Materials Literature
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Abstract We study the effect of Ar + ‐irradiation on electrical transport in an individual single wall carbon nanotube (SWNT), a thin SWNT network and a thick SWNT film. The damage to SWNT structure induced by Ar + ‐irradiation is characterized by Raman spectroscopy. The electrical conductance both in an individual SW…
BaTiO3-CoFe2O4 composites synthesized by the ceramic method showed a magnetoelectric effect. The CoFe2O4 powders were synthesized by coprecipitation and mixed with Aldrich reactive quality BaTiO3 powders with particle size < 2 μm. The coupling of the magnetostrictive and the piezoelectric phases via elastic deformatio…
The luminescent infrared transitions in Nd3+ can be activated via a transfer mechanism from amorphous silicon nanoclusters. The Nd photoluminescence (PL) has some unusual characteristics, including a weak temperature dependence of the PL intensity. The data are explained using a simple rate equation model which enable…
Abstract Polypropylene/wood flour composites were prepared by melt compounding. To improve their mechanical performance, the matrix polypropylene was modified with a specific nucleation agent based on an amide of dicarboxylic acid, which promotes crystallization predominantly in the β‐phase. The resulting material was…
Abstract Nanoscaled materials, such as single walled carbon nanotubes (SWCNT), are increasingly used in a wide range of areas because of their unique characteristics. Presently, it is not clear to what extent these materials have an adverse effect if they are taken up by humans. Because of their dimensions and persist…
Electric transport through nanometric SrTiO3 layers on La0.67Ca0.33MnO3(001) epitaxial thin film electrodes has been investigated by conducting atomic force microscopy. Electrical resistance maps, recorded at various biases, of samples with barriers having different thicknesses were used to evaluate the barrier height…
There is strong evidence that the spherical carbon particles composed of graphite carbon onions of ca. 10nm are grown to micron size under the conditions of a heated Si (100) substrate surface exposed to irradiation by a CH4∕Ar plasma. Furthermore, it is described that these carbon particles of micron size are spheric…
Abstract Carbon nanotubes have been demonstrated to behave piezoresistively, i.e. to change resistance dramatically upon elastic deformation. This effect can be utilized for strain sensing, pressure sensing and for nano electromechanical transducers in microsystems. Here we report on a bottom‐up method for integrating…
Abstract Polyphosphazene polyelectrolytes containing various amounts of hydrophobic fluorinated moieties and ionic carboxylic acid groups were synthesized. Polymer compositions and molecular weights were characterized by NMR and gel permeation chromatography. Interestingly, poly[(carboxylatophenoxy)(trifluoroethoxy)ph…
Abstract Summary: Cationic water‐soluble dendritic poly(fluorene)s with positively charged amines on the exterior (PFP‐G 0–2 ) can be prepared by a macromonomer (generation‐by‐generation) approach. The charge densities of PFP‐G 0–2 can control their distances to DNA by electrostatic interactions. The PFP‐G 2 with high…
Abstract Three kinds of cyclic anhydrides, which stand for aliphatic anhydride, aromatic anhydride, and anhydride containing double bond: succinic anhydride, phthalic anhydride, and maleic anhydride have been copolymerized with propylene oxide and low molecular weight polyoxypropylenediol via ring‐opening copolymeriza…
Abstract Summary: The 1 H NMR and 13 C NMR spectra of hyperbranched polyphenylenes synthesised from AB 2 , (AB 2 + AB) and (A 2 + B 3 ) monomers (A: ethynyl group; B: cyclopentadienonyl group) were analysed with respect to the characteristic substructures of these polymers. The broad and overlapping NMR spectra were s…
The full-potential LAPW method in the local spin-density approximation (LSDA) is applied to the theoretical search for new magnetic semimetals on the basis of a nonmagnetic SrSnO 3 semiconductor doped with magnetic ions M = Mn, Fe, Co. It is found that, in contrast to Sr 2 SnMnO 6 (a ferromagnetic semiconductor) and S…
Abstract The 13 C NMR spectra of a carbon nanofoam sample, exhibiting a peak in the ZFC magnetic susceptibility, show a single 13 C line at room temperature and a two peak structure at 100 K. The splitting and the NMR shifts are however much too small to be associated with true ferromagnetism as for instance observed…
We have studied the hexatic-B-smectic-A (HexB-SmA) transition in n -hexyl- 4'-n -pentyloxybiphenyl-4-carboxylate (65OBC) by means of a high-resolution ac photopyroelectric (PPE) calorimetric technique. A procedure for the interpretation of the PPE data, which allows the detection of an internal heating source due to s…
The tellurium-containing cationic type-I clathrate Ge30P16Te8 was synthesized and its thermoelectric properties were investigated. This clathrate showed a p-type conductivity, while most of the clathrates are n type. The Ge30P16Te8 clathrate had a band gap energy of 0.62eV and a room temperature thermal conductivity o…
We report that the conductance of macroscopic multiwall nanotube (MWNT) bundles under pressure shows power laws in temperature and voltage, as corresponding to a network of bulk-bulk connected Tomonaga-Luttinger liquids (LLs). Contrary to individual MWNTs, where the observed power laws are attributed to Coulomb blocka…
A transition of film surface morphology between wrinkling and surface relief during heating/cooling is reported for a sputtered TiNiCu thin film shape memory alloy. The mechanisms for this transition are discussed based on film stress evolution. During annealing surface wrinkling occurs to relieve compressive stress i…
The stress required to force a dislocation to glide through a random environment of obstacles depends on both the dislocation length and the glide distance because of the statistical nature of the obstacle configurations. In order to study this finite size effect, we employ a line tension model in conjunction with an…
Abstract Summary: A new optically active photochromic polymethacrylate containing the carbazole moiety, deriving from the chiral monomer ( S )‐(4‐cyanophenyl)‐(3‐{9‐[2‐(2‐methacryloyloxypropanoyloxy)ethyl]carbazolyl})diazene [( S )‐ MLECA ] has been prepared and fully characterized with the aim to obtain a multifuncti…