Materials Literature
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Monte Carlo simulations have been applied to investigate the behavior of thin polymeric films near the glass transition. Free-standing films of both linear and cyclic polymeric chains have been considered in this work. In agreement with experiments, we find that the apparent glass transition temperature of free-standi…
In this contribution we present a continuous wave (CW), pulse electron paramagnetic resonance (EPR), and pulse electron nuclear double resonance (ENDOR) study of (OEC)Co(C 6 H 5 ), where OEC is the trianion of 2,3,7,8,12,13,17,18-octaethylcorrole. To facilitate spectral assignments isotopic substitutions were employed…
High-resolution transmission electron microscopy and spatially resolved electron loss spectroscopy have revealed that a eutectic mixture of AgCl and AgI crystallizes within single walled carbon nanotubes (SWNTs) as metastable AgCl(1-)(x)I(x) 1D solid solution crystals. The incorporated halide crystals form wurzite "tu…
Polytetrahydrofuran (PTHF)/poly(1,3-dioxepane) (PDOP)/polystyrene (PSt) ABC miktoarm star copolymers were synthesized by combination of cationic ring-opening polymerization (CROP) and atom transfer radical polymerization. Two different functional groups, carboxylic acid and CHBr, were capped at one end of PTHF through…
Metal ion sorption can be significantly impacted by the presence of other solutes or complexing species. In this research, macroscopic sorption studies were conducted to evaluate the effect of strongly sorbing Se(IV) and weakly sorbing Se(VI) oxyanions on cobalt(II) sorption to gamma-Al2O3. Se(IV) was found to signifi…
The structure and structural transition of silk fibroin from a wild silkworm Antheraea pernyi ( A. pernyi ), whose amino acid sequence consists of poly( l -alanine) (PLA) and a Gly-rich region, were studied with solid-state 13 C cross-polarization magic angle spinning (CP/MAS) NMR. As such, there has been limited info…
We have performed a lattice dynamics calculation to compute the "inherent structures" of minimum potential energy for pentacene, starting from available X-ray data. The calculation shows that two distinct bulk crystalline phases of pentacene exist, with very subtle structural differences but clearly different phonon s…
A new synthetic method to give wholly alicyclic polyimides with high molecular weights has been developed. The polymerization of cyclobutanetetracarboxylic dianhydride ( 1a ) or bicyclo[2.2.1]heptane-2-methanecarboxylic-3,5,6-tricarboxylic-2,3:5,6-dianhydride ( 1b ) with various N-silylated alicyclic diamines ( 2 ) wa…
In this paper, two novel methods of preparing CdS nanoparticles within the corona of block copolymer micelles are presented. (1) Corona-embedded CdS nanoparticles were prepared by dropping core-embedded CdS nanoparticles into water with a low pH value. The location change of the CdS nanoparticles was accompanied by a…
The adsorption of CO on a reduced 1% Ir/Al 2 O 3 catalyst has been studied by using Fourier transform infrared spectroscopy (FTIR) at two constant CO partial pressures P a (200 and 2000 Pa) in the adsorption temperature (denoted by T a ) range of 300−740 K. At 300 K, it is observed a strong IR band at 2044 cm -1 ascri…
Hybrid block copolymers amylose-block-polystyrene were synthesized by covalent attachment of maltoheptaose derivatives to end-functionalized polystyrene and subsequent enzymatic grafting from polymerization. The maltoheptaose derivatives were attached by reductive amination or hydrosilation to amino- or SiH-terminated…
Ordered ferromagnetic−nonmagnetic alloy (Co−Cu, Co−Ag and Fe−Ag) nanowire arrays embedded in the nanochannels of anodic aluminum membranes (AAM) have been fabricated by electrodeposition. Scanning electron microscopy and transmission electron microscopy observations reveal that these alloy nanowires are uniform in dia…
It is crucial in metal particle catalysis to know the true number of catalytically active surface sites; without this knowledge it is impossible (i) to know the true turnover frequency (TOF, i.e., the moles of product/(moles of active metal atoms x time)); (ii) to know for certain whether a (quantitatively) better cat…
The thermal spin transition between a high-spin state ( S = 5/2) and an intermediate-spin state ( S = 3/2) of the octhahedrally coordinated Mn(II)(3d 5 ) was observed in Rb(I)Mn(II)[Fe(III)(CN) 6 ] with a very wide hysteresis loop over the temperature range of 231 to 304 K. This phenomenon is accompanied by a structur…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTThe First High Molecular Weight Poly(N-alkyl-3,6-carbazole)sZhong-Biao Zhang, Michiya Fujiki, Hong-Zhi Tang, Masao Motonaga, and Keiichi TorimitsuView Author Information NTT Basic Research Laboratories, NTT Corporation, and CREST-JS…
The formation of mesoporous silica materials has been studied using blends of diblock (C n H 2 n +1 (OCH 2 CH 2 ) x OH, C n EO x, n = 12 − 18 and x = 2−100) and Pluronic triblock (EO x PO 70 EO x, x = 5−100) amphiphilic block copolymers as the structure-directing agents and sodium silicate as the silica source. The me…
Silver and gold nanocrystals, sterically stabilized with dodecanethiol ligands, were dispersed in supercritical ethane. Nanocrystal dispersibility was measured as a function of solvent density with pressures and temperatures ranging from 138 to 414 bar and 25 °C to 65 °C, respectively using UV/visible absorbance spect…
Deposition of CuI on dyed nanoporous TiO2 films from a solution containing a crystal growth inhibitor enables filling of the pores. This technique improves the performance of dye-sensitized solid-state cells based on CuI.
In this work, we demonstrate experimentally that the classification of “inorganic fullerene-like structures” can be extended from transition metal sulfides to include metal oxides. Single-crystalline TiO 2 nanotubes have been synthesized for the first time with an unconstrained solution growth method by hydrolyzing Ti…
Large-quantity growth of hexagonal prismatic ZnO whiskers was achieved via a process of first reduction and following oxidation of a ZnS powder at 1300 °C. The products were characterized using X-ray powder diffraction, scanning electron microscopy, transmission electron microscopy, and photoluminescence spectroscopy.…