Materials Literature
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Monovalent cations (M+ = Na+, K+, Rb+, and NH4+) and 12-crown-4 were assembled to new supramolecular cation (SC+) structures of the M+(12-crown-4)n (n = 1 and 2), which were incorporated into the electrically conducting Ni(dmit)2 salts (dmit = 2-thioxo-1,3-dithiole-4,5-dithiolate). The Na+, K+, and Rb+ salts are isost…
A series of highly ordered mesoporous gallium-containing MCM-41 molecular sieves with variable Si/Ga (100−10) ratios have been synthesized at room temperature. The synthesized Ga−MCM-41 was investigated by powder X-ray diffraction, transmission electron microscopy, thermal analysis, N 2 adsorption measurement, and 29…
Thin films of tetragonal lead monoxide have been prepared from spray pyrolytic decomposition of an aqueous solution of lead nitrate. The spray pyrolysis set-up developed for this study is also described briefly. From the structural investigations it has been found that the films generally grow with some admixture of m…
Two new one-dimensional nickel(II) complexes were synthesized and characterized: [Ni(N,N-dimethylethylenediamine)(N3)2] (1) and [Ni(2-aminoethylpyridine)(N3)2] (2). The crystal structures of 1 and 2 were solved. Complex 1 crystallizes in the monoclinic system, space group P2(1)/n with a = 10.569(2) A, b = 7.331(4) A,…
A centered icosahedral 12-coordinate samarium cluster formed by six bis(L-prolinato)nickel(II) ([Ni(pro)2]) ligands, [Sm(Ni(pro)2)6]3+, was prepared. The reaction of Sm with [Ni(pro)2] in a small excess (a 2-fold excess) and also in a large excess (even a 10-fold excess) of the latter produced the cluster. Therefore,…
Diblock copolymers of ethylene oxide and 1,2-butylene oxide, E 30 B n, with constant E-block length of 30 units and various B-block lengths ( n = 3−30) were investigated, in parallel with a series of homopoly(oxybutylene)s of similar to B-block lengths, using broad-band dielectric relaxation spectroscopy (10 -2 −10 9…
A brief review is given of electronic and transport properties of carbon nanotubes mainly from a theoretical point of view. The topics include a giant Aharonov-Bohm effect on the bandgap and a Landau-level formation in magnetic fields, absence of backward scattering except for scatterers with a potential range smaller…
Time-resolved synchrotron wide- and small-angle X-ray scattering experiments were used to investigate the crystallization behavior and microstructure development of poly(ethylene oxide) and several melt-miscible PEO blends. Model blends were prepared with both weakly interacting poly(methyl methacrylate) and two stron…
The superficial properties of different Pt/γ-Al 2 O 3 catalysts, modified by the addition of tin and/or lithium, were studied by X-ray photoelectron spectroscopy (XPS), scanning electron microscopy, BET, and 2-propanol transformation. The results obtained were correlated with the behavior of the catalysts in applied r…
The synthesis and the swelling properties of two types of hybrid hydrogels have been studied to point out the contribution of cross-linking organic−inorganic aggregates to the network formation and the water absorption. The first type consists of polyacrylamide hydrogels with embedded polyoxotungstates. The second one…
We study via density functional-based molecular dynamics the structural and dynamical properties of the rare earth silicon amorphous alloy Y_xSi_{1-x} for x=0.093 and x=0.156. The Si network forms cavities in which a Y^{3+} cation is entrapped. Its electrons are transferred to the Si network and are located in the dan…
Recently, several research groups have reported on the observation of super-large more than 5% magneto-strain effect in some non-stoichiometric Ni-Mn-Ga alloys close to 5.78% value expected from the tetragonality aspect ratio of the martensite crystal lattice. New Ni-Mn-Ga alloys showing giant magneto-strain effect di…
Step meandering due to a deterministic morphological instability on vicinal surfaces during growth is studied. We investigate nonlinear dynamics of a step model with asymmetric step kinetics, terrace and line diffusion, by means of a multiscale analysis. We give the detailed derivation of the highly nonlinear evolutio…
Nanostructured WO 3 thin films were prepared, and photooxidation of water at such films was studied in a pH 4.68 solution. The cathodic current at potentials below −100 mV versus a saturated Ag/AgCl electrode was related to the reversible intercalation of H + and/or Na + . The photocurrent onset was at ∼100 mV, and th…
Single crystal films of Gd and Nd were grown by MBE techniques using the LaMBE facility in Oxford. The thickness of the layers was 5000 Å and the mosaic spread about 0.2-0.3°. Some of the layers were hydrogenated by KTH in Stockholm to obtain the dihydride. The magnetic structures were determined using the TAS1 triple…
The isothermal crystallization kinetics of virgin, melt-mixed, and nucleated specimens of polyethylene terephthalate (PET), polypropylene terephthalate (PPT), and polybutylene terephthalate (PBT) were measured. The purpose of the study was to determine the difference in crystallization rate of PPT, which is to be comm…
Functionalization of poly(ethylene-co-vinyl acetate) (EVA) with vinyltriethoxysilane (VTEOS) has been carried out by a free-radical melt-grafting procedure in the presence of added comonomers. The influence of comonomers on silane graft yield and crosslink density has been assessed. Experiments were performed on maste…
Functional group containing MBS impact modifiers for the poly carbonate/poly(butylene terephthalate (PC/PBT) alloy were synthesized and characterized in this study. The novel MBS consisted of three layers, in which the inner, middle, and outer layers were styrene butadiene rubber (SBR) latex, polystyrene, and a copoly…
Four different p-PDA–based polyimide thin films were prepared from their respective poly(amic acid)s through thermal imidization at 400°C: poly(p-phenylene pyromellitimide) (PMDA-PDA); poly(p-phenylene biphenyltetra carboximide) (BPDA-PDA); poly(p-phenylene 3,3′,4,4′-oxydiphthalimide) (ODPA-PDA); and poly(p-phenylene…
We report on the dynamics of surface-attached polyelectrolyte (PEL) brushes under compression and varying conditions of added salt and pH. Fluctuations of the brush thickness are probed by bringing the sample in contact with a small sphere attached to the cantilever of a scanning force microscope (SFM). The noise powe…