Materials Literature
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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…
Abstract Summary: In order to achieve a reasonable response time in an electrochromic display, viologen‐modified porous polymeric microspheres of various porosities have been used as substrates. Porous microspheres are prepared using seeded polymerization in the presence of a porogen. Based on ionic conductivity and t…
Abstract Amphiphilic copolymer networks were prepared from hyperbranched fluoropolymer (HBFP*, M n = 38 kDa, by atom transfer radical‐self condensing vinyl copolymerization) and linear diamine‐terminated poly(ethylene glycol) (DA‐PEG, M n = 1,630 Da). Model studies found that the crosslinking mechanism occurred at amb…
The positive temperature coefficient of resistivity (PTCR) of in situ microfibrillar carbon black∕poly (ethylene terephthalate)∕polyethylene composite attenuates dramatically after a sufficient time of isothermal treatment without oxygen above the melting region of polyethylene. The inhomogeneous surface microstructur…
We have studied the phase diagram of LaVOx films grown on (001) SrTiO3 substrates by pulsed laser deposition. With increasing oxygen partial pressure, the growth phase diagram varies between epitaxial perovskite LaV3+O3 single crystal films and polycrystalline monoclinic LaV5+O4. An interesting feature is the lack of…
Abstract Summary: Dissipative particle dynamics simulation was performed to study the formation of multicompartment micelles from ABC star triblock copolymers in water. The study revealed some new morphologies that had not been observed before and also provided a direct visualization of the evolution of wormlike multi…
A Ba0.3Sr0.7TiO3 (BST) thin film composite structure was fabricated by means of a selective epitaxial growth process. The epitaxial growth of BST on SrRuO3 electrode surface was selectively achieved at 485°C using a prepatterned ultrathin amorphous BST layer that locally prevented crystallization. This self-buildup me…
A matter of attraction: A magnet of nominal VII(TCNB−)1.5(TCNB0)x−1.5[V−I(CO)v]0.5⋅z solvent composition (Tc=325 K) is synthesized and its magnetic properties examined. Its amorphous nature makes it difficult to determine its complex composition and structure. It is a soft ferrimagnet with a coercive field of 7 Oe. Th…