Materials Literature
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Local effects of multiple electrostatic gates placed beneath carbon nanotubes grown by chemical vapor deposition (CVD) are reported. Single-walled carbon nanotubes were grown by CVD from Fe catalyst islands across thin Mo “finger gates” (∼150 nm × 10 nm). Prior to tube growth, several finger gates were patterned litho…
We express the cross section for indirect resonant inelastic X-ray scattering in terms of an intrinsic dynamic correlation function of the system that is studied with this technique. The cross section is a linear combination of the charge response function and the dynamic longitudinal spin density correlation function…
A novel approach is proposed, where energy filtered electrons, carrying both chemical identity and electrical information, serve as fine and flexible electrodes in direct electrical measurements. The method, termed 'chemically resolved electrical measurements' (CREM), is simple and general, demonstrated here with a sl…
The modeling of finite-extent semiconductor nanostructures that are embedded in a host material requires the numerical treatment of the boundary in a finite simulation domain. For the study of a self-assembled InAs dot embedded in GaAs, three kinds of boundary conditions are examined within the empirical tight-binding…
Some of the most popular ways to treat quantum critical materials, that is, materials close to a magnetic instability, are based on the Landau functional. The central quantity of such approaches is the average magnitude of spin fluctuations, which is very difficult to measure experimentally or compute directly from th…
A theory is formulated for time dependent fluctuations of the spectrum of a single molecule in a dynamic environment. In particular, we investigate the photon counting statistics of a single molecule undergoing a spectral diffusion process. Based on the stochastic optical Bloch equation, fluctuations are characterized…
The design and development of composite thin films of polymethylmethacrylate (PMMA) with multiwalled carbon nanotubes (CNTs) and surface-modified multiwalled carbon nanotubes (f-CNTs) for gas-sensing applications are presented in this paper. The responses of these composites for different organic vapors were evaluated…
A method for coating silica on CoFe 2 O 4 and MnFe 2 O 4 spinel ferrite nanoparticles has been developed by using a reverse micelle microemulsion approach. The ability to controllably synthesize magnetic nanoparticulate cores independent of encapsulation provides great flexibility in tuning the magnetic properties of…
We report a systematic evaluation of the use of refluxing nitric acid as a purification treatment for electric arc-produced single-walled carbon nanotubes (SWNTs), by using a combination of thermogravimetric analysis (TGA) and near-infrared (NIR) spectroscopy. Nitric acid is the standard reagent for purification of SW…
Abstract The electronic structure of the cubic perovskites SrTiO 3 , BaTiO 3 , PbTiO 3 , and LaMnO 3 is calculated by Hartree–Fock and density functional theory methods in the approximation of linear combinations of atomic orbitals. The local properties of the electronic structure of these crystals (atomic charges, bo…
We present extensive molecular dynamics simulation results for self-diffusion and viscosity for isoparaffins between C 6 and C 16 and examine the ability of several forms of Stokes−Einstein relationships to link the transport properties in a coherent framework. Based on a hydrodynamic model for drag past prolate ellip…
The outermost atomic layer of perfluorinated thiol monolayers on gold and poly(tetrafluoroethylene) (PTFE) is analyzed by low-energy ion scattering. Absolute quantification of fluorine density in this layer was achieved after calibrating the fluorine signal with a freshly cleaved LiF(100) single crystal. The fluorine…
Abstract Graft copolymerization of methyl methacrylate onto starch was carried out in aqueous medium using Ce(IV)–glucose initiator in the temperature range 40–60°C. Effects of concentration of Ce(IV), glucose, H 2 SO 4 , monomer, and starch on grafting were investigated. Percentages of grafting were evaluated and com…
The high-yield convergent synthesis of dendrons, dendrimers, and dendritic-linear hybrid macromolecules composed of succinic acid, glycerol, and poly(ethylene glycol) (PEG) is described. This convergent synthesis relies on two orthogonal protecting groups; namely, the benzylidene acetal (bzld) for the protection of th…
Bridging nerve gaps by means of autologous nerve grafts involves donor nerve graft harvesting. Recent studies have focused on the use of alternative methods, and one of these is the use of biodegradable nerve guides. After serving their function, nerve guides should degrade to avoid a chronic foreign body reaction. Th…
Abstract The synthesis of new chitosan derivatives and their complete characterization by elemental analysis, Fourier transform infrared, thermogravimetric analysis, and cross‐polarity/magic‐angle‐spinning 13 C NMR is described. A chitosan that was 96.5% deacetylated and had a viscosimetric molecular weight of 131,000…
Silver nanowires are prepared by electroplating into an anodic aluminium oxide (AAO) template. After the AAO template was removed by chemical etching, the surface of Ag nanowires was further modified by pulse DC electroplating. Various Ag nanobranches are grown on the surface of the Ag nanowire. This study discusses t…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTNoncentrosymmetric Structure from a Tetrablock Quarterpolymer of the ABCA TypeA. Takano, K. Soga, J. Suzuki, and Y. MatsushitaView Author Information Department of Applied Chemistry, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 4…
Surface phases of ${\mathrm{Cr}}_{2}{\mathrm{O}}_{3}(0001)$ as a function of ambient oxygen pressure and temperature were computed by ab initio density-functional theory for a solid surface. The surface can be $(1\ifmmode\times\else\texttimes\fi{}1)$ or $(\sqrt{3}\ifmmode\times\else\texttimes\fi{}\sqrt{3})$ Cr termina…
Several 4-(4'-N,N-didodecylaminophenylazo)phenyl 1,2-trans glycosides 5a-e with various carbohydrate heads (beta-D-gluco, beta-D-galacto, beta-lacto, beta-D-xylo, and alpha-D-manno) have been synthesized. The key step was the formation of phenyldiazonium tetrafluoroborates 2a-e from the per-O-acetylated 4-aminophenyl…