Materials Literature
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We report experimental and theoretical studies on the plasmon resonances of finite one-dimensional chains of Au nanoparticles excited by evanescent light waves with polarization parallel to the chains. The experimental results show that the plasmon resonance peak wavelengths of these finite 1D chains are significantly…
It is essential to put individual, free-standing nanowires onto insulating substrates and integrate them to useful devices. Here we report a strategy for fabrication of conducting polymer nanowires on thermally oxidized Si surfaces by use of DNA as templates. The direct use of stretched and immobilized DNA strands as…
The lipophilic CdSe quantum dot (QD) coated with trioctylphosphine oxide (TOPOQD) can be extracted from chloroform into water upon interaction with macrocyclic glycocluster amphiphile 1. The QD-conjugated and highly fluorescent sugar ball of a size of 15 nm (TOPOQD1) thus solubilized in water readily invades Hela cell…
Abstract Polyamide‐12 was blended with butyl rubber, bromobutyl rubber, and chlorobutyl rubber with and without a sulfur curing system. Mechanical properties for dynamically vulcanized blends generally exceed those made with no vulcanization. Chlorobutyl‐containing blends prepared by dynamic vulcanization have higher…
Substituted styrenes with linear alkyl substituents (C 6 to C 12 ) at the para position on the ring were synthesized and polymerized using the (Me) 5 CpTi(OMe) 3 /MAO catalytic system. Increased polymerization activities were observed for longer alkyl group (>C 6 ) substituted styrenes; all resulting polymers were hig…
The electron-energy-loss spectra of NiO have been calculated by the ab initio full-potential linearized augmented plane-wave method within the $\mathrm{L}\mathrm{D}\mathrm{A}+U$ approximation and compared with experimental spectra obtained in transmission electron microscopy. The results of standard calculation scheme…
A new family of polymer, namely hyperbranched thermosetting poly(imide−ester) (HBPIE), was successfully prepared by the esterification reaction between a hyperbranched oligoimide terminated with carboxylic end groups (−COOH) and a hyperbranched oligoester terminated with acetoxy end groups (−OAc). The hyperbranched ol…
A multipole expansion method is developed to determine the elastic field of dislocation loop ensembles of arbitrary geometric complexity. The method results in reduction of the severe computational requirements in large-scale dislocation dynamics (DD) computer simulations without an artificial cutoff on the interactio…
We have performed low-temperature scanning tunneling microscopy measurements on single-wall carbon nanotubes that are freely suspended over a trench. The nanotubes were grown by chemical vapor deposition on a Pt substrate with predefined trenches etched into it. Atomic resolution was obtained on the freestanding porti…
Introductory biochemistry texts often note that the fold of a protein is completely defined when the dihedral angles phi and psi are known for each amino acid. This assertion was examined with torsion angle dynamics and simulated annealing (TAD/SA) calculations of protein G using only dihedral angle restraints. When a…
Abstract Effects of a maleated triblock copolymer of styrene–(ethylene‐ co ‐butene)–styrene (SEBS‐ g ‐MA) on compatibilization and mechanical properties of nylon‐12,12/nylon‐6 blends were investigated. The results showed that addition of SEBS‐ g ‐MA could improve the compatibility between nylon‐12,12 and nylon‐6. Nylo…
The relationship between the structure and mechanical properties of sputter-deposited boron carbide films was investigated. Changes in the structure induced by annealing were characterized in terms of chemical composition, chemical bonding, and concentrations of defects and trapped impurities. The creation of interico…
Red and red/blue cathodoluminescence in the temperature range 12 to 300 K was obtained from single- and polycrystal cubic boron nitride bulk samples implanted with europium and annealed under high-temperature, high-pressure conditions. All observed radiative intra-4f electron transitions of Eu3+ can be assigned to tra…
Epitaxial films of the full Heusler alloy Co2MnAl were grown on GaAs substrates by molecular-beam epitaxy. The close lattice matching and similar structure to GaAs make this material a good candidate for a spin injector. Magnetization measurements reveal complex ferromagnetic transitions near the Curie point at TC≃800…
Surface force microscopy was used to examine the dynamic indentation response of austenitic titanium–nickel (TiNi) films sputtered on oxidized silicon substrates. Results demonstrate the significance of indentation cycles, time at maximum contact load, and loading/unloading rate on the nanoscale pseudoelastic behavior…
An influence of a high-field annealing on the magnetic properties was investigated in sintered Nd–Fe–B magnets. When the sample B, containing 0.32 at. % Al, was annealed at Ta=550 °C under a magnetic field of Ha=140 kOe and then cooled without field, the coercivity Hc increased by 25% with respect to the control sampl…
The surface chemistry of coke precursors on spent fluid catalytic cracking catalysts during the oxidative regeneration process was investigated by temperature-programmed desorption and temperature-programmed oxidation experiments and IR spectroscopy. NH 3 and HCN are formed via cracking and hydrolysis reaction of coke…
Aluminum was incorporated into the mesoporous framework of ethane−silica by one-pot condensation of Al(O i Pr) 3 with 1,2-bis(trimethoxysilyl)ethane using octadecyltrimethylammonium chloride as surfactant. Powder X-ray diffraction patterns, nitrogen sorption analysis, and TEM results reveal the formation of an ordered…
In this article we report on the conductance of bundles of single-wall carbon nanotubes as a function of temperature and bias voltage. We focus on the nonlinearity in the IV curves near zero bias, i.e., a pronounced conductance dip. While we observe that all temperature dependent data scale onto a single curve, we als…
A novel method for the purification of single-walled and multiwalled carbon nanotubes is described. The method involves acid washing followed by hydrogen treatment in the 700−1000 °C range. While acid washing dissolves the metal particles, the hydrogen treatment removes amorphous carbon as well as the carbon coating o…