Materials Literature
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Glioxal pode ser obtido a partir de biomassa (como da oxidação de lipídeos) e não é tóxico ou volátil, tendo sido por isso utilizado no presente trabalho como substituto de formaldeído na preparação de resina fenólica do tipo novolaca, sendo usado como catalisador o ácido oxálico, que também pode ser obtido de fontes…
Atomic structure of a Σ = 13, grain boundary in α-Al2O3 was directly observed by aberration-corrected Z-contrast scanning transmission electron microscopy. Combining observations from two orthogonal directions parallel to the grain boundary plane , the three-dimensional atomic configuration of the grain boundary core…
π-System, hab Acht! Die Titelumlagerung liefert das achterförmige Hexaphyrin(2.1.1.0.1.1) (siehe Schema), in dem im Zuge von Redoxreaktionen zwischen 30π- und 28π-Elektronensystemen die BIII-Zentren zwischen trigonaler und tetraedrischer Koordination wechseln. Das Hexaphyrin(2.1.1.0.1.1) kann nach dem Entfernen der BI…
We report step-by-step electrochemical design of two-dimensional (2D) Au nanocone arrays by using novel porous anodic alumina membranes with conical holes. The cones with desirable aspect ratios can be fabricated by using the PAA templates with different aspect ratios. The Au nanocone arrays show high potentials as SE…
Nutraceutical industrial residues are potential fillers to fabricate green or eco-friendly polymeric composite materials as they are, less costly and easily available. Attempts have been made to use turmeric spent (TS)—a nutraceutical industry waste with a high E-factor to improve need-based properties of plastics. A…
Two original dinuclear (Ln Yb, 3 and Ln Er, 4 ) and one trinuclear Cu II Ln III Cu II (Ln Gd, 5) complexes derived from a polydentate non symmetrical Schiff base ligand H 2 L have been prepared. The ligand possesses two functions (phenol and oxime) able to coordinate the Ln ions, but structural studies (X-ray diffract…
Perovskite oxide materials display a wide spectrum of functional properties, including switchable polarization, piezoelectricity, pyroelectricity, and non-linear dielectric behavior. These properties are indispensable for application in electronic devices such as non-volatile memories, sensors, microactuators, infrare…
The thermal and rheological properties of clay-containing poly[(butylene succinate)-co-adipate] (PBSA) nanocomposites are reported. The nanocomposites of PBSA with various weight percentages of organically modified montmorillonite (OMMT) loadings have been prepared by melt-mixing in a batch-mixer. The melting and crys…
Ti-30Nb-xZr and Ti-30Ta-xNb alloys have been investigated using various methods of surface nanotube formation. Ternary Ti-30Nb-xZr (x = 3 and 15 wt%) and Ti-30Ta-xNb (x = 3 and 15 wt%) alloys were prepared by using high-purity sponge Ti (Grade 4, G&S Titanium, USA), Ta, Zr and Nb spheres. The two groups of ternary Ti…
The first to fourth generation (G1-G4) of sectorial poly(amido amine) (PAMAM) dendrimers with ethanolamine core and amino terminals are synthesized by a divergent route. Blue fluorescence emission from these dendrimers is observed. It is found that there is a remarkable difference in the fluorescence behavior for thes…
Poly(3-hydroxybutyrate-co-4-hydroxybutyrate) P(3HB-co-4HB) biopolymer was subjected to a depyrogenation treatment followed by blending with vitamin E (P(3HB-co-4HB)/Vit E blend), collagen (Col blend) or both (P(3HB-co-4HB)/Vit E/Col hybrid blend) to improve its biological performance. The cytocompatibility and pro-inf…
ZnO nanorods were synthesized by using a simple two-step hydrothermal approach. The nanorod diameter ranged from 40 to 60 nm and their length was about 2 μm. X-ray diffraction shows good crystalline quality with an axial alignment of the nanorods along the wurtzite c axis. Raman and visible photoluminescence demonstra…
Computational and theoretical efforts towards a quantitative understanding of biological as well as synthetic bioinspired and biomimetic materials (e.g., DNA, proteins, mineralized structures as well as soft tissues), their assembly, properties, and interaction with their environment has evolved into an Delivered by I…
The two heteropolyacids H(3)PW(12)O(40) and H(3)PMo(12)O(40), and their homologous salts (NH(4))(3)PW(12)O(40), and (NH(4))(3)PMo(12)O(40) were prepared and tested in the cationic polymerization of styrene. The results showed that the heteropolytungstates were more reactive than the heteropolymolybdates. It has been f…
Abstract Precipitated silica (SiO 2 ) is industrially produced by mixing a silicate solution with acid in a semi‐batch process. Polycondensation of monomeric silica leads to the formation of particles which aggregate and eventually form a particulate gel. However, this is instantly fragmented by the mechanical energy…
Glass systems of composition xAg2SO4–20Ag2O–(80−x) [0.50 B2O3–0.50 TeO2], where x = 5, 10, 15, 20, 25 and 30 mol% have been prepared by melt-quenching technique. Frequency- and temperature-dependent conductivity measurements have been carried out in the frequency range 10 Hz to 10 MHz and at a temperature range of 303…
The improved values of the bond-valence parameters for the Sb(3+)/O(2-) ion pair, r(0) = 1.927 A and b = 0.446 A, have been deduced from the crystal structures of the alpha and beta polymorphs of Sb(2)O(3) and from the set of precisely determined complex structures containing [Sb(3+)O(n)] coordination shells.
Abstract Ceramic matrix composites (CMCs) based on zirconium diboride (ZrB 2 ) reinforced by vapor grown carbon nanofibers are a potential constituent of reusable thermal protection systems. A manufacturing procedure was devised that involved the fabrication of thin films by tape casting to obtain a layer that could b…
The semiconductor zinc oxide (ZnO) has been widely used because it presents exclusive novel physical and chemical properties at the nanometer scale. In this work, ZnO nanocrystals were synthesized via solochemical processing in a few hours without any subsequent treatment. ZnCl2 and NaOH were adopted as synthesis prec…
Theoretical calculations of the electron-localization function show that, at the volumes of the two CaO phases (rocksalt and CsCl type), the parent Ca structures (fcc: face-centred cubic and sc: simple cubic, respectively) exhibit charge concentration zones which coincide with the positions occupied by the O atoms in…