Materials Literature
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Eleven members of the series CaRu 1− x Mn x O 3 with 0 ≤ x ≤ 1 have been prepared and characterized using a combination of Mn K-edge and Ru L 3,2 -edge X-ray absorption near edge structure spectroscopy and high resolution synchrotron X-ray powder diffraction. A complex distribution of four Mn 3+/4+ and Ru 4+/5+ oxidat…
Templated synthesis of thermoelectric nanowires in porous anodic alumina (PAA) have potential for enhanced performance relative to bulk materials. A significant challenge is the template material, which can serve as a thermal shunt. In this work, an approach for creating a branched PAA template is described. The proce…
Abstract Raman optical activity (ROA) is a relatively new technique used to determine the structure of chiral molecules and is proving useful in the study of biological molecules such as proteins and DNA/RNA. Here, for the first time, we demonstrate the applicability of ROA as a technique to study achiral groups in ch…
Abstract Sucrose decomposed under hydrothermal conditions, generating colloidal carbon spheres (CCSs) with a perfectly spherical morphology. X‐ray diffraction indicated that the main component of the CCSs was disordered carbon, and massive hydroxyl groups existed on the surface, as confirmed by Fourier transform infra…
A silicon nanocrystals (Si-ncs) conjugated-polymer-based bulk-heterojunction represents a promising approach for low-cost hybrid solar cells. In this contribution, the bulk-heterojunction is based on Si-ncs prepared by electrochemical etching and poly(3-hexylthiophene) (P3HT) polymer. Photoelectric properties in paral…
Carbon nanofiber (CNF) with springlike and double-helix structures has been synthesized by catalytic thermal pyrolysis of an acetylene precursor at 850–950 °C using iron nanopowder and thiophene as catalyst and promoter, respectively. High resolution electron microscopy revealed a higher d-spacing (∼3.46 Å) of (002) c…
Field electron emission from carbon nanofibers (CNFs) grown on a tungsten tip has been characterized by measuring emission current-voltage (I-V) curves and observing emission patterns on a phosphor screen. CNFs were vertically grown on the tip by plasma-enhanced chemical vapor deposition. Field emission from the CNFs…
Abstract Crosslinked poly(dimethyl siloxane) (PDMS) fibers were fabricated by electrospinning in combination with a sol–gel process followed by heat treatment. Before and after heat treatment, the changes in the chemical and thermal properties of the electrospun PDMS fibers were examined by differential scanning calor…
In this work, we demonstrate room temperature ferromagnetism of ZnO nanocrystals (NCs) embedded in alumina-based amorphous matrix. Our study has shown that solid solution occurred for lower Al concentration [≤x=0.09 for (Zn1−x,Alx)O]. No ferromagnetism appears in Al-doped ZnO with x≤0.09. With higher Al concentration,…
The formation of gold (Au) nanocrystalline films by reduction at the liquid/liquid interface has been investigated: three product fractions have been characterized, via electron and atomic force microscopy, X-ray photoelectron and UV−vis absorption spectroscopy, and X-ray diffraction. The mechanism suggested is deposi…
The adsorption behavior of CO on bimetallic Ni/Cu(110) surfaces has been studied experimentally by thermal-desorption spectroscopy and theoretically by density-functional theory (DFT) calculations. The bimetallic surfaces were produced either by evaporation of nickel or by decomposition of $\text{Ni}{(\text{CO})}_{4}$…
A vapor transfer deposition method was developed to fabricate metal (metal = Co, Ni, Cu, Zn, Mg) octaethylporphyrin (MOEP) nanowire arrays in large area on a variety of substrates. The formation process of MOEP nanowire arrays was investigated by time-dependently terminating deposition at various stages, based on whic…
Alchornea floribunda (Euphorbiaceae) leaves are widely used in African ethnomedicine for the management of acute and chronic inflammatory disorders. In the present study, bioactivity-guided fractionation led to the isolation of two known (1 and 3) and one new (2) stigmastane steroids from the hexane extract of Alchorn…
In situ observation of inelastic light scattering in Raman and Boson regions was performed in a niobiogermanate glass with a high nucleation ability during heating in order to examine its nanocrystallization dynamics. The relation of structural heterogeneity to the precursive stage of crystallization is also discussed…
A reversible elastic instability was observed in PZN-0.06PT high coupling single crystals when subjected to uniaxial compressions similar to those used in sound projectors. The strain magnitude at the onset of the instability supported a free energy prediction of a ferroelectric rhombohedral (FR)-ferroelectric orthorh…
A complete structural study has been carried out on sodium borophosphate glass containing increasing amounts of either niobium or tantalum. A combination of high energy x-ray diffraction, neutron diffraction, extended x-ray absorption fine structure, nuclear magnetic resonance, and infrared and Raman spectroscopy has…
We have developed a mulch sheet made by inflation molding of PLA, Ecoflex((R)) and modified starch, which all have different biodegradabilities. A field test of use as an agricultural mulch sheet for mandarin oranges was carried out over two years. The mechanical properties of the mulch sheet were weakened with time d…
Nonlinear laser processing of silane-based monolayers is used to fabricate nanostructured chemical templates for the selective growth of polymer brushes in confined domains via surface-initiated polymerization (SIP). Upon varying the laser parameters, reactive domains with lateral dimensions from several micrometers d…
Crowning glory: The assembly of CuII or CuII and NiII and a new 1,4-aryl-linked bis(triketonato) ligand designed to adopt a ‘bent’ configuration leads to unusual Cu6−nNinL3 (n=0, 3) metallacycles that feature unique hexanuclear metallacoronand structural motifs. In the case of the hexanuclear CuII species, strong anti…
We show that contrast analysis carried out by standard optical microscopy can be employed as a simple and quick technique to monitor the cleanness of graphene during the process steps required for device fabrication. Graphene flakes deposited by adhesive tape exfoliation can display a strong contrast increase upon pro…