Materials Literature
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Investigation of the properties of two different silicate materials, namely MCM-41, with one-dimensional, cylindrical pores (4.04 nm diameter), and Na-magadiite, with a bidimensional, layered structure (1.67 nm between layers) was carried out. These materials may be used as sorbents, and their polarity is determinativ…
In this research, the activation energy of amorphous Sb9.1 Te20.1 Se70.8 crystallization was studied under isothermal conditions using a differential scanning calorimetric (DSC) technique. The activation energy for Sb9.1 Te20.1 Se70.8 crystallization was determined to be 124 ± 4 kJ mol-1. The Avrami exponent was obser…
Molybdenum sulfide (MoS2) was added to molten bronze consisting of Cu and Sn. Then, the machinability of the obtained bronze was examined from the viewpoints of cutting force, chip disposability and finished surface roughness. Copper sulfide (Cu2S)-dispersed bronze is produced by adding MoS2 to molten bronze. The disp…
The reduced pressure frozen mold casting process has been known as a recycling-based casting method with several advantages, such as improvement of the work environment, reduction of industrial waste and significant improvement of product yield. In this method, only water and silica sand were used to make mold, which…
Polyaniline (PANI) powder was prepared using ammonium persulfate (APS) as the oxidant with an APS to aniline (ANI) ratio of 1.5. The powder was then reduced by hydrazine or dedoped using an aqueous ammonium solution. The antioxidant properties of these polymers were investigated through their reaction with the stable…
Hot rolled specimens of low-manganese Fe-Mn-Si-Cr-Ni shape memory alloys, produced by classical and by powder metallurgy (CM and PM) with mechanical alloying, respectively, were analysed by tensile loadingunloading tests (TENS), by dilatometry (DIL), by X-ray diffraction (XRD) and scanning electron microscopy (SEM). S…
Cell volume of Isochrysis galbana (Prymneshiophyceae) was determined with a microscope before and after fixation during storage at 4 and 25°C. The shrinkage effect at 4°C was not detectable but at 25°C. It was described by the exponential equation; Y=0.797+0.224 exp (−0.074 X) for 2% formaldehyde and Y=0.849+0.150 exp…
Earlier developed micromechanics crystallographic model of SMA polycrystals has been modified by incorporating plastic deformation as additional deformation mechanism. It is assumed that dislocation slip proceeds in austenite and B19' martensite phases in parallel with the processes derived from B2-B19'martensitic tra…
GI coatings are covered by a very thin aluminum layer that precipitates after wiping. Anisotropic growing of zinc crystals during solidification induces a strong basal texture in GI coatings. Skin-pass induced changes in GI coating surface chemistry, crystallography and reactivity have been assessed. Local coating ana…
The Ti-6Al-4V alloy is a very attractive material for the fastener bolt of an aircraft because of its excellent combination of specific strength and corrosion resistance. However, poor workability and severe galling between work-piece and die material make it difficult to produce. The aim of the present work is to enh…
The current work applies the recently developed Dynamic-Tensile-Extrusion (Dyn-Ten-Ext) technique to polytetrafluoroethylene (PTFE) and polychlorotrifluoroethylene (PCTFE). Similar to the Taylor Impact Rod, Dynamic-Tensile-Extrusion is a strongly integrated test, probing a wide range of strain rates and stress states.…
Ba (Ti0.91Zr0.09) O3 ceramics doped with Bi2O3 and Li2O respectively were prepared by a solid phase reaction. The effect of A-site donor-acceptor doped on dielectric properties was investigated. Dielectric properties were measured from −30°C to 130°C at different frequencies. Relaxor behavior was observed with increas…
Silicon carbide SiC thanks to its many advantageous properties has found numerous applications in diverse areas of technology. In this regard, its nanosized forms often with novel properties have been the subject of intense research in recent years. The aim of this study was to investigate the binding of biologically…
The gravimetric and optical spectroscopic methods reveals that light irradiation with λ = 300–750 nm and intensity I = 6.9 × 10 14 –1.1 × 10 16 quanta cm −2 s −1 for τ = 1–160 min in atmospheric conditions significantly changes the absorption and reflection spectra and mass of aluminum films ( d = 2–200 nm). The kinet…
Electrochemical deposition of calcium phosphate (CAP) on valve metals such as Ta, Nb, and Zr, was performed by anodic oxidation with alternate polarity inversion at an applied 20 VDC. A saturated hydroxyapatite(HAP)-phosphoric acid solution (pH 3) was used as the electrolyte. FTIR, XRD, and XPS were employed to invest…
The temperature dependences of the dynamic tensile stresses on the chemical bonds of the skeleton of chain molecules and the bonds between molecules in poly(ethylene) and polyamide 6 crystals are measured using X-ray diffraction and Raman spectroscopy in the temperature range 5–500 K. The relations of the dynamic stre…
We report here that the incorporation of several disulfide bonds along poly(ethylene glycol) (PEG) gives temperature sensitivity, as well as biodegradability to PEG. To synthesize a PEG with temperature sensitivity in a physiologically important range (20-40 degrees C), PEGs with molecular masses of 400 and 600 Da wer…
This paper discusses the anomalous eddy current caused by magnetic domain wall movement. The anomalous eddy current due to the change of flux space harmonics distribution generated by domain wall movement is generally not affected by steel thickness, but by crystalline grain size. Then, if magnetic flux is concentrate…
We consider field emission from carbon nanotubes and other elongated nanostructures. An exact solution for the electrostatic field between a metallic hemi-ellipsoidal needle on a plate (as a cathode) and a flat anode are presented. The basic idea is to replace the cathode by a linearly charged thread in a uniform elec…
Decolorization of a dye reactive brilliant red K-2BP in aqueous solution by using hydrodynamic cavitation was investigated. Effects of operating parameters such as pressure, temperature, initial concentration of the dye, medium pH, and H2O2 addition on the decolorization of reactive brilliant red K-2BP were also discu…