Materials Literature
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Starting from B, B ‘, B ‘ ‘-triethynylborazine ( 1 ), an easy construction kit for highly durable Si−B−C−N ceramic materials is presented. Hydrosilylation of 1 with HSiRCl 2 (R = Cl, Me, Ph) using Pt/C as catalyst results in the novel precursor molecules 2 and 3 . Subsequent linking reactions with MeNH 2 or hydrogenat…
The ring-opening multibranching polymerizations of 1,6-anhydro-β- d -glucopyranose ( 1 ) and 1,6-anhydro-β- d -galactopyranose ( 2 ) have been studied in order to synthesize hyperbranched polysaccharides. The solution polymerization in propylene carbonate and the bulk polymerization of 1 and 2 using a thermally induce…
High-temperature neutron diffraction (ND) experiments have been carried out in two representative members of the Li 3 x La 2/3 - x TiO 3 series ( x = 0.067 and 0.167), to analyze the influence of temperature on the perovskite structure. In the orthorhombic Li-poor ordered member Li 0.2 La 0.6 TiO 3 ( Cmmm space group)…
Steady-state and time-resolved photoluminescence spectroscopy are used to examine the photoluminescent properties of nanocrystal-polymer composites consisting of colloidal PbS nanocrystals blended with poly(2-methoxy-5(2-ethylhexyloxy)-p-phenylene vinylene). Quenching of the emission from the conjugated polymer due to…
Yttrium oxide (Y 2 O 3 ) microprisms with interesting trilobal cross section were synthesized through a large-scale and facile hydrothermal method followed by a subsequent heat treatment. The size of the Y 2 O 3 trilobal prisms could be modulated from micro- to submicroscale with the increase of pH value. The as-forme…
A series of poly( p -phenylene 3,6-bis(4-( n -alkyloxy)phenyloxy)pyromellitimide)s (C n -PMDA-PDA PIs) with various lengths of the n -alkyl bristle end group, which are well-defined polymer rods with two bristles per repeat unit of the polymer rod backbone, were studied as thin films using atomic force microscopy, opt…
The three main types of hydroxyl groups on a silica surface are classified as isolated, hydrogen bonded, and inaccessible. The isolated and hydrogen bonded groups are the most important as these readily exchange with D(2)O and thus are exposed to reactant molecules. However, it has generally been accepted that the ina…
The enthalpies of formation of hydrotalcite-like phases containing Mg and Al and intercalated with NO 3 -, Cl -, I -, ReO 4 -, or CO 3 2- were determined using high-temperature oxide melt and room-temperature acid solution calorimetry. The relative stability of phases bearing the various anions was gauged by comparing…
A series of nanocomposites prepared by melt-blending of Cloisite organoclays with ethylene- co -vinyl acetate (EVA) and ethylene- co -methyl acrylate (EMA) copolymers were investigated by using small-angle X-ray scattering (SAXS), wide-angle X-ray diffraction (WAXD), transmission electron microscopy (TEM), thermogravi…
Brownian dynamics computer simulations have been carried out of complexes formed by charged dendrimers and oppositely charged linear polymer chains of different degree of polymerization N ch . Bead−rod freely jointed models in the Debye−Hückel approximation without hydrodynamic interactions have been considered. Mean-…
Thin films of Cu x S are deposited by both chemical vapor deposition (CVD) and atomic layer deposition (ALD) using copper bis-tetramethylheptanedionate, Cu(thd) 2, and H 2 S as the precursors. Single-phase CuS and Cu 1.8 S can be deposited using both techniques, while in CVD also mixed phases can be formed. Comparing…
The formation of nanoassemblies of CdSe/ZnS quantum dots (QD) and pyridyl-substituted free-base porphyrin (H(2)P) molecules has been spectroscopically identified by static and time-resolved techniques. The formation of nanoassemblies has been engineered by controlling the type and geometry of the H(2)P molecules. Pyri…
Inorganic colloids are usually prepared via precipitation reactions, which involve two sequential steps: nucleation and growth of the nuclei. On the basis of this theory, preformed manganese carbonate nanoseeds were prepared by mixing diluted ammonium hydrogen carbonate with manganese sulfate solution to serve as nucl…
Optical absorption and photoluminescence (PL) properties of colloidal TiO(2) nanotubes, produced by the alkali hydrothermal method, were studied at room temperature in the range 300-700 nm. Nanotubes having an internal diameter in the range 2.5-5 nm have very similar optical properties, in contrast to the expected beh…
Porous silicon multilayer structures have remarkable optical and morphological properties that can be exploited for biosensing. In particular, a high internal surface area (>100 m(2)/cm(3)) and a linear response profile to changes in the dielectric environment enable fabrication of sensitive devices and a straightforw…
A method of computer simulation of Time-Resolved X-ray Diffraction (TRXD) in asymmetric Laue (transmission) geometry with an arbitrary propagating strain perpendicular to the crystal surface is presented. We present two case studies for possible strain generation by short-pulse laser irradiation: (i) a thermoelastic-l…
High refractive index nano-PbS/polymer composites were fabricated from reactive lead-containing precursors and polythiourethane (PTU) oligomer terminated with isocyanate group, followed by in situ gas/solid reaction. The lead-containing precursor with a chemical formula of Pb(SCH 2 CH 2 OH) 2 was synthesized in water…
Spherical silica particles that are able to assemble at a phase boundary of a dual-phase mixture of water and an immiscible organic solvent were prepared by a partial modification of their surface hydroxyl groups with an alkylsilylation agent. Scanning electron microscopic observation of these particles in which their…
Unilamellar nanosheet crystallites of manganese oxide generated the anodic photocurrent under visible light irradiation (lambda < 500 nm), while the nanosheets themselves were stable as revealed by in-plane XRD and UV-visible absorption spectra. The band gap energy was estimated to be 2.23 eV on the basis of the photo…
Highly crystalline, phase- and size-controlled CoO nanocrystals of hexagonal and cubic phases have been prepared by thermal decomposition of Co(acac)3 in oleylamine under an inert atmosphere. Kinetic and thermodynamic control for the precursor formation leads to two different seeds of hexagonal and cubic phases at hig…