Materials Literature
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The Effect of Mn incorporation into perovskite B-site lattice of SrTiO3 ceramics on structural and low frequency dielectric properties is studied in this work. Lattice parameter and grain size decreases with Mn content increasing. Mn doping reduces dielectric permittivity value and drives the system away from ferroele…
With the emergence of commercial hyper-branched (HB) and dendritic polymers, having a three-dimensional (3D) morphology with high peripheral functionality, new opportunities have been created for formulating dental adhesives and composites with enhanced mechanical and physical properties. The objective of the present…
Dextran-polyethylene glycol (PEG) conjugates were synthesized by activating dextran hydroxy groups with carbonyldiimidazole, introducing amino groups by attaching ethylenediamine, and reacting amino groups with a succinimidyl-activated derivative of PEG. Conjugates with an average of 12 and 21 PEG (5 kDa) residues per…
This analysis was conducted to investigate the influence that dispersion in crystal grain sizes has upon the yield behavior of nanocrystalline materials. In the model proposed for this purpose, the distribution of crystal grains was expressed in a log-normal manner. It was assumed that the yield stress of each crystal…
A vanadia-titania mesoporous xerogel (10.5 wt% V(2)O(5)) was prepared from chloride precursors using a one-step non-hydrolytic sol-gel route and subsequent drying at ambient pressure; after calcination at 773 K for 5 h no crystalline V(2)O(5) was detected and the resulting mixed oxide exhibited remarkable activity in…
A processable polyborazine was synthesised by an original method under mild conditions and then converted into high performances boron nitride fibres.
The ground state electronic properties of metal-exchanged Preyssler heteropolyoxoanions [M(n+)P(5)W(30)O(110)](n-15), in which the encapsulated M(n+) ions are the spherical, diamagnetic ions Na(+), Ca(2+), Sr(2+), Y(3+), La(3+) and Th(4+), are studied using a combination of electrochemical, optical, and NMR experiment…
Electronic phase separation is increasingly getting recognized as a phenomenon of importance in understanding the magnetic and electron transport properties of transition metal oxides. The phenomenon dominates the rare-earth manganates of the formula Ln(1-x)A(x)MnO(3)(Ln = rare earth and A = alkaline earth) which exhi…
A comprehensive understanding of the design, synthesis, characterization, and properties of boron carbonitride nanotubes (BCN) is presented in this review. Distinctive structural and electronic properties are revealed in theoretical studies of the BCN nanotubes and compared with the properties of carbon nanotubes. In…
Hexadehydro[12]annulenes annelated with one or two TTF units have been synthesized to investigate their pi-amphoteric properties based on the TTF and [12]annulene moieties; these compounds show multi-redox potentials, solvatochromism and the formation of large sandwich complexes.
Sonication of nanoparticle suspensions confined within aqueous droplets of drug molecules in toluene produces drug-loaded silica or titania porous microspheres with complex morphology and storage/release properties.
An octanuclear copper(II) complex possessing a dimer-of-tetramers structure self-assembles from a binuclear oxamatocopper(II) metallacryptand of the meso-helicate type; its magnetic behaviour is consistent with its unique double-propeller molecular topology.
BACKGROUND: Accurate measurement of the mechanical properties of skin has numerous implications in surgical repair, dermal disorders and the diagnosis and treatment of trauma to the skin. Investigation of facial wrinkle formation, as well as research in the areas of skin aging and cosmetic product assessment can also…
This study reveals self-assembly patterns of the tetra(4-pyridyl), tetra(4-hydroxyphenyl) and tetra(4-carboxyphenyl) zinc porphyrin moieties when reacted with a hexamethylenetetramine ligand, forming 1 ∶ 1 five-coordinate, 1 ∶ 2 and 1 ∶ 2 six-coordinate complexes, respectively. Detailed structural characterization of…
The undoped ZnO films were grown on silicon (001) substrates by radio frequency magnetron sputtering. The dependence of defect formation and photoluminescence (PL) of ZnO films on the annealing temperature and oxygen mole ratio (OMR) were investigated using X-ray diffraction and PL spectra. A sharp ZnO (002) peak with…
We synthesized dialkylterthiophene derivatives ω-substituted with cyclohexylethyl moiety, which exhibit smectic mesophases at room temperature, and investigated their charge carrier transport properties. In particular, trans-pentylcyclohexylethyl-propylterthiophene (3-TTP-C2CH-5) held SmB phase at room temperature. Fu…
Fourier transform mid-IR and Raman spectroscopies were extensively used to examine cation/polymer and cation/cross-link interactions, as well as hydrogen bonding, in Eu3+-doped sol–gel derived organic/inorganic materials (monourethanesils). The hybrid framework of these xerogels contains short methyl end capped polyet…
The AZEP (Advanced Zero Emissions Power Plant) project addresses the development of a novel “zero emissions,” gas turbine-based, power generation process to reduce CO2 emissions. Preliminary calculations indicate the attractiveness of this concept in comparison to conventional tail-end CO2 capture. Key to achieving th…
Homogeneous electron transfer reactions of the Cu(II) complexes of 5,10,15,20-tetraphenylporphyrin (TPP) and 2,3,7,8,12,13,17,18-octaethylporphyrin (OEP) with various oxidizing reagents were spectrophotometrically investigated in acetonitrile. The reaction products were confirmed to be the pi-cation radicals of the co…
A photochromic stilbazole unit has been incorporated into the bridge in a donor–bridge–acceptor scaffold constructed via a coordination interaction, wherein an efficient electron transfer occurs for the cis isomer of the bridge whereas no electron transfer is detected for the trans isomer.