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。
Monodispersed particles of the mesocaged material AMS-8 have been prepared by using nonionic polymeric cosurfactants to control the particle size. These particles are faceted, porous, and show surface structural characteristics that are typical of cubic AMS-8 (see picture), as well as an increased adsorption capacity…
Abstract Magnetic Ni 0.5 Zn 0.5 Fe 2 O 4 ‐crosslinked polyaniline composites with a core–shell structure were prepared in the presence of Ni 0.5 Zn 0.5 Fe 2 O 4 magnetic powder in a toluene solution containing iron chloride as a surfactant and dopant. Structural characterization by Fourier transform infrared, X‐ray di…
We develop a self-consistent-field lattice model for block copolymers and propose a novel and general method to solve the self-consistent-field equations. The approach involves describing the polymer chains in a lattice and employing a two-stage relaxation procedure to evolve a system as rapidly as possible to a free-…
We describe the preparation of polystyrene−polyisoprene−polylactide and polyisoprene−polystyrene−polylactide ABC triblock terpolymer thin films followed by removal of one or both sacrificial components (i.e., polylactide and polyisoprene) to give large area arrays of nanopores and more complex “nanobushing” structures…
Thermoresponsive gold nanoparticles (GNPs) have been prepared by the borohydride reduction of gold salt in the presence of water-soluble polymer, poly(vinyl methyl ether) (PVME). The PVME-coated GNPs (PVME-GNPs) have been assembled into large aggregates in the presence of polyelectrolytes, viz., poly(sodium-4 styrene…
${\mathrm{Sr}}_{2}{\mathrm{FeMoO}}_{6}$ samples with various degrees of Fe, Mo ordering were prepared from a sol-gel-derived precursor with a sample-encapsulation technique. The order parameter $\ensuremath{\xi}$ for Fe and Mo, determined by Rietveld refinement, ranged from 0.56 to 0.95. Structural data suggest that t…
Cd1-xMnxS (x = 0.1-0.3) nanowires were synthesized by using the chemical vapor deposition method. They all consist of a single-crystalline wurtzite CdS structure with a [010] or [011] growth direction. The X-ray diffraction pattern reveals the contraction of the lattice constants due to the incorporation of Mn. The Mn…
A series of donor--bridge--acceptor (D--B--A) systems with varying donor-acceptor distances have been studied with respect to their triplet energy transfer properties. The donor and acceptor moieties, zinc(II), and free-base porphyrin, respectively, were separated by 2-5 oligo-p-phenyleneethynylene units (OPE) giving…
Thick or thin? Hydrogen-bonded bis-urea forms two distinct rodlike assemblies—thick or thin filaments—in a variety of aromatic solvents. The stability of each is dependent on the size of the solvent molecules and a simple viscosity test (see figure) differentiates between them.
Branching out: Pd-catalyzed iterative triarylations of vinylboronate afford conjugated dendrimers with triarylethene branches (see picture) in a flexible and convergent manner. These highly branched dendrimers reveal good solubility in common organic solvents and exhibit high quantum yields of fluorescence, with the c…
A hierarchical structure of mesoporous−macroporous phosphated aluminum (oxyhydr)oxide (PAl) materials was prepared via a simple self-assembly process with the use of precursor aluminum sec -butoxide in a mixed solution of H 3 PO 4 and Na 2 HPO 4 . Direct phosphation resulted in the incorporation of phosphorus into the…
We report the resonant Raman spectra of individualized $(=debundled)$ single-walled carbon nanotubes (SWNTs) having diameters $d\ensuremath{\sim}0.8--1.3\phantom{\rule{0.3em}{0ex}}\mathrm{nm}$ subject to compression up to $10.5\phantom{\rule{0.3em}{0ex}}\mathrm{GPa}$. Both SWNTs in water-surfactant dispersions as well…
A full range of ${\mathrm{SrRu}}_{1\ensuremath{-}x}{\mathrm{Cr}}_{x}{\mathrm{O}}_{3}$ perovskite solid solutions $(0<x<1)$ has been prepared using high temperatures and pressures up to $10.5\phantom{\rule{0.3em}{0ex}}\mathrm{GPa}$. The structure changes from orthorhombic Pbnm at low $x$ through a previously unre…
We report experimental evidence for the charge-orbital ordering in magnetite below the Verwey transition temperature T(V). Measurements of O K-edge resonant x-ray scattering on magnetite reveal that the O 2p states in the vicinity of the Fermi level exhibit a charge-orbital ordering along the c axis with a spatial per…
The effect of specimen size on the uniaxial deformation response of planar single crystals and polycrystals is investigated using discrete dislocation plasticity. The dislocations are all of edge character and modelled as line singularities in a linear elastic material. The lattice resistance to dislocation motion, di…
Long-term memory aid: A one-handed helical poly(phenylacetylene) with positively charged pendant groups can serve as the template for supramolecular helical arrays of achiral porphyrins with opposite charges in acidic water. The supramolecular chirality induced in the porphyrin aggregates can be memorized even after t…
Natural inspiration: A lotus-leaf-like hierarchical structure is formed on a polycarbonate plate under mild conditions by successive plasticization and coagulation of the polymer surface. The resultant micron- and nanoscale rough structure, shown in the figure allows the common plastic to be superhydrophobic with a la…
Transition metal complexes involving the benzene-1,2-dithiol (L(2-)) and Sellmann's 3,5-di-tert-butylbenzene-1,2-dithiol(L(Bu 2-)) ligands have been studied by UV-vis, infrared (IR), and resonance Raman (rR) spectroscopies. Raman spectra were obtained in resonance with the intervalence charge transfer (IVCT) bands in…
In control: The secondary structure dependent self-assembly of β-peptides in solution proves that natural biopolymers are not unique in their highly structured conformational behavior. Stereochemically controlled secondary structural units of β-peptide strands and helices intrinsically self-associate into pleated-shee…
Two 2D supramolecular structures of macrocycle 1 and 1/C60 have been obtained on HOPG by self-assembly under ambient conditions and investigated by high-resolution STM. The monolayers of 1 are characterized by structures with perfect ordering over relatively large areas. In the case of 1/C60, the size of the macrocycl…