Materials Literature
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A series of polymer-coated Au nanoparticles have been prepared using the "grafting-to" approach. Thiol-terminated polystyrene and poly(ethylene oxide) ligands are found to form dense brushes on the faceted gold nanoparticle surfaces. Depending on the polymer, the ligand grafting densities on the gold nanoparticles are…
Powders of single-crystalline β-nickel hydroxide (β-Ni(OH) 2 ) nanosheets with the hexagonal structure have been successfully synthesized by the hydrothermal method at 200 °C using nickel acetate as the nickel source and aqueous ammonia as both an alkaline and complexing reagent. The yields of β-Ni(OH) 2 nanosheet pow…
A rich harvest: A visible-light-harvesting system has been created utilizing an organogel medium (see picture; the inset shows different gel mixtures). Mixing four different perylene derivatives in the gel phase sets up an energy gradient in the gel fibrils. The well-defined nanofibers harvest a wide range of light en…
Magnetic, magneto-transport properties and electronic specific heat coefficient of the Mn 2 Sb 0.88 Ge 0.12 compound have been studied. A metamagnetic transition from antiferromagnetic to ferrimagnetic, which is induced by an external field, is accompanied with a large negative magnetoresistance (MR) effect. The MR ra…
Lipids are the main constituents of biological cell membranes, and their liquid crystalline properties play a crucial role in cell functions. We have discovered that dodecyl-beta-D-glucopyranoside glycolipid layers can be electrically polarized in supramolecular structures of glycolipid and bent-core ("banana-shape")…
Polarization effects play an even more important role in nonlinear optics than in linear optics because of the richer set of phenomena describable by higher-order tensor relations. The present contribution surveys some recent research on polarization aspects of nonlinear optical interactions, paying special attention…
The spontaneous oxidation of CO adsorbates on a Pt electrode modified by Ru under open circuit (OC) conditions in perchloric acid solution has been followed, for the first time, using in situ FTIR spectroscopy, and the dynamics of the surface processes taking place have been elucidated. The IR data show that adsorbed…
[structure: see text] A series of the title dimeric quinquethiophenes linked with a di- to hexamethylene spacer was synthesized and examined as a pi-dimer model of polythiophene. Upon two-electron oxidation with iron(III) chloride in dichloromethane, they readily form intramolecular pi-dimer species, except for the di…
Abstract We successfully formed a series of inclusion complexes (ICs) between an α‐cyclodextrin (α‐CD) host and two kinds of guest polymers, nylon‐6 and nylon‐66. An attempt to achieve an intimate blend between nylon‐6 and nylon‐66 through the formation and dissociation of their common α‐CD IC was made. The formation…
On the basis of temperature-programmed desorption and isothermal reaction mass spectrometry, the thermal surface chemistry of trimethyl acetic acid, (CH 3 ) 3 CCOOH, dosed onto a well-characterized single-crystal TiO 2 (110) surface is described. Deprotonation occurs at or below 300 K to form trimethyl acetate, (CH 3…
New optically active hyperbranched polymers have been used as microenvironments as well as scaffolds for noncovalent and covalent immobilization of pincer platinum(II) complexes, respectively. The catalytic activity/selectivity of the incorporated platinum(II) complexes in these polymeric chiral supports was investiga…
Blue phases (BPs) are cubic phases of cholesteric liquid crystals (CLC) with a sufficiently short pitch. They occur in three different phases (BPI, BPII, BPIII) in small temperature ranges between the cholesteric and the isotropic state. Light reflected by BP crystals is partially circularly polarized. Calculating the…
A new formulation of the polymer reference interaction site model (PRISM) theory for suspensions of hard spheres and rigid rods has been developed. The nonlocal loss of orientational entropy when a rod is near an impenetrable particle is accounted for in a thermodynamically self-consistent manner. In the ideal needle…
Abstract Reactions of gold phosphane complexes [(AuX)(PR 3 )] (X = Cl, Br, I; R = organic moiety) with Se(SiMe 3 ) 2 lead to the formation of gold complexes with chalcogenide bridges. The reaction of the complex [Ph 3 PAuCl] and t BuSe(SiMe 3 ) gives the cluster [Au 5 Se 2 (PPh 3 ) 4 ]Cl ( 1 ). The in situ preparation…
Bulk and surface energies are calculated for endmembers of the isostructural rhombohedral carbonate mineral family, including Ca, Cd, Co, Fe, Mg, Mn, Ni, and Zn compositions. The calculations for the bulk agree with the densities, bond distances, bond angles, and lattice enthalpies reported in the literature. The calc…
The thermal decomposition of methyltrichlorosilane (MTS) was studied in a flow system in the temperature range of 825−977 K and pressure range of 10−120 Torr. Yields of products were measured by gas chromatography. The rate constant, k 1, for the initiation reaction was determined from the sum of the rates of the term…
Abstract Pr 6 O 11 single‐crystal nanotubes with a typical 3‐D crystal structure in the bulk have been successfully obtained through a template‐free molten‐salt synthetic method, the formation of which has been attributed to the periodical defect cluster distribution in the Pr 6 O 11 species. It is believed that the s…
Abstract In the field of organic‐inorganic hybrid composites, functionalized polyoxometalates constitute a special class of inorganic nanobuilding blocks (NBBs). This study represents a first approach related to the formation of new oligomeric hybrid species based on the reaction of bis(electrophilic) groups with a di…
A new three-dimensional finite element method model of the conventional resistive thermal probe, usually employed within scanning thermal microscopy (SThM) has been developed. As a result, the line heat source characteristic of the bent thermal sensitive filament seems to permit the explanation of the experimental res…
The synthesis of poly(hydridocarbyne), one of a class of carbon-based random network polymers and a structural isomer of polyacetlyene, is reported. The network backbone of this polymer is primarily composed of tetrahedrally hybridized carbon atoms, each bearing one hydride substituent and linked via three carbon-carb…