Papers by Keyword: EDX

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Authors: Nor Suhaida Shahabudin, Zainal Arifin Ahmad, Norazharuddin Shah Abdullah
Abstract: It is arguable that successful bone tissue engineering (BTE) protocols relies heavily on scaffolds (i.e., for mechanical support, aid for 3D arrangement, allowing good nutrient and waste transport etc.). In this study, the consequence of adding a bentonite (B) layer between alumina foam (AF) and its hydroxyapatite (HA) coat scaffold is scrutinized by spatial characterization measurement (e.g., porosity, pore size, pore interconnectivity and compressive strength). Other than work on the said hydroxyapatite-bentonite coated alumina foam (HABCAF), spatial characterization efforts were also done for AF and HA coated AF (HACAF) scaffolds. Initially, AF scaffold was fabricated via the foam impregnation technique (FIT). Polyurethane (PU) foam was chosen as a template to ensure controlled porosity and guided pore interconnectivity within the resulting scaffold. HACAF and HABCAF are produced using AF scaffold skeleton, coated with HA and B (for HABCAF only) slurries of different viscosities. After drying and sintering stages, these scaffolds were tested. The results from composite coating show an increase of 40% in strength with the same pore size of PU foam. The HABCAF exhibited the highest compressive strength besides showing good interconnectivity and cell pores sizes (i.e., up to >500 μm). These results suggest that addition of B presents an interesting route in the making of good quality scaffolds for BTE applications.
Authors: D. Prokoshkina, A.O. Rodin, V. Esin
Abstract: The temperature dependence of the bulk diffusion coefficient of Fe in Cu is determined by EDX in the temperature range from 923 to 1273 K, , m2/s. These results are different from that obtained earlier by radiotracer technique: activation energy is less by 30 kJ/mol and pre-exponential factor is 50 times smaller. Deviations from ideality of investigated solutions do not explain the differences; consequently, the thermodynamical factor would not responsible for such an effect. Fast grain boundary diffusion of Fe in Cu was not observed in the temperature range from 823 to 1073 K.
Authors: Chellasamy Panneerselvam, Kadarkarai Murugan, Duraisamy Amerasan
Abstract: Metallic nanoparticles have received great attention from chemists, physicists, biologists and engineers who wish to use them for the development of a new generation of nanodevices. In the present Communication, a completely “green” chemistry method for producing silver nanoparticles is introduced. The process is simple, environmentally benign, and quite efficient. Green nanoparticle synthesis has been achieved using environmentally acceptable plant extract and ecofriendly reducing and capping agents. In particular, silver nanoparticles are proved to have potential antibacterial, antifungal and antiplasmodial and antimicrobial properties. The present study was aimed to identify the antiplasmodial activity of green synthesised silver nanoparticles (AgNPs) using aqueous extract of plant Euphorbia hirta against P.falciparum. Nanoparticles are being used in many commercial applications. It was found that aqueous silver ions can be reduced by aqueous extract of plant to generate extremely stable silver nanoparticles in water. The bio-reduced silver nanoparticles were appropriately characterized by UV–vis spectrum, Scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDX) and X-ray diffraction (XRD). The formation of the AgNPs synthesized from the XRD spectrum compared with the standard confirmed spectrum of silver particles formed in the present experiments were in the form of nanocrystals, as evidenced by the peaks at 2θ values of =28.01°, 32.41°, 46.44°, 55.05° and 57.75°. The scanning electron micrograph (SEM) showed structures of spherical, cubic shape, and the size range was found to be 30–60 nm. The EDX spectra showed the purity of the material and the complete chemical composition of the synthesized AgNPs. The parasitic inhibition was dose-dependent. The synthesized AgNPs showed considerable antiplasmodial activity than the crude methanol and aqueous leaf extract of E.hirta. The maximum efficacy was
Authors: S.J. Kleinübing, Eric Guibal, Meuris Gurgel Carlos da Silva
Abstract: Fundamental investigation on adsorption of Cu2+ and Ni2+ ions on Sargassum sp. was performed in fixed-bed column. The Langmuir isotherm fitted well the biosorption equilibrium and the maximum Cu2+ and Ni2+ uptake capacities were 1.35 and 1.06 mmolg- 1, respectively. Mappings of copper and nickel in the algae surface using energy dispersive X-ray spectroscopy indicated a homogeneous distribution of Cu- and Niadsorbent sites. Fourier-transform infrared analysis revealed that the main chemical groups involved in the copper and nickel biosorption were carboxyl, ether, alcoholic, amino, and sulphonic groups.
Authors: Ling Zhi Sun, Xu Zhang
Abstract: Pristine and fluorinated multi-walled carbon nanotubes (MWCNTs) and single-walled carbon nanotubes (SWCNTs) were characterized using energy dispersive X-ray spectra (EDX) and X-ray photoelectron spectroscopy (XPS), respectively. The fluorine percentages of fluorinated multi-walled carbon nanotubes (F-MWCNTs) and fluorinated single-walled carbon nanotubes (F-SWCNTs) were 10.42% and 9.67% respectively by EDX. The absorption and de-absorption of fluorine properties were studied using high resolution C 1s and F 1s core level XPS and valence band spectra. The fluorine can be completely dissociated from F-MWCNTs, but partially dissociated from SWCNTs. There was 5.79% fluorine in atomic percent remaining associated with the F-SWCNTs when annealing the nanotubes to 500 °C measured by EDX. The results of F 1s core level XPS indicated that the binding energy of fluorine associated on SWCNTs was shifted from 687.0 eV to 688.3 eV after annealing the nanotubes to 500 °C. The results of valence band spectra showed that the binding energy of F 2p and F 2s shifted from 7.5 eV and 31.0 eV to 8.8 eV and 32.5 eV respectively in SWCNTS. However, the two peaks disappeared in annealed MWCNTs.
Authors: Maria Safonova, E. Mellikov, Valdek Mikli, Karin Kerm, Naidu Revathi, O. Volobujeva
Abstract: The aim of the current research was to study regularities of chemical bath deposition (CBD) of tin sulphide thin films as function of tin and sulphur concentrations in the solutions. SnS thin films were deposited onto Mo-, ITO-and TO-coated glass and onto borosilicate glass substrates at room temperature for 24 hours. The concentrations of sulphur and tin (ratio 1:1) in the deposition solution were varied from 0.01 M to 0.09 M. Films were characterized by SEM and Raman spectroscopy. The structuraly best tin mono-sulphide films with good adhesion to the substrate were deposited at concentration of consituents in solution 0.03M. The films deposited at concentration of 0.01M had non-uniform and incomplete coverage of the surface on all used substrates whereas at tin and sulphur concentrations of 0.05M and higher films were peeling off of the substrate.
Authors: Azyuni Aziz, Fatin Hana Naning, Syed Abdul Malik, Reza Zamiri
Abstract: Morphology of thin film poly (3-hexylthiophene) (P3HT) embedded with nanosphere-and nanorod-shape Zinc Oxide (ZnO) has been studied. We deposited the materials on quartz substrate using spin coating technique. The morphology of P3HT: ZnO thin films were investigated using Field Emission Scanning Electron Microscopy (FESEM), Energy-dispersive X-ray emission spectroscopy (EDX) and RAMAN Spectroscopy and compared. Based on size and shape of both ZnO, it can be seen that nanospheres in P3HT was found to be better than ZnO nanorods in P3HT.
Authors: Ahmad Razimi Mat Lazim, Mohd Kameil Abdul Hamid, Abd Rahim Abu Bakar
Abstract: Brake squeal has always been a major NVH problem to many car makers due to significant number of warranty claims. Brake squeal is a high frequency noise (above 1 kHz) emanating from car disc brakes that get excited due to one or more mechanisms such as mode coupling, stick-slip, hammering and sprag-slip. This paper attempts to investigate the effects of brake pad surface topography on squeal generation. Two pairs of a non-asbestos organic (NAO) brake pad will be tested on a brake dynamometer test rig. Surface topography of the brake pad will be analyzed through microscopic techniques using energy dispersive X-ray analysis (EDX), and optical microscope.
Authors: Robert Carl, Günter Völksch, Christian Rüssel
Abstract: The electrochemically induced nucleation and crystallization in a glass with the basic composition (mol%) 52.6 SiO2 · 18.7 Al2O3 · 14.3 MgO · 7.8 TiO2 · 4.7 B2O3 · 2.0 CaO leads to the formation of oriented mullite crystals. Electron microscopy techniques (energydispersive X-ray microanalysis and electron backscatter diffraction) were used to analyze the composition and the orientation of the crystals in the glassy matrix. The mean composition of the mullite crystals matches the formula Al4,65Ti0,11Si1,24O9,675. The electron backscatter diffraction pattern is consistent with data from the literature that needle-like mullite crystals are fast-growing parallel to the crystallographic c-axis [001]. The composition of the melt grown mullite crystals does not depend on the melting temperature in the range between 1230 °C and 1350 °C.
Authors: Andreea Borș, Melinda Székely, Oana Ponta, Vasile Iulian Antoniac
Abstract: The improvements in tooth-coloured filling materials generated more direct conservative techniques, making possible the achievement of optimal functional and aesthetic outcomes, in anterior and posterior teeth. Erosive acid-induced lesions of enamel or dentin often need restorative procedures. Nowadays, mostly aesthetic direct restoratives, which are adhesively fixed to the tooth surface are used for this purpose [1]. Several authors have concluded that direct restorations may lead to rehabilitation of eroded dentition in a less invasive manner [2], achieving adequate shaped, coloured and functional restorations. This in vitro study was carried out to evaluate, using micro energy-dispersive X-ray spectrometry (EDX) and scanning electron microscopy (SEM), the effects of an erosive challenge on different current direct restorative materials. It was aimed to provide information on aesthetic dental filling materials regarding their relative abilities to resist to erosive attack. The tested null hypothesis was that exposure to erosive solutions would influence surface degradation and chemical composition of the evaluated dental restoratives.
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