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。
In this paper, a hydrothermal synthetic route has been developed to prepare a class of rare-earth fluoride nanocrystals, which have shown gradual changes in growth modes with decreasing ionic radii and may serve as a model system for studying the underlying principle in the controlled growth of rare-earth nanocrystals…
A real turn-on: Two nonplanar three-coordinate boron compounds were synthesized as fluorescent sensors for fluoride that utilize charge-transfer emission. The fluorescence of one of the sensors turns on (see picture) and the other turns off in the presence of fluoride.
A facile wet chemical synthesis method was used to prepare a range of single-crystal Na(Y1.5 Na0.5)F6 nanorods with controllable aspect ratios. Their novel multicolor upconversion (UC) fluorescence has been successfully realized by doping Yb3+/Er3+ (green) and Yb3+/Tm3+ (blue) ion pairs. When doped with Eu3+ and Tb3+…
A new method to stabilize and functionalize surfaces for surface-enhanced Raman spectroscopy (SERS) is demonstrated. Atomic layer deposition (ALD) is used to deposit a sub-1-nm alumina layer on silver film-over-nanosphere (AgFON) substrates. The resulting overlayer maintains and stabilizes the SERS activity of the und…
The nature of the charge carriers in 2D few-layer graphites (FLGs) has been recently questioned by transport measurements [K. S. Novoselov, Science 306, 666 (2004)10.1126/science.1102896] and a strong ambipolar electric field effect has been revealed. Our density functional calculations demonstrate that the electronic…
The polyoxometalate (NH(4))(6)H(2)(CeMo(12)O(42)).9H(2)O (abbreviated as Ce(IV)Mo(12)) was synthesized, and its Ce(III) form was obtained by exhaustive electrochemical reduction. Both forms are fairly stable in pH 0.0 media. This stability decreases when the pH increases. The Ce(IV) species, in which the central metal…
The principle of dual-space phasing is used in dealing with protein SAD data. Four programs are involved in iterative dual-space fragment extension to improve automatic model building. OASIS-2004 is used to break the phase ambiguity intrinsic in the SAD experiment. In the initial cycle, discrimination of SAD phase dou…
A nanogroove-striped pattern was formed on a NiO film surface. The periodic nanopattern was successfully obtained over the entire surface via high-temperature annealing of the epitaxial NiO thin film, which was grown on an atomically stepped sapphire substrate at low temperature. The depth, width and interval of strai…
The Jahn-Teller distortive transition of ${\mathrm{LaMnO}}_{3}$ is described by a modified three-state Potts model. The interactions between the three possible orbits depends both on the orbits and their relative orientation on the lattice. Values of the two exchange parameters which are chosen to give the correct low…
Abstract We report the stereocontrol of diene polymers by the topochemical polymerization of alkoxy‐substituted benzyl muconates in the solid state. A monomer stacking structure is controlled by the weak intermolecular interactions in the monomer crystals, depending on the structure and position of the alkoxy‐substitu…
The practical applicability of in-house structure determination using Cr K alpha X-rays (2.29 A) and a loopless free crystal-mounting method was examined using five novel proteins. Proteins from 9.6 to 84 kDa have been solved using this method without any derivatization. In all cases, more than 90% of structures were…
Straight curls: Conjugated polymers are aligned through the use of twining porphyrin oligomers (twimers), which act as helical “hosts” that twine around and are included within a single conjugated polymer. The resulting composites aggregate into relatively large 2D structures in the solid state and exhibit well-orient…
Pairing together planar material slabs with opposite signs for the real parts of their constitutive parameters has been shown to lead in the steady-state regime to interesting and unconventional properties that are not otherwise observable for single slabs, such as resonance, anomalous tunneling, transparency, and sub…
An automated crystal-mounting/alignment system has been developed at Lawrence Berkeley National Laboratory and has been installed on three of the protein-crystallography experimental stations at the Advanced Light Source (ALS); it is currently being implemented at synchrotron crystallography beamlines at CHESS, NSLS a…
A series of chromium-incorporated MSU-x mesoporous molecular sieves were synthesized under different templates, initial Si/Cr molar ratios, aging times, and temperatures in acid solution. The synthesis was performed by using sodium silicate, chromium nitrate, and nonionic poly(ethylene oxide) surfactant as the source…
The electrochemical impedance spectroscopy (EIS) technique was used for the study of the electrochemical behavior of an equiatomic NiTi alloy and an implant quality AISI 316 stainless steel type ASTM F138. Experiments were carried out using four different different test solutions: phosphate buffered saline (PBS), Dulb…
Abstract Summary: We used the dissipative particle dynamics method to simulate the self‐assembly of symmetric triblock copolymers of the type ABA. Depending on the volume fraction of the end blocks f A , several mesophases including lamellar, perforated lamellar, gyroid, hexagonal cylinders and bcc spherical micelles…
A new family of hexameric metallomacrocycles employing a functionalized bis(terpyridine) building block was prepared by both self-assembly and stepwise procedures capitalizing on terpyridine−metal(II)−terpyridine connectivity. Their structural composition was established by NMR, UV/vis, and mass techniques. Treatment…
Colloidal particles prepared by using the layer-by-layer technique are increasingly finding application in diagnostics, drug delivery, and sensing. Herein, we outline methods for applying three established techniques, confocal laser scanning microscopy (CLSM), flow cytometry, and differential interference contrast (DI…
The ACORN system was originally developed as a means of ab initio solution of protein structures when atomic resolution data were available. The first step is to obtain a starting set of phases, which must be at least slightly better than random. These may be calculated from a fragment of the structure, which can be a…