Materials Literature
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An optically transparent hexagonal mesostructured tin oxide film with a microcrystalline framework was prepared by combining dipcoating and a subsequent treatment with water vapor. After a substrate was coated with an alcoholic precursor solution containing tin tetrachloride and nonionic surfactant, the substrate was…
Ba 0.6 Sr 0.4 TiO 3 thin films were grown on MgO(001) substrates using pulsed-laser deposition. The films were highly oriented along the (001) direction, and showed a high electro-optic response to an external electric field. The quadratic electro-optic coefficient Rc was 1.0×10−14 m2/V2, and the birefringence variati…
We study the phase behavior of hard rods with length polydispersity, within a simplified Onsager model. We focus on unusual effects occurring when the rod length distribution has a “fat” (e.g., log-normal) tail, up to some cutoff. The relatively large number of long rods in the system has strong effects: the isotropic…
The temperature-induced quenching in the photoluminescence intensity (IPL) of Er3+ ions in different semiconductor hosts is discussed in this letter. Based on a compilation of several IPL(T) experimental curves, corresponding to either crystalline or amorphous Er-doped samples, and after a critical data analysis, it w…
We have reinvestigated the Si $2p$ photoemission spectra of a clean $\mathrm{Si}(001)c(4\ifmmode\times\else\texttimes\fi{}2)$ surface with an apparently higher resolution than previous studies. A systematic and extensive line-shape analysis of the spectra taken at various photon energies and emission angles indicates…
The directional dependence of folding rates for rod-like macromolecules such as parallel alpha-helical coiled-coils, DNA double-helices, and collagen triple helices is largely unexplored. This is mainly due to technical difficulties in measuring rates in different directions. Folding of collagens is nucleated by trime…
In order to investigate the anharmonicity of different phonons in the negative thermal expansion material zirconium tungstate, Raman spectroscopic measurements are carried out as a function of temperature over the complete range of stability of $\ensuremath{\alpha}$ phase. The temperature dependence of phonon frequenc…
9-(9-Fluorenyl)-nonane-1-thiolate and 12-(9-fluorenyl)-dodecane-1-thiolate (fluorenyl-alkane-1-thiolates) monolayer-protected gold clusters (Au-MPCs) have been prepared by place exchange of fluorenyl-alkane-1-thiol with alkane-1-thiolate Au-MPCs. The structures of these composites were established by TEM, elemental an…
Views Icon Views Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Icon Share Twitter Facebook Reddit LinkedIn Tools Icon Tools Reprints and Permissions Cite Icon Cite Search Site Citation Yu Zhong, Shi-Qing Wang; Exfoliation and yield behavior in nanodispersions of organically modifie…
Single-crystalline Zn/ZnS coaxial nanocables were fabricated through thermal reduction of ZnS using graphite powder at elevated temperatures. Energy dispersive x-ray analysis of the as-fabricated samples indicated that the nanowires were composed of Zn and S only. Transmission-electron-microscopic study of the nanowir…
Aggregate-containing solutions of poly( n -hexyl isocyanate) (PHIC) and atactic polystyrene of finite concentrations were studied by static and dynamic light scattering. Their static structure factors Ŝ ( k ) and the intensity autocorrelation functions g (2) ( t ) exhibited the enhanced low-angle scattering and bimoda…
Recently, the properties of supercooled liquids have been studied by mapping instantaneous configurations onto minima of the gradient squared. It was originally suggested that this mapping would probe higher-order saddle points of the potential energy surface. However, it was subsequently shown that the majority of th…
An inexpensive and practical mastering technology was developed using a blue-laser optical system with a wavelength λ of 405 nm and numerical aperture (NA) of 0.95 comprising an inorganic photoresist. The resist system showed a higher resolution for a successful 130 nm pit patterning than that obtained by an ordinary…
Abstract The mechanical, structural, and thermal properties of injection‐molded composites of granular cornstarch, poly( D , L ‐lactic acid) (PDLLA), and poly(hydroxy ester ether) (PHEE) were investigated. These composites had high tensile strengths, ranging from 17 to 66 MPa, at starch loadings of 0–70 wt %. Scanning…
Chemical methods for the exfoliation of transition metal dichalcogenides in a liquid medium to give single-layer dispersions containing quasi-two-dimensional layers of these compounds are surveyed. Data on the structure of dispersions and their use in the synthesis of various types of heterolayered intercalation compo…
Organophosphate esters, halogenated and non-halogenated, are frequently used for fire protection of building materials. With regard to toxicological profiles it is desired to avoid human exposure in the indoor environment. Moreover, some hazardous volatile organic compounds detected in indoor air are directly linked t…
Abstract The usefulness of cotton waste as a source of reinforcing fibers for the preparation of cost‐effective and biodegradable composites has been investigated. Biodegradable polyester (bionolle 3020) is melt‐compounded together with cotton fibers. Maleic anhydride‐grafted bionolle (bionolle‐g‐MA) is used as a comp…
We present a simple dry process to create nanoscale arrangements of metal nanoparticles within block copolymer films. This process involves only one step such that the vapor of palladium(II) acetylacetonato (Pd(acac) 2 ) is exposed to a polymer film in a nitrogen atmosphere at 180 °C for periods up to 2 h. The Pd(acac…
The deformation properties under a tensile load of poly( ε -caprolactone) (PCL) were compared to those of PCL/PVME and PCL/SAN mixtures. The critical strains at the end of the Hooke range (point A) and at the yield point (point B) remain unchanged. The critical strain marking the beginning of a disintegration of the b…
Catalytic decomposition of urea by enzyme urease in aqueous strontium and barium chloride solutions was used to rapidly precipitate witherite (BaCO 3 ) and strontianite (SrCO 3 ) particles at room temperature. At the early stages of the process, uniform spheroidal particles were generated, which were shown to consist…