Materials Literature
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A new method of grafting conjugated polymers onto solid substrates by self-assembled monolayers (SAM) and electrochemistry is described. The polyfluorene was designed to have the carbazole group as the pendant group to offer electropolymerizability. As has been studied, carbazole is easily electropolymerized by cyclic…
We use molecular-dynamics simulations in two dimensions to investigate the possibility that a core-softened potential can reproduce static and dynamic anomalies found experimentally in liquid water: (i) the increase in specific volume upon cooling, (ii) the increase in isothermal compressibility upon cooling, and (iii…
Hydroxyl-terminated poly(amidoamine) (PAMAM) dendrimers of generation 2−4 (G n -OH, n = 2, 3, and 4; M r ∼ 3.7, 6.9, and 14.3 kDa, respectively) and dendrimers encapsulating Cu 2+ ions have been investigated by matrix-assisted laser desorption ionization time-of-flight (MALDI-TOF) mass spectrometry. Umbelliferone (7-h…
Photocatalytic activity of lanthanide tantalates, LnTaO 4 (Ln = La, Ce, Pr, Nd, and Sm), for water splitting was studied in connection to the effect of Ln 4f levels on the electronic structure. Valence band XPS, UV−vis, and first-principle electronic calculations suggested that the position of Ln 4f levels becomes low…
ADVERTISEMENT RETURN TO ISSUEPREVCommentNEXTComment on the Relationship of the Pyramidalization Angle at a Conjugated Carbon Atom to the σ Bond AnglesR. C. HaddonView Author Information Departments of Chemistry and Chemical & Environmental Engineering, University of California at Riverside, Riverside, California 92521…
Dealloying is a common corrosion process during which an alloy is "parted" by the selective dissolution of the electrochemically more active elements. This process results in the formation of a nanoporous sponge composed almost entirely of the more noble alloy constituents . Even though this morphology evolution probl…
The stoichiometric RuO 2 (110) surface is terminated by bridge-coordinated oxygen atoms (O β ) and by coordinatively unsaturated Ru (Ru cus ) atoms. Exposure to gaseous O 2 leads to the formation of two additional surface species: a molecularly chemisorbed state (O δ ) bridging two neighboring Ru cus atoms and weakly…
A symmetry-general scheme for the simultaneous least-squares extraction of the elastic coefficients and of the residual strain components from ab initio total energy calculations on crystal structure models of materials is proposed. It is quite efficient and avoids error propagation. An appropriate, but usually singul…
A detailed line-shape analysis of the tangential G-band feature attributable to metallic single-walled carbon nanotubes is presented. Only two components are needed to account for the entire G-band feature for metallic nanotubes. The higher-frequency component has a Lorentzian line shape, and the lower one has a Breit…
The backbone conformation of a comblike polymethacrylate, PMA-CH 3, was studied by small-angle neutron scattering in the nematic phase. The backbone is perpendicular to the mesogenic side chain moieties, corresponding to the oblate ellipsoid of the N I phase of Wang and Warner's theory. We have measured the temperatur…
A brief overview is provided of the principal research and development activities of the Laboratory of Polyelectrolytes and BioMacromolecules at the Swiss Federal Institute of Technology. These include, in particular, the synthesis of tailor-made polyelectrolytes, the development of novel materials based on polyelectr…
To understand the molecular mechanisms responsible for the adhesion between isotactic polypropylene (iPP) and polyamide 6 (PA6) in the presence of iPP−PA6 diblock copolymer, thin film assemblies with a typical thickness of 115 nm have been prepared. The crystalline orientation of the iPP and of the PA6 close to the in…
We have investigated theoretically the conductance through finite-sized carbon nanotubes coupled to featureless leads in the context of standard tight-binding models. Conduction takes place via resonant tunneling, and the resultant spectrum of peaks may be understood in terms of the band structure of the nanotubes. Sp…
In the last 15 years the use of plasma for materials processing has received a great amount of interest. The scope of possible applications is expanding rapidly and covers a large range of different fields. Applications may be found in microelectronics, food packaging, decorative and functional coatings; many differen…
One of the most important parameters that determine the transport properties of a quantum dot array is the exciton dissociation energy, i.e., the energy $\ensuremath{\Delta}E$ required to dissociate an exciton into an electron and a hole localized in different dots. We show that a pseudopotential calculation for a dot…
We extended the sensitivity of Raman correlation spectroscopy in solution to the single-molecule level by applying surface- and resonance-enhanced Raman scattering (SERRS) combined with time-gated, confocal signal detection. The brightness of the SERRS signal of single Rhodamine 6G molecules adsorbed on a single silve…
Phase transitions and staging in doped single-wall carbon nanotubes (SWNT's) are controversial issues. Here, we report on combined in situ conductivity and Raman measurements of Rb-doped SWNT's. Striking correlations between resistance, changes of resistance under laser irradiation, and frequency of the main Raman pea…
Relations between the thermodynamics and dynamics of supercooled liquids approaching a glass transition is a topic of considerable interest. The potential energy surface of model liquids has been increasingly studied, since it provides a connection between the configurational component of the partition function on the…
Dense poly(styrene sulfonate sodium salt) brushes were prepared on silicone wafers using a two-step procedure: polystyrene (PS) chains, terminated by a reactive trichlorosilane group, were first covalently grafted, and then the PS brush was converted to a poly(styrene sulfonate) brush by a soft sulfonation reaction. E…
The magnetic ground state of perovskite structure ${\mathrm{CaRuO}}_{3}$ has been enigmatic for decades. Here we show that paramagnetic ${\mathrm{CaRuO}}_{3}$ can be made ferromagnetic by very small amounts of partial substitution of Ru by Ti. Magnetic hysteresis loops are observed at 5 K for as little as 2% Ti substi…