Materials Literature
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Structural data relative to spider silk fibers such as the flagelliform (Flag) silk are fundamental to understand the origin of their outstanding mechanical properties. However, due to its small diameter and limited availability, experimental data relative to the structure of the Flag silk are almost nonexistent. Rama…
Nd-doped yttrium aluminum garnet (NdYAG) is an important solid-state laser material due to Nd3+ interconfigurational transitions which result in intense infrared emission. This work shows that NdYAG crystals also emit visible radio-luminescence in response to exposure to beta particles due to other Nd3+ interconfigura…
The modulation of the fluorescence emission of a perylene dye between ON and OFF states was achieved with high efficiency by means of a diarylethene photochromic compound in an organogel medium. Fluorescent gels were prepared from a steroidal low molecular weight organogelator doped with the perylene fluorophore. The…
Well calibrated core–shell multifunctional nanoparticles for biomedical applications were synthesized by a multistep soft chemistry route. The core is composed of Gd(OH)CO3·H2O spheres prepared via a urea-based homogeneous precipitation technique, while the shell is a homogeneous thin silica layer embedded with the fl…
Hydrophilic Y3Al5O12 (YAG) and (YxGd1−x)3Al5O12 nanoparticles (NPs) doped with Ce3+ ions were synthesized by a solvothermal method and used for cell-imaging. The crystallite sizes and photoluminescence spectra were tuned by lanthanide ions (Gd3+, Ce3+) doping. Without any surface modification, the YAG:Ce NPs show good…
We report the application of dried Ag hydroxylamine‐reduced colloidal drops to surface‐enhanced (resonance) Raman scattering (SE(R)RS) study of biomolecules using Raman microspectroscopy. 5,10,15,20‐tetrakis(1‐methyl‐4‐pyridyl)porphyrin (TMPyP), amino acid tryptophan, and phospholipid 1,2‐distearoyl‐ sn ‐glycero‐3‐pho…
The high-pressure behavior of nanoporous rutile TiO2 was studied at room temperature using in situ synchrotron X-ray diffraction and Raman spectroscopy. It was found that the nanoporous rutile TiO2 starts to transform to the baddeleyite phase at a pressure of 10.8 GPa. The phase transition pressure is obviously differ…
The synthetically accessible borohydride complexes (C(5)Me(4)H)(2)Ln(THF)(BH(4)) and (C(5)Me(5))(2)Ln(THF)(BH(4)) (Ln = Sc, Y) were examined as precursors alternative to the heavily-used tetraphenylborate analogs, [(C(5)Me(4)H)(2)Ln][BPh(4)] and [(C(5)Me(5))(2)Ln][BPh(4)], employed in LnA(2)A'/M reduction reactions (A…
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.