Materials Literature
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A new series of supramolecular architectures based on Keggin polyoxometalates (POMs): (Hbpy)3[PMo12O40]·2.2H2O (1), (H3/4bppy)4H2[PMo12O40]·3H2O (2), (Hbppy)4H2[SiW12O40]·3H2O (3) and (Hppy)4H2[SiMo12O40] (4) (bpy = 4-(5-chloropyridin-2-yl)pyridine, ppy = 4-(5-phenylpyridin-2-yl)pyridine and bppy = 4-(5-(4-bromophenyl…
The first azo dye that gels from its aqueous solution was synthesized and its moist hydrogel was investigated with electron microscopy and atomic force microscopy; the anionic azo dye in aqueous solution forms a hydrogel on cationic surfaces even at concentrations 50 times below the minimal gelation concentration.
Electrochromic hydrated nickel oxide and nickel vanadium oxide thin films were deposited by reactive dc magnetron sputtering. Optical modulation was effected by insertion and extraction of protons. The proton diffusion coefficient during the insertion/extraction process was determined by galvanostatic intermittent tit…
Ca2CoTeO6 and Sr2CoTeO6 double perovskites have been prepared as polycrystalline powders by solid state reaction, in air. These materials have been studied by X-ray, neutron powder diffraction (NPD) and magnetic measurements. At room temperature, the crystal structure is monoclinic, space group P21/n for both compound…
Shear-induced crystallization behavior of three grades of PB-1 having different molecular weights and breadths of molecular weight distribution was investigated by means of rotational rheometry covering a shear rate range of 0.0001 up to 0.3 s-1 and temperatures between 99 °C and 107 °C. The up-shoot in viscosity afte…
Methods for the preparation of novel carbon-rich materials for use in electronic devices, lithium batteries or possible hydrogen storage applications are presented.
Second harmonic generation (SHG) has been obtained in a sample of Ga5Ge20Sb10S65 glass submitted to a thermal poling treatment. An original characterization method is used for the determination of the induced second-order nonlinear profile. A reproducible chi(2) susceptibility of 4.4 +/- 0.4 pm/Volt was achieved for s…
Polymeric metal diazolates typically appear as insoluble and intractable powders, the structure of which could only be retrieved by the extensive use of ab-initio X-ray powder diffraction (XRPD) methods from conventional laboratory data. A number of selected examples from the metal pyrazolate, imidazolate, pyrimidin-2…
Densified multiwalled carbon nanotube (MWNT)–BaTiO3 composites were successfully fabricated through a spark plasma sintering (SPS) method. The influences of sintering temperature, annealing time, and the content of carbon nanotubes on the densification of composites were studied in detail. The morphology of fracture s…
We have developed high-current density field emission sources using arrays of multiwalled carbon nanotube bundles. The field emission behavior of a variety of lithographically patterned array geometries was investigated and the arrays of 1-μm and 2-μm-diameter nanotube bundles spaced 5μm apart (edge-to-edge spacing) w…
To improve the labeling efficiency of a low-density lipoprotein (LDL)-based photosensitizer (PS) for achieving high probe to protein payload, a tetra-t-butyl silicon phthalocyanine bearing two oleate moieties at its axial positions, SiPcBOA, is designed and synthesized. Using this novel strategy, SiPcBOA reconstituted…
Near-atomic resolution TEM imaging has been successfully applied to determine the stacking defect structures in kaolin minerals, especially kaolinite. The specimen studied is from the middle stage of the depth-related kaolinite-to-dickite transformation in a sandstone reservoir. Several high-quality images were record…
The study of alloy 22 was undertaken in several selected mixed nitrate/chloride ( NO 3 − ∕ Cl − ) electrolytes with chloride concentrations [ Cl − ] of 1.0, 3.5, and 6.0 molal with [ NO 3 − ] ∕ [ Cl − ] ratios of 0.05, 0.15, and 0.5 at temperatures up to 100°C. The repassivation potentials increased with an increase i…
Three new one-dimensional coordination polymers [Zn8S(SC6H5)14.C12H10N2](1), [Zn7CoS(SC6H5)14.C13H14N2](2) and [Zn8S(SC6H5)14.C13H14N2](3) have been prepared containing penta-supertetrahedral clusters and linear crosslinking dipyridyl ligands; the two complexes show optical transitions with band gaps of approximately…
Fluorinated single walled carbon nanotubes (SWNTs) undergo a facile Diels-Alder [4 + 2] cycloaddition with a range of dienes resulting in a C ratio substituent ratio between 20 ratio 1 to 32 ratio 1; IR, Raman, AFM and (13)C NMR characterization are consistent with sidewall functionalization.
Novel small contact fabrication technologies were proposed to realize reliable high density 256Mb PRAM(phase change memory) product. Introducing the 2-step CMP (chemical mechanical polishing) process and the ring-shaped contact structure, the contact area distribution was greatly improved even at the smallest contact…
Aligned nanofibers with inner-helical mesoporous silica were synthesized using chiral gelator as template under basic conditions and a shear flow.
We describe a method for producing blue light-emitting interfused CdSe//ZnS (QE up to 60%) nanocrystals and report the good performance of an electroluminescent device which uses them (external quantum efficiency approximately 1.5 cd A(-1)).
The biodegradability of oriented fibers made of polyhydroxybutyrate (P(3HB)) and its co-polymer with beta-hydroxyvalerate (P(3HB-co-3HV)) was investigated in buffer solutions and in biological media in vitro and in vivo. The fibers of both polymer types demonstrated resistance to hydrolytic degradation in buffer solut…
Highly efficient, selective and recyclable palladium catalyst systems for hydroesterification of styrene and vinyl acetate were realized by using 1,2-bis(di-tert-butylphosphinomethyl)benzene as ligand and polymeric sulfonic acids of limited SO(3)H loadings as promoter.