Materials Literature
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Passive films formed on Fe-18Cr alloy in a borate buffer solution were studied using impedance spectroscopy and photoelectrochemical response. The passive film was composed of an inner oxide and covering hydroxide layer. Both layers exhibited n-type semiconductor properties with an optical bandgap energy, E g , of 3.4…
Water soluble star polymers consisting of a porphyrin center and four poly(oxazolines) arms such as Por-[poly(methyloxazoline)]4 (1), Por-[poly(ethyloxazoline)]4 (2), Por-[poly(methyloxazoline-co-ethyloxazoline)]4 (3) and Por-[poly(methyloxazoline)-b-poly(ethyloxazoline)]4 (4) were synthesized and used for the investi…
The density, surface tension, and viscosity of the melts from the PbO‐B 2 O 3 ‐SiO 2 system have been measured at temperatures in the range 1073–1473 K. The effect of composition on these properties was also investigated. The density of the melt was found to increase linearly with increasing PbO content. Molar volume…
Abstract The influence of the alloying elements on the interface reactions of zinc coatings during the galvanization process was examined. These reactions affect the crystallization and the structure and properties of the outer layer of the coatings. Depending on the type and concentration of the alloying additions in…
A novel technique for the formation and lift-off of thin porous silicon films from starting substrates in a single step by electrochemical etching in hydrofluoric acid-based solutions is described. Lift-off or separation of porous silicon (PS) film occurs under specific sets of current density and HF concentration, wh…
Nanocrystalline cobalt oxide, Co(3)O(4), monoliths exhibiting hierarchical bimoidal porosity have been prepared by nanocasting of porous silica monoliths.
In recent years, sisal fibres have become a promising reinforcement for composites because of their low cost, low density, high specific strength, high specific modulus, easy availability and renewability. However, the poor adhesion between the hydrophilic sisal fibre and the hydrophobic thermoplastic matrices has adv…
The monomeric titanium(IV) hydroxide complex, LTi(OH)(LH(3)= tris(2-hydroxy-3,5-di-tert-butylbenzyl)amine), which is sterically inhibited from condensation to a mu-oxo dimer, cannot be prepared by hydrolysis of the alkoxide, with K(eq)= 0.012 for hydrolysis of the titanium methoxide in THF.
Lead iron niobate [Pb(Fel/2Nb1/2)]O3 (PFN) are synthesized by using precursor method. Three different sintering temperatures (1000, 1040 and 1100°C) are selected to optimize the PFN processing technique. X-ray powder diffraction studies confirm the formation of single-phase perovskite PFN. The scanning electron micros…
The intrinsic iron(III) impurity center in polycrystalline lead titanate was investigated by means of high-frequency electron paramagnetic resonance (EPR) spectroscopy in order to determine the local-environment sensitive fine structure parameter D. At a spectrometer frequency of 190 GHz, spectral analysis of a powder…
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We recently reported on the controlled formation of highly stable metal hydroxide nanoparticles. Growth control and stabilization of particles were achieved by performing hydrolysis and polycondensation reactions of polymer-complexed metal cations, the polymers being double hydrophilic block copolymers (DHBCs). The pr…
Pulsed-plasma chemical vapor deposition was used to deposit thin films from four different organosilicon precursors using water as the oxidant. The precursors varied in structure, chemical composition, and type of organic substituent. Differences in film structure were observed based on precursor structure and type of…
This review concentrates on our recent achievements that have enabled us to construct the novel organic/inorganic-hybridized materials. In a natural system, biomineralization processes are initiated where organic elements meet inorganic counterparts. This situation implies that both elements of organic and inorganic s…
We report a facile chemical route for the synthesis of monodisperse nanocrystals of various metal sulfides (PbS, Cu(2)S, and Ag(2)S) and their assemblies into nanocrystal superlattices (NCSs); the sulfides NCSs were precipitated by adding ethanol to nanocrystal colloids, which were obtained directly by a reaction betw…
Polymer chemistry is very well suited for combinatorial approaches since a large parameter space has to be covered during synthesis, processing, blending or compounding. Moreover, a large variety of parameters need to be screened in order to evaluate structure–property relationships and to accelerate the design and de…
A method to synthesize boron nitride coating on the surface of carbon nanotubes (nanofibers) without damaging the tube walls has been developed. A reaction between boric acid and ammonia was performed at moderate temperatures on the surface of carbon nanotubes to form boron nitride (BN) coatings. The surface structure…
Abstract Air oxidation of Fe was compared with and without a pre‐exposure to water vapour. Angle‐resolved x‐ray photoelectron spectroscopy (ARXPS) and QUASES ™ were used to determine the thickness of the oxide layer formed and its composition. The extent of oxidation was found to be much less if the surface was pre‐ex…
The ternary II–II′–VI nanoclusters [(N,N′-tmeda)5Zn5Cd11E13(EPh)6(thf)n] (1, E = Se, n = 2; 2, E = Te, n = 1) have been synthesized by the reaction of bis(trimethylsilylchalcogenolate)zinc(II) complexes in the presence of PhESiMe3 and solubilizing phosphine ligands. Structural characterization of the complexes by X-ra…
During the past decade, numerous Mn2+-dependent protein serine, threonine and/or tyrosine phosphatases (O-phosphatases) from prokaryotes have been characterized. Based on their amino acid sequences, they belong to PPP, PPM or PHP superfamilies. Both the PPP and PPM families of protein phosphatases are metalloenzymes w…