Materials Literature
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We have demonstrated Schottky diodes using semiconducting single-walled nanotubes (s-SWNTs) with titanium Schottky and platinum Ohmic contacts for high-frequency applications. The diodes are fabricated using angled evaporation of dissimilar metal contacts over an s-SWNT. The devices demonstrate rectifying behavior wit…
Abstract Well‐dispersed multiwalled carbon nanotube (MWNT)/polystyrene nanocomposites have been prepared via melt extrusion, using trialkylimidazolium tetrafluoroborate‐compatibilized MWNTs. Quantification of the improvement is realized via transmission electron microscopy and laser scanning confocal microscopy image…
Abstract This paper describes a totally electrochemical process for the fabrication and functionalization of high‐surface‐area, nanoporous gold films. The fabrication process involves the electrodeposition of a binary gold–zinc alloy at gold wires, followed by subsequent electrochemical dealloying of the less noble co…
The dispersion of polymer-covered gold nanoparticles in high molecular weight (MW) polymer matrixes is reported. Complete particle dispersion was achieved for PS125-Au in the polystyrene (PS) matrixes studied (up to and including Mn = 80 000 g/mol). PS19-Au, on the other hand, exhibits complete dispersion in a low MW…
Abstract Intercrystalline molecular connections in semicrystalline polymers have been the subject of numerous discussions and controversies. Nevertheless, there is one point of agreement: such intercrystalline tie molecules have a prime role in the mechanical and use properties of the materials, notably the resistance…
The substitution of one metal ion in a Cr-based molecular ring with dominant antiferromagnetic couplings allows the engineering of its level structure and ground-state degeneracy. Here we characterize a Cr7Ni molecular ring by means of low-temperature specific-heat and torque-magnetometry measurements, thus determinin…
This paper describes the adsorption of electroactive methylene blue (MB) dye onto single-walled carbon nanotubes (SWNTs) to form an electrochemically functional nanostructure and its layered nanocomposite. UV−visible and FT-IR spectroscopy and electrochemistry used for characterization of the MB adsorption onto SWNTs…
Abstract Nanocomposites based on semi‐crystalline poly(vinyl alcohol) (PVA) and well‐dispersed chemically functionalized single‐walled carbon nanotubes are combined through simple mixing. The interaction between the nanotubes and the polymer matrix is studied using optical and thermal methods. Significant enhancement…
By a theoretical model consisting of Su-Schrieffer-Heeger Hamiltonian and a Hubbard term, the ground-state and soliton excitation of an organic ferromagnetic polymer $m$-polydiphenylcarbene are investigated. As the electron-phonon coupling $\ensuremath{\lambda}$ increases, there is a structure phase transition from a…
Abstract Commercial chitosans were subjected to controlled acid hydrolysis and their degrees of deacetylation (DD), molecular size and rheological flow profiles determined (pre‐ and post‐hydrolysis) by 1 H‐NMR spectroscopy, high‐performance size‐exclusion chromatography and rheometry, respectively. Hydrolysis resulted…
Protein nanocrystallography has recently been introduced as a unique nanotechnology-based approach to forming stable protein crystals and to characterize them down to atomic resolution. In particular, a protein nanostuctured template appears to be capable of stimulating nucleation and crystal growth of so far unsolved…
Pressure is a non-invasive physical parameter that can be used to control and influence protein crystallization. It is also found that protein crystals of superior quality can be produced in gel. Here, a novel crystallization strategy combining hydrostatic pressure and agarose gel is described. Comparative experiments…
Abstract The effects of ultrasonic irradiation on the rheology, structure, and properties of PP/inorganic filler composites were studied. Scanning electron microscopy showed that ultrasound increased the orientation degrees of acicular fillers to the flow direction. WAXD indicated that ultrasound vibration induced she…
Selective absorption of isoprene from n -pentane mixtures was performed via reversible π complexation with an aqueous solution of copper(I) nitrate, which was prepared by the disproportionation reaction between copper powder and cupric nitrate trihydrate [Cu(NO 3 ) 2 ·3H 2 O] in H 2 O in the presence of pyridine and n…
Knowledge of protein crystal perfection in theory and practice is reviewed. X-ray methods of assessing perfection such as mosaicity, topography and reciprocal-space mapping are described. X-ray diffraction physics applications of protein crystals such as in Laue geometry, the large-angle oscillation technique and form…
The present report is dedicated to a systematic comparison of crystal structures produced by the nanobiofilm template method and by the classical hanging-drop vapour-diffusion method. Crystals grown by the innovative nanostructured template method appear indeed radiation-resistant even in the presence of a third-gener…
A dynamic seeding method that is different from the conventional method of seeding drops that have been equilibrated is described. The method basically consists of two steps. Firstly, microseeding was used in association with adjustment of the seeding-drop components, including buffer, additive and concentrations of t…
We investigate the electron transport in multiply connected metallic carbon nanotubes within the Landauer-B\"uttiker formalism. Quasibound states coupled to the incident ${\ensuremath{\pi}}^{*}$ states give rise to energy levels of different widths depending on the coupling strength. In particular, donorlike states or…
This paper concerns the development of an innovative LiCrO 2 catalyst (synthesis, characterization, mechanistic analysis, and aging). This catalyst already showed appreciable activity at 300 °C toward the catalytic combustion of soot even under loose contact conditions. Furthermore, its limited sensitivity to hydrothe…
Ceria (CeO 2 )‐doped alumina (Al 2 O 3 ) composite nano‐particles were synthesized using sucrose as a chelating agent and template material. As‐synthesized powders were characterized using X‐ray diffraction technique for their phase analysis, BET surface area analyzer for specific average surface area, and transmissio…