Materials Literature
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We report a strategy for patterning surfaces with high aspect ratio gold nanorods (Au NRs) by using a poly(dimethylsiloxane) (PDMS) stamp to microcontact print 3−5 nm diameter gold nanoparticle (Au NP) “seeds” onto mercaptan-functionalized Si/SiO x surfaces and subsequently grow the seeds into Au NRs via seed-mediated…
We report on ensemble Monte Carlo transport simulations for semiconducting, single-wall, zigzag carbon nanotubes. The basis for the Monte Carlo simulations is provided by electronic structure calculations within the framework of a simple tight-binding model that takes the effect of the tube curvature on the band struc…
Carefully selected combinations of directional forces can be used to rationally engineer crystals with particular anisotropic features. This approach has led to the generation of cleavable molecular crystals with parallel 15-Å channels by dipole-directed stacking of hydrogen-bonded sheets (see crystal structure). The…
The electron-phonon matrix elements are calculated for the radial breathing mode (RBM) and the $G$-band $A$ symmetry mode of single-wall carbon nanotubes. The RBM intensity decreases with increasing nanotube diameter and chiral angle. The RBM intensity at van Hove singular $k$ points is larger outside the two-dimensio…
Abstract Summary: The interaction of Cu 2+ with C, N and O moieties in nanocomposites containing copper ions complexed in poly(amidoamine‐organosilicon), PAMAMOS, dendrimer networks was characterized using near edge X‐ray absorption fine structure (NEXAFS). The effects on the 1s → π * and 1s → σ * orbital transitions…
Cu – Si O 2 – Si N x interconnects that were located 0.65–2.7-μm below the surface of silicon-integrated circuits were imaged in a scanning electron microscope and a transmission electron microscope with a scanning attachment by detecting backscattered electrons (BSEs) with an incident electron-beam energy (Eo) in the…
Abstract A series of manganese oxide‐loaded SBA‐15 (MnSBA‐ x h, x = 1, 2, 3, 4, 5, 6; h: hour(s)) mesoporous materials are synthesized via a facile, in‐situ reduction method with a surfactant template. The composite materials are characterized using Fourier‐transform infrared spectroscopy, X‐ray diffraction, N 2 sorpt…
Abstract Summary: Copolymers of ω ‐perfluorooctyalkyl acrylate C 8 F 17 ‐(CH 2 ) n′ OC(O)CHCH 2 with butyl acrylate were prepared by free radical polymerization. These compounds were characterized by 1 H and 19 F NMR spectroscopy. Thermal properties were evaluated by DSC and TGA analysis. By changing the fluorinated…
A new method for analyzing second-order phase transitions is presented and applied to the polaronic system La(0.7)Ca(0.3)MnO3. It utilizes heat capacity and thermal expansion data simultaneously to correctly predict the critical temperature's pressure dependence. Analysis of the critical phenomena reveals second-order…
Protein binders: Three representative polyoxometalate (POM) compounds, for example 1, which is of the Wells–Dawson class, were found to interact with the basic fibroblast growth factor (bFGF, right). The binding induces dramatic conformational changes in the growth factor. POMs are promising leads for compounds that m…
Hexagonal arrangement of iron oxide nanoparticles was fabricated by utilizing a single-layered film of diblock copolymer micelles. The synthesis was directly performed on the solid substrate by oxygen plasma with preserving the dimensional order of micelles so that separate procedures for synthesis and deposition of n…
We have previously demonstrated that the formation of and coalescence from polymer−cyclodextrin (CD) inclusion compounds (ICs) represents a very useful approach to modify the chain conformations and improve the crystallinity of various bulk polymers. The present work deals, for the first time, with the formation of a…
Within the framework: The fused benzodipyrrole unit within the sapphyrin 1 has a significant influence on its structure as compared to those of usual sapphyrins. The fused benzene ring partly inhibits distortion of the macrocycle about the dipyrrole unit (see structure of 1⋅2 H+ 2 (p-CH3C6H4SO3−); C gray, N blue, O re…
Abstract Perovskite titanates with nominal stoichiometry ABO 3+δ often exhibit quite interesting properties, but their structural characterization is not always rigorous. Herein, we demonstrate how excess oxygen can be incorporated in a titanate perovskite‐based lattice. A new family of layered perovskites La 4 Sr n –…
The mechanism of the formation of Si-C bonded monolayers on silicon by reaction of 1-alkenes with hydrogen-terminated porous silicon surfaces has been studied by both experimental and computational means. We propose that monolayer formation occurs via the same radical chain process as at single-crystal surfaces: a sil…
Abstract p‐Type conduction in amorphous oxide was firstly found in zinc rhodium oxide (ZnO·Rh 2 O 3 ) ( Adv. Mater. 2003 , 15 , 1409), and it is still the only p‐type amorphous oxide to date. It was reported that an ordered structure at the nanometer scale was contained and its electronic structure is not clear yet. I…
Abstract Summary: A convenient three‐step strategy has been developed for the preparation of well‐defined amphiphilic, linear‐hyperbranched block copolymers by hypergrafting. The synthetic procedure is based on a combination of carbanionic polymerization with the alkoxide‐based, controlled ring‐opening multibranching…
Abstract Summary: Polyethylene‐alumina nanocomposites were prepared using in situ polymerization. Alumina nanomers were prepared by treating alumina nanoparticles with an alkylaluminium compound and a vinyl alcohol. This approach led to (a) grafting double bonds onto the alumina surface, and (b) dispersion of alumina…
The theory of semiclassical carrier transport in semiconducting single-walled carbon nanotubes is presented. The focus is on transport in response to a small, axially applied field. Carriers are considered to scatter with longitudinal, torsional, and radial breathing acoustic phonons. Theory predicts large mobilities…
Abstract 1,4‐Bis[2‐(3,4‐ethylenedioxy)thienyl]‐2,5‐bis[6‐(1′‐butyl‐4,4′‐bipyridyl)hexyloxy]benzene tetrahexafluorophosphate (BEDOTPh‐2V) was synthesized and electropolymerized to form a viologen‐bearing conductive polymer [P(BEDOTPh‐2V)] film on an electrode surface. This polymer exhibits multicolor electrochromic beh…