Materials Literature
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RB (Rice-Bran) ceramics are new porous carbon materials made from rice bran, which is one of the main industrial wastes of Japan. The rice bran is at first mixed with phenol resin, and then, after forming, carbonized in nitrogen or vacuum atmosphere at higher than 900°C. The purpose of this study is to measure some me…
(opens in new window) Buy Article (opens in new window) Permissions and Reprints (opens in new window) All articles of this category (opens in new window) The synthesis of 2,3,5-trialkylpyrroles can be easily achieved by conjugate addition of nitroalkanes to 2-alken-1,4-dione (prepared by oxidative cleavage of 2,5-dia…
Combinations of failure mechanisms are frequently encountered in the life prediction of composite materials. A life prediction methodology is developed and applied to one such failure mechanism combination. This method uses experimental data and analytical tools to predict the long-term behavior of a composite under s…
Toughening mechanisms in polycrystalline ceramics were discussed based on Griffith's energy equilibrium. These mechanisms were classified into three groups: (1) The frontal process-zone toughening mechanism, which is related to the intrinsic fracture energy of a material, and creates a damaged zone ahead of the crack…
Recently, irradiation assisted stress corrosion cracking (IASCC) of austenitic stainless steels for core internal components materials become a subject of discussion in light water reactors (LWRs). IASCC has not been found in Pressurized Water Reactors (PWRs). However, the authors have investigated on the possibility…
By using the two-liquid geometric method and the three-liquid acid-base method, we are the first to determine the surface tensions of ladderlike polyepoxysiloxanes by the measurement of contact angles on thin films. Three kinds of ladderlike polymers have been synthesized: AC (which has the alkyl group and the epoxy…
During the studies on fouling diatoms in Zuary estuary the overlying surface diatoms were also studied for comparison. In all 66 spp. of planktonic diatoms have been recorded, belonging to 29 genera. Out of these, 36 species (16 genera) were Pennales and 30 (13 genera) Centrales. The common diatoms observed were Chaet…
The rates of formation of the DCTA complexes of Ce3+, Eu3+ and Yb3+ are significantly lower than expected on the basis of the water-exchange rates of Ln3+(aq). The kinetics of formation of these complexes were studied by means of a stopped-flow method. The reactions were found to be first order in the reactants, and t…
Flax fibers coated with two types and various amounts of silicones are used to make flax-polyurethane composites. Coating conditions have been found to affect strongly the composites properties. The effect of these two types and different amounts of silicone on the impact toughness, flexural strength and modulus, dyna…
In this work we study the effect of the nixtamalization time on the structural, morphological and thermal properties of the corn pericarp. We also studied the semi-quantitative changes in the chemical composition of the pericarp by x-ray diffraction. By correlating the results obtained by x-ray diffraction and photoac…
The pathway of dehydration and intramolecular cyclization of lisinopril dihydrate in the solid state was investigated using differential scanning calorimetry (DSC), thermogravimetric analysis (TGA) and a combination of thermal analyzer with Fourier transform infrared microspectroscopy (thermal FT-IR microscopic system…
The choice of polymeric materials in electronic packaging influences not only the performance parameters of electronic devices, but also their long-term reliability. Adverse conditions such as humidity, high temperature, and vibration prevent the electronic devices from functioning in the way that they were designed.…
The change of network morphology of unfilled sulfur crosslinked natural rubber exposed to thermal oxidative ageing has been studied. Three model networks with different sulfur contents (efficient network, semi-efficient and conventional vulcanizate) have been analysed by applying spin probe ESR, equilibrium swelling m…
The heat transfer coefficients during natural convection of water on a downward-facing horizontal surface and that on a vertical surface were measured under the influence of ultrasonic vibrations. The multi-type oscillation used in this experiment was able to operate at three frequencies—28, 45, and 100 kHz—not only c…
A new photochromic cross-linked copolymer composed of PMMA and fluorescing 2-indolylfulgimide is synthesized which can be converted photochemically into two forms which are found to be thermally stable; the spectroscopic properties and quantum yields of photochemistry and fluorescence are also measured.
The cryptand derivative has H-bond mediated trigonal network structure that leads to octupolar bulk nonlinearity
Tetraethylorthosilicate (TEOS), hexamethyldisilazane (HMDS) and n-hexane, plasma deposited on alumina pellets, result in hydrophobic and chemically resistant films, while TEOS treated alumina powder showed significant changes in the zeta potential as a function of pH.
Several strains of thermophilic bacteria containing maleate cis-trans isomerase were isolated from soil samples and identified as Bacillus stearothermophilus, Bacillus circulans, Bacillus brevis, and Deleya halophila. The maleate cis-trans isomerase was purified and characterized from one of the isolated strains, B. s…
The effects of lamination temperature on the properties of poly(ethylene terephthalate-coisophthalate) (co-PET), such as thermal, mechanical, and barrier properties, have been investigated in co-PET laminated steel. The variation of the degree of crystallinity and the orientation of the co-PET film during the laminati…
Degradable polymers including Eastar Bio Copolyester 14766 (EBC), Mater-Bi ZF03U (MBI) andpolylactic acid (PLA) blended in various ratios (10, 25, and 40%) with regular (25% amylose) and waxy corn starcheswere extruded into loose-fill packaging foams using a co-rotating twin screw extruder. No significant differences…