Materials Literature
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This paper presents the investigation of dry fibers in thick composites. Dry fibers can be defined as lack of epoxy in localized regions. These local regions act as potential defects in thick composites under compressive loads and act as an initiation point for defects such as matrix cracking and delamination. Detecti…
PbTiO3 (PT) sol gel processed powders doped with lanthanum (PLT14) and cerium (PLCexT14, x = 1; 3; 6; 10) were characterized by XRD and Raman spectroscopy. The samples crystallize in a pure perovskite phase at temperatures smaller than those reported for the same compounds prepared by other conventional methods. The e…
We pattern a metal film into different nanostructures to investigate the influence of surface plasmonic modes and the effects on the sensitivity to the change of environment's refractive indexes. We find out that 1-D nanoslit array structures and grating structures have much higher sensitivity than 2-D nanoisland arra…
The extraordinary magnetoresistance (EMR) in metal-semiconductor hybrid structures depends on the orbital motion of carriers in an external magnetic field, and the remarkably high magnetoresistance response observed suggests that the geometry of the metallic inclusion can be optimized to significantly enhance the EMR.…
Cadmium sulphide (CdS) thin films were deposited onto glass substrates by the chemical bath deposition (CBD) technique. Aqueous baths of cadmium sulphate and thiourea were used as sources of cadmium (Cd+2) and sulphur (S−2) ions, respectively. The influence of the varied bath temperature from 65°C to 85°C in a step of…
L’avènement des nanotechnologies a ouvert de vastes perspectives pour le développement de nouveaux produits et applications dans de nombreux secteurs industriels et de la consommation. À l’instar d’autres secteurs, les nanotechnologies ont permis de révolutionner la médecine humaine, vétérinaire, la chaîne alimentaire…
Nonisosceles bowtie nanoantennas with central symmetry are studied numerically. Compared with the axial symmetry, the central symmetry suppresses the mode splitting and gap enhancement by coupling and interferences of four edges.
In this paper, we designed a EM wave absorber in transparent type at V-band for countermeasure EMC problems. Firstly, we suggested the structure of a transparent-type EM wave absorber consisting of polycarbonate (spacer) which are used for support fixture and two TiO2 films layers (transparent resistive sheets) which…
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Nanostructural, multifunctional, multiferroic materials possessing strong magnetoelectric coupling, open exciting multitudinous ways for designing future spintronic and data storage device applications. Pure and 15% Dy-doped BiFeO3 multiferroic nanoparticles (NPs) with size 24 and 20 nm respectively have been synthesi…
We shall discuss results of a series of synchrotron x-ray scattering studies to understand the ordering of nanostructured materials formed at interfaces. In particular we shall discuss formation of germanium quantum-dots at the MBE grown silicon-germanium super-lattice structure and reversible crystallization of monol…
Within the Boltzmann equation formalism we evaluate the transport relaxation time of Dirac surface states (SSs) in the typical topological insulator(TI) Bi2Se3 due to the phonon scattering. We find that although the back-scattering of the SSs in TIs is strictly forbidden, the in-plane scattering between SSs in 3-dimen…
Fatigue stiffness degradation behaviour of woven composite π joint subjected to tensile-tensile cycle loading is studied. Because of the complex structural configuration of woven composite π joints and a variety of failure modes, there exhibited four stiffness degradation modes in fatigue test. For example, stable sli…
Several narrow alpha resonant 16O states were detected through the 12C(6Li,d) reaction, in the range of 12 to 17 MeV of excitation energy. The reaction was measured at a bombarding energy of 25.5 MeV employing the São Paulo Pelletron-Enge-Spectrograph facility and the nuclear emulsion technique. Experimental angular d…
Graphene (G), a two-dimensional crystal of carbon atoms arranged in the honeycomb structure, shows extraordinary physical properties such as outstanding electronic mobility, higher than silicon or copper, it is one of the strongest materials found in nature, only comparable to diamond, and at the same time one of the…
Recent advances in mechanics and materials provide routes to integrated circuits that offer the electrical properties of conventional, rigid wafer-based technologies but with the ability to be stretched, compressed, twisted, bent and deformed into arbitrary, curvilinear shapes. This paper summarizes developments in th…
In the present study spin-glass-like ordering has been observed in the spinel Co-Zn ferrite. DC magnetizations display divergence at low temperature, which indicates a frozen state with the freezing temperature of Tf=180 K. Frequency dependence of AC susceptibility measurement was performed on series of above sample.…
This paper presents our latest experimental findings of impurity scavenging from powder metallurgy (PM) titanium alloys by rare earth elements, based on in-situ heating synchrotron radiation and detailed transmission electron microscopy (TEM) studies. Yttrium was selected as a rare earth addition in the form of yttriu…
The effect of moving heat source on the flow structure in gravity-driven thin liquid film is studied. The 2-D steady-state conjugated hydrodynamic and thermal problem is solved in long-wave approximation. The flow structures in different regimes are compared: from the regime of flow along vertical substrate with resti…
Nanoscience is a new emerging, meaningful, and useful research branch. The important part of nanoscience to me, as well as to many other chemists, is that nanoscience and nanotechnology can help us understand and resolve issues, especially in interfacial area, which could not be settled using traditional chemical/phys…