Materials Literature
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A small-angle neutron scattering (SANS) investigation of matrix chain deformation in an especially designed composite model system for a filled rubber−elastic network is presented. SANS experiments on the structure of polyisoprene homopolymer chains introduced into a well-microphase-separated triblock polyisoprene−pol…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTAssembly of Dynamic Heterometallic Oligoporphyrins Using Cooperative Zinc−Nitrogen, Ruthenium−Nitrogen, and Tin−Oxygen CoordinationHee-Joon Kim, Nick Bampos, and Jeremy K. M. SandersView Author Information University Chemical Laboratory, Lensfield Road, Cambridge CB2 1…
A high dimensional model representation (HDMR) technique is introduced to capture the input−output behavior of chemical kinetic models. The HDMR expresses the output chemical species concentrations as a rapidly convergent hierarchical correlated function expansion in the input variables. In this paper, the input varia…
Nanotube rings were fabricated from straight single-wall carbon nanotubes (SWNTs) with yields exceeding 50%. The rings result from the folding of nanotubes onto themselves under ultrasonic irradiation to form coils with a narrow distribution of radii (300−400 nm). A simple continuum elastic model is used to discuss th…
We have shown experimentally that an electric field decreases the energy separation between the two components of a dense spin-polarized exciton gas in a coupled double quantum well, from a maximum splitting of $\sim 4$ meV to zero, at a field of $\sim $35 kV/cm. This decrease, due to the field-induced deformation of…
The chiral structure of liquid crystalline phases arises due to the intrinsic chirality of the constituent mesogens. While it is seemingly straightforward to quantify the macroscopic chirality by using, for instance, the cholesteric pitch or the optical rotatory power, it is not as simple to quantify the chirality of…
A phosphorus(V) complex of tetra-tert-butylphthalocyanine was prepared. The blue complex showed B and Q bands at 350 and 660 nm with a fluorescence peak at 680 nm in chloroform. In a CV, the complex showed three oxidative and three reductive waves. The following depicted here was tentatively proposed.
The adsorption of H or F species on B vs N atoms on the h-BN (001) surface has been investigated theoretically within the DFT method, using a cluster approach. Only the boron atoms were subjected to a local transformation from hexagonal to cubic phase. It occurred either upon the adsorption of F species or the adsorpt…
The application of surface plasmon resonance (SPR) measurements to the study of ultrathin organic films adsorbed onto gold surfaces utilizing near-infrared (NIR) excitation from a Fourier transform (FT) spectrometer is described. The FT-SPR experiment measures the NIR reflectivity spectrum from a prism/gold film/water…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorToward Molecular Muscles: Design and Synthesis of an Electrically Conducting Poly[cyclooctatetrathiophene]Michael J. Marsella and Rodney J. ReidView Author Information Department of Chemistry, University of California at Riverside, Rive…
A series of homoleptic cations of Rh(I,II), Rh(II), and Rh(III) have been synthesized and characterized in the solid-state and in solution. Three new dinuclear compounds of dirhodium(II,II) were prepared by treatment of Rh 2 (O 2 CCH 3 ) 4 (L) 2 with Et 3 OBF 4 or Me 3 Si(CF 3 SO 3 ) in acetonitrile or propionitrile.…
Molecular nanowires inside single-walled carbon nanotubes are produced by capillary filling. Bismuth was drawn into single-walled carbon nanotubes, where it formed single-crystal nanowires of nanometer dimensions. Metal was introduced in its gas, solution, and solid phases, with the solution phase process the most eff…
Two Laponite clays, of general formula [M n + ] x / n [Li x Mg 6 - x Si 8 O 20 F y (OH) 4 - y ], were prepared with different Li + levels (0.57 and 0.70% w/w) and F - levels (9.5 and 9.9% w/w). The clays were characterized by measurements of nitrogen adsorption isotherms, cation exchange capacity, and conductometric t…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTProgrammed Assembly of DNA Functionalized Quantum DotsGregory P. Mitchell, Chad A. Mirkin, and Robert L. LetsingerView Author Information Department of Chemistry, Northwestern University 2145 Sheridan Rd., Evanston, Illinois 60208 Cite this: J. Am. Chem. Soc. 1999, 121…
A mixture of the 8-O-beta-D-glucopyranoside of omega-hydroxyxanthorin 1-O-methyl ether (3) and the 8-O-beta-D-gentiobioside of xanthorin 1-O-methyl ether (4) was isolated from the water-soluble extractives of the Australian toadstool Dermocybe sp. WAT 22963. Compounds 3 and 4 were identified by characterization of the…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationA Pyropheophorbide Dimer with Single Pyrrole π Overlap and a Low-Energy Q AbsorptionSpencer Knapp, Buwen Huang, Thomas J. Emge, Suzie Sheng, Karsten Krogh-Jespersen, Joseph A. Potenza, and Harvey J. SchugarView Author Information Department of Chemistry RutgersThe State Un…
The two-dimensional phase behavior of mixed-monolayers composed of poly(amidoamine) (PAMAM) dendrimers and n -alkylthiols adsorbed to Au(111) surfaces was studied using tapping mode atomic force microscopy (TM-AFM). Mixed-monolayers were prepared by sequential immersion of Au(111) substrates into ethanolic solutions o…
The influence of stereoregularity of polypropylene on the miscibility with the ethylene−1-hexene copolymer (EHR) whose 1-hexene content is 57 mol % was studied by means of viscoelastic measurements, electron microscopic observation, and so on. In this study, two types of polypropylenes were used; one is an isotactic p…
The mixed-valence diiron centers of nitrosyl derivatives of deoxy hemerythrin have been studied by variable-temperature variable-field Mössbauer spectroscopy. The adduct formed by the reaction of deoxy hemerythrin (deoxyHr) with nitric oxide (deoxyHrNO) produced spectra consistent with a binuclear center of the form F…
Two new conjugated oligoquinolines, 2,2‘-bis(4-phenylquinoline)-1,4-phenylene (2a) and 2,2‘-bis(4-phenylquinoline)-4,4‘-biphenylene (2b), were synthesized and found to crystallize in a monoclinic lattice with different unit cell parameters and space groups. Single-crystal X-ray crystal structures revealed intermolecul…