Materials Literature
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The interest in diamond windows for the application of high power radiation technology is increasing continuously due to its outstanding thermal and opto-electronic properties. In order to analyze the surface properties of very highly polished polycrystalline diamond in the sub-micrometer down to nanometer regime, two…
Cubic boron nitride films (c-BN) were prepared by sputtering of a hexagonal BN sintered target. The films obtained were characterized by scanning electron microscopy, Infrared absorption spectra and UV-visible transmission spectra. The UV photodetetor devices of c-BN films were fabricated by photolithographic techniqu…
The Co-Cr-Mo alloy is extensively used for tribological applications, including orthopaedic components in total joint replacements. High quality diamond-like carbon (DLC) coatings on metal/alloy substrates are of great interest as they are able to protect them from severe wear and thus prolong the life span of the com…
Abstract The synthesis and characterization of the fluoropolymers poly 1a – 1d and poly 2a – 2d with pendant hydroxyl groups were examined. The polyaddition of bis(epoxide)s [2,2′‐bis(4‐glycidyletherphenyl)hexafluoropropane and bisphenol A diglycidyl ether] with dicarboxylic acids (tetrafluoroterephthalic acid and ter…
The interaction between phthalocyanine (ZnPc) and poly(ethylene oxide) (PEO) in water has been studied by dynamic laser light scattering and transient absorption and fluorescence spectroscopies. After the addition of PEO, the intensity of the transient absorption at ca. 490 nm, arising from the triplet state of the no…
Abstract The effect of mercapto‐modified ethylene vinyl acetate copolymer (EVALSH) on the rheological and dynamic mechanical properties of acrylonitrile butadiene rubber (NBR) and ethylene vinyl acetate copolymer (EVA) blends was evaluated at different blend compositions. The addition of 5 phr of EVALSH in the blends…
Several model systems for the α-carbonyl proton abstraction reaction were studied at the DFT level to examine the role of hydrogen bonding interactions in the enzyme catalytic activity of acyl-CoA dehydrogenase. Each system contains the thioester portion of acyl-CoA (CH 3 CH 2 (C O)SCH 3 ) a weakly basic COO ⊖ represe…
The effects of Ce addition on the activity of Pt/Al 2 O 3 catalysts were investigated for the wet oxidation of phenol. Platinum was impregnated on γ-Al 2 O 3 by using two different precursors: one is anionic (i.e., H 2 PtCl 6 ) and the other is cationic (i.e., Pt(NH 3 ) 4 Cl 2 ). The Pt catalysts from the former showe…
The formation of carbonaceous condensates in the atmospheres of asymptotic giant branch (AGB) carbon stars and in the nebulae of post-AGB objects occurs in a chemical environment that also contains oxygen and nitrogen. The extent of incorporation of chemical groups containing these elements in carbonaceous solids will…
A new nanocomposite based on polyaniline and MoO3 is prepared via direct intercalation of conducting polymer macromolecules. The method of preparation allows material to be obtained with peculiar electric and electronic properties.
We perform first-principles pseudopotential calculations to investigate the oxidation process by oxygen gas exposure in single-wall carbon nanotubes with a closed tip. Oxygen molecules can be initially adsorbed either on the tube cap or wall, keeping their molecular form, then, a successive transformation occurs into…
Hydrogenated amorphous carbon films were fabricated with and without hydrogen dilution in a small d.c bias-assisted plasma chemical vapor deposition system. It was found that the hydrogen dilution can reduce the sp 2 / sp 3 ratio in carbon films which results in blue shift of room temperature photoluminescence spectru…
In this paper ternary compounds ${\mathrm{GdFe}}_{12\ensuremath{-}x}{\mathrm{Re}}_{x}$ with x ranging from 1.0 to 2.4 have been synthesized and investigated by means of x-ray powder diffraction (XRD) and magnetic measurements. The compounds crystallize in the tetragonal ${\mathrm{ThMn}}_{12}$ structure with space grou…
The crystalline trinuclear cerium cluster complex [{(Ce(OBut)2}2(μ-OBut)3(μ3-OBut)2{Ce(OBut)(NO3)}] 1 has been obtained in good yield from 2 [Ce(OBut)4(thf)2], [Ce(OBut)3(NO3)] and Sn(C5H3But2-1,3)Me3 by refluxing in hexane, and was characterised by microanalysis, 1H NMR, IR and UV–Vis spectra and MS data. Its structu…
This paper describes the efficient synthesis and full characterization of rare formally zerovalent and diamagnetic monovalent pseudooctahedral niobium and tantalum complexes. The reaction of NbCl(4)(thf)(2) with 4 equiv of Na and 3.5 equiv of iPr(2)-dad (1,4-diisopropyl-1,4-diaza-1,3-diene) yields Nb(iPr(2)-dad)(3) in…
The miscibility behavior and specific interaction of phenolic resin with poly(acetoxystyrene) (PAS) blends were examined using differential scanning calorimetry (DSC), fourier-transform infrared (FT-IR) spectroscopy and solid-state NMR. This phenolic/PAS blend is fully miscible, as indicated by a single glass-transiti…
The curvature of an emulsion of CO 2 and brine stabilized with a triblock copolymer of poly(dimethylsiloxane) (PDMS) and poly(ethylene oxide) (PEO), PEO- b -PDMS- b -PEO, was inverted from H 2 O-in-CO 2 to CO 2 -in-H 2 O (C/W) by reducing the temperature. A “v-shaped” trough was observed in the interfacial tension bet…
Polyoxometalate (POM) clusters derivatized with aniline groups exhibit distinct interactions with counterions and with each other. These interactions lead to the assembly of the clusters into chains and networks upon crystallization. Two cluster types were examined, [W(6)O(25)H(AsC(6)H(4)-4-NH(2))(2)](5-) and [Mo(12)O…
Two new nonanuclear lanthanide(III)-copper(II) complexes of macrocyclic oxamide [NaPr(2)(CuL)(6)(H(2)O)(6)](ClO(4))(6)Cl small middle dot6H(2)O (1) and [NaNd(2)(CuL)(6)(H(2)O)(6)](ClO(4))(6)Cl small middle dot8H(2)O (2) have been synthesized and characterized by means of elemental analysis, IR, and electronic spectra,…
Abstract Tensile drawing and short‐term creep of ethylene/α‐olefin copolymers having bimodal (BM) molar weight distribution are studied in comparison with unimodal (UM) copolymers of similar crystallinity. The natural draw ratio and viscoelastic recovery upon unloading strongly suggest that BM copolymers have more tie…