Materials Literature
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The synergistic effect due to the application of ultrasound on the photocatalytic degradation of phenol and chlorophenols was demonstrated in the presence of Hombikat TiO 2 suspensions in our sonophotocatalytic reactor. A noticeable enhancement of the reaction rate was found when ultrasound was combined with the photo…
Aging of solutions of chitosan varying in degree of acetylation (DA) and degree of dissociation (alpha) was studied using two techniques. The first concerned potentiometric experiments performed during 3 days on solutions having the same concentration of amino groups (5.2% < DA < 70.6% and 0 < alpha < 1.1). The presen…
Intermolecular carbon nanotube junctions were formed through amide linkage of amino functionalized multiwall carbon nanotubes and [Ru (dcbpy)(bpy)2](PF6)2, an inorganic metal complex. Nanotube interconnects were visualized using atomic force microscopy. Absorption and emission spectroscopy showed significant changes b…
Uniform and small-diameter single-walled carbon nanotubes (SWNTs) have been produced using identical molecular nanoclusters containing Fe and Mo atoms with a defined molecular formula and a specific structure as catalysts in a chemical vapor deposition method. The average diameter of the SWNTs produced in these experi…
Heterocyclic unit 2 containing complementary donor-donor-acceptor (DDA) and acceptor-acceptor-donor (AAD) hydrogen bonding arrays at an angle of about 60 degrees was designed to self-assemble into a hexamer. To investigate whether this unit could self-assemble dendrimers, the 2,8-diamino-2-N-ethylpyrimido-(4,5-b)(1,8)…
Porous alumina membranes are commercially available and have been widely used in recent nanoscale research, for example, as templates in nanowire fabrication through electrodeposition. In this report, we present a new use for porous alumina membranes in the fabrication of alumina nanotubes/nanowires desired in electro…
In-situ rheo-SAXS (small-angle X-ray scattering) and rheo-WAXD (wide-angle X-ray diffraction) studies were carried out to investigate the nature of shear-induced precursor structures in isotactic polypropylene (iPP) melt at 165 °C, near its nominal melting point. Immediately upon the cessation of shear, SAXS patterns…
In this study, we fabricated new spherical silica templates with submicrometer sized solid cores containing an encapsulated Au nanoparticle surrounded by a mesoporous shell structure. Hollow spherical carbon and polymer capsules, containing gold nanoparticles, were synthesized using these silica templates. The resulti…
Chemical vapor deposition (CVD) is the most promising synthesis route for economically producing large quantities of carbon nanotubes. We have developed a low-cost CVD process for the continuous production of aligned multiwall carbon nanotubes (MWNTs). Here we report the effects of reactor temperature, reaction time,…
X-ray powder diffraction experiments were performed at pressures up to 14 GPa and at room temperature. The orthorhombic lattice was retained at pressures up to 10 GPa. Above 10 GPa, however, a broad glassy background developed. The lattice constants, a , b , c , and the orientation angle at 2.72 GPa are 5.845, 5.220,…
The pressure dependence of the Curie temperatures of the Fe 2 P-type intermetallic compounds MnRhP, MnRhAs and MnRhAs 0.6 P 0.4 was investigated up to 8 GPa. For MnRhAs both the Curie temperature T C and the temperature T t of the transition from AF I to the canted state increased with pressure. However, T t decreased…
The catalytic effects of copper-based alloys in diamond growth have been investigated. A single crystal of diamond has been obtained by the temperature gradient method (TGM), using Cu–Mn–Co and Cu–Co alloys as catalysts. It was found that the melted Cu–Mn–Co and Cu–Co alloys show low viscosity. The eutectic temperatur…
The paper develops a one-dimensional magneto-elastic model of a magnetostrictive fiber actuated polymer matrix composite material which accounts for a strong viscoelastic response in the polymer matrix. The viscoelastic behavior of the composite polymer matrix is modeled with a three parallel Maxwell element viscoelas…
Abstract An exact matrix polynomial series solution for oblique propagation in a cholesteric liquid crystal, reported in this journal some years ago, was numerically implemented. After a slight reformulation, it was found that numerical results can be accurately and quickly obtained with a simple desktop computer. Wit…
Raman results for different single-walled carbon nanotube bundles doped with Br 2 were studied both at ambient pressure and under high pressure up to 6 GPa. Our study indicates that bromine resides in the interstitial channel of nanotube bundles as a form of polymer.
It is well known that, when a stationary vapor bubble is subject to a sufficiently intense acoustic field, it will grow by rectified heat transfer even in a subcooled liquid. The object of this paper is to study how translation, and the ensuing convective effects, influence this process. It is shown that, depending on…
Decaborane, a molecular boron hydride, was compressed to 131 GPa at room temperature to explore possible non-molecular phases in this system and their physical properties. Decaborane changed its colour from transparent yellow to orange/red above 50 GPa and then to black above 100 GPa, suggesting some transformations.…
In this paper we report a theoretical study of the static dipole polarizability of two one-dimensional structures: (a) linear carbon chains ${\mathrm{C}}_{n}$ $(n=2\ensuremath{-}10)$ and (b) ladderlike planar boron chains ${\mathrm{B}}_{n}$ $(n=4\ensuremath{-}14).$ The polarizabilities of these chains are calculated b…
Despite great technological importance and many investigations, a material with a measured hardness comparable to that of diamond or cubic boron nitride has yet to be identified. Our combined theoretical and experimental investigations led to the discovery of a new polymorph of titanium dioxide, where titanium is nine…
In this paper, we report a theoretical study of the hydrogen abstraction reactions from ethylbenzene by a series of imide-N-oxyl radicals. Geometry optimizations and vibrational frequencies were performed using density functional theory at the B3LYP/6-31G(d,p) level. Single-point energy calculations were carried out a…