Materials Literature
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Single crystals of gallium tris(8-hydroxyquinoline) (Gaq3) were obtained. The X-ray diffraction study showed that the Gaq3 solid is an extensive three-dimensional framework which is constructed from the intermolecular π−π stacking and hydrogen-bonding interactions.
The isocyanides 3-(4-pyridylethynyl)phenylisocyanide, 3, 4-(4-pyridylethynyl)phenylisocyanide, 6, 2,6-diisopropyl-4-(4-pyridylethynyl)phenylisocyanide, 9, and 2,6-diisopropyl-4-(4-pyridyl)phenylisocyanide, 11, were prepared. With PdI(2) and PtI(2), these isocyanides form the complexes trans-[MI(2)(CNR)(2)], 12-19 (M =…
This paper describes the self-assembly of hydrogen-bonded polymeric rods based on the lattice of cyanuric acid and melamine (CA·M). Data from 1 H NMR spectroscopy, IR spectroscopy, gel permeation chromatography (GPC), and transmission electron microscopy (TEM) are interpreted as indicating that the self-assembly of a…
The +4 charged dye tetramethylpyridylporphyrin, TMPyP (≡H 2 TMPyP 4+ ), and the metallo ZnTMPYP are water-soluble. The cationic TMPy groups are nearly perpendicular to the plane of the porphine. When the dyes were applied to the layered inflatable clay mineral Laponite a ∼30 nm red shift in the spectrum of both TMPyP−…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDendrimers Containing Heteroatoms (Si, P, B, Ge, or Bi)Jean-Pierre Majoral and Anne-Marie CaminadeView Author Information Laboratoire de Chimie de Coordination du CNRS, 205, route de Narbonne, 31077 Toulouse Cedex 4, France Cite this: Chem. Rev. 1999, 99, 3, 845–880Publicati…
Ordered mesoporous polymers have been prepared by replication of colloidal crystals made from silica spheres 35 nanometers in diameter. The pores in the colloidal crystals were filled with divinylbenzene (DVB), ethyleneglycol dimethacrylate (EDMA), or a mixture of the two. Polymerization and subsequent dissolution of…
Regioregular polymers poly[4,4‘-bis(butylsulfanyl)-2,2‘-bithiophene] ( P1 ) and poly[4,4‘-bis(octylsulfanyl)-2,2‘-bithiophene] ( P2 ) were prepared from 4,4‘-bis(butylsulfanyl)- and 4,4‘-bis(octylsulfanyl)-2,2‘-bithiophene, by oxidative polymerization with FeCl 3, and characterized by 1 H and 13 C NMR, FT-IR, and UV−v…
To study the phase size/interfacial tension relationship for LLDPE/PVC blends over a wide range, three modifiers of widely varying efficacy were chosen based on a cursory analysis of their acid−base interactions with the blend system. The modifiers used were poly(isoprene−4-vinylpyridine) (PIP−P4VP), poly(styrene−acry…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTModeling the Phase Behavior of Polymer/Clay NanocompositesAnna C. Balazs, Chandralekha Singh, Ekaterina Zhulina, and Yulia LyatskayaView Author Information Department of Chemical Engineering, University of Pittsburgh, Pittsburgh, Pennsylvania 15261 Cite this: Acc. Chem. Res.…
Nanocrystalline metals, i.e. metals in which the grain size is in the nanometer range, have a range of technologically interesting properties including increased hardness and yield strength. We present atomic-scale simulations of the plastic behavior of nanocrystalline copper. The simulations show that the main deform…
To achieve solvent-free polymer electrolytes with high ionic conductivity, network polymer electrolytes with hyperbranched ether side chains were synthesized. A monosubstituted epoxide monomer, 2-(2-methoxyethoxy)ethyl glycidyl ether (MEEGE), was copolymerized with ethylene oxide (EO) in the presence of 2-(2-methoxyet…
Macroscopically oriented ferroelectric liquid crystalline elastomers were prepared by UV-induced cross-linking of the corresponding polymer. Time-resolved FT-IR spectroscopy is employed to analyze structure and mobility in these materials on the level of the different molecular moieties. The influence of cross-linking…
The transport properties of aqueous solutions of the three disaccharides sucrose, maltose and trehalose are investigated by viscosity and NMR measurements. The aim is to clarify the reasons that make trehalose the most effective in protecting organisms from dehydration and freezing. The study indicates that, in compar…
Two-dimensionally organized CdS nanoparticle films were prepared with the use of the Langmuir−Blodgett (LB) technique. 2-Aminoethanethiol-modified CdS nanoparticles were spread on a water subphase which contained glutaraldehyde as a cross-linking agent for binding the surface-modified CdS nanoparticles with each other…
Quasielastic neutron scattering experiments have been performed on polyisobutylene, trans -1,4-polychloroprene, and polyethylene in the energy range from 0.01 to 10 meV at temperatures far above the glass transition temperature T g and on cis -1,4-polybutadiene near T g . Similar to the previously reported results on…
The oxidation of five polyamines (ethylenediamine, putrescine, cadaverine, spermine, and spermidine) was investigated at polycrystalline, boron-doped, diamond thin-film electrodes using cyclic voltammetry and flow injection analysis (FIA) with amperometric detection. Cyclic voltammetry of the polyamines was conducted…
Vapour cavities in liquid flows have long been associated with cavitation damage to nearby solid surfaces and it is thought that the final stage of collapse, when a high- speed liquid jet threads the cavity, plays a vital role in this process. The present study investigates this aspect of the motion of laser-generated…
Optically Stimulated Luminescence (OSL) dosimetry is attractive to the health physics and dosimetry community due to its all-optical character, fast data acquisition and the avoidance of heating the detector. Until recently there was no luminescent material sensitive enough to radiation, and at the same time suitable…
Experimental solubilities are reported for anthracene dissolved in ternary 2-ethoxyethanol + cyclohexane + heptane, 2-ethoxyethanol + cyclohexane + 2,2,4-trimethylpentane, 2-butoxyethanol + cyclohexane + heptane, and 2-butoxyethanol + cyclohexane + 2,2,4-trimethylpentane solvent mixtures at 25 °C. Nineteen composition…
The purpose of this study was to purify, crystallize, and characterize by X-ray diffraction an amaranth globulin for its subsequent structure elucidation. A 36-kDa amaranth globulin was extracted by sequential precipitation and purified by gel filtration and cationic exchange columns. It was crystallized at 18 degrees…