Materials Literature
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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…
A simple, scalable, and cost-effective technique for controlling the growth density of ZnO nanorod arrays based on a layer-by-layer polyelectrolyte polymer film is demonstrated. The ZnO nanorods were synthesized using a low temperature (T = 90 °C), solution-based method. The density-control technique utilizes a polyme…
Plasmon-resonant nanoparticle-labeled immunoassays provide a simple, low-cost and effective way of detecting target molecules in solutions. The optical mechanisms behind their efficiency, however, have not been addressed until now. We present the first theoretical description of nanoparticle-labeled dot immunoassay an…
Negative index metamaterials are demonstrated based on metal-dielectric nanocomposites prepared using a versatile bottom-up nanofabrication approach. The method involves the incorporation of vertically aligned metal nanowires such as Au and Ag inside dielectric aluminum oxide nanotemplates. Optical absorbance measurem…
The incorporation of chromium on the strontium site of the perovskite lattice of SrTiO 3 ceramics and its influence on the structural, microstructural and low-frequency dielectric properties is studied in this work. Dense Sr 1−1.5 x Cr x TiO 3 ( x = 0, 0.0005, 0.0010, 0.0015) ceramics are prepared from powders obtaine…
Abstract Aliphatic dicarboxylic acid/aliphatic diol‐derived polyesters, poly(butylene succinate) and poly(butylene succinate/adipate), have been hydrolytically degraded in the melt in high‐temperature and high‐pressure water over a wide temperature range of 180–300 °C for periods of up to 30 min. The formation/decompo…
In this study the strong effect of surface density of stabilizers on the outcome of the typical cation replacement reaction in nanoparticles is demonstrated. The density of 2-aminoethanethiol coating determines the growth mode and morphology of the transformation products of CdTe nanoparticles induced by Ag cations. U…
Directing the self-assembly of colloidal particles into nanostructures is of great interest in nanotechnology. Here, reversible end-to-end assembly of gold nanorods (GNR) is induced by pH-dependent changes in the secondary conformation of a disulfide-modified poly(L-glutamic acid) (SSPLGA). The disulfide anchoring gro…
Operation of a carbon nanotube field effect transistor (FET) oscillator at a record frequency of 500 MHz is described. The FET was fabricated using a large parallel array of single-walled nanotubes grown by chemical vapor deposition on ST-quartz substrates. Matching of the gate capacitance with a series inductor enabl…
ZnO/Mg0.22Zn0.78O quantum wells were studied by excitation-intensity-dependent luminescence at 10 K. The samples were grown by laser molecular-beam epitaxy on ScAlMgO4 substrates to evaluate the well width dependence (1 to 10 nm) of exciton transition energies. Under weak excitation, the photoluminescence shows a quan…
Nonpolar (112¯0) ZnO films were grown on LaAlO3 (001) single crystal substrates at temperature from 300 to 750 °C by pulsed laser deposition method. The films were examined using x-ray diffraction, reflection high energy electron diffraction, and photoluminescence measurements for the crystallinity. The surface morpho…