Materials Literature
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A partir d'une breve histoire des composites ceramiques, apres avoir defini les contraintes physiques et chimiques que doivent satisfaire idealement le renfort et sa matrice ceramique oxyde, nous discutons, au travers de quelques exemples dont les aluminosilicates de lithium (LAS) des criteres contradictoires, physiqu…
This paper reports the occurrence and crystal structure of farneseite, a new member of the cancrinite-sodalite group from Farnese (Viterbo province, Latium, Italy). The mineral was observed within a syenitic ejected block consisting of dominant sanidine with minor andradite, clinopyroxene (augite), biotite, Fe-oxides…
The hydrogenation behavior of the polar intermetallic systems AeE2 (Ae = Ca, Sr, Ba; E = Al, Ga, In) has been investigated systematically and afforded the new hydrides SrGa2H2 and BaGa2H2. The structure of these hydrides was characterized by X-ray powder diffraction and neutron diffraction of the corresponding deuteri…
Phenol is a potential hazard to human health and the environment. The \nsonochemical degradation of phenol in aqueous solution was investigated \nby use of a 35 kHz bath sonicator. Experiments were performed at \ninitial phenol concentrations varying from 1 to 100 mg/L. The effects \nof parameters such…
Silicate is polymerized in the presence of chitosan to form novel silica−chitosan nanoparticles in weakly acidic solution under ambient conditions. Both the turbidity of the silica solution and the average hydrodynamic diameter of the silica nanoparticles increased dramatically after the addition of chitosan. The init…
The first successful synthesis of photoresponsive multilayer spiral nanotubes by the introduction of polyfluorinate cationic azobenzene derivative, trans-[2-(2,2,3,3,4,4,4-heptafluorobutylamino)ethyl]-{2-[4-(4-hexyphenylazo)-phenoxy]ethyl}dimethylammonium (abbreviated as C3F7-Azo+), into layered niobate interlayer I b…
We have observed that the hexagonal GaN nanowires grown from a simple chemical vapor deposition method using gallium metal and ammonia gas are usually gallium-doped. By annealing in air, the gallium-doped hexagonal GaN nanowires could be completely converted to beta-Ga(2)O(3) nanowires. Annealing the beta-Ga(2)O(3) na…
Thin, long gold/silver nanowires were grown on substrates in thin surfactant solution films. This growth process occurred exclusively in thinning aqueous films as the water evaporated, and elongated surfactant template structures were formed. The nanowire growth depended on the presence of a relatively high concentrat…
Time-resolved small-angle X-ray scattering (SAXS) measurements were performed to study in-situ formation of palladium (Pd) nanoparticles in block copolymer microdomains. The nanoparticles were reduced in a reaction medium containing a fixed composition of polyisoprene- block -poly(2-vinylpyridine) (PI- b -P2VP), palla…
The ac. conductivity σ and dielectric properties [dielectric constant έ, dielectric loss ε˝ and loss tangent (tan δ)] were measured as a function of frequency from 102 to 106 Hz for the mixed ferrites Mg1- x Zn x Fe2 O4 (where × = 0 to 0.6). It was observed that the ac conductivity σ is independent of frequency for f…
Stolarski, Jarosław, Mazur, Maciej (2005): Nanostructure of biogenic versus abiogenic calcium carbonate crystals. Acta Palaeontologica Polonica 50 (4): 847-865, DOI: 10.5281/zenodo.13625333
We have studied technogenic, high-uranium zircon, which crystallised from melt formed during the accident at the Chernobyl Nuclear Power Plant in 1986, by confocal Raman spectroscopy, electron microprobe, and backscattered electron imaging. The correlation between Raman and electron microprobe measurements allowed stu…
Volume 57 of Reviews in Mineralogy and Geochemistry highlights the present knowledge on micro- and mesoporous mineral phases, with focus on their crystal-chemical aspects, occurrence and porous activity in nature and experiments. As zeolites are the matter of numerous ad hoc meetings and books - including two volumes…
The homothallic, filamentous ascomycete Sordaria macrospora is self-fertile and produces sexual fruiting bodies (perithecia) without a mating partner. Even so, S. macrospora transcriptionally expresses two pheromone-precursor genes (ppg1 and ppg2) and two pheromone-receptor genes (pre1 and pre2). The proteins encoded…
The solid state structure of 1,1'-bis(verdazyl)ferrocene reveals the two radical moieties associated intramolecularly to give the first example of a pi-dimer of a stable verdazyl radical. The pi-dimer structure is not maintained in solution. Magnetic characterization indicates that the radicals are sufficiently strong…
We examine the impact of growth kinetics on the incorporation of Mn dopants into ZnSe nanocrystals. We synthesize such particles, also known as colloidal quantum dots, and use optical spectroscopy to extract information about the average number of Mn impurities per nanocrystal as the reaction proceeds. We find that th…
Changes in the thermogravimetrically determined oxidation behaviors of CVD-grown multiwalled carbon nanotubes with varying synthesis conditions are examined. Catalyst type and synthesis temperature are found to have a measurable impact upon nanotube stability, suggesting differing levels of crystalline perfection in t…
Novel nanofibrous membranes containing reactive carboxyl groups were fabricated from poly(acrylonitrile- co -maleic acid) (PANCMA) by the electrospinning process. The morphology and fiber diameter were analyzed with field emission scanning electron microscopy. It was found that the fiber diameter could be varied from…
With neutron powder diffraction, electron diffraction, and second-harmonic generation, we have shown that BiScO3 has a structure closely related to that of multiferroic BiMnO3, but BiScO3 crystallizes in the centrosymmetric space group of C2/c. These results bring up a question about the origin of ferroelectricity in…
The shot noise of the current through a single electron transistor (SET), coupled capacitively with an electronic box, is calculated, using the master equation approach. We show that the noise may be sub-Poissonian or strongly super-Poissonian, depending mainly on the box parameters and the gate. The study also suppor…