Materials Literature
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A nonlinear optical polymer , which is thermoreversibly crosslinkable (see Figure), has been developed to overcome the nonlinearity–stability trade‐off in poled polymers. High poling efficiency has been achieved after controlled, mild lattice hardening via the Diels–Alder crosslinking reaction. The resulting material…
Eleven different peptide-core dendritic macromolecules, each having a [G2] poly(benzyl ether) dendritic wedge (Den) at the peptide side chain, N-terminal, or C-terminal, were synthesized, and their potentials as macromolecular organic gelators were investigated in MeCN. Among these candidates, side-chain-dendronized B…
By utilizing highly aligned graphitic nanotubes embedded with gold nanoparticles an efficient field‐emission device can be constructed. These have been synthesized by first preparing composite nanotubes consisting of poly( p ‐phenylenevinylene) and Au nanoparticles by chemical vapor deposition polymerization, followed…
The structural/morphological and oxygen handling properties of two high-surface-area Ce−Tb mixed oxides prepared by a microemulsion method with Ce/Tb atomic ratios of ca. 4 and 1 have been analyzed in a multitechnique study (HREM, XEDS, XRD, Raman, XPS, O 2 - -EPR, adsorbed methoxy IR, and C 18 O 2 isotopic exchange).…
A variety of novel BaCrO 4 nanostructures , such as nanobelts and their tree‐like superstructures (see Figure), have been synthesized in a unique catanionic reverse micelle system by simply changing the mixing ratio between the anionic and cationic surfactants. This synthetic method provides a simple, novel method for…
Abstract Electrically conducting nanocomposites of bismuth metal and insulating ceramic phases of SiO 2 and MgO were generated via high‐energy ball milling for 24 h using zirconia milling media. The resulting nanocomposites contain Bi nanoparticles with sizes down to 5 nm in diameter. The morphology is a strong functi…
Time-resolved photoluminescence measurements were used to study the passivation kinetics of luminescence-quenching defects, associated with Si nanocrystals in ${\mathrm{SiO}}_{2},$ during isothermal and isochronal annealing in molecular hydrogen. The passivation of these defects was modeled using the generalized simpl…
Stable endothelialization of a tissue-engineered heart valve is essential for proper valve function, although adhesive characteristics of the native valve endothelial cell (VEC) have rarely been explored. This research evaluated VEC adhesive qualities and attempted to enhance VEC growth on the biopolymer chitosan, a n…
Abstract Aqueous solutions of hydroxypropyl cellulose with cholesteric superstructures were employed as templates in a silica nanocasting process, and the resulting pore structures were characterized by polarization microscopy, circular dichroism, X‐ray scattering, transmission electron microscopy, and sorption measur…
Unusually high magnetic hardness , characterized by a coercive field of 2 T at 2 K, has been observed for 12 nm particles of CoFe 2 O 4 (15%) in amorphous silica prepared by the sol–gel technique and sintered at 1000 °C. Field‐ and temperature‐dependence magnetization data (see Figure) for these particles and those of…
A nanometer‐thick BaTiO 3 coating layer has been prepared on spherical Ni. The BaTiO 3 coating effectively retards the low‐temperature sintering between Ni particles and improves the resistance against Ni oxidation. This technology provides a useful tool to fabricate highly integrated multilayer ceramic capacitors (ML…
Abstract The peak of the luminescence spectrum of zinc oxide (ZnO) is usually observed above 500 nm (yellow region). By in‐situ growth of ZnO nanoparticles in a poly(ethylene glycol) (PEG) matrix, we have succeeded in producing ZnO/polymer composites with stable luminescence peaks down to 465 nm (blue region). The unb…
Hydrogen bonding can be used to significantly enforce the intra‐columnar stacking order in discotic mesogens. The ordered hexagonal columnar mesophase of a HAT‐CONHR derivative is characterized by the smallest inter‐disk distance ever found in columnar liquid crystals (3.18–3.20 Å). This additional attractive interact…
ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTMolecular-Weight and Cooling-Rate Dependence of Simulated Tg for Amorphous PolystyreneAlexey V. Lyulin, Nikolaj K. Balabaev, and M. A. J. MichelsView Author Information Group Polymer Physics, Eindhoven Polymer Laboratories and Dutch Polymer Institute, Technische Universiteit Ei…
A family of self‐assembled zinc terpyridyl polymers that exhibit emission colors ranging from violet to yellow (see Figure) with high photoluminescence (PL) quantum yields has been developed. These polymers are promising light‐emitting materials for electroluminescent (EL) devices, and the EL of the Zn terpyridyl poly…
Calorimetric experiments on network glasses provide information on the ergodicity (landscape) temperature of supercooled liquids and can be compared with a recent theory developed by Hall and Wolynes [PRL90, 085505 (2003)]
Bystroem-Evers compound Ag5 Pb2O6 has been annealed at 500-540 K under flow of electric current which results in a textured structure and anisotropic colossal electric conductivity (> 10^9 ohm-1cm-1) between 210-525 K. The related physical properties are primarly governed by dissociation of Ag from c-axis channels and…
This paper investigates the effective wall thickness of a single-walled carbon nanotube, a critical quantity for any research in mechanics and property characterization of carbon nanotubes. To this end, the response of a bundle of single-walled carbon nanotubes to external hydrostatic pressure was modeled using the ri…
A novel fast‐heating chemical vapor deposition (CVD) method to grow ultralong, well‐aligned single‐walled carbon nanotubes (SWNTs) is developed. The control of lengths and growth directions provided by this CVD technique is used to fabricate ordered, large‐scale nanotube structures. The Figure shows an ultralong SWNT.
Ordered mesoporous carbon , named as NCC‐1, has been synthesized via a nanocasting process using SBA‐15 as the template and diluted furfuryl alcohol solution as the carbon source. NCC‐1 shows a bimodal pore size distribution (see Figure) in the mesopore range and a high pore volume up to 3.2 cm 3 g –1 . Since the pore…