Materials Literature
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Abstract A series of reduced-charge montmorillonites with cation exchange capacities of 89, 73, 49 and 29% of the starting mineral was prepared from a Li-saturated smectite (Kriva Palanka, Republic of Macedonia) by heating at 110, 130, 160 and 300 ° C for 24 h (samples KP110 – KP300, respectively). Hydration propertie…
The control of relative humidity is generally recognized as an important consideration in the proper storage and display of paper materials. However, the amount that the humidity can fluctuate and the rate at which it can change without causing damage are still unknown. In this study, samples of cotton filter paper (W…
Cavitation is an effective physical mechanism for concentrating mechanical energy. Accordingly, it has wide applications in such diverse fields as sonochemistry, in which chemical reactions are initiated or accelerated, or in the electronic component cleaning industry in which particles (and other materials) are remov…
Specimens of the peritectic alloy Cu–10 wt-%Sn were subjected to various cooling rates typically observed in industrial casting processes. Some of the specimens were quenched immediately after the end of solidification to avoid further solute homogenisation of the dendrite structure during cooling to room temperature.…
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…