Materials Literature
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This paper reports the synthesis of a hyperbranched polymer by a cost-effective one-step copolymerization of A3 and B2 monomers, namely, triethanolamine and sebacoyl chloride, respectively, followed by methylation of tertiary amine groups. The structure of the hyperbranched polymer QTEAS as an efficient material for t…
A holographic liquid crystal polarization grating with a Fabry-Perot structure was developed. Because of its resonant structure, the device offers high levels of control of the diffraction properties of incident-polarized light beams, depending on the resonance conditions. The diffracted light beams are emitted in bot…
Different xPbO–(1–x)B2O3 glasses were prepared by conventional melting method. They were investigated by differential scanning calorimetry (DSC), Raman and IR spectroscopy. The glasse's structure and the PbO role to the formation of the borate units in the framework is investigated. The dielectric constant and dielect…
The properties of epitaxial silicene monolayers on Ag(111) at various levels of oxidation are determined through complementary density functional theory calculations and soft X-ray spectroscopy experiments. Our calculations indicate that moderate levels of oxidation do not cause a significant bandgap opening in the ep…
TiO2, ZnO and ZnO/TiO2 thin films have been prepared by radio frequency magnetron sputtering method under different temperatures. Their photo catalytic activities have been investigated. The structural of the thin films were characterized by X-ray diffraction and Raman spectroscopy. The photo catalytic activities of T…
Residues obtained from the sustainable harvest of heart of palm from pejibaye (Bactris gasipaes) palms can be managed to produce long and chopped fibers. These fibrous residues can be used to manufacture agglomerated panels and also serve as reinforcement in polymer–matrix composites. In this work, the characteristics…
In the present study, pulque (Agave cantala) fibers treated with acetic anhydride were grafted with styrene monomer by free radical graft copolymerization techniques. The grafted fibers were then characterized by Fourier transform infrared spectroscopy (FTIR), scanning electron microscope (SEM), thermogravimetric anal…
The photophysical properties of silicon semiconductor nanocrystals (SiNCs) are extremely sensitive to the presence of surface chemical defects, many of which are easily produced by oxidation under ambient conditions. The diversity of chemical structures of such defects and the lack of tools capable of probing individu…
A stripy pattern of continuous epitaxial growth of thin Au nanowires on plasmonic Cu3P platelets is reported. The obtained Au-Cu3P heterostructures retain their wide area interfacial heterojunction, which is typically not observed in metal-semiconductor heterostructures. This is performed by phosphine-mediated in situ…
A series of plate impact experiments on alumina was conducted using a light gas gun in order to further investigate Hugoniot elastic limit (HEL) and failure properties of alumina under shock compression. The velocity interferometer system for any reflector (VISAR) was used to record the rear-free surface velocity hist…
Systematic studies of the relaxation processes in nm-thick Er-doped SiO 2 /nc-Si multilayers have been conducted using cw photoluminescence and time-resolved photoluminescence. The size of the Si nanocrystals is determined by thickness of the Si layer. The distance between the Si nanocrystals and the Er ions in the Si…
Green cocoons in silkworm, Bombyx mori, are caused by flavonoids accumulation in the silk proteins, fibroin and sericin. Despite the economic value of natural green cocoon and medical value of flavonoids, there is limited understanding of the molecular mechanism regulating flavonoids uptake in silkworm, which is tight…
Abstract The physical properties of CsNi 2 Se 2 were characterized by electrical resistivity, magnetization and specific heat measurements. We found that the stoichiometric CsNi 2 Se 2 compound undergoes a superconducting transition at T c = 2.7 K. A large Sommerfeld coefficient (∼77.90 mJ/mol K −2 ) was obtained from…
This study reports on structural characterization of a series of glass‐like carbons obtained by pyrolysis of polyfurfuryl alcohol at 600, 800, 980, and 2700°C. The atomic scale structure of the prepared materials has been studied using wide‐angle X‐ray scattering technique. The acquired diffraction data were analyzed…
A molecular dynamics simulation was conducted to elucidate the conformation and dynamics of a glycolate ion (CH 2 (OH)COO – ) at the surface of a TiO 2 rutile crystal. The simulation was performed for the {001} and {110} planes of the crystal. The results indicate that, for both planes, the conformation and dynamics o…
The theory of hot electrons injection in carbon nanotubes (CNTs) where both dc electric field (Ez), and a quasi-static ac field exist simultaneously (i.e. when the frequency ω of ac field is much less than the scattering frequency v (ω⪡v or ωτ⪡1, v=τ−1) where τ is relaxation time) is studied. The investigation is done…
Abstract The properties of stacking faults in a single-crystal high-purity diamond with a very low dislocation density of <50 cm−2 and a very low impurity concentration of <0.1 ppm were investigated by synchrotron X-ray topography. We found stacking faults on the {111} plane and determined the fault vector f of the st…
Present topological study focuses on the formation mechanism of clusters of vacancies in graphenic layers. An original effect that explains both accumulation and self-healing of vacancies represents the original outcome of our investigation whose results, based on the long-range topological properties of the honeycomb…
Orthorhombic α″ phase often forms in Ti alloys through martensite transformation during quenching. Here, we report the formation of orthorhombic α″ phase in a low modulus β-Ti alloy during isothermal ageing. The coexists with α and ω phases, and remains stable for 120 h during ageing at 673 K. The phase is highly cohe…
Monolayer MoS2photodetectors are modeled and simulated by self-consistently solving diffusive transport equations in the presence of light illumination and carrier recombination with the 2-D Poisson equation. The simulated results indicate that very high photoresponsivity (PR) of ~1000 A/W observed in others' experime…