Materials Literature
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In this work, we investigated the activity and selectivity of copper catalysts supported on zirconium oxide, obtained by different preparation methods, in the ethanol dehydrogenation reaction. From the ethanol, the most important products are ethyl acetate and acetaldehyde, because they have high valuable and are in t…
Abstract In this study, the fluids were composed with increased mole fractions of a mixture of molten salt: heavy metals 99 – 95 % Li20Sn80−1 – 5 % SFG-Pu, 99 – 95 % Li20Sn80−1 – 5 % SFG-PuF4, 99 – 95 % Li20Sn80−1 – 5 % SFG-PuO2. In this study, the effect on conversion of each isotope (238–242Pu) in spent fuel grade p…
The hydrogenated amorphous carbon films (a-C:H) were deposited on p-type Si (100) substrates at different thicknesses by radio frequency plasma enhanced chemical vapor deposition technique (rf-PECVD). Raman spectra display asymmetric diamond-like peaks, representative of the a-C:H films. The decrease of intensity ID/I…
Violet Sr–Al–O:Eu2+ phosphor particles were synthesized from a metal–ethylenediaminetetraacetic acid (EDTA) solution of Sr, Al, Eu, and particulate alumina via spray drying and sintering in a reducing atmosphere. The crystal structures and emission properties at 85–300 K were investigated. The composition of the viole…
During failure analysis of modern integrated circuits it might be necessary to carry out investigations, including both analysis of the die topology and the input of electrical signals on its contact pads. However, during access to the die the contact pads might be damaged due to different factors. In present work sev…
This paper presents results for films of CuAlxOy were deposited on the sapphire by reactive magnetron co-sputtering using DC applied to the high-purity Cu target,RF applied to the high-purity Al target.Copper aluminum oxide film (CuAlxOy) is transparent for infrared and conductive. The properties of the films are infl…
En la presente memoria de tesis doctoral se muestran y discuten los principales resultados de la investigacion realizada en micro- y nanoestructuras de ZnS. Este material, perteneciente a la familia de los semiconductores II-VI, presenta unas propiedades fisicas interesantes, entre las que destacan su banda de energia…
In this article, another thin film named white graphene is introduced, containing its properties, preparation and potential applications. White graphene, which has the same structure with graphene but quite different electrical properties, can be exfoliated from its layered crystal, hexagonal boron nitride. Here two p…
A study of copper (Cu) diffusion into silicon substrates through TaNx and Ta/graded Ta(N)/TaN multilayer diffusion barriers was investigated based on an experimental approach. TaNx and Ta/graded Ta(N)/TaN thin films were deposited by magnetron sputtering under argon (Ar) and Ar-nitrogen (N) plasma. The influence of th…
Optical, dielectric, thermal, physico-mechanical properties of new fluoro-containing alicyclic polyimides were investigated. High optical transparency in visible and UV ranges of the films with thickness 10-25 μm, which lower boundary was registered at 125-260 nm; as well as reflectivity index being 1.492-1.515 were r…
Paramagnetic relaxation in strongly anisotropic materials is analytically investigated in zero and weak constant magnetic fields. The objectives of the microscopic analytical investigation are (i) the weak-field electron paramagnetic resonance (EPR) linewidth and (ii) the electron spin relaxation rates given by a calo…
The conformational and dynamo-optical properties of a homologous series of polymethacrylate modified by first-generation Fréchet-type dendrons in the molecular mass range of 70–8800 kDa in organic solvents were studied by viscometry, isothermal diffusion, dynamic light scattering, and flow birefringence. The Mark-Kuhn…
Atmosphere water influence in the nanostructured silicon (NSS) was investigated by IR-spectroscopy and electron work function measurement. Long-term non-reversible dynamics of IR-spectra was found as a result of 100% humidity influence on the nanostructured silicon. It was indicated that air humidity affects on the wo…
Abstract Radioanalytical techniques using 131I and 82Br as tracer isotopes were applied to study the kinetics of iodide and bromide ion-isotopic exchange reactions taking place between the external labeled ionic solution and the resin surface. The results indicate low values of specific reaction rate (min−1), amount o…
A role of surface processes in the developing dynamics of electrochemical reactions between silicon and fluorine containing electrolytes during the pore formation in silicon matrix, which is required for the surface and volume nanostructuring technologies, is examined. The charge exchange processes between the media v…
This paper brings forward a solution for acquisition of good quality metallization layers on the polyimide substrate by magnetron deposition in vacuum environment. Different film type structures have been analyzed after refining and activation surface treatment operations. Positive effect was shown after the applicati…
Nowadays, some of the important problems in microelectronics technological node scaling down are related to interconnect delay, dynamic power consumption and crosstalk. This compels introduction and integration of new materials with low dielectric permittivity (low-k materials) as insulator in interconnects. One of su…
In the context of the DISPATMO project (study of the forecast of the risks of pollution related to the atmospheric dispersal of chemicals), risk studies linked to the fires and the explosions due to chemical storage were conducted. The purpose is to identify the combustion products of certain target compounds defined…
采用冷等静压、真空烧结的方法制备不同Cr含量的Ti-6Al-4V合金,通过金相观察、力学性能测试及SEM分析等方法研究Cr元素对Ti-6Al-4V合金显微组织与力学性能的影响。结果表明：添加Cr元素后,合金中并未出现化合物Ti Cr2,其组织是由（α＋β）相组成的魏氏组织。Cr的添加降低了合金的致密度,提高了其抗压强度,当Cr质量分数为4%时,合金的抗压强度达到1 855 MPa。Cr质量分数为1%、2%时,合金断裂形式为韧性断裂;Cr含量为3%、4%时,合金断裂形式为解理断裂。
Les nanocomposites polymere interessent depuis de nombreuses annees la communaute scientifique, du fait, notamment, de leurs bonnes proprietes mecaniques. Il est etabli que l'amelioration des proprietes mecaniques observees dans les nanocomposites est principalement due a des effets de structure (dispersion des partic…