Materials Literature
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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…
Topographical confinement is used to template the formation of nanoscale domains in a self‐assembled block copolymer film. The topographical template controls the row spacings and feature dimensions of the copolymer and can deliberately introduce defects in the arrays (see Figure). For example, a sharp edge feature le…
New ways of detecting low concentrations of analytes , which could be used as part of integrated on‐chip devices, are offered by surface‐enhanced Raman‐scattering substrates fabricated on the nanoscale. The ability of metal surfaces to amplify a Raman‐scattering signal (see Figure) is combined with an enlarged substra…
Adhesion, spreading, proliferation, and collagen matrix production of human bone marrow stromal cells (BMSCs) on an RGD-modified silk matrix was studied. Anterior cruciate ligament fibroblasts (ACLFs) were used as a control cell source. Scanning electron microscopy (SEM) and MTT analyses demonstrated that the modified…
We report conductivity measurements of Cr-doped V2O3 using a variable pressure technique. The critical behavior of the conductivity near the Mott insulator to metal critical endpoint is investigated in detail as a function of pressure and temperature. The critical exponents are determined, as well as the scaling funct…
Abstract Needle‐like ZnO nanowires with high density are grown uniformly and vertically over an entire Ga‐doped conductive ZnO film at 550 °C. The nanowires are grown preferentially in the c ‐axis direction. The X‐ray diffraction (XRD) θ‐scan curve shows a full width at half maximum (FWHM) value of 2°. This indicates…
Abstract By simply changing the molar ratio of the dopant to monomer, the morphology of salicylic acid (SA)‐doped polyaniline (PANI) can be changed from one‐dimensional nanotubes (∼ 109–150 nm in diameter) to three‐dimensional hollow microspheres (∼ 1.5–3.1 μm in diameter) via a self‐assembly process. Freeze–fracture…
Free‐standing metal foam structures with nano‐dendritic walls of copper and tin are fabricated by an electrochemical deposition process. This unique structure is attributed to the concurrent generation of hydrogen bubbles with extremely fast metal deposition at high cathodic current densities. The Figure shows a typic…
Tissue engineering aims at resolving problems such as donor shortage and immune rejection faced by transplantation. Scaffolds (artificial extracellular matrices) have critical roles in tissue engineering. Recently, we developed nano-fibrous poly(L-lactic acid) scaffolds under the hypothesis that synthetic nano-fibrous…
Abstract Mechanical attrition, mechanical alloying and other methods of extreme plastic deformation (high pressure torsion, equal channel angular pressing) have been developed as versatile alternatives to other physical and chemical processing routes in preparing nanophase materials. Here several examples are discusse…