Materials Literature
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This article reports on research into the use of solid alkalis ( Na 2 CO 3 and K 2 CO 3 ) as activators to obtain hybrid cement (cement whose hydration generates a mix of C–A–S–H and (N,C)–A–S–H gels) from a blend of 20% clínker + 40% blast furnace slag + 40% metakaolin. More specifically, the study aimed to determine…
Protein design aims to identify new protein sequences of desirable structure and biological function. Most current de novo protein design methods rely on physics-based force fields to search for low free-energy states following Anfinsen's thermodynamic hypothesis. A major obstacle of such approaches is the inaccuracy…
Ab initio calculations of the complete unit cell of l -cysteine for both the orthorhombic and monoclinic polymorphs have been carried out. The results suggest the presence of a previously unrecognised, weak dihydrogen bond of a novel type: S–H···N–H in the gauche conformer of the monoclinic polymorph. Comparison of th…
In recent years, biosorption process has become an economic and eco-friendly alternative treatment technology in the water and wastewater industry. In this light, a number of biosorbents were developed and are successfully employed for treating various pollutants including metals, dyes, phenols, fluoride, and pharmace…
Surface-enhanced Raman scattering is the phenomenon where a huge increase of Raman scattering intensity from molecules situated close to the metal nanoobjects is observed. Our study is focused on the method of SERSactivation of silver nanoparticles and, in the future, the application of thus obtained SERS substrates f…
Este trabalho enfoca o desenvolvimento dos aços API para tubulações desde o aço API 5L X42, desenvolvido em 1948, através de laminação a quente seguida de tratamento térmico. Desde então foram feitos diferentes desenvolvimentos visando aumentar a resistência mecânica e a tenacidade, além de melhorar a soldabilidade. E…
Substituting silicon by transition metals in polymer‐derived ceramics ( PDC s) holds the potential for a new class of polymer‐derived ceramics for ultrahigh‐temperature structural applications. We present experiments that show that the solid solubility of HfO 2 extends to Hf / Si ratio of <0.22. The materials are synt…
Sand-rich (ESR) and sand-poor kaolin (ESP) facies from Ediki, Southwest (SW) Cameroon, have been mineralogically and geochemically characterised in order to elucidate on their emplacement and degree of kaolinization. The mineralogical assemblage comprised quartz, kaolinite, muscovite, microcline, goethite and anatase.…
This study concerns the preparation and characterization of wood polymer nanocomposites based on impregnation of styrene acrylonitrile co-polymer-nanoclay intercalating system in presence of glycidyl methacrylate (GMA), a cross linking agent, and vinyl trichloro silane (VTCS) as additives into Simul (Bombex ceiba, L.)…
Miniemulsification and emulsion/solvent evaporation techniques were combined to produce poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV) nanoparticles. Those nanoparticles were prepared with different PHBV molar masses and PHBV concentrations to verify their effect on the final particle size. Nanoparticles with an…
Abstract Background This paper describes the microencapsulation of linseed oil along with drier and corrosion inhibitor in polyurethane coating. Results Linseed oil along with drier and corrosion inhibitor was encapsulated in phenol formaldehyde microcapsules successfully by in situ polymerization process. These micro…
Ceramics of La x Sr 1− x Nb y Ti 1− y O 3 ( LSNT ) were synthesized under various reducing atmospheres. Covering the specimens with graphite carbon felt under an Ar‐gas flow during sintering drastically enhanced the electrical conductivity, σ. Ti K‐edge absorption spectra indicated the presence of Ti 3+ for heavily re…
When Griffith presented his famous theory of crack stability in elastic materials in the early twentieth century, he was unable to provide much detail on the structure of cracks at the nanometer level of resolution. Now, almost 100 years later, techniques such as transmission electron microscopy, atomic force microsco…
We report low-temperature synthesis of large-scale boron nitride nanosheets (BNNSs) and their applications for high-performance Schottky diode and gas sensor. Ten minutes of synthesis with a short-pulse-laser-produced plasma deposition technique yields a large amount of highly flat, transparent BNNSs. A basic reason f…
The main purpose of this paper is to investigate both the columnar to equiaxed transition and primary dendritic arm spacings of Al-3wt.%Si alloy during the horizontal directional solidification. The transient heat transfer coefficient at the metal-mold interface is calculated based on comparisons between the experimen…
In order to study the hot working behaviour of as-cast AZ80 magnesium alloy, a series of isothermal upsetting tests with height reduction of 60% were performed at the temperature range of 523-673 K and the strain rate range of 0.01-10 s-1 on a servo-hydraulic Gleeble-1500 machine simulator. Based on the regression ana…
We prepared a powder sample of edwardsite Cd2Cu3(SO4)2(OH)6 4H2O, which is a new candidate compound for the spin-1/2 kagome antiferromagnet, and studied its magnetic properties by magnetic susceptibility and heat capacity measurements. Edwardsite has a deformed kagome lattice with an average antiferromagnetic interact…
We present a novel synthesis of ligand-free colloidal silicon nanocrystals (Si-NCs) that exhibits efficient photoluminescence (PL) in a wide energy range (0.85–1.8 eV) overcoming the bulk Si band gap limitation (1.12 eV). The key technology to achieve the wide-range controllable PL is the formation of donor and accept…
We use our recently proposed accelerated dynamics algorithm (Tiwary & van de Walle, 2011) to calculate temperature and stress dependence of activation free energy for surface nucleation of dislocations in pristine Gold nanopillars under realistic loads. While maintaining fully atomistic resolution, we achieve the frac…
In this research, corrosion properties of water-based epoxy coating is improved by adding self-doped nano polyaniline (SPAni) synthesized using supercritical carbon dioxide (ScCO2) medium. The modified ScCO2-synthesized self-doped nano polyaniline (SPAni) using water-based polyamidoamine hardener results formation of…