Materials Literature
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The hyperthermophilic archaeon Pyrococcus furiosus can utilize different carbohydrates, such as starch, maltose and trehalose. Uptake of alpha-glucosides is mediated by two different, binding protein-dependent, ATP-binding cassette (ABC)-type transport systems. The maltose transporter also transports trehalose, wherea…
A novel synthetic process was developed to yield optically active polyaniline derivatives (PANIs) prepared by electron acceptor, 2,3-dichloro-5,6-dicyanobenzoquinone (DDQ), using either (+)- or (−)-camphorsulfonic acid (CSA) as the chiral inductor in organic media. Either thin films of PANIs/(+)-CSA and PANIs/(−)-CSA…
We analyze various potential environments such as electrodes, substrates, gate voltages, and flattening deformations in single-wall C nanotubes in terms of circumferential perturbations on nanotube surfaces. Considering the periodicity of perturbations, we derive selection rules in the subband mixing caused by perturb…
Abstract This study reports the results of investigations on blends of silicone rubber and fluororubber based on tetrafluoroethylene/propylene/vinylidene fluoride terpolymer and the effects of replacement of silicone rubber and/or fluororubber in their 50/50 blend by the respective vulcanizate powders of known composi…
Abstract The formation of covalent bonds between silanols in copolymer and those in silica prevents organic–inorganic phase separation. Two series of hybrid composite materials, poly(vinyl acetate‐ co ‐vinyl trimethoxysilane)/TEOS and poly[vinyl acetate‐ co ‐3‐(trimethoxysilyl)propyl methacrylate]/TEOS, were fabricate…
To better characterize the cis state and the reorientation processes in polymers containing azobenzene groups, the in situ dynamics of photoinduced orientation of a polymer with azobenzene groups bearing no donor and acceptor substituents such as poly[4-[2-(methacryloyloxy)ethyl]azobenzene] polymer (pMEA) was carried…
The pressure-induced structural changes of single-wall carbon nanotubes organized into two-dimensional crystalline bundles are studied by neutron diffraction up to $\ensuremath{\sim}50 \mathrm{kbar}.$ The strong variation of the (10) Bragg peak position with pressure is interpreted as a progressive deformation of the…
Abstract We prepared pullulan/poly(vinyl alcohol) (PVA) blend films by casting the polymer solution in dimethyl sulfoxide. Their morphology and mechanical properties were investigated. Scanning electron micrographs revealed that the pullulan was immiscible with PVA over the entire composition range. The tensile streng…
Methyltrioxorhenium(VII) (MTO) forms octahedral adducts with bidentate Lewis bases. These complexes were isolated and fully characterized, including X-ray crystallography. The compounds display distorted octahedral geometry in the solid state with a tendency of disorder concerning the Re central atom. At elevated temp…
Abstract The tensile properties of Argiope trifasciata (Argiopidae) drag line silk retrieved from mooring threads in the web were characterized. Scanning electron microscope images were used to determine the cross‐sectional area of the samples, allowing force‐displacement plots to be rescaled as stress–strain curves a…
Abstract The nonisothermal crystallization kinetics of polyoxymethylene (POM), polyoxymethylene/Na–montmorillonite (POM/Na–MMT), and polyoxymethylene/organic–montmorillonite (POM/organ–MMT) nanocomposites were investigated by differential scanning calorimetry at various cooling rates. The Avrami analysis modified by J…
Photosensitization of Porphyrins and Phthalocyanines covers the scentific background to porphyrins and phthalocyanines, and applications of the compounds, especially for the application for photosensitization. It also has a review of advances in research and applications in this field.
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTSingle-Molecule Magnets: Ligand-Induced Core Distortion and Multiple Jahn−Teller Isomerism in [Mn12O12(O2CMe)8(O2PPh2)8(H2O)4]Colette Boskovic, Maren Pink, John C. Huffman, David N. Hendrickson, and George ChristouView Author Information Department of Chemistry and the…
A novel approach to highly ordered and modular nanoelectrode arrays (NEAs) has been developed using block copolymer self-assembly. Variable scan rate cyclic voltammetry studies were performed to characterize the NEA. At low scan rates, the NEA behaves similar to a macroelectrode, while at high scan rates the nanoelect…
Amino acids involved in cottonseed protein cross-linking by formaldehyde, glutaraldehyde, and glyoxal during protein film formation were identified by an original technique. The entire HPLC amino acid profile (after acid hydrolysis) was studied, along with variations in reactive lysine contents, in films cross-linked…
Within a phase field approach which takes the strain-induced elasticity into account, the kinetics of the coherent order-disorder transition is investigated for the specific case of $Al_3 Zr$ alloy. It is shown that a microstructure with cubic $L1_2$ precipitates appears as a transient state during the decomposition o…
It is shown that the appearance of a multidimensional potential energy surface, or potential energy landscape, can be related to the form of the interatomic or intermolecular potential. Catastrophe theory enables us to describe how the geometry of the surface changes with parameters in the potential, and provides univ…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTBismuth Nanotubes: A Rational Low-Temperature Synthetic RouteYadong Li, Junwei Wang, Zhaoxiang Deng, Yiying Wu, Xiaoming Sun, Dapeng Yu, and Peidong YangView Author Information Department of Chemistry Tsinghua-Foxconn Nanotechnology Laboratory and the Key Laboratory of…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTDistinct Complex Precipitating from Racemic Solution of Poly(β-benzyl l-aspartate) and Poly(β-benzyl d-aspartate)Kou-ichi Sakajiri, Ei-ichi Kawasaki, and Junji WatanabeView Author Information Department of Organic and Polymeric Mate…
A novel method for fabricating optical channel waveguides in Ga:La:S chalcogenide glass, through continuous wave direct UV laser writing (λ = 244 nm) is reported. Well-formed singlemode channel structures, with low propagation losses of 0.38 ± 0.05 dB/cm at 1.3 µm, were engineered using this technique.