Materials Literature
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Abstract Nanocomposites of chitosan and nanoclays (MMT‐Na + and Cloisite 30B) were prepared by solvent casting. The structural properties, thermal behaviors, and mechanical properties were characterized using X‐ray diffraction (XRD), transmission electron microscopy (TEM), atomic force microscopy, differential scannin…
We present results of an ab initio density-functional theory study of three bismuth-based multiferroics, $\mathrm{Bi}\mathrm{Fe}{\mathrm{O}}_{3}$, ${\mathrm{Bi}}_{2}\mathrm{Fe}\mathrm{Cr}{\mathrm{O}}_{6}$, and $\mathrm{Bi}\mathrm{Cr}{\mathrm{O}}_{3}$. We disuss differences in the crystal and electronic structure of th…
Polyaniline nanofibers are shown to form spontaneously during the chemical oxidative polymerization of aniline. The nanofibrillar morphology does not require any template or surfactant, and appears to be intrinsic to polyaniline synthesized in water. Two approaches--interfacial polymerization and rapidly-mixed reactio…
The cover picture illustrates redox‐promoted self‐assembly of an eight‐residue cyclic D , L ‐α‐peptide bearing four 1,4,5,8‐naphthalenetetracarboxylic diimide side chains into electronically delocalized peptide nanotubes hundreds of nanometers in length. The background picture was derived from an atomic force microsco…
We show that electron wave functions in a quasi-two-dimensional conductor in a parallel magnetic field are always localized on conducting layers. In particular, wave functions and the electron spectrum in a quantum limit, where the sizes of quasiclassical electron orbits are of the order of nanoscale distances between…
We have measured the decay of local conductance in single-wall carbon nanotubes directly using conductance imaging atomic force microscopy. The decay lengths were in the range from $190\phantom{\rule{0.3em}{0ex}}\mathrm{nm}$ to well over $3\phantom{\rule{0.3em}{0ex}}\ensuremath{\mu}\mathrm{m}$. There are strong indica…
The large tunneling anisotropic magnetoresistance of a ferromagnetic p++-(Ga,Mn)As∕n+-GaAs Zener-Esaki diode is shown in a perpendicular magnetic field over a large temperature and voltage range. Under an applied bias, the tunnel junction transparency is modified, allowing one to continuously tune anisotropic transpor…
Complexation of 3-nitronyl-nitroxide-substituted pyrazolate (pzNN) and 3-imino-nitroxide-substituted pyrazolate (pzIN) with nickel(II) gave [Ni3(pzNN)6] and [Ni3(pzIN)6], respectively. They were practically isomorphous and characterized as a linear trinuclear structure with neighboring nickel ions triply bridged by py…
Compact expressions are derived for the maximum operating frequency of carbon nanotube field-effect transistors. The expressions are shown to be applicable over wide ranges of physical properties, parasitic resistances, and gate biases. The utility of the expressions is demonstrated by their prompting of a conservativ…
In this work, the fabrication technique for micropatterns of a colloidal assembly on a gold-patterned electrode surface using electrophoretic deposition is described. It was found that the micropatterns of a colloidal assembly were preferentially deposited onto the gold pattern region, when a gold patterned indium tin…
Structural modification of nanosized diamonds (ND) irradiated with 100 keV 15 N ions for various doses was investigated using transmission electron microscopy (TEM) and Raman spectroscopy. Raman active modes showing a long-range order of diamond were observed for samples dosed with 10 15 cm −2 . However, the formation…
Molecularself-assembly of peptide systems is emerging as a new approach in protein engineering, study of protein folding, and protein-protein interaction as well as nanotechnology, polymer science, nanomaterials science and engineering. Self-assembling peptide systems lie at the interface of all these fields.Many self…
A novel dynamic soft template solution route has been developed for the preparation of micrometre-sized In 2 S 3 half-shells, assembled by fine nanoparticles. This novel half-shell nanostructure was characterized by electron microscopes, x-ray diffraction (XRD), x-ray photoelectron (XPS), and optical spectroscopes. Th…
In this paper we demonstrate a modified focused ion beam (FIB) milling approach integrated with self-alignment to synthesize ferroelectric nanostructures. Nanoscale holes ranging from 500 nm down to 100 nm in diameter are created on 'spun-on' amorphous TiO2 on Pt/TiO2/Si using FIB milling. It is found that spin-coatin…
Abstract Summary: In this paper, high power ultrasound was introduced into polystyrene (PS)/ethylene‐propylene diene monomer (EPDM) (80/20) blend melts during extrusion. The structure and properties of PS/EPDM blends treated ultrasonically, such as their mechanical properties, phase morphology, dynamic rheological beh…
Abstract Summary: A new method to prepare maleic anhydride grafted poly(propylene) (MAPP) was developed successfully. The grafting reaction of maleic anhydride (MA) onto poly(propylene) (PP) was performed with the aid of ball‐milling, and the grafting mechanism was proposed based on the experimental results. MAPP was…
Abstract The reversible photochemical ion chelation of the newly synthesised substituted N , N′ ‐bis(spiro[1‐benzopyran‐2,2′‐indolyl])diazacrown systems 15a – c and the subsequent molecular electronic control of this process using appropriately placed substituent groups on the spiro‐benzopyran skeleton is reported. Th…
Abstract Summary: Hyperbranched aliphatic copolyesters have been prepared by the copolymerization of ε ‐caprolactone and 2,2‐bis(hydroxymethyl)butyric acid (AB 2 ‐monomer), catalyzed by (i) HfCl 4 (THF) 2 and (ii) diphenylammonium trifluoromethanesulfonate (DPAT), respectively. In both cases, copolymerization by combi…
Abstract Summary: A novel addition‐type liquid silicone rubber (SR)/organic montmorillonite (OMMT) nanocomposite has been synthesized. N , N ‐Di(2‐hydroxyethyl)‐ N ‐dodecyl‐ N ‐methylammonium chloride was used as an intercalation agent to treat Na + ‐montmorillonite and form a novel kind of OMMT. Three types of SR/OMM…
Abstract Summary: Conductive nanotubes were fabricated by the alternate adsorption of negatively charged polypyrrole (PPy) and positively charged poly(allylamine hydrochloride) (PAH) onto the inner pores of polycarbonate templates. Nanotubes are obtained by the subsequently removal of the template. Using several micro…