Materials Literature
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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<…
Pure BaMg2Si2O7 , and its europium and magnesium doped forms, have been synthesized by solid state reaction. BaMg2Si2O7 and BaMn2Si2O7 crystallize in an orthorhombic structure with the space group Ama2. The lattice constants obtained from X-ray powder diffraction are a=13.742(2) Å, b=12.698(2) Å and c=7.237(1) Å for B…
Cerium(III) sulfide (Ce 2 S 3 ) powder was synthesized via the sulfurization of ceria (CeO 2 ) powder using carbon disulfide gas. Single‐phase α‐Ce 2 S 3 could be formed via sulfurization at 973 K for 28.8 ks. The preparation of α‐Ce 2 S 3 became feasible at low temperature, in comparison to sulfurization using hydrog…
The solution sol-gel method is used to produce thin films of photosensitive hybrid organic-inorganic glass on silicon. Glasses consisted of photoinitiator, methacryloxypropyltrimethoxysilane, methacrylic acid, and zirconium oxide. Clear, low optical loss films are obtained, indicating nanophase homogeneity in the samp…
Abstract. Various nanocomposite systems have been synthesized by sol-gel routes. For this reason, prefabricated nanoparticles (SiO2 sols or boehmite powder) have been dispersed after surface modification in sol-gel-derived organically modified or polymeric ligand matrices. In all cases, a significant effect on dispers…