Materials Literature
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The functionality of conjugated polymer systems often relies on oxidations or reductions, in most cases mediated by the presence of counterions. The effect that the common counterion hexafluorophosphate (PF6-) has on the intermolecular interactions between charged oligothiophenes is investigated here using ab initio q…
It is shown that a useful relativistic generalization of the conventional spin density for the case of moving electrons is the expectation value of the four-component Bargmann-Wigner polarization operator. An exact equation of motion for this quantity is derived, using the one-particle Dirac equation, and the relativi…
To develop NaYF(4) as bulk luminescence material, transparent glass ceramics containing Er(3+): NaYF(4) nanocrystals were fabricated for the first time, and the influences of heat-treatment temperature and Er(3+) doping level on their upconversion luminescence were investigated. With increasing heating temperature, th…
Abstract Cellulose was dissolved rapidly in 4.6 wt % LiOH/15 wt % urea aqueous solution and precooled to –10 °C to create a colorless transparent solution. 13 C‐NMR spectrum proved that it is a direct solvent for cellulose rather than a derivative aqueous solution system. The result from transmission electron microsco…
Abstract This article presents the results of a study of the processing and physicomechanical properties of environmentally friendly wood‐fiber‐reinforced poly(lactic acid) composites that were produced with a microcompounding molding system. Wood‐fiber‐reinforced polypropylene composites were also processed under sim…
Recently, several groups (Anderson, Halas, Zharov, and their co-workers, 2003; El-Sayed and co-workers, 2006) demonstrated, through pioneering results, the great potential of photothermal (PT) therapy for the selective treatment of cancer cells, bacteria, viruses, and DNA targeted with gold nanospheres, nanoshells, na…
Polyimide/silica hybrids were prepared by a sol-gel process and were evaluated in terms of curing behavior, morphology, water sorption properties and mechanical performances at ambient and at higher temperatures. The spectroscopic examination showed that the presence of the inorganic phase catalyzes the imidization re…
The elastic properties and electronic structure of B2 phase binary TiM (M = Fe, Co, Ni, Pd, Pt and Au) and ternary Ti50Ni43.75Pd6.25, Ti50Ni43.75Cu6.25 shape memory alloys are studied by the plane-wave psedudopotential method within the local density approximation. The elastic constants and density of states are calcu…
Abstract Summary: The phenomenon of crazing in polymers has received considerable attention in the past as it is thought to play a pivotal role in determining the performance of polymers under load. One aspect of particular interest has been the interconnection between molecular structure, craze characteristics, and m…
The cationic polymerization of 2-hydroxymethyltetrahydrofuran proceeds with the elimination of water. This has been clearly observed with matrix-assisted laser desorption/ionization time-of-flight spectroscopy. In the spectra, a series of signals appears for each oligomer with molecular weights corresponding to the fo…
A second-generation [G-2] terminally azido functionalized dendritic ester has been synthesized from a commercially available dendritic polyol BOLTORN® H20. Structural features were confirmed by IR, 1H NMR, and elemental analysis. The differential scanning calorimetry (DSC) analysis shows an acceptable thermal stabilit…
We report on transparent Ni 2+ -doped MgO–Al 2 O 3 –SiO 2 glass ceramics with broadband infrared luminescence. Ni 2+ -doped MgO–Al 2 O 3 –SiO 2 glass is prepared by using the conventional method. After heat treatment at high temperature, MgAl 2 O 4 crystallites are precipitated, and their average size is about 4.3 nm.…
Abstract Two new phenyl‐ and naphthyl‐substituted rigid‐rod aromatic dicarboxylic acid monomers, 2,2′‐diphenylbiphenyl‐4,4′‐dicarboxylic acid ( 4 ) and 2,2′‐di(1‐naphthyl)biphenyl‐4,4′‐dicarboxylic acid ( 5 ), were synthesized by the Suzuki coupling reaction of 2,2′‐diiodobiphenyl‐4,4′‐dicarboxylic acid dimethyl ester…
Aromatic polyimides having phenyl groups at the 2- and 2′-positions of the diphenyl ether moiety were synthesized from bis(4-amino-2-biphenyl) ether and various tetracarboxylic dianhydrides by the conventional two-step procedure using N-methyl-2-pyrrolidone (NMP) as a solvent [Morikawa et al., Polymer Journal37, 759,…
Abstract The polyaniline/iron nanocomposites with both conducting and magnetic properties have been prepared by cryomilling (high‐energy ball milling under cryogenic temperature), in which the average size of iron grains attains 20 nm. Enhanced coercivity of 206 Oe and decreased conductivity of 0.1 S cm −1 at room tem…
A cellular automaton (CA)-based model for the precise two-dimensional simulation of the dendritic morphology of cast aluminum alloys was developed. Compared with previous CA models, the new model considers the solidification process in more detail, solving the solute and heat conservation equations in the modeling dom…
Acid-catalyzed condensation of a pyrrole bisacrylaldehyde with a tripyrrane, followed by oxidation with ferric chloride, gave a [22]porphyrin-(3.1.1.3). This stretched macrocycle shows a strong diamagnetic ring current by (1)H NMR spectroscopy and gives red-shifted porphyrin-like UV-vis spectra; coordination with pall…
The self-assembly of four symmetrically substituted tri-aryl-benzene derivatives of formula C 24 H 15 X 3, where X = H ( 1 ), Cl ( 2 ), COOMe ( 3 ), and COOH ( 4 ), was studied as a function of the substituent X. Crystal packing analysis of compounds 1 − 3 showed that in 1, there are no strong face-to-face stacking in…
Stable organosols of silver nanoparticles (AgNPs) without any capping agents have been synthesized by an electrochemical dissolution of a sacrificing silver electrode in dimethyl sulfoxide (DMSO). The peak at 425 +/- 5 nm observed in the UV-vis spectra was attributed to the surface plasmon resonance for silver. The fo…
Abstract A novel approach to fabricate polymer brushes on the surface of carbon nanotubes (CNTs) is proposed. Carboxyl groups on the surface of chemically oxidized CNTs were reacted with hexamethylene diisocyanate, followed by a reaction with methacrylamide to give terminal vinyl groups‐functionalized CNTs, so called…