Materials Literature
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The bulk glass transition temperature, T g b, of miscible binary blends can be well expressed by the Gordon−Taylor equation. Extending this notion to surface, the surface composition in the blend would be obtained by measuring the surface glass transition temperature, T g s, of each constituent as well as their blend.…
We have studied the magnetic relaxation properties of the phase-separated manganite compound ${\mathrm{La}}_{0.250}{\mathrm{Pr}}_{0.375}{\mathrm{Ca}}_{0.375}{\mathrm{MnO}}_{3}.$ A series of polycrystalline samples was prepared with different sintering temperatures, resulting in a continuous variation of phase fraction…
Adhesion between polymeric phases like adhesives and plastic surfaces is critical in many technological and industrial applications. In the last decades much progress has been made to understand the impact of the surface properties of both phases on the adhesive strength between them. These surface properties influenc…
A theoretical description of electron spin resonance (ESR) in 1D interacting metals is given, with primary emphasis on carbon nanotubes. The spin-orbit coupling is derived, and the resulting ESR spectrum is analyzed using a low-energy field theory. Drastic differences in the ESR spectra of single-wall and multiwall na…
The synthesis of ten benzyl ether based self-assembling monodendrons containing benzo[15]crown-5 at their focal point is presented. These dendritic building blocks self-assemble either directly or via complexation with NaOTf in two-dimensional smectic B, smectic A, and p6mm hexagonal columnar (Phi(h)) and three-dimens…
The nucleus of a new phase is considered as an inclusion embedded into a small grain of a polycrystalline matrix. The calculation of the nucleation barrier of dilatational phase transformation in nanosized crystals is carried out based on the concepts of surface stress associated with phase equilibria suggested by Cah…
The design, synthesis, and characterization of novel water-soluble iodinated dendritic nanoparticles, G-4-(DMAA-IPA) 37, is reported. They consist of a generation 4 Starburst PAMAM dendrimer core and 3- N- [( N ‘,N ‘-dimethylaminoacetyl)amino]-α-ethyl-2,4,6-triiodobenzenepropanoic acid (DMAA-IPA) molecules covalently…
The first hyperpolarizability of aqueous suspensions of polyphosphate stabilized CdS nanocrystals of different mean sizes and of Cd x Zn 1 - x S nanocrystals ( x = 0, 0.25, 0.75, 1) was determined by the hyper-Rayleigh scattering technique. We report the first experimental observation that the first hyperpolarizabilit…
Lipophilic guanosine derivatives are self-assembled into ribbonlike aggregates, both in the crystal state and in solution. The structure of the ribbons has been characterised by single-crystal X-ray diffraction and, in solution, by NMR spectroscopy and ESI-MS. Two different ribbons with different patterns of hydrogen…
Photochemical energy transfer of cationic porphyrins on an “anionic-type” clay (Sumecton SA) surface was investigated. Two types of complexes were formed between the cationic porphyrin and the “anionic-type” clay depending on the conditions. With the first type, the porphyrin molecules are adsorbed on both surfaces of…
Silica fibrils with a novel double stranded helical structure are prepared by sol-gel transcription of twisted bilayer ribbons formed by cationic gemini surfactants.
Progress reports are a new type of article in Advanced Engineering Materials, dealing with hot current topics, and providing readers with a critically selected overview of important progress in these fields. It is not intended that the articles be comprehensive, but rather insightful, selective, critical, opinionated,…
Fast switching redox processes in aqueous media can be obtained in poly(3,4-ethylenedioxythiophene)/poly(allylamine hydrochloride) (see Figure for chemical structure) multilayer films. Due to the intense near-infrared charge carrier transition of the oxidized form tailing through the visible region, these films provid…
X-ray absorption fine structure measurements of the Sr and La K edges of the solid solution La(1-x)SrxMnO3 reveal a consistent deviation from a random distribution of Sr at the La/Sr sites for x less than or similar to 0.3. Local structural disorder on the cation sublattice in the low-x samples is also observed to dif…
Polypropylenes with long chain branches were obtained using reactive extrusion in the presence of peroxide, a polyfunctional acrylate monomer and a co-reactant: a sulfide compound such as thiuram disulfide. By thermal decomposition, the thiuram disulfide gives two dithiocarbamate radicals. These radicals can be reacte…
We apply the density-matrix renormalization group technique to magnetic molecules in order to evaluate the low-lying energy spectrum. In particular, we investigate the giant Keplerate molecule Mo72Fe30 where 30 Fe3+ ions (spins 5/2) occupy the sites of an icosidodecahedron and interact via nearest-neighbor antiferroma…
Narrow Bi2Te3 nanowire arrays, where the individual wires are dense and parallel, have been fabricated by electrodeposition. The array–template composites have a high wire density over a large area (see Figure) and are relatively thick, which makes them ideally suited for direct incorporation into existing device stru…
By means of an analysis on evanescent waves in left-handed materials (LHM), we show that within a slab of such a medium, sandwiched between two positive refraction media, there is amplification of evanescent waves in ideal lossless, dispersiveless media; however, contrary to previous claims, this is limited to a finit…
An overview is given on lanthanide-containing liquid crystals. As such, the compounds are classified according to their chemical composition. The Schiff's base complexes, the alkanoates, and the phthalocyanines are discussed in depth. In addition, the lanthanide-containing surfactants, with emphasis on the behavior of…
Conducting polymer anodes for photovoltaic cells based on polyethylendioxythiophene (PEDOT) and its derivatives (see Figure) are reported. The results presented here show that it is feasible to use processable conducting (macro)molecular materials instead of indium tin oxide (ITO) for fabricating polymer photovoltaic…