Materials Literature
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Selective hydrogenation of the C═O group of acrolein produces the chemically important intermediate propenol. Addition of the second metal indium to gold catalyst notably improves the selectivity to the desired ally alcohol. The role of indium was previously ascribed to block active sites on faces for the C═C hydrogen…
This work reports on the structural and optical properties of multilayers composed of silicon dioxide (SiO2) and silicon rich silicon nitride (SRN) films. These nanometer scale layers have been alternately deposited by electron cyclotron resonance plasma enhanced chemical vapor deposition (ECR-PECVD) on quartz and sil…
We report the resistivity of a series of nominally fluorine-doped ${\text{SmFeAsO}}_{1\ensuremath{-}x}{\text{F}}_{x}$ polycrystalline superconductors in magnetic fields up to 60 T. For samples where $x<0.15$, the low-temperature resistive state is characterized by pronounced magnetoresistance including an upturn at…
In general, pressurized CO 2 is soluble in polymers (to a concentration determined by the pressure) and affects the polymer relaxation behavior. Focusing on segmental relaxation, this study conducted dielectric measurements for racemic dl -poly(lactic acid) (PLA) as well as polystyrene (PS) under carbon dioxide (CO 2…
We report the synthesis and characterization of two hydroxo-bridged dinuclear cupric complexes, HPC [((phen) 2 Cu−OH−Cu(phen) 2 ) 3+, phen = 1,10-phenanthroline] and HBC [((bpy) 2 Cu−OH−Cu(bpy) 2 ) 3+, bpy = 2,2′-bipyridine], encapsulated in porous materials for the oxidation of 3,5-di- tert -butylcatechol (DTBC) to t…
A polyelectrolyte multilayer (PEM) fabricated by the layer-by-layer (LbL) self-assembly of weak polyions of polyacrylic acid (PAA) and polyallylamine (PAH) was applied as a matrix for the in situ nucleation and growth of pure and Mn-doped ZnS nanocrystallites. The nucleation and growth is initiated by the adsorption a…
A new compound, Bi(3)Mn(3)O(11), with a KSbO(3)-type structure was prepared using a high-pressure technique. Its structural, chemical, and magnetic properties have been investigated. Bi(3)Mn(3)O(11) was shown to be a ferrimagnet with rather high T(C) despite the random distribution of manganese ions with different oxi…
The magnetoelectric effect of a laminate composite made by sandwiching a Rosen-type Pb(Mg 1/3 Nb 2/3 )O 3 –PbTiO 3 (PMN–PT) single crystal transformer between two length-magnetized magnetostrictive Tb 0.3 Dy 0.7 Fe 1.92 (Terfenol-D) alloy plates has been investigated. An additional giant sharp longitudinal–longitudina…
Myelin figures are interfacial structures formed when certain surfactants swell in excess water. Here, I present data and model calculations suggesting the formation and growth of myelins is due to the fluid flow of surfactant, driven by the hydration gradient at the dry surfactant/water interface; a simple model base…
Single-phase layered Nb-substituted titanates, Na(2)Ti(3-x)Nb(x)O(7) (x = 0-0.06) and Cs(0.7)Ti(1.8-x)Nb(x)O(4) (x = 0-0.03), were for the first time synthesized by a novel sol-gel assisted solid state reaction (SASSR) route. Conventional solid state reactions as well as sol-gel synthesis did not succeed in producing…
Reflective and surface conductive polyimide films were prepared by the incorporation of silver(I) acetate and trifluoroacetylacetone into a dimethylacetamide solution of the poly(amic acid) formed 3,3',4,4'-oxidiphthalic dianhydride (ODPA) and 4,4'-oxidianiline (4,4'-ODA). Thermal curing of (trifluoroacetylacetonato)s…
Here we present resonant soft x-ray diffraction data in the vicinity of the $\text{Mn}\text{ }{L}_{2,3}$ edges on ${R}_{1\ensuremath{-}x}{T}_{x}{\text{MnO}}_{3}$ manganites ($R=\text{Pr}$, Nd and $T=\text{Ca}$, Sr) close to half doping. For ${\text{Pr}}_{0.6}{\text{Ca}}_{0.4}{\text{MnO}}_{3}$ (PCMO), the energy depend…
The behaviors of 15 kinds of metal ions in the thiol-capped CdTe quantum dots (QDs)-H2O2 chemiluminescence (CL) reaction were investigated in detail. The results showed that Ag+, Cu2+ and Hg2+ could inhibit CdTe QDs and H2O2 CL reaction. A novel CL method for the selective determination of Ag+, Cu2+ and Hg2+ was devel…
The surface of glassy carbon powder (4 μm diam, 2 m 2 /g) was modified with a thin layer of boron-doped ultrananocrystalline diamond (B-UNCD) for the purpose of improving the dimensional stability and corrosion resistance of the material. The UNCD layer was deposited by microwave-assisted chemical vapor deposition usi…
Nucleation in solution is a stochastic phenomenon and thus difficult to control. We present here an in situ investigation of the control of spatial and temporal localization on the nucleation event, using two approaches. We show how creating localized fields and fluxes and/or preventing convection lead to effective co…
PbSe nanocrystals represent the paradigm nanoscale system exhibiting carrier multiplication upon light absorption, yet their absorption spectrum is poorly understood. Two very different interpretations of the absorption peaks have been proposed: is the second absorption peak a dipole-forbidden ${S}_{h}\text{\ensuremat…
Silicon nanocrystals were synthesized at high temperatures and high pressures by the thermolysis of diphenylsilane using a combination of supercritical carbon dioxide and phosphonic acid surfactants. Size and shape evolution from pseudo-spherical silicon nanocrystals to well-faceted tetrahedral-shaped silicon crystals…
Magnetism in graphene is of fundamental as well as technological interest, with potential applications in molecular magnets and spintronic devices. While defects and/or adsorbates in freestanding graphene nanoribbons and graphene sheets have been shown to cause itinerant magnetism, controlling the density and distribu…
Abstract Block copolymers based on a polyesteramide sequence and a polyether block were synthesized in bulk at 250 °C by ring‐opening copolymerization (ROP) of ε ‐caprolactone (CLo) and ε ‐caprolactam (CLa) as initiated by Jeffamine® M1000, i.e., ω ‐NH 2 copoly[(ethylene oxide)‐ co ‐(propylene oxide)] copolymer [P(EO‐…
Phase-field models provide a way to model fluid interfaces as having finite thickness; the interface between two immiscible fluids is treated as a thin mixing layer across which physical properties vary steeply but continuously. One of the main challenges of this approach is in resolving the sharp gradients at the int…