Materials Literature
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The effect of a remote oxygen plasma on nanocomposite hybrid polymer thin films of poly[(propylmethacryl-heptaisobutyl-polyhedral oligomeric silsequioxane)-co-(methylmethacrylate)] (POSS-MA) has been examined by advancing contact angle, X-ray photoelectron spectroscopy (XPS), and variable-angle spectroscopic ellipsome…
2-Pyranone-annulated trans -stilbene, viz., 4-methyl-7-styrylcoumarin ( 4 ), crystallizes in two photoreactive plate- and needle-like crystal modifications, each of which undergoes topochemically controlled stereospecific double [2+2] photocycloaddition to afford a strained tricyclic paracyclophane 6 in an isolated yi…
The layered double hydroxides (LDHs) of Co with trivalent cations decompose irreversibly to yield oxides with the spinel structure. Spinel formation is aided by the oxidation of Co(II) to Co(III) in the ambient atmosphere. When the decomposition is carried out under N2, the oxidation of Co(II) is suppressed, and the r…
The pectic polysaccharide named potamogetonan (PN) was obtained using extraction of the leaves and stems of the common pondweed Potamogeton natans L. by an aqueous ammonium oxalate. The purified potamogetonan PN-300 was obtained using membrane ultrafiltration of PN and proved to be pectin with a molecular weight of 30…
This paper explores the relationship between the level of preferred molecular orientation at different length scales and the subsequent glassy stress/strain behavior of polystyrene. To produce samples with a range of orientation states, samples of a commercial polydisperse polystyrene ( M w = 274 000 g/mol, polydisper…
In selective withdrawal, fluid is withdrawn through a nozzle suspended above the flat interface separating two immiscible, density-separated fluids of viscosities nu(upper) and nu(lower) = lambda nu(upper). At low withdrawal rates, the interface gently deforms into a hump. At a transition withdrawal rate, a spout of t…
We consider electrical transport through molecules with Heisenberg-coupled spins arranged in a ring structure in the presence of an easy-axis anisotropy. The molecules are coupled to two metallic leads and a gate. In the charged state of the ring, a Zener double-exchange mechanism links transport properties to the und…
Abstract Photoactive interfaces created by mesoscopic materials realize high-efficiency light to electric conversion as achieved by dye-sensitized photoelectrodes. Combinaiton of soft carbon composite materials with the mesoscopic interfaces enables solidification of the electrochemical charge-transfer interfaces and…
We have found that the current-voltage characteristics of ${\mathrm{La}}_{0.7}{\mathrm{Sr}}_{0.3}\mathrm{Mn}{\mathrm{O}}_{3(\ensuremath{-}\ensuremath{\delta})}∕\mathrm{Nb}:\mathrm{Sr}\mathrm{Ti}{\mathrm{O}}_{3}$ rectifying junctions are quantitatively well described by (thermally assisted) tunneling with an effectivel…
Hybrid organic−inorganic crystalline materials have been obtained from a simple solvent-free synthesis in highly basic conditions. The formation of an organized hybrid structure has been achieved for the first time via sol−gel without employing bridged organosilica precursors. 3-glycidoxypropyltrimethoxysilane, which…
The kinetics of gas uptake on different regions of carbon nanotube bundles is investigated by means of a kinetic Monte Carlo scheme. A lattice-gas description is used to model the adsorption of particles on a one-dimensional chain of sites under two types of dynamics: (a) external kinetics, in which the chain is on th…
Polyelectrolyte multilayers (PEMs) are thin films, which are assembled one molecular layer at a time, by alternatingly adsorbing polycations and polyanions making use of their attractive electrostatic interaction. Since the porosity of PEMs is one of the properties of major interest, in the current work the first pore…
CO oxidation: The suitability of Pt nanoparticles capped with dodecylamine or hexanethiol ligands as oxide-supported catalysts was investigated by FTIR spectroscopy (see picture for the hexanethiol data). It is shown that CO can penetrate the ligand shell and that the Pt nanoparticles possess activity for CO oxidation.
Kaolin deposits, situated approximately 20 km south of Hisarcık, have been formed by the alteration of dacite and dacitic tuffs related to the Miocene volcanism associated with extensional tectonics. The Hisarcık kaolin deposits occur in the Kızılcukur, Ulaşlar and Kurtdere areas. Kaolinite is the only clay mineral as…
We report the first direct measurement of the proton 3-D Born-Oppenheimer potential in any material. The proton potential surfaces in the hydrogen-bonded superprotonic conductor Rb(3)H(SO(4))(2) are extracted from the momentum distribution measured using Deep Inelastic Neutron Scattering (DINS). The potential has a si…
The aim of this study is to evaluate the potential use of first-generation (G1) polyamidoamine (PAMAM) dendrimers as drug carriers to enhance the permeability, hence oral absorption, of drugs that are substrates for P-glycoprotein (P-gp) efflux transporters. G1 PAMAM dendrimer-based prodrugs of the water-insoluble P-g…
The first-principles calculations were performed for various structures of $\mathrm{Ir}{\mathrm{N}}_{2}$ as candidates of the new phase which was recently synthesized under high pressure. It was found that the monoclinic structure is the most stable and shows higher bulk modulus than pyrite $\mathrm{Pt}{\mathrm{N}}_{2…
The self-assembly of diblock copolymer mixtures (A- b -B/A- b -C or A- b -B/B- b -C mixtures) subjected to cylindrical confinement (two-dimensional confinement) was investigated using a Monte Carlo method. In this study, the boundary surfaces were configured to attract blocks A but repel blocks B and C. Relative to th…
Rh/CeO2 catalysts submitted to different H2 reduction, Ar+ sputtering, and oxidation treatments have been studied by X-ray photoelectron (XPS) and 1H nuclear magnetic resonance (NMR) spectroscopies. Depending on the reduction temperature, two stages have been identified in the reduction of the catalyst: below 473 K, r…
Single crystals of the poly( l -lactide) (PLLA) block and the poly(ethylene glycol) (PEG) block in poly( l -lactide)−poly(ethylene glycol) diblock copolymer were obtained by melt crystallization. The morphology, structure, and evolution process of the single crystals were investigated using transmission electron micro…