Materials Literature
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The authors discuss the water absorption behaviour of sisal and its epoxy based composites and the mechanical properties of composites that have been aged in water. In addition, a series of fibre pretreatment techniques, including mercerization, acetylation, cyanoethylation, coupling agent treatment and thermal treatm…
Abstract The effect of surface treatment on silica agglomerate dispersibility was investigated. Precipitated silica powders were treated with a commercially available coupling agent Bis-(triethoxysilylpropyl)-tetrasulphane (TESPT) in a blender. Spherical agglomerates of known density were prepared and dispersed in sty…
The reaction of HgCl2 and PPh2nPr with PhSeSiMe3 and Se(SiMe3)2 in THF at −30 °C results in the formation of yellow octahedral crystals of [Hg10Se4(SePh)12(PPh2nPr)4]. The molecular structure of the cluster is similar to structures of other [M10Se4(SePh)12(PR3)4] (M = Cd, Zn; R = organic group) cluster compounds altho…
Abstract Adsorbent material with a layered structure was obtained at room temperature. The synthesis involves the reaction of three ethanolic solutions (3-mercaptopropyltrimethoxysilane, aluminum acetylacetonate and magnesium nitrate). This is the first example of organophyllosilicate having Al in the tetrahedral and…
A “hydroceramic” (HC) is a concrete which possesses mineralogy similar to the zeolitized rock indigenous to the USA's current “basis” high level radioactive waste (HLW) repository site, Yucca Mountain (YM). It is made by curing a mixture of inorganic waste, calcined clay, vermiculite, Na2S, NaOH, plus water under hydr…
Containerless processing was used to investigate the glass‐forming behavior of Al 2 O 3 –Y 2 O 3 glass. The amorphous bulk samples were obtained at compositions with 25–37.5 mol% yttria when the melt was cooled at a cooling rate of ∼250 K/s. Although small spherical particles (∼10 μm) with the same composition of the…
To study the effect of the annealing temperature on the structure and magnetic properties of a 2%Si non-oriented steel cold rolled samples were submitted to final annealing in the temperature range of 540 °C to 980 °C in hydrogen atmosphere. The samples had received cold rolling reduction of 75% to a final thickness o…
Formyltransferase catalyzes the reversible formation of formylmethanofuran from N(5)-formyltetrahydromethanopterin and methanofuran, a reaction involved in the C1 metabolism of methanogenic and sulfate-reducing archaea. The crystal structure of the homotetrameric enzyme from Methanopyrus kandleri (growth temperature o…
We present the electrical transport properties of thermoelectric n-type Bi2(Te1−xSex)3 (x⩽0.125) polycrystalline alloys obtained by mechanical alloying and extrusion. It was determined that the charge carrier mobility decreases in the temperature range 90–300 K as the content (x) of Bi2Se3 is increased. The observed d…
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A range of new pyridinium bromides was synthesized by the quaternization of different substituted pyridines with a group containing a biphenyl core and alkyl chains of differing lengths. The phase behaviour of the pyridinium bromides was studied by differential scanning calorimetry, polarizing optical microscopy and p…
MgO thin films were prepared using two sols (hydrolyzed sol and stabilized sol) and the ion-induced secondary electron emission behavior of the resultant thin films was investigated. A severe fluctuation in the secondary electron emission current was found in MgO films from hydrolyzed sol. The instability of the ion-i…
Silica mesoporous films with low dielectric constant were successfully fabricated by a multiple step sol-gel process. The employment of inorganic/organic precursors proved very useful in preventing the film from cracking. The acid/base two-step catalysis could adjust the refractive index or porosity of the silica film…
We show that, despite the 139 possible products, tris(pentafluorophenyl)corrole is sulfonated by H 2 SO 4 in quantitative yield to a 9:1 mixture of only the 2,17- and 3,17- isomers and that its deuteration by trifluoroacetic acid-d proceeds in the order of C 3,17 > C 2,18 >> C 8,12 > C 7,13 . These results…
Molecular magnetism is an evolving discipline relying on quantum chemistry, orbitals and Hamiltonians, organic and coordination chemistries, physics, and devices. Among the exciting molecule-based magnetic systems, Prussian blue analogues occupy a peculiar position.
Abstract Thermoreversible crosslinking rubber (TRC-IR) was easily synthesized by modification of isoprene rubber (IR) with maleic anhydride followed by the addition of 3-amino-1,2,4-triazole (ATA), in solid phase. The mechanical properties of the resulting rubber were more similar to the sulfur-vulcanized rubber than…
The photophysics of several oligomers containing mixed furan, pyrrole, and thiophene heterocyclic systems is reported. The mixed systems contain three rings and five rings of the heterocycles. Comprehensive spectroscopic and photophysical data were obtained and all of the rate constants kF, kIC, and kISC were evaluate…
2-Hydroxy-6-oxo-7-methylocta-2,4-dienoate hydrolase (CumD) from Pseudomonas fluorescens IP01 hydrolyzes a meta-cleavage product generated in the cumene (isopropylbenzene) degradation pathway. The crystal structures of the inactive S103A mutant of the CumD enzyme complexed with isobutyrate and acetate ions were determi…
Occlusions of the retinal veins and arteries, associated with diseases such as hypertension and arteriosclerosis, are a major cause of severe and irreversible loss of vision. Treatments for retinal vascular diseases have been unsatisfactory owing in part to the difficulty of delivering drugs to the site of disease wit…
A new approach has been used to model optical properties of noncubic single-phase polycrystalline materials with random orientation and crystallites small compared to the resolution limit of light. This method has been applied to fresnoite (Ba 2 TiSi 2 O 8 ) and proved to provide widely adequate results to effective m…