Materials Literature
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The electronic structures of the mono- and bisammonia adducts EH3NH3 and EH3(NH3)2, E = B and Al, have been investigated using ab initio electronic structure methods. Geometries were optimized at the MP2/cc-pVTZ level. Higher-level correlated methods (MP4(SDTQ), QCISD(T), CCSD(T)), as well as the G2 and CBS-Q methods,…
Zinc− and magnesium−manganese oxide particles have been grown in the pores of MCM-41 using a procedure adapted from a mild synthesis for layered manganese oxides. The Mn-modified silicates were analyzed by powder X-ray diffraction (XRD), transmission electron microscopy (TEM), energy dispersive spectroscopy (EDS), N 2…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTThe Stepwise Four- and Six-Electron Reduction of Carbon Monoxide to Oxyalkylidyne, to Carbide and Oxide, Then to Carbide over an Nb−Oxo Surface Modeled by Calix[4]arene1Alessandro Caselli, Euro Solari, Rosario Scopelliti, and Carlo FlorianiView Author Information Insti…
Using temperature-dependent Fourier transform infrared (FTIR) spectroscopy, we probe the molecular level, chain-structural dynamics associated with solid−solid transitions between 25 and 250 °C in a layered inorganic−organic silver dodecanethiolate, AgS(CH 2 ) 11 CH 3 . Spectroscopic evidence presented here establishe…
ADVERTISEMENT RETURN TO ISSUECommunication to the...Communication to the EditorNEXTNovel Strategy for Polymer Blend Compatibilization: Solid-State Shear PulverizationNaomi Furgiuele, Andrew H. Lebovitz, Klementina Khait, and John M. TorkelsonView Author Information Department of Chemical Engineering and Polymer Techno…
This paper describes the synthesis of polystyrene (PS) brushes on silicate substrates via carbocationic polymerization from self-assembled monolayers (SAMs). Carbocationic initiators, 2-(4-(11-triethoxysilylundecyl)phenyl-2-methoxypropane and 2-(4-trichlorosilylphenyl)-2-methoxy- d 3 -propane, and their corresponding…
Multiarm block copolymers were synthesized via anionic ring-opening multibranching polymerization (ROMBP) of glycidol followed by addition of propylene oxide. The resulting polyether−polyols with molecular weights in the range 5000−12 000 g/mol possessed up to five propylene oxide units per end group and showed narrow…
We study the range of orientational order of a single layer of cylindrical block copolymer microdomains annealed on several types of substrates. The orientational persistence length or nematic correlation length (ξ) is evaluated using recently developed imaging and analysis methods to measure the grain size of the blo…
It is shown that the Abrikosov's vortex solution or its corresponding two-particle pair potential is not the solution of the self-consistency equation in Gor'kov's formalism. Since the self-consistency equation leads to a superposition of different types of off-diagonal long-range order (ODLRO) instead of one type of…
Multilayer thin films of sequentially adsorbed polyelectrolytes were utilized as nanoreactors for both metallic (Ag) and semiconductor nanoparticles (PbS). Polyelectrolyte multilayers with a controlled content of free carboxylic acid binding groups were fabricated with weak polyelectrolytes via suitable pH adjustments…
Utilization of layered polyelectrolyte films as sensor or ion-separation materials will depend critically on their stability and ion permeability in aqueous solution. We report electrochemical and in situ ellipsometric studies on the permeability and stability of poly(allylamine hydrochloride)/poly(styrenesulfonate) (…
The co-condensation of tetraethoxysilane (TEOS) and organotrialkoxysilane molecules by neutral alkylamine surfactant assembly (S 0 I 0 ) is a convenient synthesis methodology for the one-step preparation of organically functionalized mesostructured materials. Two distinct approaches were considered for the formation o…
We have studied the compression and structure of compressed monolayers of sulfate polystyrene latex particles on air/water and octane/water interfaces. If compressed sufficiently (on a Langmuir trough) the monolayers at air/water surfaces give rafts of hexagonally packed particles, while those at oil/water interfaces…
This report describes the effect of solvent refractive index and core charge on the surface plasmon absorbance of alkanethiolate monolayer-protected gold clusters (MPCs). Solution spectra of dodecanethiolate MPCs (5.2 nm average diameter) reveal an 8-nm shift in plasmon band position as the solvent refractive index is…
Freon gas as chlorofluorocarbon or hydrofluorocarbon has been used as a refrigerant in air-conditioning systems. In particular, dichlorodifluoromethane (R12) and 1,1,1,2-tetrafluoroethane (R134a) have been widely used because of their outstanding chemical stability. Although they are being severe restricted because of…
The growth of many epitaxial thin-film oxides is significantly enhanced with the use of an oxidizing agent such as atomic oxygen, ozone, or NO2. We developed a flow-through microwave plasma source to generate large atomic oxygen fluxes while maintaining vacuum pressures of less that 1×10−4 Torr. Continuous and real-ti…
For a class of (Pb, La)(Zr, Ti)O3 ferroelectric thin films, the Merz equation adequately describes the dynamics of switching resistance. A single parameter, activation field, can be used to relate the coercive field throughout the polarization fatigue process. We suggest that the increased switching resistance causes…
The effect of curing history on the residual stress behaviors in semiflexible structure poly(4,4′-oxydiphenylene pyromellitimide) (PMDA–ODA) and rigid structure poly(p-phenylene biphenyltetracarboximide) (BPDA–PDA) polyimide was investigated. Depending upon the curing history and different structures of polyimide, the…
Various copolyesters were synthesized by bulk polycondensation of the respective combinations of 1,4;3,6-dianhydro-D-glucitol (1) as the diol component and 1,1-bis[5-(methoxycarbonyl)-2-furyl]ethane (3b) and seven dimethyl dialkanoates with methylene chain lengths of 4, 5, 6, 7, 8, 10, and 12 (4a–4g) as the dicarboxyl…
Polyaniline–epoxy novolac resin composite materials (PANI–RESIN) were prepared by emulsion polymerization technique and characterized by infrared and electronic absorption spectra, conductivity, particle size, and thermogravimetric and differential scanning calorimetric analysis. The conductivity of PANI–RESIN samples…