Materials Literature
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The biosynthesis of gold nanoparticles using catclaw buttercup (Radix Ranunculi Ternati) and their stability have been reported in this paper. The aqueous catclaw buttercup was used as mild reducing agent for gold nanoparticles synthesis from HAuCl4 solutions. The influence of reaction time, temperature and mass ratio…
Surface dynamics is sometimes used to determine the rheological properties of soft materials. In typical data analyses, surface capillary waves are included without incorporating thermal noise. A phenomenological expression for the time-dependent power spectral density has been proposed to account for thermal noise an…
Abstract In this study, thiol–ene photocurable highly hydrophobic and oleophobic coatings were prepared and characterized. Trimethylolpropane tris(3‐mercaptopropionate) and triallyl 1,3,5‐triazine‐2,4,6(1H,3H,5H)‐trione were used for the preparation of the base formulation. Highly hydrophobic and oleophobic coatings w…
Neste trabalho foram desenvolvidos biocompósitos baseados em acetato de celulose e fibras curtas de Curauá tratadas com dióxido de carbono supercrítico. O tratamento das fibras resultou na extração parcial de lignina, sendo este um método interessante pois não resulta em rejeitos químicos. Duas séries de biocompósitos…
Sorption and desorption isotherms of four gelatin powder from different sources (Bovine B-225, Pig skin A-270, Fish FG-260 and Poultry PG-240) were determined at 25°C by using the DVS machine at wide relative humidity range (0% to 90%). Data were fitted with the GAB and Peleg models. The isotherms showed the character…
We carry out a molecular dynamics simulation of the first stages of constrained melting in crystalline polyethylene (PE). When heated, the crystal undergoes two structural phase transitions: from the orthorhombic (O) phase to the monoclinic (M) phase, and then to the columnar (C), quasi-hexagonal, phase. The M phase r…
The glass cooling rate during forming process has significant effect on the crystallization behavior and structural uniformity of Li2O-Al2O3-SiO2 (LAS) glass-ceramics. Finite element analysis indicated that the cooling rate of 10 mm thick glass was notably lower than that of 2 mm thick glass. The central temperature o…
Vanadium dioxide and tungsten-doped (W-doped) vanadium dioxide thin films deposited by aqueous Sol-Gel method were characterized with several different techniques (i.e. X-ray photoelectron spectroscope, atomic force microscope, X-ray diffraction), to determine their morphology and microstructure. Their metal-to-insula…
Abstract Favourable properties of polycarbonate have led to it replacing glass in many applications; however it does require a protective coating. Plasma deposited protective coatings of amorphous SiO x C y H z have, however, shown marginal adhesion to polycarbonate. This study has shown that plasma pre‐treatments usi…
Fundamental insights into the factors that control the properties and structure of gold nanoparticle (AuNP) based assemblies enable the design and construction of new materials. The dimensions (shape and size) and the optical properties of AuNP assemblies are affected by the electronic properties of the organic cross-…
The present work is intended to determine the catalytic activity of Mixed Oxide supported gold for aerobic oxidative dehydrogenation of amines to imines using Ceria as a main constituent of the each support. The model catalysts Au/CeO2:TiO2 Au/CeO2:SiO2, Au/CeO2:ZrO2 and Au/CeO2:Al2Os were prepared by deposition co-pr…
Abstract Low pressure plasma, generated in a radio frequency reactor under rotation, was utilized to modify the ability of granular substrates to adsorb volatile acid compounds. Carbon black granules were treated with NH 3 or allylamine containing feeds, while sepiolite granules were processed only in allylamine fed d…
X-ray diffraction studies of "tobermorite 10 Å", obtained through heating of the "anomalous" tobermorite 11 Å from N'Chwaning II mine (Kalahari Manganese Field, RSA), show the widespread structural disorder that arises during the transformation from tobermorite 11 Å to the 10 Å phase. The diffraction pattern of th…
Photoisomerization: N-phenylcarbazole-conjugated dimethyl 2,3-diethynylfumarate/maleate, E/Z-4, shows highly efficient and reversible visible-light E/Z photoisomerization (Φtotal=0.40) upon excitation with an intramolecular charge-transfer band. This photochromism induces switching of electronic communication between…
Charge redistribution at graphene/dielectric interfaces is predicated upon the relative positioning of the graphene Fermi level and the charge neutralization level of the dielectric. The authors present an angle-resolved near-edge x-ray absorption fine structure (NEXAFS) spectroscopy investigation of single-layered gr…
Stair-like metamagnetic transitions in the oxygen deficient La 0.5 Ca 0.5 MnO 3−δ perovskite are here for first time reported. This experimental fact sheds light on the knowledge of metamagnetic transition in anion deficient phase segregations systems. Actually, it is shown that controlled reduction of the oxygen cont…
Sierpinski-Kohlenstoff: Von makroporösem Carbiden abgeleitete Kohlenstoffmonolithe (DUT-38) mit einer hierarchischen Porenstruktur aus Mikro-, Meso- und Makroporen, einer großen spezifischen Oberfläche und einem großen Makroporenvolumen wurden hergestellt. Diese Materialien sind ideale Adsorbentien, da hohe Speicherka…
Abstract New tetrathiafulvalene (TTF)‐based electron‐donor molecules having 4,4′‐ and 2,2′‐biimidazole units ( 1 and 2 , respectively) as hydrogen bonding units were designed and synthesized. Cyclic voltammetry showed that both 1 and 2 possess strong electron‐donating abilities close to that of TTF with two‐stage reve…
Abstract The ring‐opening polymerization of glycidol at elevated temperatures is investigated. To improve the synthesis of dendritic polyether polyols, experiments are carried out without initiator to identify the influence of thermal side reactions. This results in a step‐growth polymerization caused by the spontaneo…
This work is related to an earlier publication [Schwaiger et al., Phys. Rev. Lett. 102, 163903 (2009)], where we demonstrated by means of fiber-based transmission measurements that rolled-up Ag-(In)GaAs multilayers represent three-dimensional metamaterials with a plasma edge which is tunable over the visible and near-…