Materials Literature
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Charge ordering in the low-temperature triclinic structure of titanium oxide (Ti4O7) is investigated using the local density approximation (LDA)+U method. Although the total 3d charge separation is rather small, an orbital order parameter defined as the difference between t2g occupancies of Ti$^{3+}$ and Ti$^{4+}$ cat…
The structure and transport properties of SiO2-Al2O3 melts containing 13 mol% and 47 mol% Al2O3 are investigated by means of large scale molecular dynamics computer simulations. The interactions between the atoms are modelled by a pair potential which is a modified version of the one proposed by Kramer et al. [J. Am.…
X-ray crystallography is the most powerful method for determining the three-dimensional structure of biological macromolecules. One of the major obstacles in the process is the production of high-quality crystals for structure determination. All too often, crystals are produced that are of poor quality and are unsuita…
The growth of large-area, patterned and oriented ZnO nanowires on silicon using a low temperature silicon-CMOS compatible process is demonstrated. Nanowire synthesis takes place using a thin nucleation layer of ZnO deposited by radiofrequency magnetron sputtering, followed by a hydrothermal growth step. No metal catal…
Initiated chemical vapor deposition (iCVD) is able to synthesize linear and cross-linked poly(2-hydroxyethyl methacrylate) (PHEMA) thin films, in one step, from vapors of 2-hydroxyethyl methacrylate (HEMA), ethylene glycol diacrylate (EGDA), and tert-butyl peroxide (TBPO) without using any solvents. This all-dry techn…
Highly fluorescent CdTe@SiO2 core–shell-structured spheres (see Figure) are prepared via hydrolysis and condensation of tetraethyl orthosilicate in water-in-oil emulsions. Systematic results reveal that the electrostatic interactions between negatively charged CdTe nanocrystals (NCs) and silica intermediates play a cr…
A new type of supercapacitor electrode is reported, prepared by pressing a carbon nanotube/polyacrylonitrile blend and then pyrolyzing the pellet (see Figure). Although their specific surface area is very low, e.g., 200 m2 g–1, the C/C composites demonstrate high values of capacitance, up to 100 F g–1. The authors pro…
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…