Materials Literature
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Left-handed-helical nanoropes are formed from higher-order self-assemblies of chiral aggregates during the gelation of a rigid π-conjugated oligo(p-phenylenevinylene) with remote chiral handles (see picture; R=C12H25). The concentration- and temperature-dependent CD-signal changes observed for these assemblies are ind…
The most desirable features of PbS nanocrystal (NC) synthesis are demonstrated in a new one‐stage route: Aqueous synthesis to enable compatibility with biological assays and polymer–nanocrystal device fabrication; simplicity; non‐toxic solvents; and moderate reaction temperatures. The NCs produced (see Figure) have st…
Silicon nanoparticles (NPs) of ∼4.5(1.10) nm from a room-temperature solution route are terminated by a silanization method for the first time. Energy-selected emission is observed, consistent with the distribution of sizes obtained by this route. The NPs are photochemically stable in nonpolar organic solvents and whe…
Historically most materials in magnetic applications are based on inorganic materials. Recently, however, organic and molecular materials have begun to show increasing promise. Purely organic ferromagnets, based upon nitronyl nitroxide radicals, show long range magnetic order at very low temperatures in the region of…
A cathode material for rechargeable lithium batteries is one possible application for the birnessite‐related layered MnO 2 nanobelts (see Figure) reported here. A simple hydrothermal procedure is described that results in high‐purity, long (up to several tens of micrometers) nanobelts with narrow size dispersion (widt…
Unison is a new class of highly counterfeit and simulation resistant micro-optic security films that provide a wide range of overt, unique, and highly visible three-dimensional and fluidic motion visual effects for currency, document, and product authentication by the general public. Unlike holograms, interference fil…
In differential analysis, noises may induce high fluctuations in the differential thermogravimetric curve (DTG) curve and thereby induce considerable errors in the evaluation of kinetic parameters. This paper studies the strategy of using the Gaussian smoothing algorithm in the pretreatment of biomass decomposition da…
The reconstruction in air of passive films on iron formed at −0.4 V in a borate buffer solution was investigated by STM and galvanostatic cathodic reduction. With exposure to air (<30% RH), the apparent thickness rapidly increased in initial stages until a critical exposure duration of about 130 min, and after a trans…
Abstract Polysilphenylenesiloxanes containing various amounts of vinyl substituents (ranging from partial (25 %) to complete (100 %)) on the silicon atoms were synthesized. 29 Si NMR spectroscopy revealed that they had a well defined structure, as designed. Unlike the known crystalline poly(tetramethyl‐ p ‐silphenylen…
Single crystals of 4-dimethylamino pyridinium dihydrogen phosphate (DMAPDP) (C 7 H 13 N 2 PO 4 ) were successfully grown for the first time by the slow evaporation method at constant temperature (30 °C) at a pH of 4.45 with dimensions 15 × 13 × 2 mm 3 . The solubility was found to be high in water and so the crystalli…
The C(1)-symmetrical complex [Ru(bpy)(2)(ieil)][PF(6)](2) exhibits unique electrochemical and photophysical properties, and forms discrete dimers in solution and in the solid state held by weak pi-pi stacking interactions via its isoeilatin ligand, preferentially from one of its faces and in a specific orientation.
This work studies the behavior of a manganese dioxide catalyst during the total oxidation of methanethiol. Modifications of the working γ-MnO 2 catalyst were characterized by XPS, XRD, DRIFTS, and potentiometric measurements after reactions at different durations and at different temperatures. At temperatures below 20…
A comparison between the hydrogen storage performances of untreated and heat-treated Li 3 N was carried out using a volumetric method, temperature-programmed hydrogenation (TPH), and scanning electron microscopy (SEM). It was found that, during the first hydrogenation, the untreated Li 3 N could absorb fast (3 min), 5…
Transformers are normally designed and built for utilizing at rated frequency and perfect sinusoidal load current. Supplying non-linear loads by transformer leads to higher losses, early fatigue of insulation, premature defectiveness and reduction of the useful life of the transformer. To prevent these problems, rated…
Abstract Summary: It has been a real challenge to form carbon nanotube (CNT)/polymer composites where CNTs are well‐dispersed in the polymer matrix and the interactions between CNTs and polymers are effectively strong. In this paper, we applied surface‐initiated, ring‐opening polymerization (SI‐ROP) of p ‐dioxanone (P…
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Abstract A styrene‐acrylic/SiO 2 nanoparticle composite emulsion was prepared by using SiO 2 nanoparticles as seeds. The effect of factors such as the level of nano‐SiO 2 , reaction temperature and ultrasound treatment of nano‐SiO 2 on the stability of the polymerization reaction was investigated. Water‐resistance of…
Abstract The effect of the degree of crystallinity on the dynamic mechanical relaxation behaviour (flexural storage modulus and loss tangent) of polycaprolactone has been investigated. The degree of crystallinity was found to determine the temperature of the α‐relaxation process and the relaxation strength of the β‐re…
We investigate viscous fingering instabilities of the double-front system which results when fluid is injected into a porous medium containing fluid of a different composition and temperature. We describe a linear stability analysis based on an eigenfunction expansion method which enables us to investigate the structu…
Poly(ethylene oxide) (PEO) and poly(perfluorohexylethyl methacrylate) (PFMA) containing amphiphilic block copolymers have been investigated for their interfacial behavior and their penetration into 1,2-diphytanoyl- sn -glycero-3-phosphocholine (DPhPC) monolayer at the air/water interface by measuring surface pressure…