Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSurface Activity of Poly(ethylene oxide)-block-Poly(propylene oxide)-block-Poly(ethylene oxide) CopolymersPaschalis Alexandridis, Vassiliki Athanassiou, Shinya Fukuda, and T. Alan HattonCite this: Langmuir 1994, 10, 8, 2604–2612Publication Date (Print):August 1, 1994Publicat…
We have solved, refined, and analyzed the 2.0-å resolution crystal structure of a 1:1 complex between the bacterial ribonuclease, barnase, and a Cys-->Ala(40,82) double mutant of its intracellular polypeptide inhibitor, barstar. Barstar inhibits barnase by sterically blocking the active site with a helix and adjacent…
This paper presents a review of recent work on the development of organic salts for second-order nonlinear optical applications. In particular, salts in which the cation has been designed to have a large molecular hyperpolarizability and in which variation of the counterion facilitates preparation of crystals with the…
Carbon nanotubes of uniform size may soon be available in macroscopic quantities. Here we examine the ordered condensed phase of these tubes. As the tube diameter varies, the structural properties show a clear transition between two regimes with qualitatively different behavior. Tubes 10 \AA{} and less in diameter beh…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLiving Radical Polymerization of Acrylates by Organocobalt Porphyrin ComplexesBradford B. Wayland, George Poszmik, Shakti L. Mukerjee, and Michael FrydCite this: J. Am. Chem. Soc. 1994, 116, 17, 7943–7944Publication Date (Print):August 1, 1994Publication History Published on…
The catalytic treatment of motor vehicle exhaust gas has been a feature of all passenger cars in the USA since the 1975 model year. It has since been adopted in all the developed countries as the principal means of con-trolling the emissions from vehicles powered by Otto-cycle internal com-bustion engines. These inclu…
This article presents measurements of piezoelectric coefficients of lead zirconate titanate (PZT) thin films. The normal load method is used to measure the coefficients for PZT films with various compositions prepared by the sol-gel technique or by organometallic chemical vapor deposition (OMCVD). The as-deposited OMC…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFluorescence and Absorption Spectroscopic Properties of Dipyrrometheneboron Difluoride (BODIPY) Derivatives in Liquids, Lipid Membranes, and ProteinsJan Karolin, Lennart B.-A. Johansson, Leif Strandberg, and Tor NyCite this: J. Am. Chem. Soc. 1994, 116, 17, 7801–7806Publicat…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSize-Selective Synthesis of Nanostructured Transition Metal ClustersManfred T. Reetz and Wolfgang HelbigCite this: J. Am. Chem. Soc. 1994, 116, 16, 7401–7402Publication Date (Print):August 1, 1994Publication History Published online1 May 2002Published inissue 1 August 1994ht…
Phenomenologically, a primary dopant for a conducting polymer is a substance, a relatively small quantity of which drastically changes the electronic, optical, magnetic and/or structural properties of the polymer and is accompanied by a large increase in conductivity. De-doping results in a reversal of the newly induc…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTApplication of Carbon Nanotubes as Supports in Heterogeneous CatalysisJ. M. Planeix, N. Coustel, B. Coq, V. Brotons, P. S. Kumbhar, R. Dutartre, P. Geneste, P. Bernier, and P. M. AjayanCite this: J. Am. Chem. Soc. 1994, 116, 17, 7935–7936Publication Date (Print):August 1, 19…
Improved synthetic routes and size-selective precipitation have enabled the preparation of almost monodisperse CdS clusters. Six samples of 1-thioglycerol stabilized clusters with diameters of approximately 13, 14, 16, 19, 23, and 39 Å have been prepared as fully redispersible powders and were characterized by element…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTConnection between Polymer Molecular Weight, Density, Chain Dimensions, and Melt Viscoelastic PropertiesL. J. Fetters, D. J. Lohse, D. Richter, T. A. Witten, and A. ZirkelCite this: Macromolecules 1994, 27, 17, 4639–4647Publication Date (Print):August 1, 1994Publication Hist…
The results of studies on the structures of more than 50 new crystals of germanates, gallates, borogermanates, borates, and silicates, possessing laser, piezoelectric, ferroelectric, and ion-conducting properties, are presented. The structure-property relations are considered. The bibliography includes 71 references.
The experimental results, band structure calculations, and theoretical investigations carried out within the framework of the many-electron models of half-metallic ferromagnets (HMFs) are reviewed. These materials have an energy gap for one of the spin projections at the Fermi level and represent a separate class of s…
Abstract The kinetics of phase‐transfer catalyzed free‐radical polymerization of acrylonitrile (AN) was carried out with water‐soluble initiator peroxomonosulphate (PMS) with phase‐transfer catalysts (tetrabutylammonium chloride and benzyltributylammonium chloride (TBAC and BTBAC) in tolune/water two‐phase systems in…
Abstract High T g polyimides containing pendant phenolic hydroxyl groups were synthesized in high molecular weight via one‐step solution polymerization of the dihydrochloride salt of 4,6‐diaminoresorcinol with various commercially available dianhydrides. Polymerization proceeds via initial dissociation of diaminoresor…
Abstract Thermotropic copolyester fibers of oxynaphthoate and oxybenzoate have been subjected to conditions that promote solid‐state polymerization as well as annealing. The annealing process causes the crystals to perfect with a simultaneous increase in heat of fusion and melting temperature. Solid‐state polymerizati…
Abstract Siloxane urethane block copolymers were prepared with siloxanes as the soft segment. Films were cast from a variety of solvents. Solvent has an effect on the segregation of soft and hard segments. Surface studies, including ESCA, EDS, and FT‐IR, show well segregated block copolymers with enhanced siloxane on…
Abstract The copolymers containing photoreactive 4‐methyl coumarin pendant groups have been prepared by radical copolymerization of N ‐(1‐phenylethyl)acrylamide (M 1 ) and 7‐acryloyloxy‐4‐methyl coumarin (M 2 ) in DMF at 70°C. The monomer reactivity ratios (MRR) of M 1 and M 2 are estimated by Finenam‐Ross, Kelen‐Tüdo…