Zn nanobelts: a new quasi one-dimensional metal nanostructure
A large quantity of metal Zn nanobelts have been synthesized by a simple approach, which involves thermal decomposition of ZnS powder, followed by Zn deposition.
Materials Literature
文献浏览
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。
Fluoreszenzmikroskopische Verfolgung des photooxidativen Abbaus eines einzelnen aromatischen Kohlenwasserstoffmoleküls
Die Photooxidation einzelner Farbstoffmoleküle (siehe Schema) konnte mit konfokaler Fluoreszenzmikroskopie verfolgt werden. Die selbstsensibilisierte Reaktion mit Singulettsauerstoff führt zu einer Reihe von Produkten, die auf diese Weise erstmals spektral nachgewiesen und unterschieden werden können. Durch quantenche…
Effect of microgravity on Ca mineral crystallization and implications for osteoporosis in space
A study of the effect of microgravity on biomineralization/remineralization by considering Ca mineral nucleation under gravity and microgravity is presented. The structure of human bone is determined to a large extent by the turnover of the bone, which included nucleation of biominerals adjacent to biosubstrates. Hete…
Crystal structure of calcium-free human sorcin: A member of the penta-EF-hand protein family
Sorcin is a 22 kD calcium-binding protein that is found in a wide variety of cell types, such as heart, muscle, brain and adrenal medulla.It belongs to the penta-EF-hand (PEF) protein family, which contains five EF-hand motifs that associate with membranes in a calcium-dependent manner.Prototypic members of this famil…
Vibrational and relaxational contributions indisaccharide/H2Oglass formers
Among oligosaccharides, trehalose seems to be unique in nature as a bioprotector in drying and freezing processes. To understand the molecular mechanisms underlying the unusual bioprotective properties of trehalose in comparison with other disaccharides, the low-frequency dynamics of aqueous $({\mathrm{H}}_{2}\mathrm{…
Charge ordering in the one-dimensional extended Hubbard model: Implication to the TMTTF family of organic conductors
We study the charge ordering (CO) in the one-dimensional (1D) extended Hubbard model at quarter filling where the nearest-neighbor Coulomb repulsion and dimerization in the hopping parameters are included. Using the cluster mean-field approximation to take into account the effect of quantum fluctuations, we determine…
Ionic Channel Structures in [(M+)x([18]crown-6)][Ni(dmit)2]2 Molecular Conductors
The [(M+)x[18]crown-6)] supramolecular cations (SC+), in which M+ and [18]crown-6 are alkali metal ions (M+ = Li+, Na+, and Cs+) and 1,4,7,10,13,16-hexaoxacyclooctadecane, respectively, form ionic channel structures through the regular stacks of [18]crown-6 in [Ni(dmit)2]-based molecular conductors (dmit2+ = 2-thioxo-…
Operation of a gated field emitter using an individual carbon nanofiber cathode
We report on the operation of an integrated gated cathode device using a single vertically aligned carbon nanofiber as the field emission element. This device is capable of operation in a moderate vacuum for extended periods of time without experiencing a degradation of performance. Less than 1% of the total emitted c…
What Is the Difference between the Manganese Porphyrin and Corrole Analogues of Cytochrome P450's Compound I?
Density functional calculations on oxo-manganese complexes of corrole (1) and porphyrin (2 and 3) show a fundamental difference. The ground state of I is the singlet manganese(V) state, 1A(MnV), in which corrole is a closed shell. In contrast, 2 and 3 have high-spin manganese(IV) states, 1A1u and 3A2u respectively. Th…
Polyphenylene Dendrimers with Perylene Diimide as a Luminescent Core
A novel synthesis is presented of a fourfold ethynyl-substituted perylene diimide dye 4, which acts as a core molecule for the buildup of polyphenylene dendrimers. Around the luminescent core 4, a first-generation (5), a second-generation (6), and a third-generation (7) polyphenylene dendritic environment consisting o…
Artificial Enzymes Formed through Directed Assembly of Molecular Square Encapsulated Epoxidation Catalysts
Supramolecular complex formation imparts stability and substrate selectivity to a simple manganese-porphyrin-based epoxidation catalyst. Lewis acid/Lewis base directed assembly was used to encapsulate the epoxidation catalyst within a supramolecular square structure to form an enzyme-like catalyst system. The “molecul…
First-principles study of solute-dislocation interaction in aluminum-rich alloys
The strain dependence of the solution energy of substitutional species is derived by expanding the binary alloy energy with respect to concentration and strain to the second order. Within the approximation of small strain and concentration inhomogeneities, the energy change is found to be proportional to the solute-in…
Ferrimagnetic behavior ofNd0.67Sr0.33CoO3
The orthorhombic rare-earth cobaltate ${\mathrm{Nd}}_{0.67}{\mathrm{Sr}}_{0.33}{\mathrm{CoO}}_{3}$ is studied by neutron powder diffraction. The Co sublattice orders ferromagnetically below ${T}_{c}\ensuremath{\approx}200$ K with the magnetic moments aligned along the c axis. On cooling, ${\mathrm{Nd}}_{0.67}{\mathrm{…
Low-temperature resistance of individual single-walled carbon nanotubes: A theoretical estimation
The resistances of individual single-walled carbon nanotubes (SWNTs) are calculated based on Boltzmann transport equation, graphene approximation relation of electronic energy for SWNTs and weak localization (WL) theory. The theoretical results of resistance for SWNTs are compared with experimental measurements. It ha…
Close Correlation between the Magnetic Moments, Lattice Distortions, and Hybridization inLaMnO3andLa1−xSrxMnO3+δ: Doping-Dependent Magnetic Circular X-Ray Dichroism Study
The first observation of a magnetic circular x-ray dichroism (MCXD) at the Mn ${L}_{2,3}$ core edges in antiferromagnetic ${\mathrm{LaMnO}}_{3}$ shows canted spin and orbital ( ${m}_{\mathrm{orb}}$) moments arising from lattice distortions. An ${L}_{2,3}$-edge MCXD in ferromagnetic metals and insulators, ${\mathrm{La}…
Organosoluble and transparent polyimides derived from alicyclic dianhydride and aromatic diamines
Abstract Organosoluble polyimides were synthesized with the alicyclic dianhydride 1,8‐dimethylbicyclo[2,2,2]oct‐7‐ene‐2,3,5,6‐tetracarboxylic dianhydride and aromatic diamines. The polyimides possessed good solubility both in strong dipolar solvents and in common solvents; the thermal decomposition temperature of the…
Analysis of crystal structures of aspartic proteinases: On the role of amino acid residues adjacent to the catalytic site of pepsin-like enzymes
To elucidate the role of amino acid residues adjacent to the catalytic site of pepsin-like enzymes, we analyzed and compared the crystal structures of these enzymes, their complexes with inhibitors, and zymogens in the active site area (a total of 82 structures).In addition to the water molecule (W1) located between t…
Sol–gel preparation of single-layer, 0.75 μm thick lead zirconate titanate films from lead nitrate-titanium and zirconium alkoxide solutions containing polyvinylpyrrolidone
Lead zirconate titanate (PZT) films were deposited on nesa silica glass substrates by spin coating using a Pb(NO3)2–Zr(OC3H7n)4–Ti(OC3H7i)4 solution containing polyvinylpyrrolidone and acetylacetone. The coating solution had stable viscosity for over 1300 h at room temperature. Single-layer PZT films as thick as 0.75…
Lithium storage in polymerized carbon nitride nanobells
Polymerized carbon nitride nanobells (CNNBs) have been intercalated by a large amount of Li ions using an electrochemical method. Li nanocrystals are observed on the inside surface of CNNB walls, which is direct evidence that a Li nanocrystal can exist at the micropore structure at a heavy intercalating level. Graphen…
Perovskite phase stabilization in epitaxial Pb(Mg1/3Nb2/3)O3–PbTiO3 films by deposition onto vicinal (001) SrTiO3 substrates
We report the perovskite phase stabilization of 0.67Pb(Mg1/3Nb2/3)O3–0.33PbTiO3 (PMN-PT) epitaxial thin films by deposition onto miscut substrates. Films were grown on (001) SrTiO3 substrates with miscut angles from 0 to 8 degrees toward the [100] direction using 90° off-axis magnetron sputtering. Films on high miscut…