Materials Literature
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A new method of hydrolysis-polycondensation of silsesquioxanes, the OG-HG (Organo Gel-Hybrid Gel or Organised Gel-Hydrolysed Gel) process allows the transcription of the supramolecular architecture of organogels to corresponding hybrid silsesquioxanes.
High surface area cobalt–iron oxides (with Co ∶ Fe ratios of [3 ∶ 1], [1 ∶ 1] and [1 ∶ 2]) have been prepared by the calcination of predominantly single-phase, coprecipitated hydrotalcite-type precursors prepared from mixed-Co2+–Fe3+ aqueous solutions. The oxide structures were all spinels; for the Co–Fe [3 ∶ 1] oxide…
Polycrystalline Alloys of Mg-3Al-1Zn (AZ31) were obtained by equal channel angular extrusion and subsequent annealing at 300°C for 24 h or at 500°C for 4 h. These samples had average grain sizes of 7 μm and 50 μm, respectively. Tensile tests were performed at room temperature at an initial strain rate of 1×10−3 s−1.Th…
Monomethine cyanine dye 4-((1-methylbenzothiazolyliliden-2)methyl)-1,2,6-trimethylpyridinium perchlorate (Cyan 40) was investigated as a two-photon-excited fluorescence probe for nucleic acids (NA). Cyan 40 has been shown to demonstrate efficient two-photon-excited fluorescence in the presence of NA in vitro in contra…
Mn-doped monoclinic, tetragonal and cubic zirconia samples were characterized by XRD and EPR. The cubic modification was obtained by doping hydrous zirconia with Y2O3 (YSZ). The ZrO2 structure influences the solid solution formation and the nature of manganese species. EPR analysis revealed the following manganese par…
Some hydrogen storage materials with the hexagonal CaCu5-type crystal structure have two pressure plateaux during hydrogen absorption and desorption processes. To clarify the correlation of hydrogenation properties between two plateaux, we investigated the pressure-composition isotherms of several binary RNi5 (R = La,…
In cationic nine-coordinate chiral terbium and europium complexes incorporating exciton-coupled naphthyl groups and a tetraazatriphenylene sensitising chromophore, efficient intramolecular energy transfer occurs leading to population of the naphthyl triplet state. With the terbium complex, the absolute quantum yield o…
In the present paper we report the preliminary results on the behaviour of chlorophyll a (Chl a), the main photosynthetic amphiphilic pigment of green plants, in water and aqueous solutions of cyclodextrins (α-cyclodextrin, hydroxypropyl-β-cyclodextrin, heptakis(2,6-di-O-methyl)-β-cyclodextrin and hydroxypropyl-γ-cycl…
There are still several problems to be scientifically solved for the ``conventional''sol-gel ceramic coating technique to be utilized in industrial scale. Based on the recognition, the author's group studied the stress evolution and crack formation in gel-derived films and the evolution of radiative striations in spin…
CaS:Bi, CaS:Ag, CaS:Pb, and Sr 1 − x Ca x S nanocrystallites were synthesized via a solvothermal method at a relatively low temperature. The method is more environmentally friendly than traditional preparations (very little sulfur-based gases are formed and the method does not involve toxic H 2 S or CS 2 ) . Additiona…
Silylated derivatives of K2Ti4O9 x nH2O were successfully synthesized by the reaction of octylammonium-tetratitanate intercalation compound with n-alkyltrimethoxysilanes.
The U.S. Department of Energy is leading an international initiative to develop the Generation IV Nuclear Reactor. The vast majority of the nation's 104 reactors are type Generation II; Generation III designs (i.e., Advanced Boiling Water Reactor) and have only been built overseas (Korea, Japan). The Generation IV rea…
The present study was conducted to investigate the inclusion complexation of artemisinin (ART) with natural cyclodextrins (CyD), namely alpha-, beta-, and gamma-CyDs with the aim of improving its solubility and dissolution rate. Complex formation in aqueous solution and solid state was studied by solubility analysis,…
Peptide and protein microencapsulation into poly(lactide) (PLA) and poly(lactide-co-glycolide) (PLGA) microspheres continues to represent a technological challenge in terms of product sterility and up-scaling. The primary objective of this study was to examine the feasibility of a novel method for peptide and protein…
Local electrochemical impedance mapping (LEIM) was used to investigate local underfilm corrosion occurring on organic-coated AA2024-T3 exposed to chloride solution. Films (5-20 μm thick) of neat epoxy, polyurethane, and vinyl resins were studied. Frequently observed features in the LEI maps included: an unexpected dec…
It was shown previously that nanoparticles of layered compounds form closed-cage and nanotubular structures. These nanostructures received the generic name of inorganic fullerene-like (IF) materials. In particular nanoparticles of metal dihalides, like NiCl2 and CdCl2, were shown to form such closed-cage structures in…
Density functional theory calculations of the substitution and insertion of chlorides on hydroxylated NiO(111) surfaces have been performed to simulate the penetration mechanism of initiation of localized corrosion of passivated metal surfaces. The substitution of surface hydroxyls by is found to be endothermic with t…
Studies of the ring-opening polymerization (ROP) of L-lactide by Ph2SnX2 reveal that X (X = NMe2 or OPri) influences not only the rate of polymerization but also the nature of the polymer formed. Gel permeation chromatography (GPC), mass spectral analysis and 1H NMR spectroscopy of the polymers from these reactions re…
To develop a new alloy with high hydrogen storage capacity, partial Cr in TiCr1.8 was substituted by V—Fe alloy. X-ray diffraction and metallography observation proved that the substitution did not change the phase constitution of TiCr1.2(V–F)0.6. It still remained in its initial Laves phase related body centred cubic…
Three-dimensional (3D) porphyrin monolayer protected metal nanoclusters (MPCs) have been prepared to examine the effects of metal (Au, Ag, Au–Ag alloy, Pd and Pt) and size (1–3 nm) on the structures and photophysical properties. The quenching rate constants of the porphyrin excited singlet state by the surfaces of mon…