Materials Literature
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Abstract A series of aliphatic poly(carbonate‐ co ‐phosphate)s was synthesized in bulk using aluminium isopropoxide as initiator by ring‐opening polymerization with various cyclic carbonates (trimethylene carbonate (TMC) and 5,5‐dimethyltrimethylene carbonate (DTC)) and cyclic phosphates (ethylene ethyl phosphate (EEP…
Three newly elucidated crystal structures of group IV phthalocyaninato complexes are reported, along with data for two further SiPc carboxylate complexes. In one of these crystal structures, bis(undecylcarboxylate)Sn(IV) phthalocyanine, the tin ion is seven coordinate, which is a unique finding for this atom in phthal…
The selected-area electron diffraction technique has been used to investigate the structure of bundles of single-wall carbon nanotubes synthesized by the catalytic chemical vapor deposition method. The helicity and lattice packing of the single-wall carbon nanotubes within the bundles have been deduced from the experi…
Nanotubular materials inspired by crystalline diborides such as ${\mathrm{AlB}}_{2}$ are proposed. The atomic structure, in particular the basic chemical question of where to put Al atoms in order to stabilize nanotubular Al-B systems, is investigated using density-functional calculations for prototype systems. The op…
Recent processing technologies have employed the in situ polymerization of organic monomers to consolidate particulate suspensions of ceramics into dense and strong bodies. The same principle has been applied to solidify foamed ceramic suspensions with great success. In this work, the parameters that influence the pol…
Transition metal complexes of 2-[4'-(2,2':6',2' '-terpyridyl)]-(4,4,5,5-tetramethylimidazolinyl-3-oxide-1-oxyl) (terpy-NIT) and 2-[4'-(2,2':6',2' '-terpyridyl)]-(4,4,5,5-tetramethylimidazolinyl-1-oxyl) (terpy-IM) have been prepared. Whereas the pyridyl fragments of the free ligands are in an anti conformation, the com…
Abstract To increase their adhesion to silver, polyimide (PI) surfaces were modified by sulfonation reactions by means of different experimental procedures. The results of these modification reactions were analyzed in terms of the variation of the surface chemical composition examined by X‐ray photoelectron spectrosco…
The reaction of (NBu(4))(2)[Pt(C triple bond CPh)(4)] with Cd(ClO(4))(2).6H(2)O in a 1:1 molar ratio yields a white solid [PtCd(C triple bond CPh)(4)](n) 1 (75% yield) together with yellow crystals of a very unusual decanuclear platinum-cadmium cluster [Pt(4)Cd(6)(C triple bond CPh)(4)(mu-C triple bond CPh)(12)(mu(3)-…
Abstract Free‐standing films of polyaniline (PANI), in an emeraldine base state, prepared by evaporation of polymer solutions in N ‐methylpyrrolidone (NMP) retain solvent even under dynamic vacuum drying as indicated by transmission Fourier transform infrared (FTIR) spectroscopy, where a band at 1670 cm −1 is clearly…
The interaction of a water molecule with a neutral oxygen vacancy on the MgO(100) surface is studied in the limit of very low coverage by total-energy calculations and molecular-dynamics simulations based on the density-functional theory. Exchange and correlation effects are treated within the generalized gradient app…
Carbon nitride $({\mathrm{CN}}_{x})$ films were deposited by reactive sputtering to study the effect of the ion bombardment during deposition (IBD) on their bonding structure. Fourier-transform infrared (IR) ellipsometry (FTIRE) was used to identify and distinguish the characteristic bands of the ${\mathrm{sp}}^{3}$ $…
A high-temperature Raman study of ${\mathrm{Ge}}_{x}{\mathrm{S}}_{1\ensuremath{-}x}$ alloys is reported up to a temperature close to the melting point, including both Ge-rich $(x=0.35)$ and S-rich $(x=0.20,0.30)$ glasses, as well as the compound glass $(g\ensuremath{-}{\mathrm{GeS}}_{2};$ $x=\frac{1}{3}).$ The variati…
We report a large scale synthesis of well-aligned carbon nanotube films with controllable diameter and length. A simple technique has been developed to measure anisotropic electrical transport properties of as-aligned carbon nanotube films. The temperature dependence of relative electrical resistances suggests that mo…
Two series of copolyimides, poly(quinoxaline perylene bisimide)s and poly(quinoxaline perylene bisimide ether)s, carrying quinoxaline units and varying amounts of substituted perylene bisimides in the main chain have been synthesized. The polymers were characterized by FT-IR, NMR, UV/vis, and fluorescence spectroscopy…
The identification and characterization of low levels of long-chain-branching (LCB) in essentially linear polyethylenes has attracted significant interest in recent years. One experimental technique is nuclear magnetic resonance (NMR), which can detect LCB in essentially linear polyethylene homopolymers for LCB in the…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTReal Time Reaction Dynamics in Carbon NanotubesToshiya Okazaki, Kazutomo Suenaga, Kaori Hirahara, Shunji Bandow, Sumio Iijima, and Hisanori ShinoharaView Author Information Department of Chemistry, Nagoya University Nagoya 464-8602, Japan Japan Science and Technology C…
Thin films of poly(vinyl alcohol) (PVA) polymer were prepared on a flat, nonporous, poly(styrene) support matrix by adsorption from aqueous solution and were characterized in order to investigate the nonspecific adsorption of proteins to a chromatographically relevant surface. The integrity and surface coverage of the…
We show that D-mode Raman scattering in single-walled carbon nanotubes is due to a double-resonant Raman process. The unusual shift of the D-mode frequency with excitation energy is even expected for a single nanotube. The magnitude of the shift and the D-mode frequency depend strongly on the tube's diameter and chira…
The collective behavior of dislocations in jerky flow is studied in Al-Mg polycrystalline samples subjected to constant strain rate tests. Complementary dynamical, statistical and multifractal analyses are carried out on the stress-time series recorded during jerky flow to characterize the distinct spatio-temporal dyn…
We have implemented a systematic LSDA and $\mathrm{LSDA}+U$ study of the double perovskites ${A}_{2}{\mathrm{FeReO}}_{6}$ $(A=\mathrm{B}\mathrm{a},\mathrm{S}\mathrm{r},\mathrm{C}\mathrm{a})$ and Sr${}_{2}M$MoO${}_{6}$ $(M=\mathrm{C}\mathrm{r},\mathrm{M}\mathrm{n},\mathrm{F}\mathrm{e},\mathrm{C}\mathrm{o})$ for underst…