Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTShape-Selective Recognition and Self-Assembly of mm-Scale ComponentsInsung S. Choi, Ned Bowden, and George M. WhitesidesView Author Information Department of Chemistry and Chemical Biology Harvard University, 12 Oxford Street Cambridge, Massachusetts 02138 Cite this: J…
We report the novel cooperative properties of a complex obtained by self-assembling in solution a tetracationic cobalt porphyrin, Co II P 4+, and a tetraanionic sulfoaluminum phthalocyanine, Al III Pc 4- . In the ground state, the complex displays a charge transfer character, Co II-δ P 4+ /(Al III Pc 4- ) +δ, and the…
The cluster formation in nucleating hen egg white lysozyme−NaCl solutions was studied by simultaneous static and dynamic light scattering. Angular dependence measurements of the total scattered intensity and of the average cluster diffusion coefficient revealed the appearance of pronounced structure factor peaks at th…
Atomistic computer simulation techniques are used to investigate the defect properties of the La 2 Ni 1 - x M x O 4 (M = Mn, Fe, Co, Cu) layered perovskite which are related to the mode of operation of the catalyst. The theoretical techniques are based upon efficient energy minimization procedures and Mott−Littleton m…
Adsorption of the phosphate groups on a silica surface is investigated by ab initio calculations of hydrogen-bond complexes of dihydrogen and dimethyl phosphate anions with orthosilicic acid. It is found that the phosphate groups can form strong hydrogen-bonded complexes with the silanols of the silica surface with st…
In polyisocyanates composed only of randomly distributed ( R ) and ( S ) units, the chiral optical properties of the polymer are far out of proportion to the enantiomeric excess of the monomers. This highly disproportionate relationship, which arises from a majority-rule effect among these enantiomeric units on the he…
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…