Materials Literature
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BaFe 11 CoO 19 hexaferrites were prepared by using a co-precipitation method and heat treatment. By changing the ion molar ratio of (Fe + Co)/Ba = ( x + 1)/1, we found a clear difference in the crystalline structural and magnetic properties. Particularly, the magnetic properties became optimal at x = 11 - 13 based on…
Bimodal microstructures with primary α-phase volume fractions ranging from 14.3% to 57.1% were gained in Ti-6Al-4V (Ti-64) alloy through annealed in two-phase region at various temperatures below the β-transus point. Then the influence of the primary α-phase volume fraction on the mechanical properties of Ti-64 were s…
We used X-ray diffraction, and Raman and photoluminescence (PL) spectroscopies to examine the structure and optical properties of molybdenum disulfide (MoS2) crystals grown by friction at the interface between two materials. MoS2 is produced chemically from molybdenum dithiocarbamates (MoDTC) in synthetic oil under sl…
INTRODUCTION: Clothing is an important aspect of nearly all human societies from performing social and cultural functions to indicating social status, a form of protection and a way for self-expression. It can help or hinder the ability to fulfil everyday activities and social roles and with the rising industry of wea…
Results of dielectric/electrical studies of onion‐like carbon (OLC)/polyurethane composite films in very broad frequency (20 Hz–3 THz) and temperature (26–300 K) ranges are presented. We show that the percolation threshold in these composites strictly depends on OLC aggregate size and is lower for composites having sm…
Abstract Recent findings in the conversion behavior of diesel oxidation catalysts (DOCs) show a strong dependence between performance and oxidation state of the catalyst. Furthermore, a slow and reversible change of catalyst oxidation state has been observed under cyclic temperature changes with realistic exhaust gas…
We present a technique for measuring molten polymer spreading dynamics with nanometer scale spatial resolution at elevated temperatures using atomic force microscopy (AFM). The experimental setup is used to measure the spreading dynamics of polystyrene droplets with 2 μm diameters at 115-175 °C on sapphire, silicon ox…
The problem of the oblique incidence of a low-frequency acoustic wave at the boundary of a vaporgas mixture with liquid drops or liquid with vapor-gas bubbles is considered. The dependences of the acoustic wave reflection coefficient on the initial fraction of vapor are obtained. The effect of phase transitions is stu…
A method of formation of a composite structure based on silver nanoparticles and a thin protective silicon film (Ag NPs /Si) is developed. Enhancement of the fluorescence and Raman scattering in cyaninedye molecules deposited onto the formed nanostructure is observed. The optical properties and morphology stability of…
Self-Heating effects are going to be of increasing significance in future nodes. Understanding self-heating measurement results and its accuracy is of vital importance. In this paper we show for the first time through measurement that the ambient temperature can affect self-heating measurement by up to 70%. Through a…
The temperature dependences of the heat capacity (C p ) and the thermal conductivity (κ) in the temperature range from 300 to 773 K of polycrystalline gadolinium sulfide samples (γ-GdS y ) with the deviation of the composition from the integer stoichiometric were studied. It was found that the thermal conductivity of…
The results of own studies in the field of nanophotochromism are generalized. Prospects of the development and application of photochromic nanoparticles based on spirocompounds (spiropyrans and spirooxazines), as well as diarylethenes in the form of aggregates; individual nanoparticles; and, especially, core‒shell typ…
Graphene with two dimensional structures is a very exceptional material, since it has advantage of being excellent conducting material. Few layer of graphene sheets (FLGS) have been successfully prepared by an electrochemical method directly from graphite using oxalic acid as electrolyte. The prepared few layer FLGS h…
Long-term (18 month) experiments were conducted, burying soft bodied organisms ( Artemia salina , Crustacea) in marine sediment. For the first time in experimental taphonomy, the mineralogical transformation of the sediment that accompanied the process of decomposition was correlated with the degree of preservation. T…
Abstract We present the results of studies on the structural, optical and piezoelectric properties of ZnO thin films deposited by ALD on flexible polyethylene naphthalate (PEN) substrates. Changes were observed in the optical transmission and crystal structures as the deposition temperature was varied. The electromech…
Carbon rods extracted from Zn-C primary battery waste was used as raw material for graphene oxide (GO) synthesis. The synthesis used a modified Hummers method by providing potassium permanganate-sulfuric acid as the oxidizing agent. XRD analysis confirms a significant change between the graphite waste pattern and the…
Due to its good physical and chemical properties, porous silicon (PSi) is very attractive to study. In this research, PSi has been fabricated on n-type Si (100) by the electrochemical anodization method. The electrolyte solution used was a mixture of HF (40%), ethanol (99%) and aquadest with volume ratio of 1:1:2, res…
Graphene, a two-dimensional material, has been studied and utilized for its excellent material properties. In reality, achieving a pure single-crystalline structure in graphene is difficult, so usually graphene may have various types of defects in it. Vacancies, Stone-Wales defects, and grain boundaries can drasticall…
Comparative analysis of electronic, magnetic, optical, and thermoelectric properties of CdFe 2 O 4 , calculated by employing PBEsol + mBJ has been done. The PBEsol reveals metallic nature, while TB-mBJ illustrates ferromagnetic semiconducting behavior. The reasons behind the origin of ferromagnetism are explored by ob…
The aim of this paper was to study the influence of partial substitution of Fe by Mn in the LaFe11.2xMnxCo0.7Si1.1 (where x 0.1, 0.2 and 0.3) alloys. Measurements revealed that a systematic increase of Mn in the alloy composition resulted in a decrease of the Curie temperature, which correlated with a decrease of the…