Materials Literature
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Abstract Water extracts from leaves of date palm, phoenix dactylifera , henna, Lawsonia inermis , and corn, Zea mays , were tested as corrosion inhibitors for steel, aluminum, copper and brass in acid chloride and sodium hydroxide solutions using weight loss, solution analysis and potential measurements. The inhibitio…
Abstract The effect of CO 2 on the isothermal crystallization kinetics of poly(ethylene terephthalate), PET, was investigated using a high‐pressure differential scanning calorimeter (DSC), which performed calorimetric measurements while keeping the polymer in contact with presurized CO 2 . It was found that the crysta…
Hiroshi Miyamoto, Masato Yano, Tomoyuki Miyashita; Similarities in the structure of nacrein, the shell-matrix protein, in a bivalve and a gastropod, Journal of
The magnetic field in many magnetic components, namely toroids and EE cores, has a three-dimensional (3-D) distribution. Energy and losses calculation in these particular structures makes necessary the use of 3-D techniques that accounts for all 3-D effects. The calculation of the energy and losses is needed in order…
Thin films of Sr2FeMoO6 have been deposited on single-crystalline and polycrystalline SrTiO3 substrates by pulsed laser deposition from a stoichiometric target. In order to obtain high-quality films, the deposition parameters were systematically optimized. The films grown under optimized conditions show properties com…
Abstract ESI‐MS analysis provides a straightforward tool for the solution characterization of highly charged mono‐lacunary Keggin‐type polyoxotungstates α‐[XW 11 O 39 ] p − (X = Si, P; p = 8, 7). Doubly and triply charged quasi‐molecular ion peaks were identified on the basis of both the theoretical simulation of the…
The increasing utilization of sea water as a medium for transportation, communication, energy generation, oil and mineral exploitation and as an industrial fluid has direct impact on problems associated with the maintenance of marine structures and machinery. Keeping this in mind, numerous investigations on the corros…
This article presents a method for solving moving-boundary problems associated with phase change. This method is an explicit interface-tracking scheme that involves the reconstruction and advection of the moving interface on a fixed grid. Three distinct steps are undertaken to handle the movement of the interface: adv…
Abstract The paper describes the synthesis of starch phosphate carbamides by reacting starch with phosphoric acid and urea. A solid state technique in vacuum at elevated temperatures is used. The degree of substitution of phosphate (DS P ) and carbamide groups (DS C ) can be adjusted by the molar ratio of starch: phos…
Magneto-optical spectroscopy of a transparent ferromagnetic semiconductor, anatase TiO 2 doped with Co, is carried out at room temperature. A large magneto-optical response with ferromagnetic field dependence is observed throughout from ultraviolet to visible range and increases with increasing Co content or carrier c…
Brownian-dynamics computer simulations show a dynamical crossover in a strongly interacting colloidal suspension consisting of oppositely driven particles, wherein a uniform state transforms, with increasing driving force, into a locally demixed state characterized by strongly anisotropic stripe-like domains which are…
Generalized fractional relaxation equations based on generalized Riemann-Liouville derivatives are combined with a simple short time regularization and solved exactly. The solution involves generalized Mittag-Leffler functions. The associated frequency dependent susceptibilities are related to symmetrically broadened…
The outstanding space charge storage stability of porous polytetrafluoroethylene (PTFE) film electrets is studied by isothermal surface potential decay measurements and open-circuit thermally stimulated discharge (TSD) experiments after corona charging at room and elevated temperatures, or corona charging at RT and th…
Abstract A series of polyimides has been synthesized based on different dianhydrides and diamines. The microstructure of polyimide films has been analyzed by performing density measurements, X‐ray diffraction and UV‐visible spectrophotometry. The dynamic mechanical behavior was investigated according to both chemical…
Abstract The exact nature of tripuhyite remains controversial more than 100 years after the first description of the mineral. Different stoichiometries and crystal structures (rutile or tri-rutile types) have been suggested for this Fe-Sb-oxide. To address these uncertainties, we studied tripuhyite from Tripuhy, Minas…
Nous avons affine la structure de la nikischerite, Na Fe 2 + 6 Al 3 (S0 4 ) 2 (OH)(H 2 0) 1 2 . rhomboedrique, a 9.347(1), c 33.000(7) A, V 2497(3)A 3 , Z = 3, R3, jusqu'a un residu R de 6.4% en utilisant 444 reflexions observees, mesurees avec rayonnement MoKα. La structure est faite de feuillets planaires d'octaedre…
A majority of nonceramic insulator (NCI) application is under relatively clean conditions where leakage current may be nonexistent. Occurrence of corona for long periods of time on NCI operating under relatively clean conditions is possible due to localized high electric field (E-field) brought about by design and man…
In this article, the separation between reversible and irreversible polarization where the reversible polarization component is determined by capacitance–voltage curve measurements, is used to characterize ferroelectric materials. After giving a thorough foundation of the method, it is used to investigate the influenc…
Abstract Polysulfone (PSF) membranes were treated with ozone to introduce peroxides, and then grafted with either acrylic acid or chitosan, followed by the immobilization of heparin. The effect of spacer arm on blood compatibility was investigated using three chitosans of different molecular weight [1170 (water solubl…
Electrochemically induced strain and actuation in a polypyrrole/Au/polyimide laminate was measured using a sensitive strain gage during oxidation and reduction (redox) of polypyrrole−ClO 4 - . The polyimide formed the top layer of the strain gage, allowing direct measurement of strain during redox switching in various…