Materials Literature
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The coverage of Au surfaces with Au nanowires by linking them with DNA offers great prospects for the assembly of wire structures with particular connectivity. This work presents the first example of using DNA hybridization to control the assembly of micrometer-size inorganic particles on surfaces. The Figure shows th…
The generation of hole array architectures with, for example, square or triangular patterns (see Figure) is achieved by controlling the spatial definition of the indentation sites for hole development in anodic porous alumina. The technique has potential for the fabrication of two-dimensional photonic crystals, or car…
High speed steels are ferrous based alloys of the Fe–C–X multicomponent system where X represents a group of alloying elements comprising mainly Cr, W or Mo, V, and Co. These steels are mainly used for cutting tools, since they are characterised by their capacity to retain a high level of hardness while cutting metals…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTPhotoregulation of Fluorescence in a Porphyrinic Dithienylethene PhotochromeTyler B. Norsten and Neil R. BrandaView Author Information Department of Chemistry, University of Alberta Edmonton, AB, Canada T6G 2G2 Cite this: J. Am. Chem. Soc. 2001, 123, 8, 1784–1785Public…
Since the mid-1980s, there has been a growth of interest in the search and development of molecular second-order nonlinear optical (NLO) materials that possess various device applications. Beside the most traditional donor-acceptor (“push-pull”) organic chromophores (e.g. the stilbene family), chemists have increasing…
Tuning the electron emission properties of films containing carbon nanotubes is demonstrated. Microcontact printing is used to pattern silicon substrates with catalyst, which facilitates the growth of the carbon nanotubes by the chemical vapor deposition of acetylene. The catalyst is applied in liquid form to an elast…
Trisulfide molybdenum complexes have been employed to produce nanotubes by simple heating in a stream of hydrogen. Bamboo-like stacking (see Figure) was observed, suggesting that the stimulus for the growth of MoS2 nanotubes is similar to that of their carbon equivalents. The wide experience gained with trisulfide com…
Transparent p-type conducting CuGaO2 thin films were prepared on α-Al2O3 (001) single-crystal substrates by pulsed laser deposition. The films were grown epitaxially on the substrates in an as-deposited state. X-ray pole figure analysis revealed that the films were composed of two types of epitaxial grains, both with…
Organ shortage and suboptimal prosthetic or biological materials for repair or replacement of diseased or destroyed human organs and tissues are the main motivation for increasing research in the emerging field of tissue engineering. No organ or tissue is excluded from this multidisciplinary research field, which aims…
Scaffolding plays pivotal role in tissue engineering. In this work, a novel processing technique has been developed to create three-dimensional biodegradable polymer scaffolds with well-controlled interconnected spherical pores. Paraffin spheres were fabricated with a dispersion method, and were bonded together throug…
This review surveys the work developed in the field of functional hybrid materials, especially those containing conducting organic polymers (COPs), in combination with a variety of inorganic species, from molecular to extended phases, including clusters and nano-sized inorganic particles. Depending on the dominating s…
A method is presented for automated best-matching alignment of three-dimensional models represented by ensembles of points. A normalized spatial discrepancy (NSD) is introduced as a proximity measure between three-dimensional objects. Starting from an inertia-axes alignment, the algorithm minimizes the NSD; the final…
Recent developments in conjugated-polymer-based photovoltaic elements are reviewed. The photophysics of such photoactive devices is based on the photo-induced charge transfer from donor-type semiconducting conjugated polymers to acceptor-type conjugated polymers or acceptor molecules such as Buckminsterfullerene, C60.…
The book develops the modern theory of ferroelectricity in terms of soft modes and lattice dynamics and also describes modern techniques of measurement, including X-ray, optic, and neutron scattering, infrared absorption, and magnetic resonance. It includes a discussion of the related phenomena of antiferroelectricity…
The effect of film thickness on the water-sorption behaviors of poly(3,4′-oxydiphenylene pyromellitimide) (PMDA-3,4′ODA) films was gravimetrically investigated and interpreted with a Fickian diffusion model in films. The diffusion coefficient increased with increasing film thickness, whereas the water uptake and the a…
The new mineral schiavinatoite (Nb, Ta) BO 4 , the niobium analogue of behierite, has been found in a boronrich pegmatite at Antsongombato, south of Betafo, in the Malagasy Republic, as portions of a greyish-pink bipyramidal crystal of Nb-rich behierite. Associated minerals are rhodizite, liddicoatite, spodumene, poll…
Preparation of pendent-type viologens on polymeric substrates was carried out by a surface graft copolymerization technique. This method involved a two-step process whereby vinyl benzyl chloride (VBC) was first graft copolymerized on the polymeric substrate followed by the attachment of viologen moieties to the graft-…
Self-assembly of ionic surfactants resulting in micelle formation is studied using off-lattice Monte Carlo simulation in two dimensions (2D). We find that in addition to the Lennard-Jones (LJ) interaction, which acts among all of the particles, a screened Coulomb interaction, acting only among the surfactant heads, ma…
Paganoite, ideally NiBi 3+ As 5+ O 5 , triclinic space group P1, a = 6.7127(8), b = 6.8293(8), c = 5.2345(6) A, α = 107.625(2)°, β = 95.409(2)°, γ = 111.158(2)°, V = 207.62 A 3 , a:b:c: = 0.9829:1:0.7665, Z = 2, is a new mineral found on a single nickeline-veined quartz specimen from Johanngeorgenstadt, Saxony, German…
After x-ray irradiation at 20 K, an intrinsic O - centre was identified by ESR and ENDOR spectroscopy as the self-trapped hole centre in ZnWO 4 . Observation of one Zn and two strong W superhyperfine interactions allows us to distinguish between two possible trapping sites: the hole resides at the B-type oxygen positi…