Materials Literature
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Brillouin and Raman spectroscopy were performed on B2O3 glass compressed to 57 GPa at 273 K. Upon compression the sound velocities increase smoothly and the boroxol ring Raman mode vanishes by 11 GPa. Upon decompression the sound velocities follow a different path and at 3 GPa a discontinuity of 3 km/s in V(p) and 2 k…
This work addresses thermodynamic and mechanical properties of styrene block copolymer (SBC) self-adhesive materials. Mixtures of polystyrene- block -polyisoprene- block -polystyrene (SIS triblock) copolymers with resin and their blends with polystyrene- block -polyisoprene (SI diblock) copolymers were investigated ex…
Epitaxial relationships between the surfaces of inorganic and bioorganic crystals can be an important factor in crystal nucleation and growth processes in a variety of biological environments. Crystalline cholesterol monohydrate (ChM), a constituent of both gallstone and atherosclerotic plaques, is often found in asso…
Charge state-resolved time-of-flight spectra were collected for 2.0 keV 23Na+ scattered from Au nanoclusters deposited on TiO2(110). The neutral fraction of Na scattered from metallic Au is low ( approximately 3%), but it is surprisingly high (up to 50%) for small clusters. The results demonstrate that alkali ions cou…
Future generation automobiles are being developed on fuel cell as the principal source of power generation in automobiles. Automobiles have fast changing load requirements like acceleration or sudden uphill, thus drastically increasing load torque. Fuel cell cannot respond to these fast changing load due to it's slow…
[reaction: see text] The enzymatic degradation of starch can be monitored electronically using single-walled carbon nanotubes (SWNTs) as semiconducting probes in field-effect transistors (FETs). Incubation of these devices in aqueous buffer solutions of amyloglucosidase (AMG) results in the removal of the starch from…
We have studied the complexation process taking place in cationic liposomes in the presence of anionic polyelectrolytes, in the polyion concentration range from the dilute to the concentrated regime, by combining dynamic light scattering and transmission electron microscopy techniques. We employed as the cationic lipi…
Abstract Pentacoordinate planar nonmetals (PPNs) centered in perfect pentagonal hydrocopper complexes Cu 5 H 5 X (X = B, C, N, O), as determined by density functional theory methods, are presented in this communication. The results obtained in this work complete the hypercoordinate planar carbon series with high symme…
A large variety of amphiphilic polylactide-grafted dextrans has been synthesized with controlled architecture through a three-step procedure: partial protection of the dextran hydroxyl groups by silylation; ring-opening polymerization of D, L -lactide initiated from remaining hydroxyl groups on partially silylated dex…
The tubulization process of amorphous carbon nanopillars was observed in situ by transmis-sion electron microscopy. Amorphous carbon nanopillars were transformed into graphitic tubules by annealing at 650-900 degrees C in the presence of iron nanoparticles. A molten catalyst nanoparticle penetrated an amorphous carbon…
Supercrystals of uniform nanorods and ordered assemblies of nanowires are presented. We describe a convenient method to produce highly uniform and extremely thin ZnS nanorods and nanowires. Because of their uniformity, they spontaneously assemble into crystalline (nanorods), as well as parallel and crossed (nanowire)…
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We successfully functionalized single-walled carbon nanotubes (SWNTs) through a microwave discharge of ammonia. Evidence is supplied through Fourier transform infrared (FTIR) spectroscopy with band assignment aided by computational modeling. X-ray photoelectron spectroscopy (XPS) and Raman spectroscopy results also pr…
Novel magnesium matrix composites reinforced with carbon nanotubes have been processed by powder metallurgy. Blends of metal powders and multi-wall carbon nanotubes were compacted by uniaxial hot pressing followed by hot isostatic pressing. A uniform dispersion of nanotubes in the metal matrix was obtained. A coating…
Abstract Two new diamines, 2,4‐diaminotriphenylamine ( 3 ) and N ‐(2,4‐diaminophenyl)carbazole ( 4 ), were synthesized via the cesium fluoride‐mediated aromatic substitution reactions of 1‐fluoro‐2,4‐dinitrobenzene with diphenylamine and carbazole, followed by palladium‐catalyzed hydrazine reduction. Amorphous and sol…
Abstract The reaction of Ni(NO 3 ) 2 ·6H 2 O with H 3 thme (trihydroxymethylethane) in the presence of NaOMe leads to a tetranuclear Ni 4 complex with a cubane‐like structure. Intramolecular ferromagnetic interactions [ J = 10 cm −1 based on H = − J ( S 1 · S 2 + S 1 · S 3 + S 1 · S 4 + S 2 · S 3 + S 2 · S 4 + S 3 · S…
Abstract Microstructures with hollow interiors, such as microspheres, microcrocks, microbowls, and micropumpkins, were prepared through the direct electrochemical oxidation of pyrrole in an aqueous solution of poly(styrene sulfonic acid) (PSSA). Scanning electron microscopy demonstrated that the microstructures posses…
A novel approach is reported for cell patterning based on addressable microheaters and a poly(N-isopropyl acrylamide) (pNIPAM) themoresponsive coating. This thermoresponsive coating is created by a radio frequency NIPAM plasma and is denoted as plasma polymerized NIPAM (ppNIPAM). Films of ppNIPAM with a good retention…
A novel functional copolymer was synthesized by modifying poly( N -isopropylacrylamide) with spirobenzopyran. The phase transition properties of the aqueous solution of this copolymer exhibited a logic-gate response to the light irradiation and to increased temperature, which has three different modes depending on the…
Two mechanisms that drive metal-to-semiconductor transitions in single-walled carbon nanotubes are theoretically analyzed through a simple tight-binding model. By considering simple structural trends, the results demonstrate that metal-to-semiconductor transitions can be induced more readily in metallic zigzag nanotub…