Materials Literature
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Abstract The emission intensities of Tb(hexafluoroacetylacetonato)3(H2O)2 [Tb(HFA)3(H2O)2] and Tb(HFA)3(triphenylphosphine oxide)2 [Tb(HFA)3(TPPO)2] in acetone-d6 dramatically decreased with increasing temperature in contrast to no change observed for Tb(NO3)3. The high thermal sensitivity is attributed to the back en…
The spectroscopic properties and the electronic structure of the only nitrous oxide complex existing in isolated form, [Ru(NH(3))(5)(N(2)O)]X(2) (1, X = Br(-), BF(4)(-)), are investigated in detail in comparison to the nitric oxide precursor, [Ru(NH(3))(5)(NO)]X(3) (2). IR and Raman spectra of 1 and of the correspondi…
The conditions for single wall carbon nanotube formation in the arc discharge method of nanotube production are described. Carbon nanotube seed formation and charging in the interelectrode gap are found to be very important effects that may alter carbon nanotube formation on the cathode surface. The model predicts tha…
The expansion of the second-generation reactive empirical bond order (REBO) potential for hydrocarbons, as parametrized by Brenner and co-workers, to include oxygen is presented. This involves the explicit inclusion of C–O, H–O, and O–O interactions to the existing C–C, C–H, and H–H interactions in the REBO potential.…
Measurements on ‘free-standing’ single-crystal barium titanate capacitors with thickness down to 75 nm show a dielectric response typical of large single crystals, rather than conventional thin films. There is a notable absence of any broadening or temperature shift of the dielectric peak or loss tangent. Peak dielect…
We review recent advances made in the phase field modelling of polycrystalline solidification. Areas covered include the development of theory from early approaches that allow for only a few crystal orientations, to the latest models relying on a continuous orientation field and a free energy functional that is invari…
Photovoltaic properties of dye, N -(1-pyrenyl)maleimide (PM), functionalized single-walled carbon nanotubes (SWNT)−conjugated polymer, poly(3-octylthiophene) (P3OT), blend composites are reported. Devices were fabricated by drop or spin cast from the solution of composite onto ITO-coated glass. Improved performance wa…
Magnesium hydroxide nanoparticles with different morphological structures of needle-, lamellar- and rod-like nanocrystals have been synthesized by solution precipitation reactions of alkaline with magnesium chloride in the presence of complex dispersants and characterized in terms of morphology, particle size, crystal…
Abstract. – The interplay between clustering and exchange coupling in magnetic semiconductors for the prototype (Ga1−x,Mnx)As with manganese concentrations x of 1/16 and 1/32 in the interesting experimental range is investigated. For x ∼ 6%, when all possible arrangements of two atoms within a large supercell are cons…
A simple two-step method was developed for the covalent immobilization of atom-transfer radical polymerization (ATRP) initiators on the hydrogen-terminated Si(100) (Si-H) surface. Well-defined functional polymer-Si hybrids, consisting of covalently tethered brushes of poly(ethylene glycol) monomethacrylate (PEGMA) pol…
The self-wetting properties of ionic crystal surfaces are studied, using NaCl(100) as a prototype case. The anomalously large contact angle measured long ago by Mutaftschiev is well reproduced by realistic molecular dynamics simulations. Based on these results, and on independent determinations of the liquid-vapor and…
We report the observation of coherent polarization coupling between the exciton of a molecular J-aggregate and the electronic polarization of noble metal nanoparticles. For Ag nanoparticles, coherent exciton coupling to the conduction band electrons leads to constructive interference and a long-lived exciton. For Au n…
The relationship between perturbations to contact angles on a rough or textured surface and the super-hydrophobic enhancement of the equilibrium contact angle is discussed theoretically. Two models are considered. In the first (Wenzel) case, the super-hydrophobic surface has a very high contact angle and the droplet c…
The mechanisms involved in the crystallization of polymer molecules, in the form of folded chain crystals [1] called lamellae, are now well understood [24]. The lamellar organization of polymers, crystallized both from solution and from the melt, is generally observed when the polymer chains are flexible and linear eno…
We have studied the rheological property evolution and hydration behavior of white and ordinary portland cement (type I) pastes and concentrated cement–polyelectrolyte suspensions. Cement composition had a marked effect on the elastic property evolution ( G ′( t )) and hydration behavior of these suspensions in the pr…
The galvanizing reaction is retarded when phosphorus-added steel is used as a substrate. We have found that both the galvanizing and the galvannealing reactions are highly promoted when thiourea solution is coated on the cold-rolled steel surface before the annealing process. Both a plan-view and cross-sectional chara…
An adjacent sequence iteration method for designing a diffractive element with function of controlling wavefront propagation is presented, and a binary optical element for focusing a diode laser beam in a long focal depth is designed with this method, fabricated by means of photolithography and ion-etching techniques.…
Article Grain boundary self-diffusion in α-iron of different purity: effect of dislocation enhanced diffusion was published on October 1, 2004 in the journal International Journal of Materials Research (volume 95, issue 10).
Abstract The thermal behavior and kinetic parameters of the decomposition reaction of triethylene glycol dinitrate (TEGDN) in a temperature‐programmed mode at different pressures (0.1, 2, 4 and 6 MPa) have been investigated by means of DSC and TG‐DTG. The results show that the properties of the thermal decomposition o…
Emission properties and energy transfer of PbO–Bi 2 O 3 –Ga 2 O 3 –GeO 2 glasses codoped with Tm 3+ and Tb 3+ ions were investigated. The 1.48‐μm emission due to the Tm 3+ : 3 H 4 → 3 F 4 transition can be used to amplify the S‐band (1460–1530‐nm) signal light. With Tb 3+ addition, the lifetime and emission intensity…