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。
Nanocrystalline (Th1-xFex)O2-d particles with different Fe concentrations (x = 0.0, 0.05, 0.10, 0.15, 0.20 and 0.25) have been prepared by a gel combustion method. Rietveld refinement analyses of X-ray diffraction data revealed the formation of an impurity free cubic type Th1-xFexO2-d structure up to x = 0.20. This ob…
The relation between force and stretch in the worm-like chain model of entropic elasticity is examined. Although no closed-form expression is valid for all values of forcing, solutions in the form of asymptotic series can be obtained under conditions of small and large applied force. The small and large stretch limits…
Growing well-diffracting crystals constitutes a serious bottleneck in structural biology. A recently proposed crystallization methodology for "stubborn crystallizers" is to engineer surface sequence variants designed to form intermolecular contacts that could support a crystal lattice. This approach relies on the conc…
Sol-gel processes for fabricating oxides or metalloxane polymers with controlled porous structures have been reviewed. Gel materials having controlled macropores are synthesized by polymerization-induced phase separation and concurrent sol-gel transition in a variety of chemical compositions. Several variations of tai…
We have clearly discriminated the single-, bilayer-, and multiple-layer graphene (<10 layers) on Si substrate with a 285 nm SiO2 capping layer by using contrast spectra, which were generated from the reflection light of a white light source. Calculations based on Fresnel's law are in excellent agreement with the exper…
We report an x-ray photoemission spectroscopy study of spin-crossover complex [Fe(ptz) 6 ](BF 4 ) 2 (ptz = 1-propyltetrazole) to identify the electronic changes due to temperature-induced and photoinduced spin transitions. The energy difference between the Fe 2 p and F 1 s peaks is found to correlate with the low-spin…
We present a non-lithographic technique that produces organized nanoscale nickel catalyst for carbon nanofiber growth on a silicon substrate. This technique involves three consecutive steps: first, the substrate is laser-irradiated to produce a periodic nanorippled structure; second, a thin film of nickel is deposited…
Gut verteilt: Ein hierarchisch geordnetes Material, in dem Goldnanopartikel entlang Kohlenstoffnanoröhren im Abstand von 2.6 nm positioniert sind (unten im Bild; oben: zugehörige TEM-Aufnahme), wird durch Selbstorganisation erhalten, wobei die Funktionalität des oberflächenaktiven Proteins HFBI (ein Hydrophobin) genut…
Nanotube alignment has been found to be one of the key parameters to explain the mechanical properties of carbon nanotube fibres. However, the question of the homogeneity of the alignment across the fibre diameter is still open. This letter reports on the first microdiffraction study of the alignment of nanotubes acro…
Serine hydroxymethyltransferase (SHMT) belongs to the alpha-family of pyridoxal 5'-phosphate-dependent enzymes and catalyzes the reversible conversion of L-Ser and tetrahydrofolate to Gly and 5,10-methylene tetrahydrofolate. 5,10-Methylene tetrahydrofolate serves as a source of one-carbon fragment in many biological p…
Preparation, structural investigation by neutron powder diffraction, and ferroelectic studies of an ordered perovskite BaBi0.53+(Bi0.25+Nb0.35+)O3 have been reported. This compound has rhombohedral structure with a centrosymmetric space group R3̄. Although the average structure is centrosymmetric, it exhibits ferroele…
The electronic structure, chemical bonding, geometry, and effects produced by Sr-doping in CaCO(3) have been studied on the basis of density-functional theory using the VASP simulation package and molecular-orbital theory utilizing the CLUSTERD computer code. Two calcium carbonate structures which occur naturally in a…
The redox properties of MCl2 (M=Mn, Fe, Co) acetonitrile solvates were electrochemically and spectroscopically characterized. The three voltammogram waves at 0.86, 0.48, and 0.21 V versus SCE for FeCl(2) dissolved in MeCN are assigned as one-electron reduction potentials for [Fe(II)Cl(x)(NCMe)4-x]2-x (1<or=x<or=3), re…
Doubly bridged mu-alkoxo-mu-X (X = pyrazolato or acetato) dinuclear MnIII complexes of 2-hydroxy-N-{2-hydroxy-3-[(2-hydroxybenzoyl)amino]propyl}benzamide) (H5L1) and 2-hydroxy-N-{2-hydroxy-4-[(2-hydroxybenzoyl)amino]butyl}benzamide (H5L2), [Mn2(L)(pz)(MeOH)4].xMeOH (1, L = L1, x = 0.5; 2, L = L2, x = 0; Hpz = pyrazole…
Synthesis and reversible redox interconversion between core-modified [32]heptaphyrin (1.1.1.1.1.0.0) and [30]heptaphyrin (1.1.1.1.1.0.0) are reported.
Batch-fabricated SiC nanowires were heated under an ammoniac flow up to 1400 °C. The ensuing product was characterized by SEM, HRTEM, EDX and XRD. As we found, SiC nanowires were completely converted into faceted α-Si 3 N 4 nanorods with diameters ranging from 10 to 500 nm and lengths lower than 10 µm. These nanorods…
Here we report on results of a spin-resolved photoelectron spectroscopic (SRPES) study of ${\mathrm{YCo}}_{2}$ thin films (150 \AA{}-thick) grown on a W(110) substrate. The films were prepared by co-deposition of stoichiometric amounts of Y and Co onto a clean W surface followed by thermal annealing leading to ($2\ifm…
Abstract The photophysical and photochemical properties of two 3,3‐diphenyl‐3H‐naphtho[2,1‐b]pyrans substituted in position 8 by phenylethynyl and p ‐nitrophenylethynyl groups, respectively, are investigated by femtosecond and nanosecond transient absorption spectroscopy. The spectral characteristics and dynamics of t…
Classical nucleation theory pictures the homogeneous nucleation of a crystal as the formation of a spherical crystalline embryo, possessing the properties of the macroscopic crystal, inside a parent supercooled liquid. In this work we study crystal nucleation in moderately supercooled sulfur hexafluoride by umbrella s…
Abstract In this study, the oxidative polycondensation reaction conditions of 4‐[(4‐methylphenyl)iminomethyl]phenol (4‐MPIMP) were studied by using oxidants such as air O 2 , H 2 O 2 , and NaOCl in an aqueous alkaline medium between 50 and 90°C. The structures of the synthesized monomer and polymer were confirmed by F…