Materials Literature
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Quantum mechanical (QM) and QM/molecular mechanics (MM) studies of the full catalytic cycle of N(2)O reduction by CO in Fe-BEA zeolite, that is, oxidation of BEA-Fe by N(2)O and reduction of BEA-Fe-alphaO by CO, is presented. A large QM cluster, representing half of the channel of the BEA zeolite, is used. The contrib…
Water soluble CdTe nanocrystals (NCs) of two different sizes capped by thioglycolic acid were synthesized and were dispersed in pure water. We have observed that the emission color of CdTe NCs has been changed in a single droplet of water during the evaporation of the solvent. This is attributed to Förster resonance e…
We developed a composite system to produce robust bistable smectic-A (SmA) liquid crystal based flexible displays by encapsulating the liquid crystal material in a polymer wall structure. While keeping all the intrinsic bistable properties of the SmA material, the field-induced polymer walls bridge the two display sub…
In the nanocomposite of multiwalled carbon nanotubes (MWNTs) and RuO2 for supercapacitor electrode materials, upon immersion of the purified MWNT into a RuCl3 solution, Ru metal having no contribution to pseudocapacitance was unexpectedly formed on the MWNT surface by spontaneous reduction, because of the higher Fermi…
<div class="htmlview paragraph">Popular depictions of space exploration as well as government life support research programs have long assumed that future planetary bases would rely on small scale, closed ecological systems with crop plants producing food, water, and oxygen and with bioreactors recycling waste.…
Photoinduced fluorescence enhancement (PFE) of CdSe∕ZnS core/shell quantum dot (QD) films on SiOx substrates was investigated. The fluorescence intensity of the QD film on SiO1.9 was greatly enhanced by continuous irradiation in vacuum, while the same QD film on SiO0.6 showed a small enhancement of the fluorescence in…
Abstract The production of O 2 ‐enriched air (OEA) using dense mixed conducting perovskite hollow fiber membranes was studied experimentally and theoretically. The fibers were prepared by phase inversion spinning followed by sintering. A mathematical model was developed based on the mass balances for the OEA side, the…
Samarium doped bismuth titanate thin films with the composition of Bi3.25Sm0.75Ti3O12 and with strong preferred orientations along the c axis and the (117) direction were fabricated on Pt∕TiO2∕SiO2∕Si substrate by pulsed laser ablation. Measurements on Pt∕BSmT∕Pt capacitors showed that the c-axis oriented film had a s…
Periodic arrays of magnetic structures with micrometrer and submicrometer lateral sizes have been prepared at the surface of an austenitic stainless steel by means of local deformation using a nanoindenter. This method takes advantage of the phase transformation (from nonmagnetic fcc austenite to ferromagnetic bct mar…
We present a combined experimental and Monte Carlo study of a nematic phase in the presence of quenched disorder. The turbidity of a nematic liquid crystal embedded in a porous polymer membrane is measured under different applied field conditions for field-cooled and zero-field-cooled samples. We find that a significa…
Despite the observation by a number of groups of a strong luminescence sensitization effect of erbium ions by excitation exchange from silicon nanoclusters, there is considerable experimental evidence that the fraction of Er ions excited by Si-nc is actually very low for much of the material reported. In this work, we…
Abstract Libraries of 3‐aminopropyl‐terminated poly(dimethylsiloxane) (APT–PDMS) and poly(ϵ‐caprolactone)–poly(dimethylsiloxane)–poly(ϵ‐caprolactone) (PCL—PDMS–PCL) triblock copolymers were synthesized. Preliminary experiments were carried out to select an appropriate catalyst and route for the poly(dimethylsiloxane)…
The optical and magnetic stability of hydrothermally grown Co-doped ZnO nanowires were investigated. The experimental results suggest that two different kinds of coordination of Co ions in the ZnO host, either with or without magnetic coupling, likely coexist in the as-grown samples. Low-temperature annealing resulted…
Abstract Summary: An inorganic hybrid material was produced using a polysiloxane binder and metal‐oxo‐clusters which were derived from sol‐gel precursors. The continuous phase is composed of an elastomeric polysiloxane functionalized with cycloaliphatic epoxide groups. Pendant alkoxy silane groups serve as a coupling…
Abstract: A new method combining the split Hopkinson pressure bar (SHPB) technique with the back‐propagation (BP) neural network program is proposed. By this method, the treated strain wave signals become smooth with less noises induced by the transverse inertia. Moreover, the dynamic rate‐dependent constitutive behav…
In As ∕ Zn Se core/shell nanoparticles (NP) were self-assembled on GaAs substrates using different organic molecules of varying length and properties as linkers. The molecules provide control over the coupling and tunneling properties between the substrate and the nanocrystals. By coadsorbing of gold NP on the GaAs su…
The present study reports a clear evidence and physical significance of an inhomogeneous effect of particle size on electrons originating from various electronic levels of copper nitride nanoparticles. X-ray photoelectron and optical absorption spectroscopy studies reveal that a direct modification of the valence band…
Carbon-encapsulated ZnSe nanoparticles with diameters about 50nm were synthesized by noncatalytic one-step thermal evaporation method. The ZnSe cores have a wurtzite crystal structure. The as-synthesized products are uniform and composed of single-crystalline ZnSe nanoparticles enwrapped with polycrystalline graphite…
The kinetic details of the nucleation in a supercooled Ni6Cu4 melt are investigated using molecular dynamics simulation method. It is indicated that the nucleus is a random mixture of a large number of fcc structures and a small number of hcp structures. The growth rate of the nucleus increases linearly with undercool…
On a reduced charge: The reduction of 1,2,4,5-tetracyanobenzene (TCNB) with tetrakis(dimethylamino)ethylene (TDAE) forms [TDAE][TCNB]3⋅MeCN. Characterization reveals that the [TDAE]2+ ion is present, and that TCNB is reduced forming diamagnetic [TCNB]32−. The reduced TCNB units (see picture) are best described as [TCN…