Materials Literature
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We demonstrated diamond processing using a variable pressure scanning electron microscope. Dents were formed in diamond by electron beam irradiation in air, nitrogen gas, oxygen gas, and water vapor. The processing in oxygen atmosphere showed the highest efficiency. The processing mechanism can be explained in terms o…
The stresses and the textures of electroplated copper films were studied using the X-ray diffraction analysis. The results show that the stresses in the films are always tensile. The films have (110) fiber texture at different thickness from 8 to 60 μm. From strain energy minimization point of view, the grains with (1…
Abstract The electronic band structure of NiO in the ferromagnetic state is calculated using the B3LYP hybrid density functional, the Hartree–Fock (HF) method, and the GW approximation (GWA) with dielectric functions constructed using either B3LYP or HF wave functions and energy eigenvalues. The band structure from th…
A porous material having near zero thermal expansion (NZTE) around room temperature was developed. This material was prepared by sintering a mixture of SiC, vitrified bonding material (VBM) and LiAlSiO4 at 850°C. LiAlSiO4 was added in different weight proportions, and it was found that a change in the amount of LiAlSi…
Carbon-carbon composites (CCCs) have extremely high thermal stability and shock resistance and find use in aerospace applications and aircraft disk brakes. The processing of CCCs can be divided into three stages: curing of precursor resin/fiber-reinforced-laminate; carbonization; and densification. During carbonizatio…
A new approach for the fabrication of n-type porous silicon layer is proposed. A hole-rich p-layer is arranged underneath the n-layer, and the np-junction is under forward biased condition in the etching process. Therefore sufficient holes can drift straight-upward and pass across the np-junction from p-region to n-re…
The effects of ultrasonic oscillations on properties and structure of extruded high‐density polyethylene (HDPE) were studied. The experimental results show that ultrasonic oscillations can improve the surface appearance of the HDPE extrudates; increase the productivity of the HDPE extrudates; and decrease the die pres…
Magnetism of intermetallic compounds SmFe2, SmFe3, Sm6Fe23, and SmFe7 were studied in detail using single crystals and the use of these materials has been discussed. SmFe2 and Sm6Fe23 have cubic magnetocrystalline anisotropy and the easy axis of magnetization in the [111] direction. SmFe2 has giant negative magnetostr…
According to the design rules for Functionally Gradient Materials (FGM) with high thermal shock resistance proposed in the previous work of the author, an Al2O3-(W, Ti)C FGM ceramic tool material with symmetrically laminated structure was fabricated by using hot-pressing technique. The cutting performance, failure mod…
An effect of magnetic field on the martensitic transformation (MT) temperature in ferromagnetic shape memory Ni49.4Mn27.7Ga22.9 single crystal with the MT temperature 285 K is studied by measuring and theoretical treatment of the magnetization versus temperature dependencies in a wide range of the high magnetic fields…
Tissue engineering of oropharyngeal mucosa is rendered complex by the fact that oropharyngeal keratinocytes are difficult to culture in the long term and do not grow well after several subcultivations. Three populations of oropharyngeal keratinocytes were isolated by a method based on different levels of beta(1)-integ…
The BWA (Bertaut-Warren-Averbach) technique for the measurement of the mean crystallite thickness and thickness distributions of phyllosilicates was applied to a set of kaolin and bentonite minerals. Six samples of kaolinitic clays, one sample of halloysite, and five bentonite samples from selected Serbian deposits we…
In order to model the mobility of the postulated disrupted core in a core disruptive accident of a liquid metal faster reactor and to provide data for the verification of a reactor safety analysis code (SIMMER-III) a series of experiments was performed to simulate the behavior of a solid particle bed in a liquid pool…
We demonstrate that the conductivity of conjugated poly[2-methoxy-5-(2′-ethylhexyloxy)-p-phenylene vinylene] (MEH-PPV) can be configured by changing the dopant concentrations in the polymer electrochemically when an external electric field is applied. Two types of switchable devices were fabricated based on the dopant…
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We observe premelting at grain boundaries and dislocations within bulk colloidal crystals using video microscopy. The crystals are 3D thermally responsive microgel colloidal structures. Particle tracking reveals increased disorder in crystalline regions bordering defects.
The QUENCH experiments are to investigate the hydrogen source term resulting from the water injection into an uncovered core of a Light-Water Reactor (LWR). The QUENCH test bundle consists of 21 fuel rod simulators with a total length of approximately 2.5 m. Experiment QUENCH-10 on air ingress conducted at the Karlsru…
Ti3AlC2/TiC-Al2O3 composite was synthesized by a combustion reaction in TiO2-Al-C system. The effect of the compositions in raw materials on the products was investigated. Ti3AlC2/TiC-Al2O3 composite was obtained at the molar ratio of TiO2:Al:C=3.0:5.0-5.1:1.8-2.0. The reaction path for the 3TiO2-5Al-2C system was pro…
Materials with a negative thermal expansion coefficient contract when heated and expand when cooled. This paper reviews mechanisms of how this unusual property can be achieved at the molecular and macroscopic level. Some applications of this unusual property are also discussed.
Hydroxyvanadinite, Pb(10)(VO(4))(6)(OH)(2), was prepared by the co-precipitation method and analyzed by X-ray absorption spectroscopy (XANES, EXAFS), infrared spectroscopy, Raman scattering and X-ray diffraction (XRD). The results showed that the structure is very similar to that of vanadinite, Pb(10)(VO(4))(6)Cl(2),…