Materials Literature
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Peripherally ethynylated carbazole-based core-modified porphyrins were synthesized by sequential metal-catalyzed coupling and annulation reactions. Experimental results and DFT calculations both confirm that the π-conjugated networks of the resulting porphyrins effectively delocalize over the entire macrocycle, includ…
The BiMnO3+δ phase has been prepared by mechanosynthesis, at ambient pressure and room temperature, as nanocrystalline powders. This oxide exhibits a metastable character, similar to those prepared by high-pressure and high-temperature methods, remaining stable up to 673 K. Nanostructured ceramic materials (92% densif…
Computer simulation studies are reported for the bulk phase behaviour of a colloidal platelet with square cross-sectional area. The platelets studied are composed of fused WCA spheres, have an approximate aspect ratio of 0.26 and are studied by means of molecular dynamics simulations at constant NpT and NVT. The plate…
A composite material with a high thermal conductivity is obtained by capillary infiltration of copper into a bed of diamond particles of 400 μm size, the particles having been pre-coated with tungsten. The measured thermal conductivity of the composite decreases from 910 to 480 W m−1 K−1 when the coating thickness is…
Rapid developments in nano-technology are likely to confer significant benefits on mankind. But, as with perhaps all new technologies, these benefits are likely to be accompanied by risks, perhaps by new risks. Nano-toxicology is developing in parallel with nano-technology and seeks to define the hazards and risks ass…
The wet-process phosphoric acid (WPPA) production is generally based on the use of sulfuric acid (H2SO4) for phosphate ore attack. One of the main issues encountered in this process is related to the uncontrolled formation of mineral deposits at sensitive steps. In the generated complex aqueous systems, the dissolved…
Polyolefin materials are of high relevance and interest for absorbers of solar thermal collectors with integrated overheating protection. In this work the effect of various black pigments (carbon black (CB) and carbon nanotubes (CNT)) on optical and mechanical properties of PP-RCT grades (Polypropylene-Random Copolyme…
A β,β-sp(3)-hybridized subphthalocyanine analogue, dibenzosubtriazachlorin, was synthesized, and its significantly split Q band absorptions in longer and shorter wavelength regions relative to those of subphthalocyanines were revealed. The effect of benzo-annulation to a subtriazachlorin structure on the position of t…
Lanthanide-doped upconversion (UC) nanocrystals display the property of emitting visible light following photoexcitation with near-infrared laser light, which has attracted much interest because of its great potential in biological fields. Recently, the coupling of UC nanocrystals with metal nanoparticles (NPs) has be…
New hybrid complexes based on covalent interaction between 5,10,15,20-tetrakis(4-aminophenyl)porphyrinatozinc(II) and 5,10,15,20-tetrakis(4-aminophenyl)porphyrinatotin(IV) chloride, and a Lindqvist-type polyoxometalate, Mo(6)O(19)(2-), were prepared. These new porphyrin-polyoxometalate hybrid materials were characteri…
Free-standing, three-dimensional (3D) indium-tin oxide monoliths with an interconnected pore structure have been prepared using a non-alkoxide preparative method. This approach aids in the formation of stable frameworks with a regular pore structure and considerable electrical conductivity.
Nanomagnet-selective supercaptors of heme-proteins (iron-porphyrin prosthetic group) based on mesoporous NiO and Fe(3)O(4) NPs were fabricated.
Two thermally stable naphthalene-substituted 2,3,4,5-tetraphenylsiloles, 1,1-dimethyl-2,5-bis[4-(naphthalen-1-yl)phenyl]-3,4-diphenylsilole (D-1-NpTPS) and 1,1-dimethyl-2,5-bis[4-(naphthalen-2-yl)phenyl]-3,4-diphenylsilole (D-2-NpTPS), have been synthesized and fully characterized. D-2-NpTPS shows redder absorption an…
The n-type Bi2Te2.9Se0.1 materials were synthesized by the direct fusion technique. The polycrystalline samples were fabricated by the uniaxial pressing of powders in spark plasma sintering (SPS) apparatus. The materials were subjected to the heat treatment in H2-Ar atmosphere at 470 K for 24 h. The influence of prepa…
Poly(lactic acid) was filled with 20 wt% of the three mineral fillers Mica, Zeolite, and Vansil, differing in the particle shape and surface area. Viscoelastic properties of unfilled and filled composites were investigated via dynamic mechanical analysis, while filler and fracture surface morphology of the composites…
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Ultrastable superparamagnetic core-shell nanoparticles of average diameter 80 nm have been fabricated via a simple one-pot method involving superparamagnetic iron oxide nanoparticles (SPIONs) core (∼50 nm in diameter) and lipid bilayer shell by high energy ultrasonication. The surface charges (zeta potentials) were me…
Al-doped ZnO (ZnO:Al) films were deposited at different substrate temperatures and H 2 /(H 2 +Ar) flow ratios by rf magnetron sputtering. The (002) preferred orientation is observed in all the deposited films; stress is decreased and crystallinity is improved for the films deposited at RT but they have no obvious chan…
A new non-centrosymmetric polyborate, Li5Rb2B7O14, has been synthesized. The structure of the title compound was solved by single-crystal X-ray diffraction analysis. The infinite three-dimensional structure of Li5Rb2B7O14 is constructed from bridged LiOn (n = 4, 5, 6) and RbO10 polyhedra with two kinds of one-dimensio…
Porous silica was synthesized via the sol-gel process using clay obtained locally from Ijero-Ekiti in Ekiti State, Nigeria and compared with silica synthesized under similar conditions from sodium metasilicate (Na 2 SiO 3 ) obtained comercially. The clay was initially refluxed with sodium hydroxide (NaOH) for 2 hours…