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。
The development of spin–electronic devices based on oxide magnets is reviewed. After a discussion of colossal magnetoresistance in magnetic perovskites and an introduction of the concept of half metallicity, spin–electronic devices such as ferromagnetic tunnel junctions, grain–boundary junctions, ferromagnet–supercond…
Positive magnetoresistance is measured in the low-magnetic fields in multiwalled carbon nanotubes, and interpreted as antilocalization in the weak-localization regime. The analysis shows that the weak antilocalization effect is related to the local interfacial electric field as a genuine property of the large curvatur…
This paper demonstrates that the pattern of silver particles embedded in the gelatin matrix of exposed and developed silver halide-based photographic film can serve as a template in a broadly applicable method for the microfabrication of metallic microstructures. In this method, a CAD file is reproduced in the photogr…
4\ifmmode\times\else\texttimes\fi{}4 matrices have been used extensively to study the propagation of light in anisotropic layered systems whose principal optic axes have arbitrary orientation. We present a general theory for the propagation of light in arbitrarily anisotropic layered systems that is particularly suite…
Raman spectroscopy has been used for the first time for the characterization of perfectly 1:1 alternating α-olefin:carbon monoxide aliphatic polyketones produced by the polymerization of ethene with carbon monoxide (ECO polymers) and mixtures of ethene and propene with carbon monoxide (EPCO polymers). A procedure to d…
The adsorption mechanisms in layer-by-layer films of poly( o -methoxyaniline) (POMA) alternated with poly(ethene sulfonic acid) (PVS) are controlled by H-bonding, even for charged POMA where electrostatic interactions were expected to predominate. This is shown here by analyzing adsorption isotherms using three analyt…
Oscillations with a period of $\ensuremath{\sim}150$ fs are observed in the four-wave mixing (FWM) signal of bulk CdSe and interpreted in terms of non-Markovian exciton--LO-phonon scattering. The experiments show evidence of phonon quantum kinetics in semiconductors of strong polar coupling strength and high exciton b…
This report covers initial studies in the coaggregation of nickel (Ni2+) and lanthanide (Ln3+) metal ions to form complexes with interesting structural and magnetic properties. The tripodal amine phenol ligand H3tam (1,1,1-tris(((2-hydroxybenzyl)amino)methyl)ethane) is shown to be particularly accommodating with respe…
The temperature dependence of the luminescence intensity in nanocrystalline semiconductors, amorphous semiconductors, and chalcogenides has been reported to be of the Berthelot type $\mathrm{exp}{(T/T}_{B}),$ where ${T}_{B}$ is some characteristic temperature. A similar behavior has been reported for transport propert…
A series of molecular dyads, consisting of two homo- or heterodimetallic (M = M‘ = Zn II or M = Zn II, M‘ = Co II ) phthalocyaninato complexes bridged by mono- and bis-DEE [( E )-1,2-diethynylethene, ( E )-hex-3-ene-1,5-diyne] fragments, was prepared by Pd(0)-catalyzed cross-coupling reactions or by oxidative Glaser−H…
Accurate high-energy electron diffraction measurements of structure factors of NiO have been carried out to investigate how strong correlations in the Ni $3d$ shell affect electron charge density in the interior area of nickel ions and whether the ab initio approaches to the electronic structure of strongly correlated…
Ultrathin films of ZnS, Mn-doped ZnS, ZnO, and SiO 2 were grown on silicon substrates using surface sol−gel reactions, and the film growth process was characterized by ellipsometry, atomic force microscopy, X-ray photoelectron spectroscopy, UV−visible absorbance, and photoluminescence (PL) spectroscopy. The Si substra…
Complex microscopic structure is a common feature in biology; the mineral shells of single–celled aquatic plants and animals such as diatoms, coccolithophores, radiolaria, the organic coatings of pollen grains and the surfaces of many seeds are all familiar examples. To the human eye, viewing this exquisite complexity…
The reactions of potentially hexadentate H2bbpen (N,N'-bis(2-hydroxybenzyl)-N,N'-bis(2-pyridylmethyl)-ethylenediamine, H2L1), H2(Cl)bbpen (N,N'-bis(5-chloro-2-hydroxybenzyl)-N,N'-bis(2-pyridylmethyl)ethylenediamine, H2L2), and H2(Br)bbpen (N,N'-bis(5-bromo-2-hydroxybenzyl)-N,N'-bis(2-pyridylmethyl)ethylenediamine, H2L…
A new switching molecular array that interconverts reversibly either by thermal means (valence tautomerism) or by a reversible oxidation process has been established. Such an array is based on the rich electrochemical behavior of the cobalt Schiff base complex 2. The Schiff base ligand can exist in different oxidation…
The dielectric response of pulsed laser ablated barium strontium titanate thin films were studied as a function of frequency and ambient temperature (from room temperature to 320 °C) by employing impedance spectroscopy. Combined modulus and impedance spectroscopic plots were used to study the response of the film, whi…
Here we report the observation of a linear carbon-atom chain, synthesized using an arc discharge from a graphite double anode. We use high-resolution TEM to evidence the formation of a carbon-atom chain along the axis of a needlelike structure consisting of concentric cylindrical graphitic shells. The atomic chain in…
First-principles molecular orbital calculations using model clusters are made in order to reproduce and interpret experimental electron-energy-loss near-edge structure and near-edge x-ray absorption fine structure of MgO at Mg K, ${L}_{2,3}$ and O K edges. Ground-state calculations using a model cluster composed of 12…
Polydisperse brushes obtained by reversible radical chain polymerization reaction onto a solid substrate with surface-attached initiators are studied by means of an off-lattice Monte Carlo algorithm of living polymers (LP). Various properties of such brushes, like the average chain length and the conformational orient…
Oxidative stress has been implicated as a primary cause of neuronal death in certain neurodegenerative disorders and in aging brains. Natural products have been used in Asian societies for centuries for treating such neurodegenerative disorders as senile dementia. In an effort to identify active neuroprotective compou…