Materials Literature
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Abstract Ethylene vinyl acetate copolymer (EVA) and monmorillonite (MMT) nanocomposites have been investigated as a function of vinyl acetate content and molecular weight of EVA and types of substituted alkyl ammonium of MMT. It is found that vinyl acetate content and type of substituted alkyl ammonium are important f…
The effects of dissolved hydrogen on the thickness, structure, and composition of the passive film on iron formed in a boric/borate solution at pH 8.4 were investigated by Auger electron spectroscopy (AES), secondary ion mass spectrometry (SIMS), and nuclear reaction analysis (NRA). AES analysis showed that hydrogen d…
In this work, highly dispersed silica is obtained using a precipitation technique from emulsion medium. The selected emulsifier, applied in the process, allows production of silica with almost ideally spherical particles. To examine the tendency to aggregation, the silica powder is treated with commercially available…
Microstructures and strength of variously heat treated eutectoid steel were evaluated by magnetic property measurements. Isothermal transformation, continuous cooling or spheroidization heat treatment was performed to produce various microstructures. Microstructural parameters (phase, pearlite interlamellar spacing),…
In this paper, we reported an effective method for controlling CaSO4 crystal growth in organic media. Ca2+ and SO42− ions were extracted into the organic phase using different extractants. Different morphologies and sizes of CaSO4 nanocrystals including nanoparticles and nanosheets and long fibers were prepared by cha…
An equi-molar mixture of potassium fluoride (KF) and one of alkaline-earth or transition metal fluoride MIIF2 (MII = Mg, Ca, Mn, Fe, Co, Ni, and Zn) was ground in air by using a planetary ball mill to investigate mechanochemical (MC) synthesis of fluoroperovskites KMIIF3. Rietveld refinement for the ground mixtures wa…
The influence of various basic factors of combustion gas flow conditions on the recession rate of silicon nitride, silicon carbide, and alumina has been experimentally clarified, and the recession rate equation is deduced using the dependence of influential factors on the recession rate and the mass transfer theory. T…
Spheroidization behavior of cementite in a low carbon steel processed by the equal channel angular pressing technique was investigated. The effects of annealing temperature and time, and accumulated strain on the morphology of cementite and mechanical properties were studied. The results indicated that the application…
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…