Materials Literature
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Carbon/gold composite nanotubes as well as gold nanorods were synthesized by the impregnation of porous alumina with diluted hydrogen tetrachloroaurate (HAuCl 4 )/acetone solutions and subsequent thermolysis at moderate temperatures. Gold(III) is reduced, whereas carbon provided by the solvent acetone is oxidized. No…
Synthesis and magnetic studies of a new class of organic spin clusters, possessing alternating connectivity of unequal spins, are described. Polyarylmethyl polyether precursors to the spin clusters, with linear and branched connectivity between calix[4]arene-based macrocycles, are prepared via modular, multistep synth…
Polyhydroxyalkanoates (PHAs) are biodegradable polyesters that have a wide variety of physical properties dependent on the lengths of the pendant groups of the monomer units in the polymer. PHAs composed of mostly short-chain-length (SCL) monomers are often stiff and brittle, whereas PHAs composed of mostly medium-cha…
In this paper a method for fabricating nanostructured polymeric surfaces with contrasted chemical functionality is presented. First, a polymer film of acrylic acid (PAA) is deposited by plasma enhanced chemical vapor deposition. It is covered by a monolayer of particles in the 500 nm range. Then oxygen plasma etching…
The interaction of NH 3 and NO 2 with heterogeneous bundles of carbon single-walled nanotubes (SWNTs) has been studied using FTIR spectroscopy and temperature-programmed desorption (TPD). Both NH 3 and NO 2 adsorb at room temperature, and the interaction results in strong shifts of the vibrational modes of the molecul…
In situ low-energy electron microscopy was used to study interlayer mass transport kinetics during annealing of three-dimensional (3D) TiN(111) mounds, consisting of stacked 2D islands, at temperatures T between 1550 and 1700 K. At each T, the islands decay at a constant rate, irrespective of their initial position in…
Dyson orbitals play an important role in understanding quasi-particle effects in the correlated ground state of a many-particle system and are relevant for describing the Compton scattering cross section beyond the frameworks of the impulse approximation (IA) and the independent particle model (IPM). Here we discuss c…
The Kirchhoff's theory for thin, inextensible, elastic rods with nonhomogeneous cross section is studied. The Young's and shear moduli of the rod are considered to vary radially, and it is shown that an analytical solution for the constitutive relations can be obtained for circular cross section and constant Poisson's…
Dilute granular flows are routinely described by collisional kinetic theory, but dense flows require a fundamentally different approach, due to long-lasting, many-body contacts. In the case of silo drainage, many continuum models have been developed for the mean flow, but no realistic statistical theory is available.…
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…