Materials Literature
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Hydrophobically surface-modified membranes were prepared by adding a fluorine-containing graft copolymer into a microphase-separated membrane consisting of poly(dimethylsiloxane) (PDMS) and poly(methyl methacrylate) (PMMA). This study focuses on the effects of surface characteristics and microphase separation of the s…
The condensation of sodium 2,6-diformyl-4-X-phenolate (X = Cl, CH3) with the reduced 1 ∶ 1 Schiff base of 2,2′,2″-tris(aminoethyl)amine (tren) and 2-formylfuran (or benzaldehyde) followed by in situ transmetallation with copper(II) perchlorate results in the production of four novel tetranuclear copper(II) complexes o…
Adsorption of collagen on polystyrene (PS) and plasma-oxidized PS (PSox) was investigated using atomic force microscopy (AFM) as the main tool. The extent of alteration produced by the AFM tip upon scanning at controlled loading forces in water was used to obtain semiquantitative information on the properties of the i…
With XRD, FTIR, CHN, ICP, and DTA/TGA techniques, ionic interactions in the forms of cation replacement/incorporation in basal layers and anion exchange/insertion in the interlayer space have been investigated. The crystallite size is increased significantly, whereas basal spacing is reduced when Co 2+ cations or both…
In alumina and especially chromia forming alloys containing RE's in form of oxide dispersions the size and distribution of the RE is of equal importance for obtaining optimum oxidation properties as the actual type (Y 2 O 3 , La 2 O 3 , CeO 2 ) and/or exact amount (0.1-1 wt.-%) of the dispersion. In conventional cast…
The oxidation of high purity polycrystalline nickel was studied at 700 °C under flowing oxygen. For 1 μm thick oxide scale, the microstructure is cellular. For 3 to 30 μm thick oxide scales, rounded oxide platelets are observed on the scale surface. There is a large effect of substrate orientation. The scale is duplex…
The crystal structure of a new high-temperature phase of nitric acid dihydrate, HNO(3).2H(2)O, has been determined at 225 K by single-crystal X-ray diffraction. The H atom of the nitric acid is delocalized to one water molecule, leading to an association of equimolar NO(3)(-) and H(5)O(2)(+) ionic groups. The asymmetr…
2-Diformylmethylene-1,3-diselenole was prepared and condensed with dithiolium phoshonium bromides and dithiolium phosphonates in the presence of base to give dendralene-type vinylogs of TTF bearing a 1,3-diselenole moiety. The electrochemistry of these dendrimers was studied. SEEPR measurements were also carried out.…
A supramolecular templating approach to the preparation of crystalline mesoporous metal oxides using inorganic colloidal nanoparticles as building blocks is presented. The nanoparticles are used to form a mesostructured material with a triblock copolymer surfactant as the templating agent and with a tungstate salt as…
The enthalpies of oxidation of CaMnO 3 - δ, Ca 2 MnO 4 - δ, and SrMnO 3 - δ have been determined by in situ oxidation in a high-temperature adiabatic calorimeter. CaMnO 3, Ca 2 MnO 4, and SrMnO 3 were synthesized by the EDTA precursor or the ceramic method, and partly reduced materials were prepared by topotactic redu…
Ion-pair formation between carboxylate anions on particle surfaces and tetraoctylammonium cations caused the phase transfer of well-characterized, water-soluble gold nanoparticles into an organic phase. Stepwise extraction procedures demonstrated for the first time that the initially fractionated solution included gol…
The use of polycarbonates as thermally decomposable, sacrificial materials for the formation of microchannels is presented. Polycarbonates decompose in the temperature range of 200-300 °C. Two polycarbonates, polyethylene carbonate and polypropylene carbonate, have been used to fabricate microchannels in three differe…
We show that it is possible to perform full microscopic calculations of the phonon-assisted and no-phonon radiative transitions in silicon nanocrystals. These are based on a tight-binding Hamiltonian for the electron and electron-phonon part together with a valence force-field model for phonons. We predict an unexpect…
Theoretical investigations have been carried out to explore the possibilities of Li + ion intercalation or insertion through the side-wall or through the cap region of carbon nanotubes. Hartree−Fock(HF), MP2 and density functional (DFT) theories with minimal to extended basis sets were used to examine simple models of…
Resol type phenolic resin/layered silicate nanocomposites (RPLSNs) are prepared by melt intercalation using various layered silicates such as sodium montmorillonite (MMT) and ω-amino acid modified montmorillonites (C3M, C6M, and C12M). The most hydrophilic MMT is the most compatible with the resol type phenolic resin…
The thermal oxidation of metals by water vapour and by oxygen is compared and several ideas are advanced to explain the differences often observed. The incorporation of hydroxyl ions in the oxide is shown to be of importance, but possible only if vacancy or interstitial oxide defects are present. The decomposition rat…
Current proposals for the catalytic mechanism of aspartic proteinases are largely based on X-ray structures of bound oligopeptide inhibitors possessing nonhydrolyzable analogues of the scissile peptide bond. However, the positions of protons on the catalytic aspartates and the ligand in these complexes have not been d…
Femtosecond pump−probe transient spectroscopy is used to compare the time dependence of the bleach recovery of CdSe nanorods with that of nanodots. In the quantum dots the bleach spectrum evolved rapidly to its characteristic shape, while in the nanorods, the higher energy exciton states are first populated within the…
Thermal decomposition pathways of our recently prepared hydrotalcite-like compounds Mg 1 - x Al x (OH) 2 (NO 3 ) x · n H 2 O in x = 0.20−0.34 ( J. Phys. Chem. B 2001, 105, 1743−1749) have been investigated with XRD, DTA, TGA, FTIR, and combined TGA/FTIR techniques. It has been found that, unlike those in carbonated hy…
Vanadium oxide nanotubes have been formed from the layered vanadium oxide precursor V 2 O 5+ δ [C 12 H 25 NH 3 ]. Both the precursor and tubes have been characterized. The black nanotubes have a relatively low thermal stability in oxygen, being oxidized to V 2 O 5 below 200 °C. A new manganese vanadium oxide nanotube,…