Materials Literature
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Using self-assembly techniques, x-ray reflectivity measurements, and computer simulations, we study the effective interaction between charged polymer rods and surfaces. Long-time Brownian dynamics simulations are used to measure the effective adhesion force acting on the rods in a model consisting of a planar array of…
Sodium borohydride reduction of silver ions in aqueous dispersions of exfoliated graphite oxide (GO) resulted in the formation of remarkably monodisperse 100 Å diameter oblate Ag particles that are effectively protected by 5 Å thick GO sheets, Ag−GO. Ag−GO could be self-assembled onto poly(diallyldimethylammonium) chl…
The photoluminescence and the local structure of sol−gel derived organic−inorganic hybrids, so-called ureasils, are discussed. Their host matrix is a silica-based network to which different numbers of oxyethylene repeat units 8.5, 15.5, and 40.5 for U(600), U(900), and U(2000), respectively are covalently grafted by m…
Ultrasonic irradiation of a slurry of amorphous silica microspheres, zinc acetate, and thioacetamide in an aqueous medium for 3 h under ambient air yields zinc sulfide coated on silica. The powder X-ray diffraction of the initial zinc sulfide−silica (ZSS) powder yields diffraction peaks corresponding to the ZnS phase.…
The adsorption of CO 2 on NiO(111)/Ni(111) and OD/NiO(111)/Ni(111) was studied by infrared reflection absorption spectroscopy (IRAS). When the surfaces were exposed to CO 2 at 123 K, peaks of adsorbates appeared at 1263 and 910 cm - 1 on NiO(111), while a peak appeared at 1267 cm - 1 on OD/NiO(111). The peaks at 1263…
The orthorhombic modification of CaPbO 3 was synthesized from a mixture of Ca 2 PbO 4 and PbO 2 at high temperature and high pressure. Its structure was analyzed by Rietveld analysis of neutron diffraction data on the basis of space group Pbnm. It has a distorted perovskite structure of the GdFeO 3 type and a unit cel…
The long-time self-diffusion of fluorescent molecular and colloidal tracers in a dense random packing of large (nondiffusing) spheres has been studied for the first time in situ, using fluorescense recovery after photobleaching. The long-time tracer diffusion coefficient depends uniquely on the ratio β of the tracer s…
Transition-metal complexes with prototypical ligands were studied using the PM3(tm) semiempirical method. The calculated complexes in this paper include 35 halides, 7 aqua complexes, 7 tris(ethylenediamine) complexes, 27 multiply bonded complexes, and 19 organometallics. PM3(tm)-predicted geometries were compared with…
The tris(2,2‘-bipyridine)ruthenium(II) complex (Ru(bpy) 3 2+ ) derivative monomer was copolymerized with N - tert -pentylacrylamide and N -dodecylacrylamide. These copolymers, p( t PA-Ru) and p(DDA-Ru), formed stable condensed monolayers at the air/water interface. The monolayers could be successively transferred onto…
Submonolayers of octadecylsiloxane (ODS) were prepared by adsorption from dilute solutions of octadecyltrichlorosilane (OTS) onto a series of different substrates: mica, native silicon (Si/SiO 2 ), and mica coated with a defined number n SiO of SiO 2 monolayers ( n SiO = 1, 2, 4, 6). Atomic force microscopy (AFM) was…
The alpha-1 and alpha-2 [P(2)W(17)O(61)](10)(-) isomers, derivatives of the Wells-Dawson molecule, [alpha-P(2)W(18)O(62)](6)(-), may be useful ligands for stabilizing high-valent metal ions and lanthanides and actinides. However, the potential utility of the [alpha1-P(2)W(17)O(61)](10)(-) ligand has not been realized.…
Transparent Si/SiOx nanocomposite films, spontaneously adsorbed on glass or quartz substrates from their colloidal suspensions via a sonication-assisted oxidation process, are presently reported. Individual nanosilicon particles (ca. 20 nm) appear to cover a significant part of the substrate along with agglomerates on…
The complexation of Cd(II) by the tripodal ligand tris[(2-pyridyl)methyl]amine and dipodal ligand bis[(2-pyridyl)methyl]amine was investigated by solution-state NMR and X-ray crystallography. Cadmium coordination compounds exhibiting rarely observed solution-state NMR (1)H-(111/113)Cd satellites were characterized. Th…
The size distribution of metastable oil droplets in water was investigated by the dynamic light-scattering method for tetralin (1,2,3,4-tetrahydronaphthalene), benzene, n -hexadecane, and their mixtures under surfactant-free conditions. For pure tetralin, droplets appeared with multiple peak distributions, first at si…
Tetraethoxysilane (TEOS) and octyltriethoxysilane (C 8 -TEOS) were used in the synthesis of an organic−inorganic hybrid glass composite by the sol−gel process. This composite was used as the stationary phase for chromatographic and electrophoretic separations when cast onto the inner walls of capillary columns. To inv…
This report describes a computer-aided CW- and pulsed-electron paramagnetic resonance (EPR) investigation on the structural modification of dimyristoylphosphatidylcoline (DMPC) vesicles, which occur upon interaction with starburst dendrimers (SBDs). Probes used for this study included doxyl-functionalized stearic acid…
The domain morphology of a polystyrene/poly(methyl methacrylate)/poly(2-vinylpyridine) (PS/PMMA/PVP) polymer blend was studied after spin-coating a film from a common solvent. The strongly incompatible polymer mixture phase-separates during spin-coating. Atomic force microscopy, combined with selective dissolution of…
So far, it is known that various poly(3-hydroxybutanoate), PHB, depolymerases are able to degrade all -( R ) chains, cyclic ( R ) oligomers, oligolides, and polymers composed of rac -hydroxybutanoate, HB, but not all -( S ) or syndiotactic ( R, S ) chains. We have now studied the ability for configurational recognitio…
We have measured the shear modulus and viscosity of two supercooled liquids: tricresyl phosphate and squalane. In both cases we find that the width of the peak in the imaginary part of the shear modulus narrows as the temperature is lowered toward the glass transition temperature. For tricresyl phosphate, we find no e…
The macrocyclic [LnNiL]Cl3 complexes (Ln = LaIII, CeIII, PrIII, NdIII, SmIII, EuIII) contain both lanthanide and transition metal ions. The crystal structure of [LaNiL]Cl3 reveals a square planar environment of Ni(II) ion and an 8-coordinate, irregular coordination sphere of La(III) ion. The 1H and 13C NMR spectra of…