Materials Literature
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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…
The effects of cadmium stress on growth, morphology, and protein expression were investigated in Rhodobacter capsulatus B10 using two-dimensional polyacrylamide gel electrophoresis and a scanning electron microscope with an energy dispersive X-ray spectrometer. The bacterium grew in the presence of 150 microM CdCl2 an…
We present a kinetic transport model for hot electrons and hot phonons in metallic single-wall carbon nanotubes. The transport model is based on a coupled system of Boltzmann equations of linearly dispersive electrons and optical phonons. An efficient and accurate deterministic numerical scheme is developed to solve t…
Abstract Summary: A highly fluorescent photochromic polymer, poly‐BTFO4, was prepared. The fluorescence quantum yield of the poly‐BTFO4 was six times higher than that of BTFO4. Fatigue resistance of the polymer at its photostationary state was significantly enhanced compared with that of BTFO4. Importantly, the poly‐B…
Abstract Hindered piperidine amine (HPA) and tertiary amine (TA) were introduced into hydrolytic polymerization of caprolactam, and polyamide 6 (PA 6) modified by additives [HPA/TA = 1 : 1 (w/w)] was obtained. The effects of additives on the melt, light, and heat stability of PA 6 were studied. The results showed that…
The O K-edge pre-edge structure in the x-ray absorption spectra of high quality La2∕3Ca1∕3MnO3 epitaxial thin films grown on top of (001) SrTiO3 and NdGaO3 substrates is analyzed as a function of structural strain and temperature. A clear correlation between temperature dependent spectral changes and the structural st…
The transmission and reflection scattering parameters of arrays of single-wall carbon nanotubes (SWCNTs) directly assembled onto coplanar waveguides (CPWs) have been measured from 0.01to50GHz at room temperature. Typical arrays consisted of roughly ∼103 SWCNTs aligned parallel to the electric field polarization of the…
Abstract Hexamethyldisilazane was used as the starting material to synthesize N , N ′‐bis(hydroxydiphenylsilanyl)tetraphenylcyclodisilazane (BHPTPC). By condensation polymerization of BHPTPC with α,ω‐bis(dialkylamino)dimethylsiloxane, a series of alternate copolymers containing N , N ′‐bis(diphenylsilyl)tetraphenylcyc…
Abstract A soft computing approach to model the structure–property relations of nonwoven fabrics for filtration use is developed. Because the number of samples is very limited, the artificial neural network model to be established must be a small‐scale one. Consequently, this soft computing approach includes two stage…
Abstract Summary: A series of new poly(aryl ether ketone‐benzoxazole)s (PAEKBOs) with hexafluoroisopropylidene moieties were synthesized directly by the aromatic nucleophilic polycondensation of 2,2′‐bi[2‐(4‐fluorophenyl)benzoxazol‐6‐yl]hexafluoropropane(6F‐BO), 4,4′‐difluorobenzophenone (DFBP) and 4,4′‐(hexafluoroiso…