Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTUnsymmetrical three-dimensional macromolecules: preparation and characterization of strongly dipolar dendritic macromoleculesKaren L. Wooley, Craig J. Hawker, and Jean M. J. FrechetCite this: J. Am. Chem. Soc. 1993, 115, 24, 11496–11505Publication Date (Print):December 1, 19…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSelf-consistent field theory of block copolymers with conformational asymmetryJ. D. Vavasour and M. D. WhitmoreCite this: Macromolecules 1993, 26, 25, 7070–7075Publication Date (Print):December 1, 1993Publication History Published online1 May 2002Published inissue 1 December…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOxide/support interaction and surface reconstruction in the sodium tungstate(Na2WO4)/silica systemZhi Cheng Jiang, Chang Jiang Yu, Xue Ping Fang, Shu Ben Li, and Hong Li WangCite this: J. Phys. Chem. 1993, 97, 49, 12870–12875Publication Date (Print):December 1, 1993Publicati…
Electron cross-sections were summarized for an accurate simulation of the track structure of high energy electrons up to a few MeV in water vapour. Elastic scattering was described by the Rutherford formula taking the screening effect into account. Partial and total ionization cross-sections were calculated using Selt…
Carbon-coated gadolinium carbide nanocrystallites are generated by a process based on the Kratschmer-Huffman carbon-arc method of preparing fullerenes, and a novel magnetic-field-gradient separation technique is used to separate them. This separation of nanocrystalline byproducts of the carbon arc process is a prerequ…
Abstract Novel polymers containing alternating perfluorocyclobutane and aromatic ether subunits are prepared from aryl poly(trifluorovinyl ether) monomers via the thermal [2π + 2π] dimerization of the trifluorovinyl ether functionality. A model study is described, which probes the nature of the perfluorocyclobutane ri…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMolecular electron density Lego approach to molecule buildingP. Duane Walker and Paul G. MezeyCite this: J. Am. Chem. Soc. 1993, 115, 26, 12423–12430Publication Date (Print):December 1, 1993Publication History Published online1 May 2002Published inissue 1 December 1993https:…
Abstract The structures of the series of oligothienyls (T4‐T5‐T6) have been determined and refined from X‐ray powder diffraction data using the Rietveld full‐profile analysis. Unlike polythiophene, all the molecules in the isomorphous series display no internal symmetry, being only approximately planar within 12°. Pac…
Excited-state decays of the special pair of Rhodobacter capsulatus and 10 mutants as a function of temperature are presented. The mutations are at the symmetry-related sites L181 and M208. All the decays are nonexponential, although the degree of nonexponentially depends strongly on the mutant and the temperature. We…
Due to a dependency on the element in the spacer and its substituents, the extent of the interactions between the ferrocene units of the polymer backbone of 1 and 2 can be varied. The electrochemical behavior of 3 in which the ferrocene units are separated by C2 bridges shows that the cooperative interactions are much…
A thin, brittle layer bonded between tougher substrates is susceptible to cracking under residual and applied stresses. Such a crack initiates from an equi-axed flaw, confined by the substrates, tunneling in the brittle layer. Although tunneling is a three-dimensional process, the energy release rate at the front of a…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectronic structures of active sites on metal oxide surfaces: definition of the copper-zinc oxide methanol synthesis catalyst by photoelectron spectroscopyEdward I. Solomon, Paul M. Jones, and Jennifer A. MayCite this: Chem. Rev. 1993, 93, 8, 2623–2644Publication Date (Prin…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSolubilization of some low-polarity organic compounds by hydroxypropyl-.beta.-cyclodextrinXiaojiang Wang and Mark L. BrusseauCite this: Environ. Sci. Technol. 1993, 27, 13, 2821–2825Publication Date (Print):December 1, 1993Publication History Published online1 May 2002Publis…
The synthesis of discotic liquid crystal materials based on the triphenylene core normally involves the preparation of hexahydroxytriphenylene. This has traditionally been accomplished by a chloranil promoted trimerization of 1,2-dimethoxy-benzene followed by demethylation of the hexamethoxytriphenylene produced. Hexa…
We show how the observed transformation behavior of two forms of amorphous solid water can be explained in terms of a first-order phase transition, via a consideration of the limits of metastability associated with this kind of transition. We propose a phase diagram describing amorphous solid water consistent with the…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLuminescence behavior of europium complexes in sol-gel derived host materialsLowell Matthews, R. and Edward T. KnobbeCite this: Chem. Mater. 1993, 5, 12, 1697–1700Publication Date (Print):December 1, 1993Publication History Published online1 May 2002Published inissue 1 Decem…
A computational method was devised to explore the relationship of charge separation, geometry, molecular dipole moment (mu), polarizability (alpha), and hyperpolariz-abilities (beta, gamma) in conjugated organic molecules. We show that bond-length alternation (the average difference in length between single and double…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNonlinear optical chromophores with large hyperpolarizabilities and enhanced thermal stabilitiesChristopher R. Moylan, Robert J. Twieg, Victor Y. Lee, Sally A. Swanson, Kathleen M. Betterton, and Robert D. MillerCite this: J. Am. Chem. Soc. 1993, 115, 26, 12599–12600Publicat…
A kinetic study of cement setting process is presented in this paper A new method which allows the microscopic research of the evolution of the cement hydration applied to the study of three P-350 cuban cements is used. The initial and final values of the specific surfaces of the hydration products and cement were obt…