Materials Literature
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The mechanism for the formation of NH 3 during the NO−H 2 reaction over Pt/ZrO 2 was studied. Steady-state isotopic transient kinetic analysis was carried out with isotopic switching from 15 NO−D 2 to 14 NO−D 2, and the results revealed that formation of N 2 and N 2 O was associated with linearly adsorbed NO on the Pt…
The degree of the transformation of MoO3 films (d= 8–130 nm) increased as the duration (1–140 min) and temperature (373–573 K) of thermal treatment grew and as the film thickness decreased under atmospheric conditions. The thermal treatment of MoO3 films decreased the optical density at λ = 350 nm and caused the appea…
We applied the zone heating method to cylinder-forming diblock copolymers (bcp) for controlling the orientation of the hexagonally packed cylindrical microdomain structures (hex-cyl) and reported the results of the structure analysis by small-angle X-ray scattering (SAXS) in our previous paper [Mita et al. Macromolecu…
Abstract A new combination of ionically conducting polymer–clay nanocomposites based on (PAN) 8 LiClO 4 + x wt % montmorillonite (unmodified) clay has been prepared using the standard solution cast process. X‐Ray diffraction (XRD) analysis reveals strong interaction of polymer salt complex (PS) with the montmorillonit…
Abstract A novel amorphous polyamide/montmorillonite nanocomposite based on poly(hexamethylene isophthalamide) was successfully prepared by melt intercalation. Wide angle X‐ray diffraction and transmission electron microscopy showed that organoclay containing quaternary amine surfactants with phenyl and hydroxyl group…
We report the observation of ferroelectricity in a copper octacyanomolybdate-based paramagnet, Cu(2)[Mo(CN)(8)].8H(2)O (Cu(II), S = (1)/(2); Mo(IV), S = 0). This compound has a freezing point for the fixation of hydrogen bonding at 150 K. Around this temperature, an enhancement in the ferroelectricity and an increase…
A highly asymmetric Ni(II) cluster [Ni(4)(OH)(OMe)(3)(Hphpz)(4)(MeOH)(3)](MeOH) (1) (H(2)phpz=3-methyl-5-(2-hydroxyphenyl)pyrazole) has been prepared and its structure determined by means of single-crystal X-ray diffraction by using synchrotron radiation. Variable-temperature bulk-magnetization measurements show that…
Methods based on density functional theory calculations have been used to simulate the absorption spectra of a streptocyanine and of its covalently bonded dimer. Two approaches, based on multimode Franck-Condon overlap integrals, have been employed. In the first approach the monomer and the dimer are treated as single…
BACKGROUND: We present a novel feature selection algorithm, Winnowing Artificial Ant Colony (WAAC), that performs simultaneous feature selection and model parameter optimisation for the development of predictive quantitative structure-property relationship (QSPR) models. The WAAC algorithm is an extension of the modif…
Abstract In this study, different modified polyethylenes with different molar masses and different modification rates were examined as compatibilizers to prepare high density polyethylene/organoclay nanocomposites. Nanocomposites having 5 wt % organo‐modified clay and 20 wt % interfacial agent were prepared by melt bl…
Is ZnTe it great: Controlling the crystal-growth direction leads to formation of single-crystal ZnTe nanobelts along the 〈00〉 direction. The nanobelts, which were synthesized in oleylamine at 250 °C, have a narrow thickness (<6 nm). The ZnTe nanobelts behave as p-type semiconductors in field-effect transistors (see pi…
The lifetimes of optical phonons (OPs) in single-walled carbon nanotubes are determined by time-resolved incoherent anti-Stokes Raman scattering using a subpicosecond pump-probe method. Lifetimes in semiconducting and metallic nanotubes at room temperature are similar, 1.2 and 0.9 ps, respectively. The OP lifetimes de…
Here we report on the synthesis of CdSe quantum dots from a noncoordinating solvent. We show that nucleation and growth is very fast and is completed within 100 s. The subsequent increase in average particle size is due to diffusion limited coarsening. Growth and coarsening can be quenched by injection of dodecanethio…
Thorough analyses of X-ray diffraction patterns of syndiotactic polystyrene (s-PS) films, exhibiting different crystalline and co-crystalline phases, and related evaluations of degrees of orientation have allowed to give a more accurate as well as simpler description of the three known uniplanar orientations. This new…
The electronic structures of chromium and vanadium centers coordinated by three reduced 1,2-diketones have been elucidated by using density functional theory (DFT) calculations and a host of physical methods: X-ray crystallography; cyclic voltammetry; ultraviolet-visible (UV-vis), nuclear magnetic resonance (NMR), and…
Application of pressure or electron doping through Co substitution into Fe sites transforms the itinerant antiferromagnet BaFe 2 As 2 into a superconductor with T c exceeding 20 K. We carried out systematic transport measurements of BaFe 2− x Co x As 2 superconductors in pressures up to 2.5 GPa, and elucidated the int…
A variety of calcium carbonate (CaCO 3 ) biominerals are now thought to be formed via an amorphous precursor pathway. Our group has been using in vitro model systems to examine potential crystallochemical reactions that might occur during biomineralization and, in particular, has proposed that a polymer-induced liquid…
Cationic ring-opening polymerization of oxygen-containing heterocycles may proceed either by active chain end (ACE) mechanism or by activated monomer (AM) mechanism for which the presence of terminal HO group is required. Typically, ACE mechanism is favored. Cationic polymerization of L,L-lactide seems to be an excep…
We propose a model for the Fe atomic displacements in the low-temperature phase of magnetite $({\text{Fe}}_{3}{\text{O}}_{4})$, based on the analysis of the photon energy dependence of the scattered intensity of selected reflections in a resonant x-ray scattering experiment. The symmetry of the displacement pattern is…
A dithiocarbamate-based methodology is employed to prepare linked heteromultimetallic complexes and then further exploited in the surface functionalisation of gold nanoparticles.