Materials Literature
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New modern technologies require new materials. During the past decade, the movement towards nanodimensions in many areas of technology aroused a huge interest in nanostructurized materials. The present article reviews recent works dealing with electrochemistry-related aspects of nanostructurized conducting polymers. E…
We report the preparation and characterization of charged, amphiphilic block copolypeptides that form stable vesicles and micelles in aqueous solution. Specifically, we prepared and studied the aqueous self-assembly of a series of poly(L-lysine)-b-poly(L-leucine) block copolypeptides, KxLy, where x ranged from 20 to 8…
ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTArtificial Lotus Leaf by NanocastingManhui Sun, Chunxiong Luo, Luping Xu, Hang Ji, Qi Ouyang, Dapeng Yu, and Yong ChenView Author Information Center for Microfluidics and Nanotechnology, Peking University, 100871 Beijing, PR China, School of Physics, Peking University, 100871 B…
The unique properties of magnetic nanocrystals provide them with high potential as key probes and vectors in the next generation of biomedical applications. Although superparamagnetic iron oxide nanocrystals have been extensively studied as excellent magnetic resonance imaging (MRI) probes for various cell trafficking…
The Rb87 spin-lattice relaxation time of Rb2CoCl4 single crystals grown using the slow evaporation method was measured using nuclear magnetic resonance. The recovery trace for the central line of Rb87 with dominant magnetic relaxation cannot be represented with a single exponential function, but can be represented wit…
Epitaxial Pb(Zr0.2Ti0.8)O3 (PZT) films with various thicknesses were prepared on an epitaxial SrRuO3(SRO) bottom electrode grown on SrTiO3 (STO) with atomically flat surface. The PZT films with a rms roughness of 0.2–0.3 nm exhibit a typical square-shaped P-E hysteresis loop, which has the Pr of approximately 60μC∕cm2…
Hydrogen-loaded nanocrystalline graphite samples have been prepared by mechanical milling under a hydrogen atmosphere. Milling vials and balls made of agate and ZrO2 have been used to prepare samples with hydrogen contents between 1 and 2wt%. The proton nuclear-magnetic-resonance (H1-NMR) spectra of these samples are…
Mycoplasma pneumoniae 5,10-methenyltetrahydrofolate synthetase [MTHFS; also known as 5-formyltetrahydrofolate cycloligase; Enzyme Commission (EC) 6.3.3.2] belongs to a large cycloligase protein family with 97 sequence homologues from bacteria to human. To help define the molecular (biochemical and biophysical) functio…
This paper presents a micro-fuel processor to produce hydrogen for micro-fuel cells. The micro-fuel processor has an original design for a heat source and a reforming chamber to improve thermal efficiency. To improve the mechanical strength as well as to maintain the effectiveness of thermal isolation, the reaction ar…
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A peculiar preparation routine, namely, a discrete deposition, is proposed for a goal-oriented change of electric and magnetotransport properties of the doped manganite films. The distinguishing feature of such procedure is a division of the whole deposition process into several cycles consisting of the deposition its…
Large-scale computer simulations show that two orthogonal external fields can control the orientation of lamellar microdomains in diblock copolymers in three dimensions and lead to an enhanced long-range ordering.
Optical observation, differential scanning calorimetry, thermogravimetric analysis, and differential thermogravimetric measurements have been carried out on (NH4)H2PO4 single crystal in the temperature range of 30–250°C. The results show that the crystal starts to decompose at around 160°C. Upon heating, ammonia NH3 e…
The conformational properties and static structure of freely jointed hard-sphere chains in matrices composed of stationary hard spheres are studied using Monte Carlo simulations and integral equation theory. The simulations show that the chain size is a nonmonotonic function of the matrix density when the matrix spher…
Abstract Raman spectra from real‐world, phosphorus‐poisoned automotive catalysts can be remarkably complicated, owing to the fact that factors such as variable driving conditions, catalyst formulations, and oil and fuel additives can contribute to the formation of a huge variety of compounds. To classify the Raman spe…
Filled carbon nanotubes represent a class of tunable nanoscale materials that could provide both high-quality resonance and sensing specificity for nanoresonator-based devices. We have studied the mechanical properties of C60-filled single-walled carbon nanotube bundles through observation of their mechanical resonanc…
Ba Al 2 S 4 : Eu thin films were prepared from a multilayered BaS:Eu∕Al2S3 thin-film structure, deposited with electron-beam evaporation. Depending on the deposition and postdeposition annealing temperature, europium-doped BaAl2S4 thin films can show both an orthorhombic and the more common cubic crystal structure. Th…
Measurements of the dielectric constant of amorphous and crystalline Pr2O3 are reported. The high value ∼25 for the polycrystalline phase is discussed in terms of the network structure and comparison is made with heavy rare-earth oxide values. The specific cases of LaAlO3 and Ta2O5 are also discussed and the role of n…
Abstract A series of new AB type azobenzene monomers based on various substituted phenols and higher order fused/extended aromatic rings were synthesized and their hyperpolarizability tensor β determined by hyper‐Rayleigh scattering (HRS) measurement in methanol. The electron donor (OH) and acceptor units (COOH) wer…
Contact effects between solution processed conducting polymer electrodes with semiconducting polymers in field effect transistors are investigated. Limited conductivity of polymer electrodes and interfacial doping of the active semiconducting polymer by the conducting polymer electrode are found to be two important fa…