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。
Flexible spacer chains are utilized to enhance the hybridization of terminally anchored oligonucleotide probes of DNA microarrays. A polymer physics approach identifies an underlying mechanism and yields guidelines for the optimal spacer length in terms of the effect on the equilibrium state. For low grafting densitie…
We study the guided self-assembly of symmetric/asymmetric diblock copolymer (BCP) films on heterogeneous substrates with chemically patterned surface by using a coarse-grained phase-separation model. During the procedure, the free energy employed for the BCP films was modeled by the Ginzburg-Landau free energy with no…
Abstract A bottom‐up fabrication route for PbTiO 3 nanograins grown on predefined TiO 2 nanostructures used as seeds is presented. The structuring of the TiO 2 seeds is performed using a self‐organized template constructed from a gold‐loaded micellar monofilm. With this fabrication process, TiO 2 seeds and PbTiO 3 gra…
We report on the time-dependent viscoelastic response of nanoblended films of a polyelectrolyte complex prepared by the multilayering method. The ion-pairing interactions within polyelectrolyte multilayers (PEMUs) are reversibly broken by adding salt to the electrolyte in which the PEMU is immersed. Thus, the bulk mod…
Magnetic transport properties in Ti(1-x)Co(x)O(2) and Zn(1-x)Co(x)O magnetic semiconductors have been studied experimentally and theoretically. A linear relation of lnρ versus T(-1/2) (ρ is sheet resistance and T is temperature), which shows different slopes and intersections at different magnetic fields, was observed…
The precise manipulation of network percolation, combined with the previously reported effects of the kinetics of cross-linking interactions, provide a mechanism by which to optimize the stimulus-responsive mechanical properties of supramolecular gels. Specific metal–ligand coordinative bonds create cross-links betwee…
Abstract Uniform nanocrystalline mesoporous mixed cobalt–nickel spinel phases displaying unimodal pores in the 7–12 nm range and relatively high specific surface areas up to 83 m 2 /g were prepared by a novel low temperature synthesis approach in which the desired metal oxide stoichiometries were introduced on a molec…
The relationship between Pt particle size and NO x storage performance has been investigated over a simple model Pt/BaO/Al 2 O 3 and an enhanced lean NO x trap catalyst (LNT). These catalysts were treated at elevated temperature to mimic the effect of thermal aging encountered during the desulfation step in NO x trap…
Abstract New complexes with guanazole (3,5‐diamino‐1,2,4‐triazole = Hdatrz), [Cu 2 (Hdatrz) 2 (μ‐OH 2 )(H 2 O) 4 (SO 4 )](SO 4 ) · 3.5H 2 O ( 1 ) and [Cu 3 (Hdatrz) 4 (μ‐Cl) 2 (H 2 O) 4 (SO 4 ) 2 ] · 11.4H 2 O ( 2 ), have been prepared and structurally characterized. Complex 1 is a noncentrosymmetric dinuclear compoun…
The synthesis of stable gold nanorods with higher aspect ratios (∼15–20) and more enhanced uniformity by a modified seed mediated growth approach is reported. A binary surfactant system consisting of CTAB and Pluronic F-127 was used to overcome limitations of the previous approach prepared in the presence of AgNO3: th…
Exposures to silica-containing dusts are associated with a risk of developing life-threatening lung diseases. However, the mechanism of silica toxicity is poorly understood. In this work the atomic structure of the surfaces of different silica polymorphs was determined, and a relationship with in vitro silica toxicity…
Abstract Nanometric ceria powders doped with 30 mol % samaria are consolidated by a high‐pressure spark plasma sintering (HP‐SPS) method to form > 99 % dense samples with a crystallite size as small as 16.5 nm. A conductivity dependence on grain size was noted: when the grain size was less than 20 nm, only one semi…
Working under pressure: BiB3O6 is a well-known material with nonlinear optical properties. The use of high-pressure/high-temperature conditions led to the synthesis of a new non-centrosymmetric bismuth triborate (δ-BiB3O6). The picture shows a six-membered ring in the crystal structure of δ-BiB3O6 (orange spheres: Bi,…
In-situ Sn-doped CdS thin films have been deposited successfully by the chemical bath deposition method using tartaric acid as a complexing agent. The films have been characterized by x-ray diffraction for structure determination, and microstructural parameters like crystallite size, rms strain and dislocation density…
Application of a voltage pulse having a rise time of tens of nanoseconds to electrodes immersed in water results in streamer development and the formation of a highly conductive plasma channel between the electrodes. The electrical resistance of such channels decreases rapidly from a few ohms to a few tens of milliohm…
In this work we study the structural and electronic properties of Be chalcogenides (BeS, BeSe and BeTe) using two different methods: the full-potential linear augmented-plane wave (FP-LAPW) and the plane-wave pseudopotential (PPsPW). The exchange-correlation effects are treated in the local-density approximation (LDA)…
We report the results of first-principles density functional theory calculations of the Young's modulus and other mechanical properties of hydrogen-passivated Si <001> nanowires. The nanowires are taken to have predominantly {100} surfaces, with small {110} facets. The Young's modulus, the equilibrium length and the r…
We investigate atomistic details of a single atom extraction process realized by using scanning tunneling microscope (STM) tip-cluster interaction on a Ag(111) surface at 6 K. Single atoms are extracted from a silver cluster one atom at a time using small tunneling biases less than 35 mV and a threshold tunneling resi…
The electronic structure in the new transition-metal carbide ${\mathrm{Ti}}_{4}\mathrm{Si}{\mathrm{C}}_{3}$ has been investigated by bulk-sensitive soft x-ray emission spectroscopy and compared to the well-studied ${\mathrm{Ti}}_{3}\mathrm{Si}{\mathrm{C}}_{2}$ and TiC systems. The measured high-resolution Ti $L$, C $K…
Zn1−xFexO films were prepared by the radio-frequency (rf) magnetron sputtering technique on n-Si substrates with a composite target of a ceramic polycrystalline ZnO containing several Fe pieces on the surface. X-ray photoelectron spectroscopy study of the Zn1−xFexO films shows that Fe in the as-deposited film exists m…