Materials Literature
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Abstract A new method for determining the cation exchange capacity (CEC) of clays is proposed. The method is based on X-ray fluorescence analysis of natural and Ba-exchanged clays following the analytical procedure suggested by Franzini et al. (1975). This procedure, which utilizes powder pellets and is based on a ful…
The properties of ferroelectric ceramics based on barium strontium titanate and doped by admixtures with low permittivity and dielectric loss tangent are studied experimentally. These ceramics are viewed as a promising material for microwave devices applied in the acceleration technology. Ceramic samples the I-V chara…
The piezoelectric properties of a Pb[(Mg 1/3 Nb 2/3 ) 0.68 ]Ti 0.32 O 3 [PMNT(68/32)] binary-system single crystal poled along the [001] direction in the rhombohedral phase were investigated under various pressures up to 400 MPa at 25 °C. The electromechanical coupling coefficient k 33 in the k 33 mode decreased sligh…
The stability and lyophilization of core-shell PCL-PEG-PCL micelles were investigated by fluorescence spectra, DLS, DSC, WAXD, and FT-IR. The prepared micelles were not stable when they were stored in aqueous dispersion under different condition. Their size increased in the first 20 days and decreased gradually when t…
Among a series of power ramp tests on 25 Zr-lined segment rods of burnup ranging from 43 to 61 GWd/t, five segment rods failed during the power ramp tests. One segment rod irradiated for 3 cycles (43 GWd/t) failed with a pinhole due to PCI/SCC. The rest of higher burnups failed with an axial crack on the outer surface…
Data are discussed pertaining to influence of in-pile irradiation on microstructure, tensile and corrosion properties of E110 and E635 cladding samples taken along fuel rods that have operated for ~5 and 3 years in RBMK and VVER-1000 reactors, respectively. In the initial condition the E110 cladding structure was a re…
The effect of the molecular mass of polyethylene glycol (PEG) on its adsorption on platinized platinum from aqueous solutions of 0.5 M H 2 SO 4 and 1 M HCl is studied using the methods of open-circuit potential shifts and voltammetry. In sulfuric acid solutions, the PEG adsorption is accompanied by dehydrogenation and…
The force fields Tersoff, CHARMM, COMPASS, CVFF and PCFF are compared using molecular calculations and simulations of SWNT thermal properties. The heat capacity results from the force fields vary significantly in the low (room) temperature range. The COMPASS force field best reproduces the phonon frequencies calculate…
This paper reports the use of advanced materials characterisation techniques, X-ray microtomography and surface strain mapping by electronic speckle pattern interferometry (ESPI), to study the mechanisms of damage nucleation in polygranular nuclear graphite. It is found that strain localisation occurs owing to the het…
In ferroelectrics, it is sometimes observed that the local structure is different from the average structures. We observed the difference between the local and average structure of Bi 4 Ti 3 O 12 . The average and local structures were refined by Rietveld and Pair-distribution function (PDF) analysis, respectively. Th…
The thermolysis of dihydrogenphosphates with the general formula MnMn1−x Znx(H2PO4)2 · 2H2O (0 < x < 1.00) is studied. Two parallel thermolysis routes are found to yield cyclotetraphosphate solid solution of composition (Mn1−x Znx)2P4O12 (monoclinic space group C 2/c, Z = 4) as the final product. The sequence of physi…
Vanadium oxide supported on hydrotalcite-type precursors was studied in the oxidation of isopropanol. Hydrotalcites with different y = Mg/Al ratios were synthesized by the method of coprecipitation nitrates of Mg and Al cations with K2CO3 as precipitant. The decomposition of these hydrotalcite precursors at 450°C yiel…
Abstract— A large number of new synthesized as well as known chiral dopants with respect to their helical twisting power (HTP), the phase stability of cholesteric solution prepared by doping nematic LC mixtures, the host dependence of the chiral induction, and the photostability has been examined. The evaluation led t…
Abstract Ternary hybrid interpenetrating networks composed of polyurethane (PU), poly(methyl methacrylate) (PMMA) and silica were prepared by in situ bulk polymerization. The inorganic phase was generated from tetraethoxysilane (TEOS) via sol‐gel chemistry. Highly transparent films were successfully synthesized using…
Barium titanate (BaTiO3) colloidal sphere array was prepared by meniscus method using capillary force between particles from slurry. To pack particles closely, well-dispersed slurry was obtained using electric double layer. From SEM observation, it was confirmed that the colloidal sphere array had point contact or pla…
We prepared gold/lead zirconate titanate (PZT) nanocomposite thick films by the aerosol deposition method (ADM) for the first time and report their enhanced surface plasmon resonance (SPR) properties. ADM has been attracting much attention for its ability to deposit complex composite films at a high deposition rate an…
Multi-walled carbon nanotubes (MWCNTs) were synthesized from camphor by a chemical vapor deposition (CVD) method in a range of 750-900. The catalyst was fed in three ways: (a) a sputtered Fe-film on a quartz substrate (b) vaporized ferrocene in an Ar flow; (c) both of (a) and (b). In the case (c), highly pure, dense a…
Constitutive formulation of strain gradient plasticity for geomaterials via a thermomechanical approach is investigated in this paper. It is demonstrated that, by defining two thermodynamical potentials (a freeenergy function and a rate of dissipation function), the entire constitutive behavior of a decoupled straingr…
In this paper, an accurate and efficient characterization of three-dimensional electromagnetic bandgap (3D-EBG) structures is performed, which exploits a full-wave theory developed for doubly periodic gratings. The theoretical approach is presented, details on the numerical implementation are given, and the potentiali…
Chlorination of MgOHCl particles with HCl gas was examined and complete conversion to MgCl2 was observed within 60 min in the temperature range 325–525°C. X-ray diffraction analysis of samples treated for varying times revealed that MgOHCl was directly converted into MgCl2 without first decomposing into MgO. Such beha…