Materials Literature
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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.…
We examined the melt and solid-state structures of a series of diblock copolymers containing polyethylene as the minority block, with a rubbery hydrocarbon majority block. When the interblock segregation strength during crystallization is sufficiently high (approximately 3 times the segregation strength at the order−d…
Intercalated nanocomposites of polypropylene (PP)/clay (PPCNs) were prepared by a melt extrusion process using maleic anhydride modified PP (PP-MA) and organophilic clay. The extent of intercalation of PP-MA chains in the space between silicate galleries increased with crystallization temperature T c and decreased as…
Nearly monodisperse iron nanoclusters have been used to define the diameters of carbon nanotubes grown by chemical vapor deposition (CVD). Iron nanoparticles with average diameters of 3, 9, and 13 nm were used to grow carbon nanotubes with average diameters of 3, 7, and 12 nm, respectively. Transmission electron micro…
As part of understanding the processes leading to sodium release and ion exchange, the surface and near surface reaction regions on several specimens of a Na2O–Al2O3–SiO2 glass have been examined after exposures to isotopically labeled aqueous solutions. The majority of the analyses described here have been carried ou…
We have developed a simulation technique, based on a dynamic mean field theory to describe the evolution of a melt of liquid crystalline polymers that is quenched below its isotropic–nematic transition temperature. The polymers are described by chains characterized by a bending energy depending on the angles between c…
Accuracy of Overlay Metrology with Nonp-enetrating and Negative-Charging Electron Beam of the Scanning Electron Microscope, Koike, Toru, Ikeda, Takahiro, Miyoshi, Motosuke, Okumura, Katsuya, Ura, Katsumi
A novel method of pulsed laser deposition (PLD) was applied to poly(tetrafluoroethylene) (PTFE), poly(methylmethacrylate) (PMMA), and polycarbonate (PC). The basis of the technique is that ablation is brought about by excitation not of polymers themselves but of anthracene doped in the polymer targets. Laser excitatio…
The stacking faults and their effects on ferroelectric properties in strontium–bismuth–tantalate SrBi2Ta2O9 have been studied by transmission electron microscopy (TEM) and ferroelectric hysteresis loop measurement. The structure of SrBi2Ta2O9 consists of Bi2O2 layers and double perovskite type TaO6 octahedral units. T…