Materials Literature
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With the aid of several demonstration experiments, it is shown how a stirred scalar mixture relaxes towards uniformity through an aggregation process. The elementary bricks are stretched sheets whose rates of diffusive smoothing and coalescence build up the overall mixture concentration distribution. The cases studied…
Abstract The behavior of ammonia adsorption was studied on various types of surface-treated active carbon (HNO3-AC, H2SO4-AC, HCl-AC, NaOH-AC, CuO-AC, and H2-AC) under 0–75 kPa and 323–473 K. Amount of ammonia adsorption on active carbon was increased by the surface oxidation through acid treatment or metal nitrate de…
A new, three-electrode, hybrid-aligned nematic (HAN) liquid crystal (LC) device for fast response applications is described. The three-electrode configuration generates electric field horizontally and vertically which alternately turn the LC cell on and off. The fast response is realized with both the turn-on and turn…
Abstract The effects of soybean oil (SO) and epoxidized soybean oil(ESO) as biodegradable plasticizers for poly(3‐hydroxybutyrate‐ co ‐3‐hydroxyvalerate) (PHBV) were studied using thermal and mechanical analyses. PHBV/SO and PHBV/ESO blends were prepared by evaporating solvent from blend solutions. The levels of addit…
Abstract For applications demanding the best high temperature aging performance with lowest compression set, polymers are crosslinked with peroxides. The carbon-carbon bonds that are formed are more thermally stable than crosslinks containing sulfur atoms generated by conventional vulcanization by sulfur- and sulfur b…
The study involved the thermal degradation of phenolic resins in controlled atmospheres (inert and oxidizing). Its aim was to characterize volatile organic compounds (VOC) and inorganic compounds released during heat treatment. The methods used were thermogravimetry coupled with thermodesorption/gas chromatography/mas…
Abstract Although many low‐valent ( III , IV ) actinide (An) ions are known to form coordination complexes with the α‐2 isomer of the lacunary Wells−Dawson polyoxoanion, [P 2 W 17 O 61 ] 10− , there is little structural information about the An−O interactions, particularly in solution. We have probed the An−O coordina…
The use of XLPE as the insulation for power cables has grown steadily since it first introduction more than 30 years ago. Today XLPE is rapidly becoming the preferred insulation system for even the highest transmission voltages. This preference is due to the high reliability, low dielectric losses, and low environment…
Lithium haloborate glasses in the form (70 – x) B2O3–30BaF2–xLiX where x = 0, 5, 10, 15 and 20 mol% and X = F, Cl and Br were prepared. The density, molar volume, IR spectra and elastic moduli of the obtained glasses were investigated. The glasses mainly composed from BO3, BO2F triangles and BO4, BOF3 tetrahedra struc…
Abstract This paper studied the polymerization‐induced phase separation phenomenon (spinodal decomposition) in a model binary polymer solution under a linear spatial temperature gradient for the purpose of fabricating anisotropic polymeric materials by using mathematical modeling and computer simulation. Reaction kine…
Abstract The main models proposed in the literature to describe pressure‐induced amorphization (PIA) are briefly reviewed, with special emphasis on the kinetic aspects of PIA. The high potential of Raman spectroscopy for experimental studies on PIA is highlighted and illustrated by the results obtained for zirconium t…
A pegmatite from Diethensdorf, Saxonian Granulite Massif, Germany, contains fine-grained aggregates of at least three different varieties of niobian rutile and a (W, Sc)-rich ferrocolumbite. In addition, rutile 1 occurs as larger grains. Electron microprobe analyses of niobian rutile gave compositions close to the gen…
Abstract Biodegradable polyesters, poly(butylene succinate adipate) (PBSA), poly(butylene succinate) (PBS), poly(ethylene succinate) (PES), poly(butylene succinate)/poly(caprolactone) blend (HB02B) and poly(butylene adipate terephthalate) (PBAT), were evaluated about degradability for enzymatic degradation by lipases…
New metal-free (5, 8) and metallophthalocyanines (6, 9) containing four diazatetrathiamacrobicycles or crosswise-disubstituted attached with two nitro and two macrobicyclic groups were synthesized by cyclotetramerization of 7,8-dicyano-4,11,22,23-tetrathia-1,14-diazapentacyclo[12.10.10.05,10.016,21.026,31]tetratricont…
We have explored the use of lyotropic chromonic liquid crystals (LCLCs) as promising materials for optical compensators for liquid crystal displays. We used aqueous solutions of disodium cromoglycate in the range of concentrations that yield a chromonic N phase. The N phase is aligned by rubbed polyimide layers giving…
Abstract The large quantity of moisture in wood‐flour may lead to the deterioration of the cell structure of foamed plastic wood‐flour composites in terms of cell size, non‐uniformity, and poor surface quality. Since these anomalies can cause poor mechanical properties of the foamed composites, the removal of the mois…
To probe the effect of junction point functionality in miktoarm star block copolymer architecture on chain conformation and morphology, a series of A n B n miktoarm star copolymers where A arms are PS blocks and B arms are PI blocks were investigated. The overall series including a diblock and the star block copolymer…
Electronic properties of a -Se as a function of the source (boat) temperature and as a function of As (up to 0.7%) and Cl (up to 40 wt ppm) concentrations have been experimentally studied by carrying out conventional and interrupted field time-of-flight (IFTOF) transient photoconductivity measurements that provide acc…
Alloying zinc coatings with elements such as magnesium and titanium increases the corrosion resistance in industrial tests. Based on the fundamental mechanism of cathodic delamination, a simple concept how alloying zinc with specific elements might improve its resistance to cathodic delamination is presented in this p…
The beta-ketoacyl-acyl carrier protein synthases are members of the thiolase superfamily and are key regulators of bacterial fatty acid synthesis. As essential components of the bacterial lipid metabolic pathway, they are an attractive target for antibacterial drug discovery. We have determined the 1.3 A resolution cr…