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。
We demonstrate the epitaxial growth of hexagonal Pr2O3(001) on Si(111), with x-ray ω-scan full width at half maximum values as low as 0.06°, which is comparable with Si substrates. We find that a phase transition takes place during the anneal of the as-grown films in N2 below the growth temperature. The annealed films…
Ferroelectric materials with Bi-layered structure such as SrBi2Ta2O9 and SrBi2Nb2O9 are now intensively investigated in view of their applications in nonvolatile computer memories and high-temperature piezoelectric transducers. When Sr2+ is substituted with Ba2+, a significant disorder is induced and the material exhi…
La(Fe x Si 1−x ) 13 compounds exhibit an itinerant-electron metamagnetic (IEM) transition above Curie temperature TC. The IEM transition in the compound with x=0.88 is accompanied by a giant volume change. From a practical viewpoint, TC was controlled by hydrogen absorption in order to obtain such a giant volume magne…
Recent theories of spin-current-induced magnetization reversal are formulated in terms of a spin-mixing conductance $G^{mix}$. We evaluate $G^{mix}$ from first-principles for a number of (dis)ordered interfaces between magnetic and non-magnetic materials. In multi-terminal devices, the magnetization direction of a one…
We study the meandering instability during growth of an isolated nanostructure, a crystalline cone, consisting of concentric circular steps. The onset of the instability is studied analytically within the framework of the standard Burton-Cabrera-Frank model, which is applied to describe step flow growth in circular ge…
It has been long suspected that spin fluctuations in the weak itinerant ferromagnet ZrZn2 may lead to a triplet superconductivity in this material. Here we point out another possibility, a spatially inhomogeneous singlet superconducting state (a Fulde-Ferrell-Larkin-Ovchinnikov state). We report detailed electronic st…
Thin films of Nd0.5Ca0.5MnO3 manganites with colossal magnetoresistance (CMR) properties have been synthesized by the pulsed-laser deposition technique on (100)-(SrTiO3). The lattice parameters of these manganites and correlatively their CMR properties can be controlled by the substrate temperature TS. The maximum CMR…
We describe the experimental observation of a crystal structure formed by glycerol droplets suspended in a nematic liquid crystal. The structure exhibits a high density hexagonal ordering. We have experimentally observed a noticeable interaction between droplets with tangential boundary conditions. Within the scope of…
Ultrafine-grained (UFG) Ti samples have been prepared using equal channel angular pressing followed by cold rolling and annealing. The deformation behavior of these materials, including strain hardening, strain rate dependence of flow stress, deformation/failure mode, and tensile necking instability, have been systema…
New dissymmetric tertiary amines (N(3)SR) with varying N/S donor sets have been synthesized to provide mono- and dinuclear complexes. Acetate ions are used to complete the octahedral coordination sphere around nickel(II) atom(s). The facile conversion of mononuclear to dinuclear systems can be controlled to produce ei…
To better understand the complicated phenomena in a precipitation process, computational fluid dynamics (CFD) is utilized to account for reactions, crystallization, mixing, and their interactions. The moment transformations of the population balances taking into account the chemical and crystallization kinetics are in…
The four-dimensional +-J random-bond Ising model is studied using ground-state calculations. System sizes up to N=6^4 spins are considered. Here it is found that the ferromagnetic-spin glass transition occurs at a critical concentration p_c=0.28(1) of the antiferromagnetic bonds, which is comparable to values found pr…
Circular dichroism spectroscopy has been used to study the self-assembly of two series of m-phenylene ethynylene oligomers in highly polar solvents. The helical conformation of shorter oligomer lengths was found to be stabilized in aqueous acetonitrile solutions, while longer oligomers began to interact intermolecular…
Two dendritic peptides containing a branched lysine core and up to eight azobenzene moieties in the periphery were synthesized on solid support employing the omega-amino acid 4-(aminomethyl)phenylazobenzoic acid. With an additional peptidic tail consisting of an oligolysine portion, water solubility was achieved for t…
In biological systems the detailed structure of macromolecules is usually encoded genetically. Here we show that the synthesis and structure of certain biopolymers can be directed by taking control of the reaction pathways in microorganisms to direct the reaction kinetics. The biological synthesis of polyhydroxyalkano…
A method to prepare a new class of dianhydrides is outlined. A representative polyimide, PPI, has been prepared by a two-stage condensation reaction between polyphenylated dianhydride and 3,6-diamino-9-hexylcarbazole. The PPI is readily soluble in common organic solvents, and shows only 10 wt % loss at 555 °C.
To mimic the regulation mechanisms and the selective chemistry of enzymes in the absence of a protein environment, a novel bio-inspired catalyst design strategy is applied with photosensitive coordination compounds acting as photocatalytic artificial enzymes (photozymes). As an example, a robust synthetic oxidoreducta…
Finely divided Pd particles (2−3 nm in diameter) were synthesized by the reduction of Pd 2+ precursor ions in the presence of cationic (myristyltrimethylammonium bromide, MTA + Br - ) or anionic (sodium dodecyl sulfate, Na + DS - ) surfactants. The protective adsorption layer of the ionic surfactants around the partic…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTHigh Activity Enzyme Microcrystal Multilayer FilmsWen Jin, Xiangyang Shi, and Frank CarusoView Author Information Max Planck Institute of Colloids and Interfaces D-14424 Potsdam, Germany Cite this: J. Am. Chem. Soc. 2001, 123, 33, 8121–8122Publication Date (Web):July 2…
Production of biodegradable thermoplastics, polyhydroxyalkanoates (PHAs), from organic wastes may provide multiple benefits to environmental conservation efforts. In this study, microfiltration-coupled reactors were set up to study the dynamic behavior of a typical PHA-producing bacteria, Ralstonia eutropha, fed with…