Materials Literature
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The synthesis and liquid crystalline properties of a new series of amides (series 2a-f,3a-d and 4a-d) incorporating pyridine and 1,3,4-thiadiazole rings are reported. No homologues of the series 2 show mesomorphic properties. In the series 3 only the highest homologues (3d) displays an enantiotropic SmA mesophase; the…
Corrosion of mild steel under aerobic conditions in the presence of a monoculture of aerobic bacteria (Pseudomonas fragi K [P. fragi K]) has been studied in a continuous flow system using electrochemical impedance spectroscopy (EIS). P. fragi K grown in Luria-Bertani (LB) medium causes a 10- to 20-fold decrease in the…
A series of peroxy oligomers has been synthesized on the basis of pyromellitic dianhydride and tetrachloroanhydride of pyromellitic acid by condensation with polyethylene glycols and tert-butylhydroperoxide. The resulting oligoesters contain two types of functional groups: carboxylic—which can participate in ionic rea…
The chemical exfoliation characteristics of phlogopite samples taken from Sivas - Yıldızeli-Karakoç (Turkey) ore were investigated. H2SO4, HCl, HNO3, H3PO4 and H2O2 solutions at varying concentrations were tested for chemical exfoliation and the best reagent for this purpose was determined to be hydrogen peroxide. In…
The role of liquid phase in the enhancement of the PTCR (positive temperature coefficient of resistance) effect in (Ba 0.7 Sr 0.3 )TiO 3 (BST) with the addition of AST (4Al 2 O 3 · 9SiO 2 · 3TiO 2 ) is investigated in this paper. The AST–BST samples were characterized with optical microscopy, transmission electron mic…
The thermal conductivity, thermal expansion, mechanical properties at low strain rates and dynamic mechanical properties of a collection of crosslinked closed cell polyethylene foams manufactured by a high pressure nitrogen solution process have been studied as a function of the cell size. The main mechanisms that inf…
The project consisted of two phases. In the Phase I study, the relative corrosiveness of the two salts [magnesium chloride (MgCl2) and sodium chloride (NaCl)] were examined by SAE J2334 test and ASTM B117 test. In the Phase II study, SAE J2334 test and NACE TM-01-69 test (as modified by the Pacific North States) were…
The crystal structure of the title complex, [Cd(tsac)2(py)3], has been determined by single crystal X-ray diffractometry. It crystallizes in the monoclinic space group C2/c with Z = 8.The Cd 2+ cation is at the center of a square- bipyramidal environment, equatorially coordinated to two thiosaccharinate anions through…
Gallium oxide films 20 Å in thickness were deposited onto GaAs substrates in ultra high vacuum (UHV) via e-beam evaporation from a monolithic high-purity source. The substrates were prepared by molecular-beam epitaxy and transferred to the oxide film deposition site in a wholly UHV environment. The Ga2O3−x films were…
Abstract Conventional sulfur-cured, gum natural rubber vulcanizates of various crosslink densities were prepared. Dumbbell test pieces with and without edge precuts were tested in uniaxial tension. Relative strengths of the different vulcanizates depended on cut size. Lightly crosslinked specimens exhibited an abrupt…
Because of the diversity of their compositions and structures, and the treatments needed to render them active, heterogeneous catalysts present a major challenge in structural characterisation. Electron microscopy provides textural and structural information at the scale of the individual particle. We have been able t…
Author: Bill, J. et al.; Genre: Journal Article; Issued: 2002-05; Keywords: MPI für Intelligente Systeme; Ehemalige Abt. Aldinger; 3-al_2002; template-induced deposition; self-assembled monolayers; ceramic materials; Title: Deposition of ceramic materials from aqueous solution induced by organic templates
Author: Zhang, L. et al.; Genre: Journal Article; Issued: 2002-05; Keywords: MPI für Metallforschung; Ehem. Abt. Gao; grain boundary grooving; grain boundary diffusion; surface diffusion; polycrystalline thin films; Title: Coupled grain boundary and surface diffusion in a polycrystalline thin film constrained by subst…
During the last few years, several genes, such as pap, bgl and flhDC, have been shown to be coregulated by the histone-like nucleoid-structuring (H-NS) protein and the cyclic AMP-catabolite activator protein (cAMP/CAP) complex, suggesting an interaction between both systems in the control of some cellular functions. I…
The pyruvate dehydrogenase multienzyme complex (PDHC) was found to be upregulated by osmotic stress in the osmotolerant pathogen Staphylococcus aureus. Upregulation was detectable in the levels of both activity and protein and was judged to be about fourfold when sodium chloride was used to adjust the water activity (…
To enable the simultaneous determination of both the speed and extent of liquid absorption in cotton fabrics, we have developed a radial, horizontal wicking experiment. The initial part of the absorbed mass versus time profile is linear, which allows us to determine the wicking rate. After a given time, a constant mas…
Although in recent years resonant optical nonlinearities in quantum confined silicon generated significant interest, no experimental work has been dedicated to the nonresonant regime, which is the range of interest for optical switching applications. In this article we report a systematic investigation on the differen…
Cu bicrystals with a ∑ = 19a {331} grain boundary, grown by the Bridgman technique, have been doped with 14, 24, 25 and 64 at.ppm Bi. After annealing between 500 and 800°C the segregation was quantified using energy-dispersive X-ray spectroscopy in a dedicated scanning transmission electron microscope. Grain-boundary…
To make a nondestructive measurement of tritium retained on/in materials surfaces, conversion efficiency of β-rays to characteristic X-rays in an argon atmosphere has been examined. For this purpose, various tritium-containing graphite plates were prepared at first by ion implantation. After the tritium implantation,…
Recently, we developed a new method for making spherical poly(α-methylstyrene) (PαMS) mandrels. The process utilizes a small amount (<0.1wt%) of high-molecular-weight poly(acrylic acid) (PAA) in the suspending medium, which substantially increases the interfacial tension during curing relative to methods using poly(vi…