Materials Literature
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129Xe NMR spectra of xenon dissolved in acetonitrile confined into three mesoporous silica gels with nominal pore diameters of 40, 60, and 100 A have been measured over the temperature range 170-245 K. The spectra consist of a number of lines, which contain detailed information on the system. The most interesting resu…
A homologous series of novel λ-shaped mesogenic compounds in which three mesogenic groups are connected to 3, 4-dihydroxybenzoic acid has been prepared and their physical properties investigated by means of optical microscopy, differential scanning calorimetry and X-ray diffraction measurements. The λ-shaped compounds…
The electronic structure of inorganic solids such as Li(2)Ga and Li(9)Al(4) containing infinite zigzag homoatomic chains is discussed. It is shown that Li(2)Ga, a solid for which a Zintl-type electron-counting approach would suggest that a half-filled pi-type band occurs as in trans-polyacetylene, is really a three-di…
In the title compound, [(C4H9)4N][FeCl4], the central FeIII atom in the anion is tetrahedrally coordinated by four Cl atoms, while the cation exists as a central N atom bonded to four n-butyl groups, also in a tetrahedral arrangement. Both the cation and anion lie on crystallographic twofold axes.
Abstract A novel fluorine‐containing acrylic resin, 4‐trifluoromethylphenyl glycerol dimethacrylate (TPGD), was synthesized and the structure was characterized by FTIR, 13 C NMR, 1 H NMR, and 19 F NMR spectroscopy. The conversion of cure reaction, thermal stability, glass transition temperature ( T g ), and electrical…
Abstract A series of polyamides and poly(amide‐imide)s was prepared by direct polycondensation of ether and nitrile group containing aromatic diamines with aromatic dicarboxylic acids and bis(carboxyphthalimide)s respectively in N ‐methyl 2‐pyrrolidone (NMP) using triphenyl phosphite and pyridine as condensing agents.…
Abstract Complexation of chitosan in aqueous solutions by low molecular weight electrolytes is one of the simplest methods for the preparation of aqueous chitosan dispersions. In this work, the influence of storage time, sulfate concentration, method of preparation and surfactant content on some properties of the resu…
In this research, we fabricated thin films deposited on poly(ethylene terephthalate) (PET) films by a layer-by-layer self-assembly method using a roll-to-roll process and measured the morphology and transmittance of the thin films using atomic force microscopy (AFM) (nanoscope IIIa, Digital Instruments) and UV-vis spe…
A series of N-alkyl-N-methylpyrrolidinium bromide salts (C14, C16, or C18) have been explored as templates for the synthesis of ordered, mesoporous silica films; "soft" annealing based on deep-UV calcination is also reported.
Polymeric complexes based on diblock copolymers (polystyrene-block-4-vinylpyridine) hydrogen bonded with pentadecylphenol self-assemble under oscillatory shear flow into a highly ordered lamellar structure (Ikkala et al. Science 2002). Microtomed films of the lamellar structure form an array of "nanosheets"following i…
Abstract Blends of low‐density polyethylene (LDPE) and poly[ethylene‐ co ‐(vinyl acetate)] (PEVA), crosslinked by electron‐beam (EB) radiation, formed separate crystalline lattices with a homogeneous amorphous phase. The crystallinity of the EB‐exposed samples slightly decreased, as verified by a slight reduction in t…
An ab initio-based kinetic Monte Carlo algorithm was developed to simulate the direct decomposition of NO over Pt and different PtAu alloy surfaces. The algorithm was used to test the influence of the composition and the specific atomic surface structure of the alloy on the simulated activity and selectivity to form N…
We present Raman spectra and Raman images of the methylene blue molecule adsorbed as a single layer on gold nanoparticles regularly arranged in periodic arrays. Spectra and images are recorded in the same spatial and spectral regions using an excitation under total internal reflection. Images of the Raman scattering a…
A series of glucopyranosylamide lipids, N-(X-octadecenoyl)-beta-D-glucopyranosylamine [X = 13-cis (1), 11-cis (2), 9-cis (3), 6-cis (4), and 9-cis,12-cis (5)] and their saturated homologue N-octadecanoyl-beta-d-glucopyranosylamine (6), which differ in the position of a cis double bond in the C18 hydrocarbon chains, ha…
Here, we present experimental data and a theoretical model for the dynamics of detachment of hexadecane drops from a solid substrate (glass plate) in aqueous solutions of anionic surfactant and salt, at various temperatures. The influence of the experimental conditions on the motion of the three-phase contact line is…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTA Chemoselective Approach to Grafting Biodegradable PolyestersIkuo Taniguchi, Anne M. Mayes, Eugene W. L. Chan, and Linda G. GriffithView Author Information Department of Materials Science and Engineering, Massachusetts Institute of…
Chemoselective hydrogenation of halogenated nitrobenzenes over Pt/C catalysts proceeds effectively in supercritical carbon dioxide (scCO2) to produce halogenated anilines with excellent selectivity; the rate of the hydrogenation of nitro groups is markedly enhanced in scCO2 compared to the neat reaction, and the dehal…
From experimental evidence it has been possible to conclude that the strain rate has a great effect on the shape memory alloy load–displacement response. Because in some applications, for example the case for dissipative devices, the strain rate varies over a wide range, it is very important to be able to predict the…
A practical and efficient method to synthesize iptycene quinones has been developed. As a result, a series of pentiptycene quinones 8-16 were conveniently synthesized by one-pot reaction of triptycene quinone 4 or 5 with anthracene 1 or its derivatives 2-3 in refluxing acetic acid in the presence of p-chloranil, follo…
A homologous series of novel chiral dimeric compounds, (R)-2,2′-bis{6-[4-(2-(2-fluoro-4-butyloxyphenyl)pyrimidine-5-yl)phenyloxy]alkyloxy}-1,1′-binaphthyl, has been prepared and the physical properties investigated. The binaphthyl derivatives with an even number of atoms in the spacers showed a chiral nematic phase, h…