Materials Literature
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A new chemical process to synthesize pure ZnO nanocrystal colloidal for bioimaging applications is reported. Zinc acetate dihydrate was dissolved and refluxed in a methanol solution at a low temperature (68degC) and ambient environment. Biocompatible surface capping agents were introduced to the synthesis process to c…
Three photosensitizers based on tris-(pentafluorophenyl)antimony corroles that differ in oxidation state and axial ligands, namely, (pyridine) Sb (III)-, (oxo) Sb (V)- and (difluoro) Sb (V) complexes, were studied by time-resolved electron paramagnetic resonance spectroscopy and laser flash photolysis. The magnetic an…
Irradiation is increasingly used nowadays to tailor the mechanical and electronic properties of carbon nanotubes. As the complete understanding of the response of nanotubes to irradiation is still lacking, we have implemented the kinetic Monte Carlo method with Bortz-Kalos-Lebowitz–algorithm in a simulation code which…
It has clearly been shown in the literature that the properties achieved by polymer clay nanocomposites are often related to their structures and to the states of dispersion of the silicate platelets in the polymer matrices. Unfortunately, up to date most techniques used in a standard procedure do not allow a correct…
The detection and localisation of Partial Discharge (PD) activities is gaining importance in maintaining operational transformers and diagnosing those which are faulty. Ultra-high-frequency (UHF) techniques have been applied successfully to detection of PD activities in HV transformers because of their sensitivity to…
Este trabalho avalia a utilização da cinza da casca de arroz como carga estrutural em poliamida 6 e poliamida 6.6. Estas matrizes poliméricas são importantes plásticos de engenharia com aplicações em várias áreas. Fez-se uma comparação das propriedades mecânicas de resistência à tração, resistência à flexão, resistênc…
A new cross‐linkable waterborne siloxane‐polyurethane dispersion (PEDA‐SiPU) was synthesized by incorporating the acrylate groups into the side chain of the polyurethane using the pentaerythritol diacrylate(PEDA) and introducing polysiloxane groups into the soft segment of the polyurethane using dihydroxybutyl‐termina…
Modern experimental studies of the temperature evolution at the surface of plastically deformed metals show that processes of energy accumulation and dissipation in the material are nonlinear even in the quasi-static case and obviously depend on the loading conditions as well as past history of deformation. Considerab…
Large single crystals of rubidium nickel hexahydrate Rb2Ni(SO4)2 · 6H2O (RNSH) of optical quality were grown for the first time. The atomic structure of RNSH crystals was refined. A comparative analysis of the crystal structures of (M 1+)2Ni(SO4)2 · 6H2O, where M 1+ is K, Rb, or Cs, was performed. The solubility curve…
Mollusc shell formation requires calcium (Ca ) and bicarbonate (CO3 −) ions, transported through the mantle via the hemolymph, and the secretion of an organic matrix that interacts with the mineral ions to form either the aragonite or calcite polymorph of calcium carbonate (CaCO3). The biomineralization process takes…
A study has been carried out on the effects of zinc and gadolinium concentration on the microstructure, properties and quench sensitivity of four alloys of similar composition to the commercial magnesium alloy Elektron 21. Increasing the gadolinium content of the alloys produced enhanced solid-solution strengthening w…
This study introduced, for the first time worldwide, molasses as an additive in papermaking. The introduction of molasses as an additive in papermaking resulted in paper composites with greater breaking length and remarkably higher water retention value (WRV), compared with paper that does not have molasses as an addi…
A large amount of calcium is required for mollusk biomineralization. Sarco/endoplasmic reticulum Ca2+-ATPase (SERCA) is a well-known protein with the function of sustaining the calcium homeostasis. How does it possibly function in the process of pearl oyster biomineralization? Three SERCA isoforms, namely PSERA, PSERB…
The steady state of plastic deformation is modelled by non-equilibrium thermodynamics theory. Based on energy conservation and constant entropy requirements at the steady state, the saturation dislocation density ρ is found to be determined by ρ= λ ϵ/( bv c ), where λ is a constant that depends on the material propert…
Specific features of the reaction of radical cations of 2,2′-azinobis(3-ethylbenzothiazoline-6-sulfonic acid) diammonium salt (ABTS + ) with mono-and multialyers of a polyphenol (tannic acid) and polycations (polyallylamine hydrochloride or dimethyldiallylammonium chloride), formed by layer-by-layer deposition, were s…
The structural features responsible for the high nonlinear optical activity of crystals of the hilgardite-like anhydrous bromo-borate Pb 2 [B 5 O 9 ]Br (space group Pnn 2) are analyzed with the use of data obtained from two (precision and conventional) single-crystal X-ray diffraction experiments. The electron-density…
Silica substrates were functionalized with a covalent 4-ClCH 2 C 6 H 4 SiCl 3 monolayer. Additional covalent bonding of the 5,10,15-tri-( p -dodecanoxyphenyl)-20-( p -hydroxyphenyl) copper porphyrin to the silylated substrates was further achieved. The optical properties of this robust monolayer system were studied at…
Er-doped amorphous silicon suboxide thin films were prepared by the coevaporation method. The Er concentration was varied from 0.4to6at.% and the samples were annealed at different temperatures up to 900°C. The samples exhibit a broad photoluminescence band in the visible range. Both energy and intensity of this band…
High Resolution Image Download MS PowerPoint Slide Time-resolved, in situ XANES studies of some cerium titanate pyrochlores and a fluorite-type bismuth-cerium oxide under reducing and oxidizing gas atmospheres reveal that reduction of cerium occurs at temperature below 500 °C in each of the materials. Cerium oxidation…
The effect of severe plastic deformation by high-pressure torsion (HPT) at room temperature and subsequent annealing on the magnetic properties and structural transformations of the melt-spun alloy (MSA) Nd9Fe85B6 is studied. The melt-spun ribbons in three structural states, such as nanocrystalline, mixed amorphous-na…