Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
Single-walled carbon nanotubes have been functionalized and the specific surface areas of the functionalized nanotubes measured. Contrary to expectations, functionalization leads to a decrease in specific surface area compared to that of the unfunctionalized nanotubes. Treatment with a concentrated 1:1 nitric/sulfuric…
A thermally reversible repulsive hard-sphere to sticky-sphere transition was studied in a model colloidal system over a wide volume fraction range. The static microstructure was obtained from high resolution small angle x-ray scattering, the colloid dynamics was probed by dynamic x-ray and light scattering, and supple…
Poly(epsilon-caprolactone)/polystyrene (PCL/PS) blends, where nonamphiphilic PS is glassy in the bulk state at the experimental temperature of 22.5 degrees C, are immiscible as Langmuir films at the air/water (A/W) interface. Surface pressure-area per monomer isotherm analyses indicate that the surface concentration o…
The transport of guest molecules between adjacent pore channels (cross-wall transport) is the limiting factor in the release of guest molecules from SBA-3-like fibers. This specific mode of diffusion is identified by microscopic observation and studied quantitatively in a UV/Vis-monitored release experiment. Analysis…
A light-emitting poly (distyryldimethylbenzene-co-triethylene glycol) rod-coil block copolymer was used to fabricate films with three-dimensionally ordered honeycomb structures by the breath-figure method. Photocurrent generation and photovoltaic performance are studied, and the dependence of photocurrent on applied e…
We introduce a geometric analysis of random sphere packings based on the ensemble averaging of hard-sphere clusters generated via local rules including a nonoverlap constraint for hard spheres. Our cluster ensemble analysis matches well with computer simulations and experimental data on random hard-sphere packing with…
We propose a metamaterial with a three-layer structure based on Faraday's law. The metamaterial is simply formed by a pair of homogeneous parallel plates separated by a thin medium. We also propose a virtual current loop with length of $2a$ ($a$ is the attenuation constant) in the plates, which can be formed upon exci…
In this paper, we investigate the dependence of the bistable electro-optic response of organosiloxane based smectic A liquid crystals on key material properties; the modes are optically scattering (<100 Hz) and clear (>1 kHz), respectively. The scattering mode is generated by motion of doped ionic species and is depen…
Abstract MnZnFe 2 O 4 ferrite nanoparticles were prepared by co-precipitation method using a microwave heating system at temperature of 100 °C. X-ray diffraction reveals the samples as prepared are pure ferrite nanocrystalline phase, transmission electron microscopy image analysis shows particles are in agglomeration…
Von Kugeln zu Spiralen: Tripodale Squaraine aggregieren aus Acetonitril zu hohlen Kugeln, die bei Komplexierung mit Ca2+ oder Mg2+ ausgedehnte Netzwerke bilden. Ein analoger chiraler Farbstoff zeigt bei der Bindung von Ca2+ ein bisignates CD-Couplet und eine helicale Morphologie (siehe Bild). Die molekulare Chiralität…
We apply a first-principles method, based on the density functional theory, to calculate the structural stability and electronic properties of B x N y C z nanotubes. We follow the evolution of the electronic and structural properties as a function of the composition, atomic structure and nanotube diameter. The results…
For the first time, Eu 8.18 Na 1.08 (SiO 4 ) 6 (OH) 1.62-2 y O y (Eu apatite) and Eu 3.96 Gd 3.96 Na 1.2 (SiO 4 ) 6 (OH) 1.86-2 y O y (Eu−Gd apatite) were synthesized at mild hydrothermal conditions. Powder X-ray analysis suggested a preferential substitution of Ln 3+ by Na + ions in 4f position for both materials. Th…
The complex cations [RuL2(H2biim)]2+ (L=bipy, 4,4'-tBu2-bipy) interact with cyanometallate anions via a chelating hydrogen-bonding interaction between the two N-H donors of the complex cation and the N lone pair of one cyanide ligand in the complex anion; the anion hexacyanoferrate(III) quenches the Ru(II)-based lumin…
The unique absorption properties of the 9-hydroxyphenalen-1-one (HPHN) ligand have been exploited to obtain visible-light-sensitizable rare-earth complexes in 1:3 and 1:4 metal-to-ligand ratios. In both stoichiometries (1:3, tris, Ln(PHN)3; 1:4, tetrakis, A[Ln(PHN)4], with Ln being a trivalent rare-earth ion and A bei…
The preparative flexibility of hydrothermal syntheses needs to be systemised for exploring complex structure-synthesis relationships and morphology control options in materials chemistry. This is demonstrated for the targeted hydrothermal preparation of molybdenum oxide materials: firstly, in situ studies were employe…
In this work, relationships between chemical and physical properties of fluorine doped tin oxide films prepared by the chemical spray pyrolysis technique have been studied. Changes in the structural, optical and electrical properties of these films in relation to their doping concentrations determined by the resonant…
We show that electropolishing of tantalum metal in a single step of about 5 min can reproducibly lead to dimples tens of nanometers in diameter, regular in shape, monodispersed in size, and arranged in highly ordered arrays which even transverse grain boundaries. Dimpled tantalum is ductile, high melting, and chemical…
Conjugated polymers are excellent barriers for membrane separations because their porosity can be controlled at the molecular level through chemical doping. Polyaniline (PANI) is particularly attractive because simple acid/base doping/undoping enables a controllable level of doping that can be readily achieved using d…
The different reactions between edge or screw dislocations and interstitial Frank loops were studied by means of molecular dynamics simulations. The calculations were performed at 600 K using an embedded atom method (EAM) potential describing a model FCC material with a low stacking fault energy. An interaction matrix…
A Comment on the Letter by Hoonkyung Lee, Woon Ih Choi, and Jisoon Ihm, Phys. Rev. Lett. 97, 056104 (2006).Received 2 October 2006DOI:https://doi.org/10.1103/PhysRevLett.97.209601©2006 American Physical Society