Materials Literature
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Nanosize particles of SrFe12O19 have been synthesized by a citrate precursor technique with various Fe/Sr ratios of 12.0 to 9.0. X-ray diffraction (XRD) studies showed the formation of ultrafine, monophasic SrFe12O19 particles with comparable unit cell parameters. Magnetic clusters were observed by scanning electron m…
M. Ogawa, Annu. Rep. Prog. Chem., Sect. C: Phys. Chem., 1998, 94, 209 DOI: 10.1039/PC094209
A thermostable polysaccharide‐protein complex capable of accelerating the deterioration of mild steel was produced by a marine strain of sulfate‐reducing bacterium of the genus Desulfovibrio, and partially purified using low‐pressure chromatography. This complex induced pitting of steel in oxic aqueous solution. The i…
The cattle feedlot industry is under increased scrutiny and regulatory involvement at state and national levelswith regard to particulate matter (PM) emissions from fugitive sources. Concentrations of total suspended particulatematter (TSP) and PM less than 10 micrometers (PM10) aerodynamic equivalent diameter (AED) w…
Hysteresis is present to varying degrees in virtually all dynamic smart material systems. In many applications, it can be limited through the choice of materials and operating regimes so that linear, anhysteretic models are applicable. With the advent of new high performance materials and more strin gent performance…
Optimized geometries, vibrational frequencies, scale factors, and IR absorption intensities were calculated for the 1,2,3-triazole anion ( 1 ) at the B3LYP, LDA, BLYP, BVWN, HF, and MP2 levels of theory using the 6-31G** (BS1), 6-31++G** (BS2), cc-pVDZ (BS3) and aug-cc-pVDZ (BS4) basis sets and for 1,2,4-triazole ( 2…
Phase relations including reoxidation and decomposition reactions were investigated for samples with nominal composition LaCoO3–δ(0.00≤delta;≤0.50). LaCoO3–δwas synthesized by isothermal reduction at 673 K. Forδ=0.50 and 0.33 distinct phases occur, namely La2Co2O5 and La3Co3O8 . La2Co2O5 oxidizes via La3Co3O8 to LaCoO…
Three cardenolide glycosides, calotropin (1), frugoside (2), and 4'-O-beta-D-glucopyranosylfrugoside (3), were obtained as the cytotoxic principles of "akond mul" (roots of Calotropis gigantea L.). The cytotoxicity of these compounds against various cell lines of human and mouse origin was tested. They showed similar…
Under base catalyzed conditions, reaction of azuliporphyrin 3 with tert-butyl hydroperoxide affords the benzocarbaporphyrins 2a and 2b; a mechanism for the formation of 2b is proposed.
The cyclic deformation and fatigue of a TiNi shape-memory alloy wire were studied by carrying out rotating-bending fatigue tests at various strain amplitudes, temperatures, and rotational speeds in air and in water. The results were summarized as follows: (1) for strain amplitudes in the rhombohedral-phase transformat…
Previously manufactured oxide dispersion strengthened (ODS) ferritic steel cladding tubes had inferior internal creep rupture strength in the circumferential hoop direction. This unexpected feature of ODS cladding tubes was substantially ascribed to the needle-like grain structure aligned with the forming direction. I…
Three series ofN-(3,4-dialkoxybenzylidene)-N′-(3′,4′,5′-trialkoxybenzoyl)hydrazine and their nickel(ii) complexes, bis[N-(3,4-dialkoxybenzylidene)-N′-(3′,4′,5′-trialkoxybenzoyl)hydrazinato]nickel(ii), were prepared and characterized. The mesomorphic properties of these disc-like compounds were also studied in terms of…
Nicotinamide is a hydrotropic agent that has been demonstrated to solubilize a wide variety of drugs through complexation. Past investigations on the potential interaction of nicotinamide with a solubilized drug have inadequately focused on aliphatic hydrotropes. This study examined the mechanism for the hydrotropic s…
Silica, exhibiting crystalline texture has been prepared from aqueous solution at pH ca. 7 in the presence of intrasilica biomolecules extracted from the primitive plant Equisetum telmateia; some of the silica shows interplanar lattice spacings of 3.5 Å and is present in lath-like objects up to ca. 20–30 nm wide and m…
Rh/CeO2 systems prepared by anionic exchange of anionic rhodium chloro complexes contain significant amounts of chloride. They are referred to as Rh(Cl)/CeO2 catalysts. Reduction at 1173 K does not decrease the chloride content of these catalysts but calcination in air at the same temperature leads to total eliminatio…
Positively charged magnesium aluminium hydroxide sol has been prepared by coprecipitation. The structure and properties were studied using X-ray diffraction (XRD), thermogravimetry (TG), differential thermal analysis (DTA), transmission election microscopy (TEM), FTIR and potentiometric titration (PT). The structure w…
The formation pathway of microporous layered tin(iv) sulfides A2Sn3S7 and A2Sn4S9 (A=cation), respectively denoted SnS-1 and SnS-3, synthesized from elemental Sn and S sources in the presence of templates and mineralizers has been studied. Three types of reaction intermediates, dimeric [Sn2S6 ]4– , polysulfides [Sn(S4…
Crystal structure of gadolinium borate Gd17.33(BO3)4(B2O5)2O16 has been refined by the Rietveld method from X-ray powder diffraction data. Gd17.33(BO3)4(B2O5)2O16 crystallizes in the monoclinic space group Cm with lattice constants a=1841.70(3), b=374.08(1), c=1419.30(3) pm and β=119.85(1)°. The structure contains two…
The adsorption of CO on a Pt/TiO2 sample has been studied by IR spectroscopy. On the unreduced sample, CO is adsorbed reversibly on Ti4+ cations (bands at 2188 and 2206 cm−1) and irreversibly on Pt4+ and Pt2+ sites (bands at 2186 and 2138 cm−1, respectively). Water replaces CO adsorbed on Pt4+ sites and interacts with…
In order to elucidate the mechanism for the protective ability of final stable rust layer formed on a weathering steel by atmospheric corrosion, the ion selective property of rust layer was studied by the use of synthetic iron rust membranes. Anion selective property was increased in this order: Fe3O4<α-Fe2O3<α-FeOOH<…