Materials Literature
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The relationship between the conductivity and the polarization noise is measured in a colloidal glass as a function of frequency in the range 1 Hz-40 Hz. It is found that at the beginning of the transition from a fluid-like sol to a solid-like colloidal glass the fluctuation-dissipation relation is strongly violated.…
CdS nanostructures with high crystallinityare widely investigated for their semiconductor properties. This work focuses on the preparation and properties of equilateral-triangular nanocrystals made by colloidal self-assembly. The picture shows the results of high-resolution transmission electron microscopy imaging of…
We report on the preparation of the thin films of calcium carbonate (CaCO 3 ) crystals on solid matrixes, i.e., cellulose, chitosan, and chitin in the presence of an acidic macromolecule. The crystal growth from CaCO 3 solution containing poly(acrylic acid) as a soluble acidic polymer results in the formation of CaCO…
For the latest EPM potentials, please see appendix A in Physical Review B, 59, 15270 (1999)
The intermolecular self-crosslinking of functionalized macromolecules under ultra-dilute conditions (see Figure) provides a versatile approach to the preparation of nanoparticles with very small sizes. The size and the chemical nature of the particles are easily controlled and the use of particles produced in this way…
RATIONALE AND OBJECTIVES: The suitability of paramagnetic complexes as magnetic resonance contrast agents depends on various factors such as their relaxivity, stability, selectivity, and the inertness toward transmetallation by endogenous ions. The transmetallation of a series of 18 gadolinium complexes by the Zn2+ io…
The self-assembly of polystyrene beads into a variety of polygonal and polyhedral clusters is reported. The Figure shows a schematic illustration of the procedure used to form these well-defined clusters under physical confinement. These aggregates will be useful as new types of building blocks in hierarchical self-as…
The magnetic properties and the low-temperature magnetic structures of the orthorhombic perovskite HoMnO 3 (space group Pnma ) have been studied on polycrystalline samples by magnetization, specific heat, and neutron diffraction measurements. By cooling, HoMnO 3 exhibits three singularities at T N = 41 K, T ≈ 26 K, an…
A large number of natural and synthetic porphyrins of diverse chemical compositions and characteristics can be isolated from nature or synthesised in the laboratory. Antimicrobial and antiviral activities of porphyrins are based on their ability to catalyse peroxidase and oxidase reactions, absorb photons and generate…
In this study, the optical properties of nanocrystalline europium doped yttria, Y2O3:Eu3+ were investigated in dependence on different caging hosts such as porous MCM-41, porous silica, and porous alumina with pore sizes ranging between 2.7 to 80 nm. These results were compared to nanopowders measured in air and aqueo…
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…