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。
There has recently been a surge of interest in the properties and applications of monolayer protected clusters (MPCs). MPCs are metal nanoparticles that have unique optical, chemical, and electrochemical properties resulting from their small size. Because the size defines their properties, MPC particle size fractionat…
[structure: see text] Dendrimers are attractive scaffolds for catalysis, since catalytic sites can be isolated and the catalysts are recoverable and reusable. Herein, we show that conformationally constrained molecules have better access to dendritic cores compared to the more flexible counterparts. The results report…
The ablation of polytetrafluoroethylene (PTFE) is studied using a continuous CO 2 laser beam of 30–50 W at a mean intensity of 0.05–50 MW m −2 . The ablation products and changes in the target layer are examined using infrared spectroscopy, x-ray photoelectron spectroscopy, x-ray diffraction and electron microscopy. T…
Abstract Two novel diamine monomers, 1,4‐bis (4‐aminophenoxy)‐2‐[(3′,5′‐ditrifluoromethyl)phenyl]benzene and 1,4‐bis [2′‐cyano‐3′(4″‐amino phenoxy)phenoxy]‐2‐[(3′,5′‐ditrifluoromethyl)phenyl] benzene, were synthesized from (3,5‐ditrifluoromethyl)phenylhydroquinone. A series of ditrifluoromethylated aromatic polyimides…
In situ x-ray diffraction demonstrates that in ultrafine grained Ni synthesized by high pressure torsion with a coherent scattering domain size of 80nm, a dislocation network is still built up during tensile deformation whereas this is not the case for electrodeposited nanocrystalline metals with a coherent scattering…
A Comment on the Letter by O. V. Gendelman and A. V. Savin, . The authors of the Letter offer a Reply.Received 6 April 2004DOI:https://doi.org/10.1103/PhysRevLett.94.219404©2005 American Physical Society
Abstract Two series of terpolymers, one of o ‐/ m ‐toluidine and aniline with o ‐aminobenzoic acid and the other of o ‐/ m ‐toluidine and aniline with m ‐aminobenzenesulfonic acid, have been synthesized by oxidative polymerization via an emulsion method with ammonium persulfate as the oxidant and HCl as the external d…
In this paper, we present theoretical investigations of the electronic and magnetic properties of the ordered ferromagnetic Ga0.75Mn0.25N and Al0.75Mn0.25N in zinc-blende structure using all electron full-potential (linear) augmented plane waves plus local orbitals calculations within the density functional theory and…
A granular assembly composed of a collection of identical grains may pack under different microscopic configurations with microscopic features that are sensitive to the preparation history. A given configuration may also change in response to external actions such as compression, shearing etc. We show using a mechanic…
This study investigated and correlated physical properties and cell interactions of copolymers obtained by a poly(ethylene glycol) (PEG)-modulated fermentation of Azotobacter vinelandii UWD. PEGs with molecular weights of 400 and 3400 Da and di(ethylene glycol) (DEG) were used to modulate the bacterial synthesis of po…
Contrast simulation of scanning electron microscope (SEM) images for particle–matrix systems is important for understanding the contrast formation mechanism in such systems. Most of the previous works have been limited to backscattered electron (BSE) signals because of the difficulties involved in the simulation of th…
We report a novel magnetic phenomenon consisting of the formation of helical spin configurations during the magnetization of densely packed ferromagnetic nanowires encapsulated inside carbon nanotubes. We studied the hysteresis loops when the magnetic fields are applied parallel and perpendicular to the nanotubes axes…
Indium tin oxide (ITO) thin films were deposited on glass substrates using the e-beam evaporating technique. The influence of deposition rate and post-deposition annealing on the optical properties of the films was investigated in detail. It is found that the deposition rate and annealing conditions strongly affect th…
Anodic aluminium oxide (AAO) templates for multi-walled carbon nanotube (MWCNT) growth were produced by anodization of aluminium followed by pulse-reverse electrodeposition of cobalt inside the AAO pores. Cobalt functioned as the catalyst for H 2 /C 2 H 2 chemical vapour deposition (CVD) growth of fairly well graphiti…
DFT (B3LYP as well as a number of common exchange-correlation functionals) predicts a low-spin Fe(IV) ground state for Fe(P)F2 (P = porphyrinato), whereas electrochemical evidence has apparently indicated an Fe(III) porphyrin π-cation radical formulation for such a species. Ab initio CASPT2 calculations favor a high-s…
The ultrasonic disinfection of Escherichia coli was carried out in the presence of anatase-type TiO2 particles, and the effectiveness of the combination of ultrasonic irradiation with TiO2 addition was verified. The rate constant was determined from the plot of the common logarithm of the survival cell ratio versus th…
A metal-catalyst-free growth method of carbon nanotubes (CNTs) has been developed using chemical vapor deposition of CNTs on carbon-implanted SiGe islands on Si substrates. From scanning electron microscopy and Raman measurements, the fabricated CNTs are identified as single-walled CNTs with a diameter ranging from 1.…
XPF and ERCC1 exist as a heterodimer to be stable and active in cells and catalyze DNA cleavage on the 5'-side of a lesion during nucleotide excision repair. To characterize the specific interaction between XPF and ERCC1, we expressed the human ERCC1 binding domain of XPF (XPF-EB) and the XPF binding domain of ERCC1 (…
We report resonant x-ray scattering data of the orbital and magnetic ordering at low temperatures at the Mn ${L}_{2,3}$ edges in ${\mathrm{La}}_{0.5}{\mathrm{Sr}}_{1.5}\mathrm{Mn}{\mathrm{O}}_{4}$. The orderings display complex energy features close to the Mn absorption edges. Systematic modeling with atomic multiplet…
This letter presents an approach to engineer the band structure of carbon nanotube field-effect transistors via selected area chemical gating. By exposing the center part, or the contacts, of nanotube devices to oxidizing or reducing gases, a good control over the threshold voltage and subthreshold swing has been achi…