Materials Literature
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A new copper−antimony sulfide, [C 4 H 12 N 2 ] 0.5 [CuSb 6 S 10 ], has been hydrothermally synthesized from binary metal sulfides in the presence of triethylenetetramine and characterized by single-crystal X-ray diffraction, thermogravimetry, elemental analysis, and SQUID magnetometry. The product ( M r = 1158.72) cry…
Nano-scale textures of transparent and ultra water-repellent thin films are prepared by microwave plasma CVD (Figure) using trimethylmethoxysilane. Water-repellency of films deposited on glass, silicon and polymethylmethacrylate substrates are discussed in terms of their nanotextures, the control of which is crucial t…
Synthesis and properties of new pH-sensitive cholesteric polymer composites are described. Polymer composites, consisting of low molar mass liquid crystal and chiral molecules entrapped in the polymer network, responded to changes in the chemical environment by increasing the pitch of the cholesteric helix. Hydrogen b…
The ion exchange occurring between a poly(vinylferrocene) (PVF) film and the bathing solution during the oxidation−reduction process was studied by probe beam deflection (PBD) in aqueous and nonaqueous media. In nonaqueous media the results for different electrolyte salts indicate that anions are exchanged. In aqueous…
Abstract Low‐density polyethylene was modified to incorporate aniline moieties by reactive processing with 4‐aminobenzenesulfonyl azide. Under melt‐processing conditions, the loss of nitrogen produces a sulfonyl nitrene which, in the singlet state, interacts with the substrate primarily by C–H insertion. Polymeric ble…
Two novel silicate anions, a singly-substituted cubic octamer (double four-ring cage with a pendant orthosilicate group) and its dimeric counterpart (two octameric cages linked by a single siloxane bridge), are detected by 29Si NMR spectroscopy in concentrated tetraalkylammonium silicate solutions at the low alkalinit…
The Sicarid spider Loxosceles laeta spins broad but very thin ribbons of elastic silk that it uses to form a retreat and to capture prey. A structural investigation into this spider's silk and spinning apparatus shows that these ribbons are spun from a gland homologous to the major ampullate gland of orb web spiders.…
Structural and transport properties of Cs 8 Cd 4 Sn 42 are reported. Cs 8 Cd 4 Sn 42 has a thermal conductivity that is unusually low for a crystalline solid (1 W m - 1 K - 1 at room temperature). This low lattice thermal conductivity is associated with the rattling of cesium in the tetrakaidecahedral cavities, as ind…
Data on the use of electrochemically generated metal complex catalysts in organic synthesis are analysed, systematised and generalised. The considerable potential of organic electrochemistry is shown. Some electrochemical methods provide advantages in the synthesis of compounds where conventional chemical methods fail…
We present the first study of chirality from the UV to the IR region for a conducting polymer, thereby probing the motion of the metallic “free carriers.” Through study of chiral and achiral camphorsulfonic acid (CSA) doped polyaniline (PAN) films cast from different solvents ( m -cresol and chloroform) and correlatio…
The interface between the science and engineering of biology and materials is an area of growing interest. One of the goals of this field is to utilize biological synthesis and processing of polymers as a route to gain insight into topics such as molecular recognition, self-assembly and the formation of materials with…
Small-angle x-ray scattering, nitrogen adsorption, and scanning tunneling microscopy show that a series of activated carbons host an extended fractal network of channels with dimension D(p) = 2.8-3.0 (pore fractal), channel width 15-20 A (lower end of scaling), network diameter 3000-3400 A (upper end of scaling), and…
Liquid crystal elastomers (LCEs) have recently been described as a new class of matter. Here we review the evidence for the novel conclusion that the fibrillar collagens and the dragline silks of orb web spiders belong to this remarkable class of materials. Unlike conventional rubbers, LCEs are ordered, rather than di…
Elastic proteins are characterized by being able to undergo significant deformation, without rupture, before returning to their original state when the stress is removed. The sequences of elastic proteins contain elastomeric domains, which comprise repeated sequences, which in many cases appear to form beta-turns. In…
The detailed arrangements of guest species in the interlayers of a cationic and an anionic clay have been determined using molecular dynamics computer simulations. The guest species studied were the amino acids ( S )-phenylalanine and ( S )-tyrosine, chosen for comparison because both anionic and cationic forms are po…
A new method for synthesizing metallic nanowires with diameters in the range of 10−100 Å has been reported. This methodology is based on a combination of electroless deposition and template synthesis using ordered mesoporous materials. High-density metallic nanowires of copper and nickel were obtained.
Platelets were coated with 78-nm silica nanoparticles, 45-nm fluorescent nanospheres, or bovine immunoglobulin G (IgG) through layer-by-layer assembly by alternate adsorption with oppositely charged linear polyions. Sequential deposition on platelet surfaces of cationic poly(dimethyldiallylammonium chloride) and anion…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTPoly(p-xylylene) Nanotubes by Coating and Removal of Ultrathin Polymer Template FibersHaoqing Hou, Zeng Jun, Arndt Reuning, Andreas Schaper, Joachim H. Wendorff, and Andreas GreinerView Author Information Philipps-University Marburg…
An irreversible phase transformation (PT) from the rhombohedral phase of boron nitride rBN to cubic cBN was recently recorded at the surprisingly low pressure of 5.6 GPa at room temperature. In this paper, a very nontrivial and unexpected explanation of this phenomenon is found, based on our criterion for the PT in pl…
Abstract The mechanical properties and crosslink density of peroxide‐cured ethylene‐propylene‐diene rubber (EPDM) reinforced with zinc dimethacrylate (ZDMA) were studied. ZDMA was in situ prepared in EPDM matrix through the neutralization reaction of zinc oxide (ZnO) and methacrylate acid (MAA). The effect of ZnO/MAA…