Materials Literature
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This work reduces the computation cost of the C method by taking into account the symmetries of grating grooves. All one-dimensionally periodic, single-interface, surface-relief gratings are classified into five categories according to the symmetries of the planar periodic curves describing the interface. The five cat…
A quarter-wavelength absorber structure was developed for pyroelectric detector applications in the 2.5–3.5μm range. The absorber consisting of Pt and plasma-enhanced chemical vapor deposited SiO2 layers was fabricated using standard clean-room processes. It exhibited a minimum reflectance of 2%.
ZnO microspheres, with surfaces covered with nanowalls, as well as nano- and microrods, have been grown by thermal treatment of ZnS powder. The structures have been grown at temperatures in the range of 750−900 °C in a catalyst-free process. Previous mechanical treatment of the ZnS powder by ball milling has been foun…
We present a study of a family of 40 unique hydroxylated β-cristobalite surfaces generated by cleaving the β-cristobalite unit cell along crystallographic planes to include a combination of several low Miller index surfaces. The surface silicon atoms are quantified as percentages of Q 2 and Q 3 centers based on their…
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…