Materials Literature
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The effect of sodium N,N‐diethyl dithiocarbamate (SDEDTC) on the corrosion of carbon steel in 0.5mol/L hydrochloric acid (HCl) solution was studied using weight loss, potentiodynamic polarisation curves and impedance measurement methods. Experimental results revealed that SDEDTC acted as an inhibitor in acid environme…
Magnetic susceptibilities (χ M ) of three kinds of 3-(aryl-substituted)-1,5-diphenyl-verdazyl radical crystals (aryl: 4-fluorophenyl ( p -FPDV), 4-pyridyl ( p -PyDV), and 3-pyridyl ( m -PyDV)) have been measured between 1.8 and 300 K, showing a broad maximum T max at 200, 272, and 157 K, respectively. The values of T…
Cyclic deformation behaviour of Ti-5at.%Al single crystals oriented for [21 10] was investigated in the total (i.e. elastic + plastic) axial strain amplitude from 0.195% to 0.798% at room temperature in air. The crystals displayed an initial cyclic hardening followed by a striking softening period, and then a saturati…
Abstract Condensation reaction of 3,6-diphenylphthalonitrile and 2,3-dicyano-5,6-diethyl-1,4-pyrazine employing the modified lithium method has efficiently produced the novel donor-acceptor phthalocyanine derivatives having adjacently-fused pyrazine rings.
Perovskite lead hafnate (PbHfO 3 , PH) nanoparticles that were free from halides and organics were synthesized via the oxidant peroxo method. Stoichiometric amounts of hafnium nitrate (HfO(NO 3 ) 2 ) and lead nitrate (PbHfO 3 ) were dissolved in a diluted hydrogen peroxide (H 2 O 2 ) aqueous solution, which was slowly…
Abstract Fluoropolymer thin films have been deposited on (100)‐oriented single‐crystal silicon substrates via argon plasma sputtering of a poly(tetrafluoroethylene) (PTFE) target and plasma polymerization of 1H, 1H, 2H‐heptadecafluoro‐1‐decene (HDFD). The surface composition and molecular structure of the deposited fl…
This paper presents the results of a project aimed at the development of reliable corona-suppression systems for high voltage rotating machines. These systems are based on both conducting and semi-conducting dry and B-stage tapes as well as paints of different resistivity. Three groups of anti-corona systems were deve…
A series of aliphatic polyacetamidines (1) with the common structure [(CH2)mNC(CH3)NH]n was synthesized by the phenol-catalyzed melt polycondensation reaction of various aliphatic diamines with triethyl orthoacetate. The resulting polyacetamidines were characterized by 1H and 13C NMR spectroscopy. It could be sho…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTCylindrical Lamellar Habits in Monodisperse Centrally Branched AlkanesH. M. White, I. L. Hosier, and D. C. BassettView Author Information J.J. Thomson Physical Laboratory, University of Reading, Reading RG6 6AF, UK Cite this: Macrom…
Abstract It is now well established that protein adsorption constitutes the first step of the mechanism leading to biofilm formation, which is a precursor of the biofouling. Biofouling is a major problem for any activity in seawater. In order to improve our basic knowledge of the biofilm formation mechanism, the role…
Abstract The bonding and electronic structure of surface atoms is most often studied by XPS, where the energy shift of a photoelectron peak can be ascribed to a change in the chemical environment. Because three atomic levels are involved in the Auger emission process, the use of Auger spectroscopy to obtain this infor…
Magnetic domain walls in Nd2Fe14B have been examined using a series of energy-filtered Fresnel images in the field emission gun transmission electron microscope (FEGTEM). We describe the changes in the intensity distribution of the convergent wall image as a function of defocus, foil thickness and domain wall width. T…
A ligand-cation charge transfer band was observed in the region of 360–400 nm in the Eu 3+ luminescence excitation spectrum of europium 3,4-pyridine-dicarboxylates, but was absent in the spectra of europium 2,6-and 2,3-pyridine-dicarboxylates. This band is due to noticeable energy transfer through a charge-transfer st…
An isocitrate dehydrogenase (ICDH) with an unique coenzyme specificity from Acidithiobacillus thiooxidans was purified and characterized, and its gene was cloned. The native enzyme was homodimeric with a subunit of M(r) 45000 and showed a 78-fold preference for NAD(+) over NADP(+). The cloned ICDH gene (icd) was expre…
A new phosphate, Ca 9 FeD(PO 4 ) 7, with a whitlockite-like structure was synthesized by treating Ca 9 Fe(PO 4 ) 7 with D 2 at 820 K. Mössbauer spectroscopy showed that the oxidation state of Fe in Ca 9 FeD(PO 4 ) 7 is +2. Ca 9 FeD(PO 4 ) 7 was paramagnetic in a temperature range from 5 to 300 K with an effective magn…
Crystallization under shear of many different polypropylenes has been studied using a fiber pull-out device. It appears that growth can be considerably enhanced by flow. The best correlation is obtained with weight average molecular weight. Modeling the flow pattern gives access to the mechanical parameters at the gro…
Abstract Gas diffusion electrodes for electrochemical devices frequently consist of polytetrafluroethylene (PTFE) and carbon black‐supported catalysts. The hydrophilic or hydrophobic character determines the wetting behaviour, which is important for media transport in the gas diffusion electrodes. The main components…
A sol–gel‐derived Pb(Mg 1/3 Nb 2/3 ) 0.7 Ti 0.3 O 3 (PMNT) thin film was prepared using spin coating and a PbO cover coat technique. The amount of lead excess in the precursor solution had significant effects on the phase development and microstructure of the PMNT film. The PbO cover coat proved to be effective on sup…
The propagation of thermoelastic waves and phase-transition fronts is considered in a unified manner on the basis of thermodynamic consistency conditions following from the thermodynamics of discrete systems. Distinct consistency conditions are used in the bulk (for thermoelastic waves) and at the phase boundary (wher…
Various 2,2‘-bipyrroles N -substituted with alkyl, alkylsulfonate, or alkylammonium moieties have been anodically coupled to polymers. The polymers were characterized by cyclic voltammetry, UV−vis and FTIR spectroscopies, EQCM, and in situ conductivity. Coupling of dipyrroles instead of pyrroles minimizes the introduc…