon nanotube (CNT) films were grown by microwave plasma-enhanced chemical vapor deposition process on four types of Si substrates: (i) mirror polished, (ii) catalyst patterned, (iii) mechanically polished having pits of varying size and shape, and (iv) electrochemically etched. Iron thin film was used as c…
The electric field dependence on the dielectric properties of the porous ceramics was studied theoretically. The dielectric constant of the porous ceramics under certain direct current (dc) bias field and the real strength electric field in the porous ceramics were given quantitatively. As the pore can share the elect…
A Ti–44Ni–6Fe (at. %) alloy was recently reported to exhibit a second order-like incommensurate–commensurate transformation. Whether or not the commensurate (C) phase and the R-phase in Ti–Ni alloys are the same phase has now been investigated. Transformation behaviour was examined in a series of Ti–(50 − x)Ni–xFe (at…
The shape memory behaviour of (Ni,Cu)-rich Ti–Ni–Cu thin films (Ti48.9Ni44.9Cu6.2, Ti48.5Ni40Cu11.5, Ti48.6Ni35.9Cu15.5, Ti48.3Ni28.4Cu23.3, Ti48.3Ni23.9Cu27.8 and Ti48.5Ni18Cu33.5) annealed at 773, 873 and 973 K for 1 h was investigated. The films with 6.2, 11.5–15.5 and 23.3–33.5 at% Cu showed a single-stage deforma…
The location of the Eu ion in the TiO 2 lattice was investigated as a function of sintering temperature using X-ray photoelectron spectroscopy (XPS), to clarify the role of the Eu ion in TiO 2 nanoparticles synthesized by the simple sol–gel method. The crystalline structure as well as the average crystallite size were…
The ability of marine luminescent bacteria to synthesize polyesters of hydroxycarboxylic acids (polyhydroxyalkanoates, PHA) as reserve macromolecules was studied. Twenty strains from the collection of the luminescent bacteria CCIBSO (WDSM839) of the Institute of Biophysics, Siberian Branch, Russian Academy of Sciences…
Microwave (MW) characteristics of a single bundle of single wall carbon nanotubes (SWCNTs) were obtained in the frequency range from 0.1 to 40 GHz. A tapered, sandglass shaped coplanar waveguide (CPW) structure was fabricated, and the input and output signal lines in the neck of the CPW were connected by a single bund…
This paper presents the non-linear analysis of a shape memory alloy (SMA) actuated fully compliant spatial parallel mechanism. A compliant mechanism made of SMA wires as its actuators and SMA pipe as its structural member that exploits both the shape memory and superelastic effects is proposed and its static analysis…
A simple synthesis of polymer core-dendrimer shell nanoparticles (NPs) in the 15-20-nm-diameter range is presented. Amine-terminated polypropyleneimine (PPI) dendrimers DAB-dendri-(NH(2))(4) and DAB-dendri-(NH(2))(16) (DAB4 and DAB16) are covalently attached to the surface of primary polystyrene-based NPs bearing reac…
Core/shell molecular particles, promising components of polymer nanocomposites, were synthesized by condensation of tetraethoxysilane (TEOS) in acetic acid at elevated temperature with subsequent blocking of reactive SiOH groups by trimethylsiloxy groups. Particle diameters ranged from 1 to 10 nm depending on the cond…
Three procedures (P) were applied to prepare silver nanoparticles on natural Ca-montmorillonite (MT). The intercalation of the montmorillonite with silver nitrate in aqueous solution (P1), the intercalation of the montmorillonite with silver nitrate in glycerol (P2) and the successive combination of both P1 and P2 met…
BaCe0.8Pr0.2O3- ceramic was synthesized by high temperature solid-state reaction. The structural characteristics and the phase purity of the crystal were determined using powder X-ray diffraction analysis. By using the methods of AC impedance spectroscopy, gas concentration cell and electrochemical pumping of hydrogen…
Structural and magnetic properties of SmCo5 thin films grown on glass substrates with a Cr underlayer were investigated. The nanocrystalline SmCo5 film with a (112¯0) texture exhibited high in-plane intrinsic coercivity up to 26.5 kOe and a large in-plane magnetic anisotropy. The crystallinity of the SmCo5 layer plays…
Composition and structure dependence of the shift in the position of the surface plasmon resonance band upon introduction of NaBH4 to aqueous solutions of gold and silver nanoparticles are presented. Silver and gold nanoalloys in different compositions were prepared by co-reduction of the corresponding salt mixtures u…
Single crystals of LuAG doped with Pr3+ions (0.2 mol%) are grown by the micro-pulling-down (mu-PD) method with an RF heating system. The as-grown crystals are confirmed to be of garnet-type structure with the space group of Ia3d (230). The emission-excitation spectra and luminescence decay kinetics are measured in the…
It is well known that organic enamels commonly used for the insulation of the wires used in the windings of low voltage electrical machines can suffer premature failures due to the degradation induced by partial discharges (PD) activity. Nanocomposite polymers can represent an innovative and powerful solution to this…