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 charge transport properties of the low-dimensional thermoelectric materials K2Bi8−xSbxSe13 (0<x⩽8) were studied as a function of temperature and composition. The Seebeck coefficient shows an evolution from n- to p-type character with increasing incorporation of Sb, and at the same time the temperature depen…
La-substituted Bi 1− x La x FeO 3 films have been prepared on LaNiO 3 /SiO 2 /Si(1 1 1) substrates by the sol–gel process. The films with x = 0.00–0.20 were prepared at an annealing temperature of 600 °C. X-ray diffraction patterns indicate that all films adopt R3m structure and different orientation with the increase…
Polycrystalline $\mathrm{Ba}\mathrm{Co}{\mathrm{O}}_{3}$ was synthesized by a citrate technique using thermal treatments at high oxygen pressure. Magnetic susceptibility measurements were carried out at very low ac and dc fields on the compound. The magnetic properties of the material between 14 and $30\phantom{\rule{…
We have investigated the defect structure in pure Co-doped and (Co, Nb)-doped TiO2 (anatase) thin films grown by pulsed laser deposition on (001) single crystal LaAlO3. Although both films exhibit room temperature ferromagnetism, dilute Nb doping significantly improves the conductivity and microstructure of the TiO2 (…
A screen-printed carbon nanotube (CNT) paste for applications to field emission emitters was treated with He, He∕Ar, and He∕N2 atmospheric pressure plasmas. The effect of the different plasma treatments on the field emission characteristics of the screen-printed CNTs was investigated. The atmospheric pressure plasma a…
The ionic liquid crystal [C12-mim]Cl has been doped with 5 mol% europium nitrate and the photophysical properties of both the ionic liquid and the trivalent europium ion have been monitored with respect to temperature in the range of −48 to +120 °C. The relative transition probabilities to the various ligand-field sub…
We report the combined measurements of the dc susceptibility ${\ensuremath{\chi}}_{0}$, the ac susceptibility ${\ensuremath{\chi}}^{\ensuremath{'}}$, and the NMR relaxation rate ${T}_{1}^{\ensuremath{-}1}$ for the molecular-based heterometallic single-chain magnet ${[\mathrm{Mn}(\text{saltmen})]}_{2}[\mathrm{Ni}{(\mat…
Density functional theory (DFT) at the hybrid B3LYP level has been applied to Ge(12)(z) bare germanium clusters (z = -6, -4, -2, 0, +2, +4, +6) starting from 11 initial configurations. The Wade-Mingos rules are seen to have limited value in rationalizing the results since they frequently require vertex degrees higher…
Diffraction gratings and reactive ion etching textures have been proposed as a way to enhance the optical performance of solar cells. Extensive calculations have been carried out to investigate the influence of depth-to-period ratio of triangular and rectangular gratings on front reflectance. Losses are quantified by…
OBJECTIVES: Autologous vein grafts are still widely used, but their long-term patency is suboptimal. The objective of the current study was to determine whether wrapping a vein graft in gelatin hydrogel sheet incorporating basic fibroblast growth factor improves their mechanical and physiological properties. METHODS A…
p‐Xylylene diazide (XDA) and dipropargyl ether of bisphenol A (DPEBPA) were synthesized and then a novel polytriazole, poly(4,4′‐(propane‐2,2‐diyl) diphenyl‐oxy‐methylene‐1,5 (and 1,4)‐(1,2,3‐triazole)‐p‐xylene), was prepared from XDA and DPEBPA by 1,3‐dipolar cycloaddition polymerization and characterized by FTIR, 1H…
A novel chemical modification method of acrylic fiber was employed by grafting of casein—a natural polymer, onto the surface of acrylic fiber. The effects of reaction conditions, such as chlorination time, chlorination temperature, grafting time and temperature, and pH value on grafting efficiency were investigated sy…
Modified fumed silica-epoxy nanocomposites were obtained by refluxing epoxy molecule with fumed silica using imidazole as catalyst. The modified fumed silica was then used as filler in epoxy resin with amine as curing agent. The properties of the surface modified silica and their effect as fillers in bulk epoxy compos…
A comprehensive treatment of the limitations and possibilities for single-pulse selection in synchrotron operating modes with approximately 150 ns bunch separation, as occurs in the standard operating mode at the Advanced Photon Source, is presented. It is shown that the strength of available materials and allowable k…
C 70 peapods (C 70 @SWCNT) have been studied for the first time under chemical and electrochemical doping by in situ Raman spectroelectrochemistry. The bleaching of Raman features of single-walled carbon nanotubes (SWCNT) and the downshift of the frequency of their tangential mode confirmed the strong chemical doping…
The equilibrated grain boundary groove shapes for commercial purity pyrene (PY) were directly observed by using a temperature gradient stage. From the observed grain boundary groove shapes, the Gibbs-Thomson coefficient and solid-liquid interfacial energy of PY have been determined to be (8.9±0.9)×10−8Km and (21.9±3.3…
Chitosan is a natural based polymer obtained by alkaline deacetylation of chitin, exhibiting excellent properties such as non‐toxicity, biocompatibility and biodegradability. N‐Methylenephenyl phosphonic chitosan (NMPPC) is synthesized from chitosan by reacting with phenyl phosphonic acid using formaldehyde. The NMPPC…
Abstract New photocrosslinkable maleimide copolymers have been synthesized by the attachment of a tricyanopyrrolidene‐based chromophore. The 2‐(3‐cyano‐4‐(2‐{4‐[hexyl‐(6‐hydroxy‐hexyl)‐amino]‐phenyl}‐vinyl)‐5‐oxo‐1‐{4‐[4‐(3‐oxo‐3‐phenyl‐propenyl)‐ phenoxy]‐butyl}‐1,5‐dihydro‐pyrrol‐2‐ylidene)‐malononitrile chromophore…
Recent research progress using X-ray cryo-crystallography with the photon beams from third-generation synchrotron sources has resulted in recognition that this intense radiation commonly damages protein samples even when they are held at 100 K. Other structural biologists examining thin protein crystals or single part…
Understanding how impurities such as nitrogen are included in diamond nanoparticles is expected to be important for use in future nanodevices, such as qubits for quantum computing. Most commercial diamond nanoparticles contain approximately 2-3% nitrogen, but it is difficult to determine experimentally whether it is l…