Materials Literature
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The thermal expansion behaviour of polymer composites having a matrix of polystyrene containing aluminium nitride (AlN) reinforcement has been investigated under a special dispersion state of filler in the composite: AlN filler particles surrounding polystyrene matrix particles. It is found that the coefficient of the…
A series of fully methylthiolated bi-, ter-, and quatertetrathiafulvalenes have been synthesized using cross- and homocoupling reactions of tetrathiafulvalenylzinc derivatives; the tetracation-tetraradical derived from the helical tetrathiafulvalene tetramer exhibits an intramolecular association of the terminal catio…
The morphology of thin films of asymmetric block copolymers of poly(isoprene- block -ferrocenyldimethylsilane) was studied using atomic force microscopy, transmission electron microscopy, and optical microscopy. Block copolymers with the organometallic (ferrocenylsilane) phase between 20 and 28 vol % were investigated…
Electric field-induced transient pore formation (reversible electroporation) in the bilayer membrane of synthetic large unilamellar vesicles (LUV) is used as a novel method for the preparation of angstrom size quantum dots of the indirect band gap semiconductor AgBr. With Ag + ions encapsulated in 178 nm diameter LUVs…
ADVERTISEMENT RETURN TO ISSUEPREVAddition/CorrectionORIGINAL ARTICLEThis notice is a correctionConducting Polymer Nanocomposites: A Brief OverviewRupali Gangopadhyay and Amitabha DeCite this: Chem. Mater. 2000, 12, 7, 2064Publication Date (Web):June 23, 2000Publication History Published online23 June 2000Published ini…
Azobenzene chromophores are promising as molecularly engineered materials for reversible optical data storage based on molecular reorientation. In this paper, the optical properties of several different azobenzene chromophores are studied using molecular quantum calculations. Special emphasis is put on molecular aniso…
Among many types of nonlinear optical (NLO) polymers developed, this paper has focused on azo-dye-functionalized polymers and discussed their channel waveguide fabrication for photonic applications. After examining the critical issues of the polymer waveguide fabrication, serially-grafted quasi-phase-matching waveguid…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTNitric Oxide Addition to the Ferrous Nitrosyl Porphyrins Fe(P)(NO) Gives trans-Fe(P)(NO)2 in Low-Temperature SolutionsIvan Lorković and Peter C. FordView Author Information Department of Chemistry and Biochemistry University of California, Santa Barbara Santa Barbara,…
Tin doped indium oxide (In 2 O 3 :Sn) or indium tin oxide (ITO) thin films have been successfully deposited by the low cost spray-pyrolysis method. Low sheet resistance and high mobility films were obtained when the films were deposited at the substrate temperature of 793 K. The direct optical bandgaps for the films d…
The first unsymmetrical conjugated dendrimer was synthesized using a rather simple approach that involves only one synthon and two sets of reaction conditions. This dendrimer shows broad absorption in the UV and visible range and possesses an intrinsic energy gradient from the outside branches to the core, naturally s…
Simple thermodynamic arguments are evoked to show that the pressure dependence of the Flory interaction parameter of miscible polymer blends, as derived from small-angle neutron scattering experiments, is directly related to the volume changes on mixing for these systems. This approach is validated by comparison to av…
We report advances for both synthesizing cyclic oligoesters and tailoring their physical properties to make ring-opening polymerization more practical for polyester manufacturing. Solution and suspension methods provide cyclic oligoesters rapidly with high yield and purity. Both methods can be adapted to continuous pr…
FTIR, Raman spectroscopy, and thermogravimetric analysis (TGA) were used to compare the structure and thermal properties of polyoctadecylsiloxane (POS) and octadecyl trichlorosilane (OTS) monolayers. The octadecyl chains in POS had higher conformational and intermolecular order than the same chains of OTS adsorbed as…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTObservation of Local Order in Poly(di-n-alkyl itaconate)sV. Arrighi, A. Triolo, I. J. McEwen, P. Holmes, R. Triolo, and H. AmenitschView Author Information Department of Chemistry, Heriot-Watt University, Edinburgh EH14 4AS, UK; Dip…
Composite polyaniline−silica films produced on glass surfaces during the dispersion polymerization of aniline in the presence of colloidal silica were investigated. The film morphology and composition were characterized by FTIR, UV−vis, and X-ray photoelectron spectroscopies. Compared with pure polyaniline films produ…
Spectacular advances in organometallic chemistry over the past two decades have resulted in single-site catalysts that are revolutionizing production of polyethylene (PE) and isotactic polypropylene (iPP). This report describes an unanticipated benefit of metallocene-catalyzed semicrystalline polyolefins, namely welde…
Single-walled carbon nanotubes (SWNTs) with preferred 2D orientations were synthesized for the first time by chemical vapor deposition (CVD) of methane on silicon surfaces terminated with hydrogen, native oxide, and an ultrathin aluminum layer. The SWNTs grown on Si(100)-based surfaces take two perpendicular direction…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTPatterned Hexagonal Arrays of Living Cells in Sol−Gel Silica FilmsShinye Chia, Jun Urano, Fuyuhiko Tamanoi, Bruce Dunn, and Jeffrey I. ZinkView Author Information Department of Chemistry and Biochemistry Department of Microbiology and Molecular Genetics Department of M…
We report the discovery of an orientational transition of bent-core molecules in a background anisotropic medium, in this case a smectic liquid crystal made of rod-like molecules. The resulting director is apolar in nature, and the medium can be described as an orthogonal biaxial smectic. The detailed phase diagram of…
A recently developed self-consistent effective medium approximation, for composites with a columnar microstructure, is applied to such a three-constituent mixture of isotropic normal conductor, perfect insulator, and perfect conductor, where a strong magnetic field {\bf B} is present in the plane perpendicular to the…