Materials Literature
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Wetting phenomena are theoretically studied for a slit pore or slab geometry between two structured surfaces which contain stripes of lyophilic surface domains. Two different approaches are used and compared: Monte Carlo simulations of lattice gas models and minimization methods applied to effective interface models.…
The successful preparation of novel thin nanocomposite films containing continuous periodic arrays of self-assembled silver nanocrystals in a polystyrene (PS) matrix is reported in this communication. The Figure shows a photo of a thin nanocomposite Ag–PS film supported by a wire loop. The simple and rapid synthetic p…
SUMMARY In the Soom Shale, labile soft tissues have been replaced rapidly after death by authigenic clay minerals which now have an illitic composition. There are two possible pathways for this mineralization: (1) initial replacement of soft tissue by kaolinite which was then diagenetically transformed to illite; or (…
FTIR and EPR of adsorbed probe molecules were used to study Lewis acid sites in FAU and MFI zeolites with different nonframework Al content. Infrared spectra of adsorbed CO at low temperatures give information about all types of sites. The absorption bands were assigned to CO fixed on Brönsted sites, cations, and true…
Atomistic simulations using a modified generalized pseudopotential theory potential and Green's function boundary conditions were employed to determine the Peierls stress of rigid straight (a/2)〈111〉 screw dislocations for the application of shear stresses on {110}- and {112}-type planes in bcc Mo. It is found that th…
Vanadium oxide thin films with different stoichiometry have been deposited on In2O3:SnO2 (ITO) glass and Si wafer by pulsed laser deposition technique at different substrate heating or annealing temperatures and oxygen pressure. The structural properties of as-deposited and annealed VOx thin films were analyzed by usi…
Spectroscopic properties of Ho3+-doped ZnCl2-based glasses are investigated. The Ω2 value of the glass is especially large compared with those in fluoride glasses while the Ω4 and Ω6 parameters are relatively small. Decay measurements for three excited states F55, S25+F45, and F2,35+K83 were performed and multiphonon…
The past two decades have witnessed significant developments in the study of water-soluble cellulose derivatives. Numerous new water-soluble cellulosic polymers have been synthesized and studied for diversified applications including rheology modification, personal care and oilfield formulation, surface coating, collo…
The extracts of 12 plants selected on the basis of the folk-medicine reports were examined for their antibacterial effects against eight pathogenic bacteria. The n-butanol extract of Calotropis procera flowers and the aqueous extract of Eugenia caryophyllata proved to be the most effective against the bacteria tested.
Reaction of titanium butoxide and zirconium butoxide with methacrylic acid in different molar ratios results in the formation of the mixed-metal clusters Ti4Zr4O6(OBu)4(OMc)16, Ti2Zr4O4(OBu)2(OMc)14, Ti4Zr2O4(OBu)6(OMc)10, and Ti2Zr6O6(OMc)20 (OMc = methacrylate). The molecular structures of these clusters have been d…
Abstract The surface chemistry of a commercial soda‐lime silicate glass is shown to change during a long‐duration XPS experiment wherein the glass surface was exposed to the monochromatic x‐rays and low‐energy electrons (0.2–5 eV) that compensate for the charging of the surface. The atomic percentage of sodium increas…
A soft ellipsoid model for Gaussian polymer chains is studied, following an idea proposed by Murat and Kremer [J. Chem. Phys. 108, 4340 (1998)]. In this model chain molecules are mapped onto ellipsoids with certain shapes, and to each shape a monomer density is assigned. In the first part of the work, the probabilitie…
The synthesis of amino acid based dendrimers 25 (fifth generation, 32 endgroups), 30 (fourth generation, 81 endgroups), chiral dendrimer 23 (third generation, 8 endgroups) as well as core-modified dendrimers 34 and 38 by the convergent method is described. The amino acid building blocks are derived from hydroxybenzoic…
Ultrafine β‐SiC powders mixed with 7 wt% Al 2 O 3, 2 wt% Y 2 O 3 , and 1.785 wt% CaCO 3 were hot‐pressed and subsequently annealed in either the absence or the presence of applied pressure. Because the β‐SiC to α‐SiC phase transformation is dependent on annealing conditions, the novel processing technique of annealing…
Dew retted hackled long flax was treated with propyltrimethoxysilane, phenylisocyanate, and maleic acid anhydride modified polypropylene (MAA-PP). The wetting parameters of the untreated and treated flax fibers were obtained with dynamic contact angle measurements. The results showed that the treated flax fibers are l…
Abstract This investigation involves the recycling of precipitated silica-filled silicone rubber using a continuous ultrasonic reactor. The processing conditions utilized in devulcanization of the filled systems were similar to those in our previous work on unfilled systems. Significant differences were observed in de…
The monoanion of 2,6-bis(phenylamino)pyridine (HBPAP(-)) has been found to support quadruply bonded Cr(2)(4+) and Mo(2)(4+) units in Cr(2)(HBPAP)(4) (1) and Mo(2)(HBPAP)(4) (2). The corresponding dianion BPAP(2)(-) was able to stabilize the trinuclear complexes, (TBA)(2)Cr(3)(BPAP)(4) (3) and (TBA)(2)Ni(3)(BPAP)(4) (4…
Polyferrocenylsilane microspheres are readily formed under mild reaction conditions. Chemical oxidation leads to positively charged particles that undergo electrostatic self-assembly with smaller negatively charged silica microspheres, which leads to composite superstructures (see Figure), whereas pyrolysis leads to s…
This paper presents the results of a large-scale atomistic simulation study of the process of emission of multiple dislocations in Al. We use embedded-atom method potentials based on ab-initio data and molecular statics and dynamics techniques to study the configuration of the crack tip as the dislocation emission pro…
Sodium sulfonate-functionalized poly-(ether ether ketone)s derived from Bisphenol A with a degree of sulfonation up to 2.0 were synthesized by aromatic nucleophilic polycondensation of various amounts of 5,5′-carbonylbis(2-fluorobenzenesulfonate) (1), 4,4′-difluorobenzophenone (2) and Bisphenol A (3). Copolymers showe…