Materials Literature
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We report air-stable n-type operations of the single-walled carbon nanotube field effect transistors (SWNT-FETs) fabricated with Gd electrodes. Unlike previously reported n-type SWNT-FETs, our devices maintained their n-type operation characteristics in ambient atmosphere for more than two months. The shallow Gd films…
Abstract A 300 µm thick tensile specimen of OFHC copper is subjected to a tensile loading sequence and deformed to a maximal strain of 3.11%. Using the novel three‐dimensional X‐ray diffraction method ‘High angular resolution 3DXRD', the evolution of the microstructure within a deeply embedded grain is characterised i…
Magnetoabsorption spectra of bilayer graphene ribbons with Bernal stacking are studied by the Peierls-coupling tight-binding method. When the magnetic confinement prevails over the quantum confinement, low-energy spectra chiefly exhibit many Landau peaks, which are strongly modified by the inter-ribbon interactions an…
We report a one-step synthesis of magnetic helical mesostructured silica (MHMS) by self-assembly of an achiral surfactant, magnetic nanocrystals with stearic acid ligands and silicate. This core-shell structured material consists of an Fe(3)O(4) superparamagnetic nanocrystal core and a highly ordered periodic helical…
Abstract Calculations and detailed first principle and thermodynamic analyses have been performed to understand the formation mechanism of K 2 Ti 6 O 13 nanowires (NWs) by a hydrothermal reaction between bulk Na 2 Ti 3 O 7 crystals and a KOH solution. It is found that direct ion exchange between K + and Na + plus H +…
We report a scanning tunneling spectroscopy investigation of polycrystalline ${\text{SmFeAsO}}_{0.85}$ having a superconducting transition at 52 K. On large regions of the sample surface the tunneling spectra exhibited $\mathrm{V}$-shaped gap structures with no coherence peaks, indicating degraded surface properties.…
Remarkable photoluminescence enhancement (PLE) in submonolayer films of PbSe nanocrystals (NCs) upon continuous illumination was observed. The intensity increase from films on InP substrates was highest in vacuum, while for films on Si/SiO2 substrates the PLE was stronger in air. The magnitude of the PLE was found to…
Abstract BACKGROUND: To create a hydrophobic surface, a commonly used two‐step process is the formation of a rough surface and its subsequent modification with materials of low surface energy. Here, a new method for making a hydrophobic surface is proposed using emulsion copolymerization with a low‐surface‐energy fluo…
Here we present a microscopic theory of the electrocaloric effect in potassium dihydrogen phosphate, KH2PO4, based on Slater’s lattice model. The model reproduces the essential features of the experimentally observed behavior and also gives a remarkably accurate description of the electric field dependence of the elec…
Electronic eigenstates of a square graphene quantum dot (GQD) terminated by both zigzag and armchair edges are derived in the theoretical framework of the Dirac equation. We find that the Dirac equation can determine the eigenenergy spectrum of a GQD with high accuracy even if its size is reduced to a few nanometers.…
Abstract A method of manufacturing free‐standing, micrometer‐scale honeycomb polyetherimide films is reported for the first time. Films are manufactured with a dip‐coating technique under water‐assisted self‐assembly. It is shown that the addition of poly(organosilane/siloxane)s and poly(ethylene glycol) allows the fo…
We showed previously that poly(L-lactide)-grafted dextran could form biodegradable nanogels in water. In this paper, various properties of Dex-g-PLLA nanogels were compared with Dex-Chol (dextran-cholesterol conjugate) nanogels to investigate the effects of hydrophobic units. Dex-g-PLLA nanogels exhibited significantl…
Copper cubes: An oxygen-bridged heptacopper(II) structure, [Cu7(μ3-OH)6(μ3-X)2(D-pends)3], bearing D-penicillaminedisulfide (D-H2pends) as an auxiliary ligand was synthesized (see figure). This structure has a novel corner-sharing double-cubane framework without an intramolecular inversion center (i), which exhibits d…
Silicon filling: Silicon-doped Al44 superatoms form a cubic-primitive crystal lattice (see picture; • Al, • Si) in the cluster Si@Al56[N(dipp)SiMe3]12, which is prepared from a metastable AlCl solution and the silicon-containing ligand N(dipp)SiMe3 (dipp=2,6-iPr2C6H3). The central silicon atom has a strong influence o…
We report that Au nanoparticles, ligand-exchanged with a thiol ligand at the liquid-liquid interface, were dimerized using an N,N'-diisopropylcarbodiimide-mediated amide bond formation. This dimerization of 60 nm sized Au nanoparticles achieved 24% overall yield and was visually confirmed by transmission electron micr…
The sensitivity of spontaneous polarization to epitaxial strains is evaluated for several perovskite ferroelectrics using the nonlinear thermodynamic theory. For BaTiO3, PbTiO3, and Pb(Zr0.2Ti0.8)O3 epitaxial layers subjected to large compressive in-plane strains, the predicted relative polarization changes agree with…
Binding in a micelle: In the presence of CTABr micelles (see picture), the salophen–UO2 complex 1 binds fluoride in water with the highest affinity ever recorded for a neutral receptor (K≈ ca. 104 M−1). The receptor's location and its orientation within the micellar system are determined by PRE and NOE NMR experiments.
D. J. Bergman and L. J. Fel [J. Appl. Phys. 85, 8205 (1999)] calculated that in composites the thermoelectric power factor, the product of the square of the thermopower and the electrical conductivity, can be enhanced over that of the individual constituents, but the figure of merit cannot. This is demonstrated here e…
Vertically aligned double- and single-walled carbon nanotubes (DWNTs and SWNTs) were synthesized on a substrate at 590 °C by hot-filament chemical vapor deposition. An optimized combination of iron and aluminum layers as the catalyst resulted in iron particles ranging from 1-5 nm floating in an aluminum matrix after a…
One important parameter that quantifies the performance of ferromagnetic shape memory alloys is the blocking stress. To date, the low blocking levels (<5 MPa) impede the utilization of these alloys in applications where high work output is required. In this paper, we demonstrate an increase in the blocking stre…