Materials Literature
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Abstract Suspension polymerization in an aqueous medium was applied to the syntheses of styrenic‐based polymerized toner particles. Poly(vinyl alcohol) and benzoyl peroxide were used as a dispersant and an initiator, respectively. The resulting polymerized toners were found to be smooth on their spherical surfaces, an…
Mn(hfac)(2) complexes of [2-(5-pyrimidinyl)-4,4,5,5-tetramethyl-4,5-dihydro-1H- imidazoline-1-oxyl 3-oxide] (1) and its 2-(3-pyridyl) analogue (2) were prepared. Both complexes formed similar dimer structures. However, their packing patterns were considerably different. The pyrimidine dimers were aligned to form a lin…
Abstract Crosslinked amphoteric starches (CASs) with quaternary ammonium cationic and carboxymethyl anionic groups were prepared by a hemidry reaction. Their adsorption behavior for Cr(VI) was investigated, and was found to follow the Langmuir isotherm. The adsorption process was found to be dependent on initial pH, c…
Abstract The solid‐state polymerization (SSP) reaction kinetics of poly(ethylene terephthalate) were investigated in connection with the initial precursor intrinsic viscosity (IV; molecular weight). Evaluations were performed with otherwise equivalent precursors melt‐polymerized to IVs of 0.50, 0.56, and 0.64 dL/g. Th…
We propose a three-dimensional and high-resolution quantitative image analysis technique for the investigation of the internal microstructure of polymer foams. Microscopy, which is the conventional method of investigation of foams, images only the surface of samples, though, three-dimensional x-ray computed microtomog…
The opening of bud -type single-wall carbon nanohorns (SWNHs) by heat treatment in CO 2 was studied by TEM and nitrogen adsorption (77 K). The adsorption isotherms indicate that oxidation by CO 2 at 1273 K provides a sufficient nanohorn opening. The pore structure parameters of the open nanohorns can be controlled by…
Reversible valence tautomeric conversion induced by a single-shot laser pulse (8 ns duration) with a photon excitation energy of 2.38 eV has been observed in ${\mathrm{N}\mathrm{a}}_{0.36}{\mathrm{C}\mathrm{o}}_{1.32}\mathrm{F}\mathrm{e}(\mathrm{C}\mathrm{N}{)}_{6}\ifmmode\cdot\else\textperiodcentered\fi{}5.6{\mathrm{…
A self-consistent activity model is presented to calculate the effect of methanol on barite, gypsum, celestite, and halite solubility in methanol/water/salt and ethylene glycol/water/salt solutions. The model parameters are derived from experimental studies at 0−6 m ionic strength, 4−50 °C, and 0−90 wt % of methanol a…
Polymer-layered silicate nanocomposites are new hybrid polymeric materials with nanometre thick layered silicates that generally show improvement over the properties of polymeric materials. This paper reports that synthesized organolayered silicates can be used to make epoxy nanocomposites. The nanocomposites were cha…
We present a model for the process of the growth of carbon nanotubes (CNTs) obtained by chemical vapour deposition in the presence of transition metal nanoparticles (Me-NPs) which act as a catalyst. We have deduced that the growth of a CNT occurs in the presence of two forces: (i) a viscous force, due to the surroundi…
A simple and practical synthesis of soluble hexa-peri-hexabenzocoronene (HBC) from readily available hexaphenylbenzene (HPB) is described. In this simple procedure, the substitution of the free para positions of the propeller-shaped HPB with tert-butyl groups and the oxidative cyclodehydrogenation to planar HBC is ach…
In the near future physical and economic constraints are expected to limit the continued miniaturisation of electronic and optical devices using current "top-down" lithography-based methods. Consequently, nonlithographic methods for synthesising and organising materials on the nanometre scale are required. In response…
Abstract The water absorption of montmorillonite was studied using TGA and FTIR, and a removal method through boiling with toluene was investigated. PU/MMT was synthesized and its morphology, thermal dynamic mechanical properties and tensile behaviour were investigated by WAXD, FTIR, DMTA and Instron techniques. We fi…
We report the phenomenon that the intensity of the ultraviolet (UV) photoluminescence (PL) from ZnO was greatly enhanced by incorporating ZnO into the SiO 2 matrix. PL excitation results show that both the ZnO nanoparticles and the SiO 2 matrix in the nanocomposites contribute to the luminescence process for the UV ba…
Ordered TiO 2 nanowire arrays have been successfully fabricated into the nanochannels of a porous anodic alumina membrane by sol–gel electrophoretic deposition. After annealing at 500°C, the TiO 2 nanowire arrays and the individual nanowires were characterized using scanning electron microscopy (SEM), transmission ele…
High-resolution angle-resolved photoemission data show that a metal-insulator Mott transition occurs at the surface of the quasi-two-dimensional compound 1T-TaSe2. The transition is driven by the narrowing of the Ta 5d band induced by a temperature-dependent modulation of the atomic positions. A dynamical mean-field t…
In a series of heterodinuclear complexes in which a Pt(PPh3)2(catecholate) chromophore is covalently linked to a lanthanide tris(diketonate) unit, sensitised near-IR emission from Yb(III), Nd(III) and Er(III) occurs on excitation of the Pt(II) chromophore at 520 nm.
The use of a combination of tunneling and optical spectroscopy to investigate the size and shape-dependent level structure and single-electron charging phenomena in semiconductor nanocrystals is reviewed. The artificial atom character of semiconductor nanocrystal quantum dots is manifested in both the discrete level s…
Hydrogen is a ubiquitous impurity in diamond but in contrast to other group IV materials the microscopic structure adopted in bulk material has largely remained elusive. It has therefore been the role of modelling to predict the properties of H in bulk diamond, as well as the interactions with impurities and other def…
The magnetic properties of $R{\mathrm{Te}}_{3}$ $(R=\mathrm{Ce},$ Pr, Nd, Gd, Dy), which has a structure consisting of the alternate stacking of one $R\mathrm{Te}$ layer and two Te layers, were investigated using magnetization and electrical resistivity measurements. The magnetic transition temperatures were found at…