Materials Literature
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The paramagnetic 1:1 coordination complexes of (C5Me5)2Yb with a series of 4,4'-disubstituted bipyridines, bipy-X, where X is Me, tert-Bu, OMe, Ph, CO2Me, and CO2Et have been prepared. All of the complexes are paramagnetic and the values of the magnetic susceptibility as a function of temperature show that these value…
Block copolymer ordering in thin films on a preferentially wetting flat substrate is studied using a polystyrene- b -poly(methyl methacrylate) (PS- b -PMMA) diblock copolymer, which forms PMMA cylinders in bulk. Tapping-mode AFM and cross-sectional TEM were employed to characterize the thin film ordered structure of t…
We apply a Monte Carlo polymerization model for Gay-Berne [J. Chem. Phys. 74, 3316 (1981)] monomers that we have recently introduced [J. Chem. Phys. 121, 9123 (2004)] to investigate with computer simulations the effects of nanoconfinement and anchoring type on the structure of the main-chain liquid-crystal polymers fo…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTThermotropic Polypeptides Bearing Side-On MesogensKathleen E. Schaefer, Patrick Keller, and Timothy J. DemingView Author Information Materials Department, University of California, Santa Barbara, Santa Barbara, California 93106; Lab…
The acid-base, spectroscopic, photophysical and liposome-binding properties of the recently synthesized free base, 29H,31H,1,4,8,11,15,18,22,25-octafluoro-2,3,9,10,16,17,23, 24-octakisperfluoro(isopropyl) phthalocyanine, F64PcH2, are reported. The perfluoroalkylation of the phthalocyanine core renders the hydrogen ato…
The influence of hydrothermal treatment on the crystallinity and discharge capability of Al-substituted α-Ni(OH) 2 was discussed in this paper. α-Ni(OH) 2 with 15% Al substitution prepared at room temperature was converted to a mixture of β-Ni(OH) 2 and α-Ni(OH) 2 after treatment in alkaline solution at 140 °C for 1.0…
Electron energy loss near-edge structures (ELNES) and first-principles band structure calculations were combined in order to identify native defects which are segregated by heat treatments at the vicinity of SrTiO3 grain boundary (GB). Spectral differences between the bulk and the vicinity of GB mainly appear around t…
Abstract The effect of the air/oxygen/helium atmospheric plasma treatment on desizing polyvinyl alcohol (PVA) on cotton fabric was discussed as compared with the conventional H2O2 desizing. The possible change mechanism of PVA during atmospheric plasma exposure was induced through a combination of weight loss of PVA a…
We present a surfactant-assisted solvothermal approach for the controllable synthesis of a PbS nanocrystal at low temperature (85 degrees C). Nanotubes (400 nm in length with an outer diameter of 30 nm), bundle-like long nanorods (about 5-15 mum long and an average diameter of 100 nm), nanowires (5-20 mum in length an…
Abstract 3,3′,4,4′‐Diphenylthioether dianhydride (4,4′‐TDPA), 2,3,3′,4′‐diphenylthioether dianhydride (3,4′‐TDPA), and 2,2′,3,3′‐diphenylthioether dianhydride (3,3′‐TDPA) were synthesized from 3‐chlorophthalic anhydride and 4‐chlorophthalic anhydride. A series of polyimides derived from the isomeric diphenylthioether…
The self-assembly of hybrid CdTe/poly(N-isopropylacrylamide-acrylic acid) [poly(NIPAM-AAc)] microgels was tunable in response to pH stimuli. The pH-dependent swelling behavior of the polymer microgels played an important role in the self-assembly processes. At pH 3.73, the fractal and dendritic patterns of CdTe/poly(N…
Abstract Under soft conditions, it is possible to cause the irreversible delamination of organoclays (long‐chain alkylammonium cation‐exchanged smectites, and vermiculite‐layered silicate derivatives) via a sol–gel process that involves alkoxysilanes (e.g., tetraethoxysilane) and that finally gives silica–clay heterom…
Iron and magnesium are almost immiscible at ambient pressure. The low solubility of Mg in Fe is due to a very large size mismatch between the alloy components. However, the compressibility of Mg is much higher than that of Fe, and therefore the difference in atomic sizes between elements decreases dramatically with pr…
A new form of Au3Cu1 hollow nanostructure was prepared by the reaction of Cu nanoparticles with HAuCl4. Following a course of aging, the biomineral botallackite Cu2(OH)3Cl nanoflowers were developed with the aid of Au3Cu1 hollow nanostructures at room temperature. It was proposed that the hollow nanospheres could serv…
Dumbbell-like homogeneous MnO nanocrystals are obtained for the first time via the pyrolysis of manganese formate in trioctylamine/oleic acid media and the orientation aggregation mechanism is proposed for this 1D growth route.
Because of the limitation that many semicrystalline polymers are not transparent, one cannot always study the network stress by optical methods. We suggest to use another tool in such a case. By measuring the azimuthal intensity distribution of the amorphous halo with wide-angle X-ray scattering experiments, one can d…
Abstract The long‐term hydration of white portland cement has been followed through micro‐Raman spectroscopy, choosing for excitation the most adequate laser wavelength as deduced from a critical analysis of the previously reported Raman data. The bands of the corresponding spectra were attributed to the various anhyd…
We present a simple, noncovalent method for anchoring CdSe quantum dots (QDs) onto individual single-walled carbon nanotubes (SWNTs) through a ligand-exchange approach. Trioctylphosphine oxide (TOPO)-capped CdSe quantum dots were prepared, and the cap was then exchanged for pyridine (Py). It was found that the pyridin…
Abstract Basic thermodynamic considerations are used to rationalize the formation of thermotropic mesophases incorporating aromatic ligands for trivalent lanthanide metal ions (Ln). Standard flat and bent molecular interfaces, separating the central binding unit from the lateral, flexible alkoxy chains, provide progra…
The rate of electron tunneling in molecular donor-bridge-acceptor (D-B-A) systems is determined both by the tunneling barrier width and height, that is, both by the distance between the donor and acceptor as well as by the energy gap between the donor and bridge moieties. These factors are therefore important to contr…