Materials Literature
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A multiple grafting technique was used to synthesize arborescent-branched high-molecular mass poly(2,3-epoxypropan-1-ol). In the first step, linear polyglycidol (M̄n = 10 300) was obtained. Some of the hydroxyl groups were transformed into alcoholate anions in a reaction with potassium tert-butoxide, and the obtained…
Two new mineral species, carraraite and zaccagnaite, were found in cavities in calcite veins in marble quarries of the Carrara basin (Apuan Alps, Italy). Carraraite, Ca 3 Ge(OH) 6 (SO 4 ) 1.08 (CO 3 ) 0.92 ⋅12H 2 O, occurs as submillimetric crystals, tabular on {001}. The cell dimensions are a = 11.056 (3), c = 10.629…
Gel‐derived oxycarbide glasses have atomic network structures similar to that of vitreous silica glass but with carbon‐rich regions consisting of CSi 4 tetrahedra and C–Si–O bonds finely dispersed in the glass. Therefore, oxycarbide glasses exhibit the so‐called “anomalous” hardness behavior, similar to silica‐rich gl…
The paper presents a preliminary study on feasibility using shape memory alloy (SMA) passive devices for vibration suppression of building structures. A one-story prototype-building model is used. The structure is subjected to a base excitation and is strengthened by SMA diagonal bracing wires. Constitutive behavior o…
Abstract To modify carbon black surface, the surface grafting of hyperbranched poly(amidoamine) onto the surface by using dendrimer synthesis methodology was investigated. Carbon black having amino groups (initiator sites) was prepared by the reduction of surface nitro groups introduced by nitration of aromatic rings.…
Ce-doped and undoped LiCaAlF 6, LiSrAlF6, LiYF4, LiLuF4 and KMgF3 single crystals were grown by the Czochralski technique under CF4 atmosphere. The effective distribution coefficients of Ce3+in LiCaAlF6, LiSrAlF6, LiYF4 and LiLuF4 were determined to be 0.031, 0.028, 0.116 and 0.054, respectively. Laser output energy o…
Defective perovskites contained in the general formula La(Sr)Cr(Ru,Mn)O 3–δ are successfully synthesized by spray pyrolysis. Powders of high phase purity are obtained after annealing, and they are used to prepare homogeneous films by spray printing. From a catalytic point of view for the methane steam reforming, these…
We have demonstrated that a quaternary Ge–Sn–Sb–Te phase-change recording material obtained by adding Sn to Ge–Sb–Te has a higher crystallization speed than Ge–Sb–Te, and gives a larger erase ratio than Ge–Sb–Te when film thickness is decreased. Static evaluations have shown that a 6-nm-thick quaternary material was c…
A continuous carbon fiber/silicon carbide matrix composite material has been produced by a low‐cost process. In this process the space in a two‐dimensional carbon fiber preform is filled with a SiC powder by a pressure infiltration method. High particle packing densities are achieved within the fiber preform in this w…
A structural analysis of CaSO 4 · 0.5H 2 O, a dehydration product of gypsum, has been carried out through the Rietveld method on X-ray powder diffraction data. A dehydrated powder of synthetic gypsum has been charged inside a non-hermetically sealed capillary in order to allow a slow rehydration. The starting material…
The inhibition efficiency of N‐cetyl‐N,N,N‐trimethylammonium bromide (CTAB), a cationic surfactant, in controlling the corrosion of carbon steel in an aqueous solution containing 60ppm Cl – , in the absence and presence of Zn 2+ and also calcium gluconate (CG), had been evaluated by the weight‐loss method. Weight‐loss…
The dynamical process of microstructure localization by multiscale interaction between instabilities is uncovered in directional solidification of transparent alloy. As predicted by Chen and Davis, morphological instability of the interface is observed at inward flow-stagnation regions of the cellular convective field…
The synthesis of Ti 3 SiC 2 by pressureless reactive sintering of Ti/SiC/C mixtures under an Ar atmosphere has been studied using in situ neutron diffraction. The intermediate phases TiC x and Ti 5 Si 3 C x ( x ≤ 1) form first at ∼800–1400°C. These phases are consumed in the formation of Ti 3 SiC 2 , at ∼1500°C. After…
This study investigates the thermal and electrical properties of SiC ceramics with a combination of Y 2 O 3 and rare‐earth‐oxide additions as sintering additives, by comparing four types of SiC starting powders varying in particle size and chemical composition. The powder mixtures were plasma‐activation sintered to fu…
Nanophasic tungsten oxides thin films have been deposited at 500 °C on quartz and glass substrates starting from W(CO)6 using the metal organic chemical vapor deposition technique (MOCVD). Two series of deposition experiments were carried out to make a comparison between the results obtained employing, as reactant gas…
Abstract The effect of paper sludge's particle size and extrusion temperature on the physical and mechanical properties of paper sludge–thermoplastic polymer composites was investigated. In the experiment three levels of particle sizes for the paper sludge and four extrusion temperatures were designed to examine the p…
In this paper, the syntheses of a variety of substituted phenyl pyrenes 5a−n by Suzuki cross-coupling and of two decoupled analogues 10 and 17 are reported. These compounds have been investigated by fluorescence spectroscopy. The solvatochromism of their emission bands (Stokes shift) and the quantum yields in methylcy…
ABSTRACT: Modified atmosphere packaging (MAP) is increasingly used with minimally processed produce. Increased MAP usage coupled with negative environmental views associated with nondegradable synthetic packaging materials creates a need for biodegradable films. Zein films plasticized with oleic acid had been proposed…
Single crystals and ceramics of (1- x )PMN– x PT were synthesized in the whole concentration range from x =0 to x =1, and the temperature-concentration phase diagram of the system was determined from the dielectric measurement. The temperature dependences of the Raman spectra in the mixed crystals were measured. Raman…
Nanocrystalline α‐Al 2 O 3 ceramic powders have been prepared from an aqueous solution of aluminum nitrate and sucrose. Soluble Al ion‐sucrose solution forms the precursor material once it is completely dehydrated. Heat treatment of the dehydrated precursors at low temperature (600°C) results in the formation of porou…