Materials Literature
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Platinum (Pt) nanocrystals with special surfaces attract much attention in the field of chemistry because the surface structure plays a vital role for the activity and selectivity of Pt catalyst. The surface evolution of Pt nanocrystals is closely related with facet growth, which depends on not only the oxidizing prop…
Perovskites, with exclusive selectivity for oxygen over nitrogen, offer significant promise as potential high temperature adsorbents for air separation. Results from fixed bed, breakthrough experiments at 500 °C on two perovskite samples having compositions SrCo 0.5 Fe 0.5 O 3- δ and La 0.1 Sr 0.8 Ag 0.1 Co 0.5 Fe 0.5…
Taking into account both curvature and disorder, we study the magnetic moments of carbon nanotori in the presence of magnetic field B (perpendicular to the torus plane). Due to the intrinsic curvature effect, energy gaps of about 10 meV are obtained in those primary metallic carbon nanotori, which result in a novel ma…
A fast electrochemical replication technique has been developed to fabricate large-scale ultra-smooth aluminum foils by exploiting readily available large-scale smooth silicon wafers as the masters. Since the adhesion of aluminum on silicon depends on the time of surface pretreatment in water, it is possible to either…
The interactions of CH 4, CO, and CH 4 /O 2 with Ni/Al 2 O 3 catalysts were examined by the pulse reaction technique and the transient response technique. The adsorption and dissociation of CH 4, CO, CH 4 /CO 2, and CH 4 /O 2 on nickel alumina catalysts were also extensively investigated by temperature-programmed hydr…
Abstract High‐field transport properties of ZnO and ZnO/ZnMgO heterostructures were investigated. Three types of structures, a 500‐nm‐thick ZnO and ZnO/ZnMgO single‐hetero‐ (SH) and single‐quantum‐well (SQW) structures containing a thin (10‐20 nm) ZnO channel layer, were grown on a‐plane sapphire substrates by plasma‐…
A photo-thermoelectric technique was employed to perform anisotropic thermal diffusivity measurements in nanocomposites and multilayer structures. In this technique a thermal wave is produced into the specimen by absorption of modulated laser radiation while the thermal wave is detected using a fast thermoelectric eff…
Single crystals of the anhydrate and hydrate [4-OH-BZA + H 2 O] with 1:1 stoichiometry of 4-hydroxybenzamide (4-OH-BZA) were grown, and their structures were solved by X-ray diffraction methods. Furthermore, the temperature dependence of the vapor pressure of the anhydrate phase was obtained, and the thermodynamic par…
We report a novel composite: layered double hydroxides (LDHs) encapsulated in vesicles. It was found that positively charged Mg3Al-LDH nanoparticles can induce the spontaneous formation of vesicles in a mixture of a zwitterionic surfactant, dodecyl betaine (C12BE), and an anionic surfactant, sodium bis(2-ethylhexyl) s…
The synthesis and structure of a series of novel phosphine ligands derived from the condensation of P(CH2NH2) with aldehydes are described. Depending on the reaction conditions, either substituted tris(iminomethyl)phosphine, P(CH2N=CHR)3, or 1,3,5-triaza-7-phosphaadamantane structures substituted at the "lower rim", P…
A combined experimental (Raman and electronic spectroscopies) and theoretical (DFT, TD−DFT, and CPHF) study on three octopolar molecules constituted by a central benzene group ramified with acetylene spacers and pyridine groups is presented. Special emphasis is placed on the evolution of the optical properties upon pr…
The stability of the various facets in oxygen-induced faceting of Re(1231) has been studied by low-energy electron diffraction, scanning tunneling microcopy, and synchrotron-based high-resolution X-ray photoemission spectroscopy. When Re(1231) is annealed at 800-1200 K in oxygen (10(-7) Torr), the surface becomes comp…
Optimized model potentials for mercury-mercury and mercury-carbon interactions are used in molecular dynamics simulations to study wetting and solidification of liquid mercury encapsulated in single-walled carbon nanotubes. The contact angle of mercury in the nanotube cavity increases linearly with wall curvature. The…
The methods of synthesis of hyperbranched polymers are considered and systematized with main attention focused on such modern and promising procedures of crosslinking free-radical polymerization as living chain and intense chain transfer regimes. The synthetic approach to hyperbranched polymers via free-radical oxidat…
Super-microporous organosilica with bridging ethylene and pendant vinyl groups has been synthesized by assembling predefined nanobuilding block polyhedral oligomeric silsesquioxanes (POSS) with nonionic surfactant Brij-76 as the template. The material shows wormhole-like super-micropores with uniform size of 1.9 nm, h…
Lateral diffusion of a single polyelectrolyte probe, poly(2-vinylpyridine) (P2VP), on the surface of thermoresponsive poly( N -isopropylacrylamide) (PNIPAM) brushes was studied by fluorescence correlation spectroscopy. Measurements were conducted at a condition of a low pH value and a low salt concentration, under whi…
First-principles-based methods are used to determine the external dielectric susceptibility (i.e., the polarization response to the external electric field) and the internal susceptibility (i.e., the polarization response to the average internal field) in ferroelectric dots, wires, and films, as a function of the elec…
Transparent Ni(2+)-doped Li(2)O-Ga(2)O(3)-SiO(2) glass ceramics (GCs) were prepared and characterized. By controlling the size of the nanocrystals, the infrared luminescence is tunable. It could be ascribed to alteration of the crystal field strength Dq of octahedral Ni(2+), which is due to the changes of the lattice…
Transparent and flexible thin film transistors (TFTs) with channel layers composed of sintered HgTe nanocrystals were fabricated on top of UV/ozone treated plastic substrates and their electrical properties were characterized. A representative TFT with a channel layer composed of sintered HgTe nanocrystals revealed ty…
Boron nitride nanotubes (BNNTs) were found to induce a new phase in ionic liquids and form gels. The new phases indicate ordering of the ionic liquids' molecules on the surface of BNNTs. An elastic network exists within the gels, which is suggested to originate from a pseudo- X -linked solid structure consisting of BN…