Materials Literature
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Poly(methyl silsesquioxane) (MSQ)–titania optical thin films were synthesized and characterized in this study. An MSQ precursor with a mixed cage and network structure was prepared first, which had end groups of Si–OH and Si–OCH3. Then, it was reacted with titanium(IV) n-butoxide, followed by spin-coating and multi-st…
To investigated the preferential complexing behavior of isomeric xylenes, syndiotactic polystyrene (sPS) membranes are prepared using varying compositions of p- and m-xylene. Complex formation between sPS and xylenes was studied by means of thermogravimetric and FT-IR analyses to determine the exact amounts of solvent…
A systematic study of the influence of the nature of organic electrolytes on the formation and morphology of the macropores obtained on various medium- and low-doped p-type silicon samples (15-0.015 Ω cm) during anodization is presented. Optimizing the HF/organic solution composition allows extension of the limit of m…
X-ray diffraction measurements on the Cr–H system were made using synchrotron radiation at high hydrogen pressures and high temperatures, and the phase diagram was determined up to p(H2)=5.5 GPa and T\\lesssim1400 K. Three solid phases were found to exist; a bcc phase (α) of low hydrogen concentrations, x=[H]⁄[Cr]\\le…
A series of meso-phenylpyridylporphyrins and their respective supermolecular species obtained by the coordination of [ Ru ( bipy ) 2 Cl ] + groups to the pyridyl substituents was synthesized and characterized. Their spectroscopic and electrochemical behavior were similar to that observed for the meso-tetra(4-pyridyl)p…
Crystallization from solution is an industrially important unit operation due to its ability to provide high purity separations. The control of the crystal size distribution can be critically important for efficient downstream operations such as filtration and drying, and product effectiveness (e.g., bioavailability,…
Highly branched stilbene dendrimers were synthesized and their photochemical behavior was studied. Even the stilbene dendrimer with molecular weight over 6500 underwent trans-cis isomerization in the excited singlet state within the lifetime of 10 ns. The photoisomerization of C=C double bond of stilbene dendrimers in…
The hemocompatibility of four different wettable polymer membranes, namely Cuprophan (CE), polyether-polycarbonate (PC-PE), polysulfone (PSU), and polyetherimide (PEI), was investigated with respect to fibrinogen (Fng) adsorption and platelet adhesion/activation. In order to estimate the polar and dispersion component…
We report molecular dynamics simulations which investigate the influence of two parallel free surfaces in the deformation mechanisms of model nanocrystalline fee materials. The purpose of this simulation is to study which phenomena observed in in-situ tensile experiments performed in the electron microscope can be exp…
A remarkable increase in catalytic activity and selectivity in the intramolecular Pauson-Khand reaction is observed for Co complexes, immobilised on second- and third-generation dendron-functionalized polystyrene, as compared with their analogues on non-dendronized support.
A periodic mesoporous MCM-41 organosilica containing trans-1,2-bis(4-pyridyl)ethylene (t-BE) (350 m2 g-1; 0.28 cm3 g-1) incorporated in the silica walls undergoes photochemical isomerization to the cis configured bis(4-pyridyl)ethylene resulting in a dramatic area (473 m2 g-1) and pore volume (0.38 cm3 g-1) increase.
tonvenient methods for preparing optically active (S)-(+)-4-(1-methylheptyloxycarbonyl)-phenyl 4'-(ω-perfluoroalkanoyloxyalkoxy)- and 4'-(ω-alkanoyloxyalkoxy)biphenyl-4-carboxylates and their intermediates have been described and discussed. The phase transitions of the prepared esters have been investigated by differe…
A diblock copolymer consisting of poly(3-(triethoxysilyl)propylisocyanate) (PIC) and polystyrene(PS) was synthesized by anionic polymerization. A polymeric monolayer of the block copolymer was formed on silica substrates by various grafting techniques such as immersion, casting, or contact-printing. The PIC block adhe…
In this paper, the structural and electrochemical properties of the superstoichiometric ( Ti 0.8 Zr 0.2 ) ( V 0.533 Mn 0.107 Cr 0.16 Ni 0.2 ) x ( x = 2 , 3, 4, 5, 6) hydrogen storage alloys have been studied systematically. It is found by X-ray diffraction and energy dispersive spectra analysis that all these alloys m…
Diphenylphosphine functionalised polyhedral oligomeric silsesquioxane (POSS) dendrimers are used as ligands for the rhodium catalysed hydroformylation of oct-1-ene showing unexpectedly high regioselectivity to the linear aldehyde nonan-1-al (l ∶ b = 14 ∶ 1). Comparative studies with the small molecule analogues, bis-d…
The dynamics in the isotropic phase of the liquid crystal 1-isothiocyanato-(4-propylcyclohexyl) benzene (3-CHBT) are investigated from very short time (∼1 ps) to very long time (>100 ns) as function of temperature. The data decay exponentially only on the longest time scale (>10 ns). The temperature depe…
Abstract The ability of unrestricted Hartree–Fock (UHF), Møller–Plesset (MP2), density functional theory (DFT), and hybrid density functional/Hartree–Fock methodologies to describe the structure and spin‐state energetics of iron porphyrins was assessed. In the first place, these techniques have been applied to Fe, Fe…
Wide-band-gap semiconductors have numerous applications in electronic and optoelectronic devices. Progress is currently hampered by a lack of control over electrical conductivity: for instance, ZnO is typically n-type conductive, the cause of which has been widely debated. A first-principles investigation, based on de…
In this paper we present an identification scheme for diatoms using visual human-interpretable features. Diatoms are unicellular algae found in water and other places wherever there is humidity and enough light for photosynthesis. The automatic identification of diatoms has applications in a number of areas, for examp…
The elastic properties of SrTiO3 are investigated as function of temperature within an anharmonic electron‐phonon interaction model.. Pronounced zone boundary acoustic mode softening with decreasing temperature is observed, which is accompanied by giant elastic instabilities and the formation of microdomains. In the i…