Materials Literature
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Sodium fatty alcohol polyoxypropylene ether sulfates and sodium fatty alcohol polyoxyethylene ether sulfates are nonionic–anionic surfactants, and this paper is devoted to study the synthesis and evaluation of this kind of surfactants. Using 1-bromhexadecane as raw material, homogeneous sodium hexadecyl polyoxypropyle…
The self-assembly of rigid three-legged building blocks into polyhedral cages is investigated by patchy particle simulations. A four-site anisotropic interaction potential is introduced to make pairs of overlapping legs bind in an anti-parallel fashion, thereby forming the edges of a polyhedron of pentagons and hexago…
The compound $\ensuremath{\lambda}\text{\ensuremath{-}}{(\text{BETS})}_{2}{\text{FeCl}}_{4}$ provides an effective demonstration of the interaction of $\ensuremath{\pi}$ conduction electron and $d$-electron localized moment systems in molecular crystalline materials where antiferromagnetic insulating and magnetic fiel…
The relaxation behavior of poly(methyl methacrylate) (PMMA), spin-coated on a silicon wafer, at the water interface was examined by lateral force microscopy as a function of temperature and scanning rate. Even in water, the lateral force peak which was assigned to the segmental motion of PMMA plasticized by water mole…
We calculate the optical and dc conductivity for half-filled disordered Hubbard model near the Mott metal-insulator transition. As in the clean case, large metallic resistivity is driven by a strong inelastic scattering, and Drude-like peak in the optical conductivity persists even at temperatures when the resistivity…
Gegensätze ziehen sich an: „Pt-auf-Au“-Nanokomposite entstehen durch elektrostatische Selbstorganisation (siehe Bild; PDDA=Poly(diallyldimethylammoniumchlorid)) und sind in der Oxidation von Ameisensäure viel aktiver als reine Pt-Katalysatoren. Ein möglicher Grund hierfür ist der effiziente HCOO-Übertritt vom Au- auf…
Linear optical responses of double concentric nanoshells (DCN), consisting of two alternating layers of dielectric and metal, are studied using the Mie theory and plasmon hybridization theory. Reduction of thickness either of the metallic layers or the second dielectric layer produces red-shifts of the |ω − − ⟩ energy…
Abstract Mesoporous boehmite and gamma‐alumina with nanorod‐like morphology, exhibiting a high surface area and large pore volume, have been prepared by a nonsurfactant‐templating sol–gel technique with a simple precursor system, aluminum isopropoxide, ethanol, 2‐propanol, or 2‐butanol as solvents, and sulfuric or hyd…
Abstract 2,2′:6′,2″‐Terpyridines bearing well‐defined π‐conjugated substituents at the 4′‐position are known to exhibit interesting electronic and optical properties. The systematic variation of both the spacer unit and the linker in conjugated bis(terpyridines) has resulted in a library of π‐conjugated systems, enabl…
An electromagnetic energy squeezing mechanism is proposed based on the special properties of permeability-near-zero metamaterials. It is found that nearly no energy stream can enter a simply connected conventional dielectric material positioned inside a permeability-near-zero material. When the dielectric domain is sh…
Abstract A series of dendrimer‐containing polyoxometalates(DENDRIPOMs) was synthesized by coupling zirconium‐peroxotungstosilicate [Zr 2 (O 2 ) 2 (SiW 11 O 39 ) 2 ] 12– with ammonium dendrons by electrostatic bonding. These DENDRIPOMs were successfully characterized by standard physicochemical techniques (e.g. IR and…
Discrete plasmonic Talbot effect in the subwavelength metal waveguide arrays (SMWAS) is theoretically analyzed and numerically simulated. Based on the finite-difference time-domain technique, we discuss the influence of the structural parameters on the Talbot distance. By carefully choosing the geometry parameters, th…
The ability of subwavelength structures to create an artificial effective index opens up new perspectives in designing highly efficient diffractive optical elements. We demonstrate a design approach for binary multi-phase level computer generated holograms based on the effective medium approach. The phase pattern is f…
Cyclopolymerization of isopropylidene diallylmalonate (1) in CH(2)Cl(2) using as the initiator a crystallographically defined alpha-diimine Pd(II) complex with a trans-azobenzene strap (trans-3) proceeds stereospecifically to give a cycloolefinic polymer that is rich in threo-disyndiotactic sequences (st(rich)-2; synd…
We report the discovery of a new class of clusters consisting of Au(n)(BO(2)) that forms during the oxygenation of gold clusters when boron nitride is used as insulation in a pulsed-arc cluster ion source (PACIS). Photoelectron and mass spectroscopy of these clusters further revealed some remarkable properties: instea…
The hydrogen (H) incorporation in the epitaxial graphene buffer layer on $6H\text{-SiC}(0001)$ with various H coverages is investigated using the density-functional method. The most stable site for a single H atom is on top of a threefold C atom in the graphene buffer layer, whereas the incorporation into the interfac…
The thermal- and photoinduced valence tautomerism of a cobalt bis(dioxolene) complex is described. The thermal conversion is precipitous, complete within 10 K, and is accompanied by a 5 K hysteresis loop (107 K < T(1/2) < 112 K). Rapid thermal quenching (300 K --> 10 K in ca. 5 s) and photoinduced valence tautomerism…
A series of new molecular hybrids with stilbene chromophore ( H1 − H4 ) are prepared by hydrosilylation of octahydridosilsesquioxane ( T 8 H ). All these stilbene-containing hybrid materials are soluble in common organic solvents, such as chloroform, toluene, THF, and 1,2-dichloroethane, and possess good film-forming…
Abstract The influence of the stabilizer/SWNT ratio on the transport behavior of latex‐based polymer nanocomposites is examined in an effort to improve electrical conductivity while maintaining or improving the Seebeck coefficient (i.e., thermopower). Results show that phonon and electron transport are significantly a…
The unique size- and shape-dependent electronic properties of nanocrystals (NCs) make them extremely attractive as novel structural building blocks for constructing a new generation of innovative materials and solid-state devices. Recent advances in material chemistry has allowed the synthesis of colloidal NCs with a…