Materials Literature
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Poly(ethylene glycol) oligomers have been found to be effective as alternative solvents for the ion exchange of Mn 2+, Fe 2+, and Co 2+ into hydrated and dehydrated Zeolite X (Na 80 Al 80 Si 112 O 384 · n H 2 O). When attempted in aqueous solutions, the exchange of these cations quickly leads to destruction of the zeo…
ADVERTISEMENT RETURN TO ISSUEPREVLetter to the EditorNEXTAssessing the Safety of Nanomaterials by Genomic Approach Could Be Another AlternativeTin-Lap Lee*, Wai-Yee Chan, and Owen M. RennertView Author Information Section on Developmental Genomics, Laboratory of Clinical Genomics, Eunice Kennedy Shriver National Insti…
A novel process that allows selective growth of ZnO nanostructure at room temperature is reported. Various zinc oxide nanostructures were grown on nanoparticle-seeded glass substrates using a new, low cost, and low temperature process. The growth took place in a radio frequency magnetron sputter deposition chamber. Th…
Abstract Graft copolymerization of low‐density polyethylene (LDPE) with a maleic anhydride (MAH) was performed using intermeshing corotating twin‐screw extruder in the presence of benzoyl peroxide (BPO). The LDPE/polyamide 6 (PA6) and LDPE‐ g ‐MAH/PA6 blends were prepared in a corotating twin‐screw extruder. The melt…
Abstract Reaction of low surface area carbon with a mixture of urea and boric acid at 930 °C yields a composition close to BC 4 N with a graphitic structure. BC 4 N was characterized by electron energy loss spectroscopy, X‐ray photoelectron spectroscopy, transmission electron microscopy, Raman spectroscopy, and X‐ray…
Spin precession has been used to measure the transmission time $\ensuremath{\tau}$ over a distance $L$ in a graphene sheet. Since conduction electrons in graphene have an energy-independent velocity $v$, one would expect $\ensuremath{\tau}\ensuremath{\ge}L/v$. Here we calculate that $\ensuremath{\tau}<L/v$ at the D…
Abstract Photocontrolled living anionic ring‐opening polymerization (ROP) of strained silicon‐bridged [1]ferrocenophanes Fe( η ‐C 5 H 4 ) 2 SiMe(CH 2 CH 2 CF 3 ) ( 1 ), Fe( η ‐C 5 H 4 ) 2 SiMe(CH 2 CH 2 (CF 2 ) 7 CF 3 ) ( 2 ) and Fe( η ‐C 5 H 4 ) 2 SiMe(CH 2 CH 2 CH 2 C 6 F 5 ) ( 3 ) with 3,3,3‐trifluoropropyl, heptad…
This study aimed at fabricating porous crack-free and delamination-free La0.6Sr0.4CoO3−δ electrodes using nanopowders and investigating oxygen reduction (occurring at solid oxide fuel cell cathodes) and oxygen evolution (occurring at solid oxide electrolysis cell anodes) at 600 °C in air. The electrodes were deposited…
The striking coloration of the weevil Lamprocyphus augustus is the result of exoskeleton photonic structures with a diamond-based lattice. Michael Bartl and co-workers report on p. 107 on the development of a sol–gel templating method to convert these unique biopolymeric structures into high-dielectric replicas. Theor…
A series of sandwich compounds of transition metals (M=Ni, Fe, Cr) with cyclic hydrocarbon (M(CH)(n)) and borane (M(BH(2))(n)), ligands (including mixed hydrocarbon/borane sandwiches) has been studied using density functional theory (B3LYP/6-311+G(df,p)). Multicenter bonding between the central metal atom and basal cy…
Abstract 9 P ‐GeSb 4 Te 4 is a new germanium antimony telluride that can be obtained from the elements as a homogeneous phase by quenching a stoichiometric melt and subsequently annealing the sample at 500 °C. The crystal structure consists of alternating antimony layers similar to those in elemental antimony and rock…
Ein neuer Aspekt in der Cobaltdioxolen-Chemie: Die Herstellung und Charakterisierung des ersten Low-Spin-Cobalt(II)-Semichinonatkomplexes wird beschrieben. Der temperaturinduzierte Wechsel des Spinzustands in diesem Komplex (siehe Schema) ist nicht wie gewöhnlich mit einer Valenztautomerisierung, sondern mit einem Spi…
Amyloid fibril disaggregation has been observed recently upon incubation with lipid vesicles, challenging the view of fibrils as end states of the aggregation process in vivo. Here, we follow fibril disaggregation in the presence of lipid vesicles by means of molecular dynamics simulations, using simplified models of…
Uniformly sized and shaped nanoparticles are well suited for the quantitative characterization of optical-powder properties. For the first time, quantum yields related to photoluminescence emissions that originate from the photoexcitation of MgO nanocube corners and edges are measured. In addition, the surfaces of the…
Stenciling graphene, carbon nanotubes, and fullerenes, all of which are in hydrazine, can be stenciled onto substrates using a thin elastiomeric membrane composed of poly(dimethylsiloxane) (see figure). This method represents a flexible route to stencil a family of carbon nanomaterials and could be used for patterning…
Abstract Dendron‐like poly(γ‐benzyl‐ L ‐glutamate)/linear poly(ε‐caprolactone)/dendron‐like poly(γ‐benzyl‐ L ‐glutamate) triblock copolymers having 2 m + 1 PBLG branches (denoted as PBLG‐Dm‐PCL‐Dm‐PBLG, m = 0, 1, 2, and 3) were for the first time synthesized by utilizing ring‐opening polymerization (ROP) and click che…
Up the junction! Au/molecule/Au junctions were obtained by spreading Au NPs over an Au substrate pre-adsorbed with molecules with a bifunctional group. Molecules binding to the surface with the heterocyclic aromatic molecules show signature a band after the formation of molecular junctions, as revealed by SERS and qua…
Abstract In this contribution, high‐throughput screening experiments are reported to study the polymerization of different aromatic polyurethane (PU) prepolymers. The prepared prepolymers were synthesized from toluene diisocyanate (T80) with different molar mass polyether diols and polyether triols, respectively. The…
The principles of crystal engineering can be used in a contrary way to help devise molecules that resist crystallization and form long-lived glasses. This can be achieved by making structural changes that thwart established patterns of crystallization. In using this strategy to block the crystallization of triarylamin…
Abstract The removal of arsenate anions from aqueous media, sediments and wasted soils is of environmental significance. The reaction of gypsum with the arsenate anion results in pharmacolite mineral formation, together with related minerals. Raman and infrared (IR) spectroscopy have been used to study the mineral pha…