Materials Literature
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Oxidation of graphite may be carried out by reaction with meta-chloroperoxybenzoic acid to yield graphite epoxide. Scanning tunneling microscopy (STM) showed that the functionalization occurs at the edges rather than on the basal plane of the graphite. Quantification of the epoxide content is possible through the deep…
Abstract Brachiopods are a phylum of shell-forming sessile marine invertebrates which have existed since the early Cambrian. Two very different biomaterial design strategies for their shells evolved early in their history. Both strategies use hybrid fibre composites, however, one is based on mineral fibres embedded in…
Linear Fe(II) 1,2,4-triazole complexes with lipid counteranions are newly developed. These complexes show sharp and reversible spin conversion in toluene, with temperatures significantly higher (by 20-100 K) than the spin crossover temperatures observed in the crystalline states. This is accounted for in terms of incr…
We describe the formation of self-assembling nanoscale fibrillar aggregates from a hybrid system comprising a short polypeptide conjugated to the fluorophore fluorene. The fibrils are typically unbranched, approximately 7 nm in diameter, and many microns in length. A range of techniques are used to demonstrate that th…
In order to understand the relationship between the dielectric properties and the structure of polymer nanocomposites, especially the role of the interface on dielectric response, two polymers with different polarity were used to form nanocomposites with nanoalumina powder, a typical polar inorganic compound. Conseque…
Abstract—A derivation of metamaterial blueprints for the reflectionless (perfectly matched) guiding of electromagnetic waves through waveguide bends is performed. The sensitivity of the response with respect to small perturbations in the associated constitutive tensors is examined. Index Terms—Metamaterials, waveguide…
Low energy electrons (LEE) induce DNA damage by dissociative electron attachment, which involves base release (N-glycosidic bond (N-C) cleavage) and the formation of strand breaks (phosphodiester-sugar bond (C-O) cleavage). The effect of terminal phosphate and base moieties was assessed by exposing DNA model compounds…
The synthesis of vertically aligned carbon nanotubes with submillimeter-order heights was performed using ethanol chemical vapor deposition with Co catalysts supported on Al 2 O 3 substrates. The effects of Al 2 O 3 in the form of amorphous alumina and single-crystalline sapphire were investigated through a characteri…
We have developed a ferroelectric-gate field-effect transistor (FeFET) composed of heteroepitaxially stacked oxide materials. A semiconductor film of ZnO, a ferroelectric film of Pb(Zr,Ti)O 3 (PZT), and a bottom gate electrode of SrRuO 3 (SRO) are grown on a SrTiO 3 (STO) substrate. Structural characterization shows a…
Polyhydroxyalkanoate (PHA) production was achieved using tomato cannery waste coupled with a mixed microbial culture during wastewater treatment. The two-stage PHA production process comprised a sequencing batch reactor (SBR), operating under a periodic feast-famine regime, to accomplish simultaneously wastewater trea…
Abstract Clay minerals impart important chemical properties to soils, in part, by virtue of changes in the redox state of Fe in their crystal structures. Therefore, measurement of Fe(III)/Fe(II) and partitioning of Fe(II) in different reactive sites in clay minerals (during biological and chemical Fe(III) reduction) i…
We report on far infrared magnetotransmission measurements on a thin graphite sample prepared by exfoliation of highly oriented pyrolytic graphite. In a magnetic field, absorption lines exhibiting a blueshift proportional to $\sqrt{B}$ are observed. This is a fingerprint for massless Dirac holes at the $H$ point in bu…
Surface-enhanced Raman scattering (SERS) is shown to give linear and sensitive concentration-dependent detection of folic acid using silver nanoparticles created via ethylene-diaminetetraacetic acid (EDTA) reduction. Optical detection by SERS overcomes the primary limitation of photodissociation encountered during the…
Nanostructured La 0.6 Sr 0.4 Co 0.2 Fe 0.8 O 3−δ (LSCF) oxide powder was synthesized by a facile autocombustion process based on a modified glycine‐nitrate process (GNP) using cellulose fiber as micro‐reactor. As compared with the normal GNP, this novel process allows the combustion to proceed in a much more environme…
Negative thermal expansion material of yttrium molybdate has been synthesized by rapid solidification with a CO 2 laser. It crystallized in the orthorhombic phase with unique microstructures consisting of nanoparticles or nanodendrites with grain sizes around 20−30 nm. Raman spectroscopic and XRD analyses reveal that…
Abstract A novel efficient and eco‐friendly nanocrystalline ZnO catalyst was used for the Knoevenagel condensation and for the reduction of CC double bonds at room temperature in the absence of solvents.
Going out on a limb: A combination of theoretical techniques, high-resolution microscopy, and energy-dispersive X-ray spectroscopy shows the role sulfur plays in branching phenomena during carbon nanotube (CNT) network growth. A model is proposed in which small amounts of sulfur are enough to trigger the growth of a b…
The effects of sintering temperature and dwell time on the magnetostrictive properties of polycrystalline cobalt ferrite synthesized by the conventional ceramic method have been investigated. The present study showed that the magnitude of magnetostriction strongly depends on the microstructure of the final sintered pr…
There are a variety of test methods in use to measure the ability of fabrics to transport water vapor. They vary with respect to construction mechanisms, test conditions, and measurement parameters. Five testing instruments plus a new test apparatus were employed to evaluate the water vapor transport properties of fab…
Abstract Vaterite and aragonite polymorphs in freshwater cultured pearls from mussels of the genus Hyriopsis (Unionidae) were structurally and compositionally characterized by Raman spectroscopy, Micro computer tomography, high resolution field emission scanning electron microscopy, electron microprobe analysis and la…