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 reactions of alcohols and alkenes with hydrogen-terminated silicon surfaces have been investigated using infrared spectroscopy and deuterium labeling of the reagents and the surface termination. Transmission FTIR spectra were obtained on samples of electrochemically grown porous silicon or mechanically abraded sil…
X-ray scattering measurements on water confined in the cylindrical pores of MCM-41 with different pore sizes C10 (diameter = 21 Å) and C14 (28 Å) have been performed over a temperature range of 223−298 K. Both samples were sealed in glass capillaries at relative water vapor pressures p / p 0 = 0.3 and 0.6 under monola…
Carbonyl ruthenium(II) 5,10,15-tris(4-R-phenyl)-20-(4-hydroxyphenyl)porphyrins (R = Cl, Me) covalently attached to Merrifield's peptide resin were prepared. The catalyst with R = Cl was found to efficiently catalyze Cl 2 pyNO epoxidation of a wide variety of alkenes, including aromatic and aliphatic terminal alkenes,…
An FTIR study of CO adsorption and oxidation on Au/TiO 2 is reported. At 90 K different CO− 18 O 2 interactions have been performed, with preadsorbed carbon monoxide or preadsorbed isotopically labeled oxygen, with dry or wet carbon monoxide. From the experimental results it can be inferred that (i) at 90 K carbon mon…
trans-(1R,2R)-1,2-Cyclohexanedi(11-aminocarbonylundecylpyridinium) hexafluorophosphate (1) was synthesized. The sol−gel polymerization of Ti[OCH(CH3)2]4 using compound 1 as a self-assembled template afforded fibrous TiO2 materials with a “macaroni”-like structure. The unique structure of TiO2 could be created by the f…
High-cell-density fed-batch cultures of Pseudomonas putida were carried out for the production of medium-chain-length polyhydroxyalkanoates (PHAs) using oleic acid as a carbon source. By employing an optimal feeding strategy without the limitation of any nutrient, a high cell concentration of 173 g/L was achieved, but…
A variety of linear and cross-linked polysiloxanes are transformed into silicon oxide (SiO x ) through the application of a recently developed room-temperature UV/ozone conversion process. Ozone and atomic oxygen, produced by exposure of atmospheric oxygen to ultraviolet radiation, remove organic portions of the polym…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTDetection of Fluorophosphonate Chemical Warfare Agents by Catalytic Hydrolysis with a Porous Silicon InterferometerHonglae Sohn, Sonia Létant, Michael J. Sailor, and William C. TroglerView Author Information Department of Chemistry and Biochemistry University of Califo…
We report an evaporation-induced self-assembly procedure to prepare poly(bridged silsesquioxane) thin-film and particulate mesophases that incorporate organic moieties ( 1−3 ) into periodic, mesostructured frameworks as molecularly dispersed bridging ligands. Capacitance−voltage measurements along with a variety of st…
The title reactions of ground-state lead atoms have been studied in isolation in an HTFFR (high-temperature fast-flow reactor) at pressures in the 10−150 mbar range. Pb consumption rate coefficients were determined using atomic resonance absorption spectrometry at 217.0 and 283.3 nm. The following results, in cm 3 mol…
Thermoreversible gelation of rodlike poly(γ-stearyl-α- l -glutamate) in n -dodecane has been studied by differential scanning calorimetry, polarized light microscopy, visual observations, and temperature ramped fluorescence photobleaching recovery. Solutions spanning a wide range of concentrations can produce gels. In…
The film structure, composition, and deposition kinetics of model Ziegler−Natta polymerization catalysts produced by chemical vapor deposition have been studied using temperature-programmed desorption (TPD), Auger electron spectroscopy (AES), and X-ray photoelectron spectroscopy (XPS). Redox reactions of metallic Mg a…
Structural organization of a carbosilane liquid crystalline dendrimer of fifth generation with cyanobiphenyl mesogenic groups in the 25−130 °C range was examined by atomic force microscopy (AFM). Studies were performed on the dendrimer films of different thicknesses, from single macromolecular layers to films several…
The synthesis and characterization of new selenium coronands and of copper(I) and copper(II) complexes of selenium coronands are reported. Molecular structures in the solid state have been determined by X-ray crystallography. The molecular structures of 6,7,13,14-dibenzo-1,5,8,12-tetraselenacyclotetradecane (dibenzo-1…
The rehydration of potassium acetate-intercalated kaolinite has been followed using a combination of X-ray diffraction and Raman microscopy. Dehydration of the fully expanded potassium acetate-intercalated kaolinite with initial d (001) spacing of 13.88 Å, in an atmosphere of nitrogen, shows the presence of three expa…
Niobium oxide supported Pd−Co catalysts were characterized through XPS (X-ray photoelectron spectroscopy), (XPS), temperature-programmed reduction (TPR), magnetic measurements, X-ray diffraction, and extended X-ray absorption fine structure (EXAFS). XPS analyses suggested the presence of Co 3 O 4 particles and Co 2+ s…
A nanometer-sized signal-responsive gate was fabricated by self-assembly of ionizable polypeptide brushes on a gold-coated porous membrane, and its responsiveness in water was visualized by atomic force microscopy. The gating was regulated by the conformational change of poly(glutamic acid) that undergoes a helix−coil…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTComplex Formation between Poly(dimethylsiloxane) and Cyclodextrins: New Pseudo-Polyrotaxanes Containing Inorganic PolymersHiromichi Okumura, Miyuko Okada, Yoshinori Kawaguchi, and Akira HaradaView Author Information Department of Ma…
We study the effect of interface disorder on the spin-dependent interface resistances of Co/Cu, Fe/Cr and Au/Ag multilayers using a newly developed method for calculating transmission matrices from first-principles. The efficient implementation using tight-binding linear-muffin-tin orbitals allows us to model interfac…
The Airy gas model of the edge electron gas is used to construct an exchange-energy functional which is an alternative to those obtained in the local density and generalized gradient approximations. Test calculations for rare gas atoms, molecules, solids and surfaces show that the Airy gas functional performs better t…