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。
A series of intrinsically fluorescent hydrophobic and amphiphilic polyphosphazenes with ethyl tryptophan (EtTrp) and poly(N-isopropylacrylamide) (PNIPAAm) or poly(ethylene glycol) (PEG) as hydrophobic and hydrophilic segments, respectively, are synthesized. Depending on polymer composition and preparation procedure, p…
Perovskite samples of the general formula La 0.1 A 0.9 Co y Fe 1- y O 3- δ (where A = Ca, Sr, Ba; y = 0.1, 0.5, 0.9) were synthesized in our laboratory. Further substitution of Sr to a small extent by Ag and complete substitution of La by Sr were also studied. For a fixed perovskite composition (SrCo 0.5 Fe 0.5 O 3- δ…
Ellipsometric porosimetry was used to determine the adsorption isotherms of toluene, methanol, and water on b-oriented Silicalite-1 coatings with a thickness of less than ca. 250 nm and to obtain adsorption kinetics. The adsorption isotherms are of sufficient quality to reveal several aspects of the pore structure suc…
Catalytic partial oxidation of methane (CPOM) at high-temperature, millisecond contact times ( T > 900 °C, τ = 1−50 ms) is a technologically interesting reaction pathway for the production of synthesis gas or hydrogen. While many studies on CPOM over noble metal catalysts have been published in the past 10 years, much…
Dendronized polymers containing a cellulose backbone have been synthesized with the aim of producing complex molecules with versatile functionalization possibilites and high molecular weight from biobased starting materials. The dendronized polymers were built by attaching premade acetonide-protected 2,2-bis(methylol)…
Measurements in acidic media and time-dependent density functional theory and DeltaSCF calculations were performed for Ru(bpy)2(CN)2 in 11 solvents of varying polarity to determine the solvent's influence on the absorption and emission spectra of the complex. The solvent effect caused by both the polarizable continuum…
The perchlorate complexes of manganese, nickel, and zinc with hexamethylenetetramine (HMTA) of the general formula [M(H2O-HMTA-H2O)2(H2O-ClO4)2(H2O)2] (where M=Mn, Ni, and Zn) have been prepared and characterized by X-ray crystallography. Thermal studies were undertaken using thermogravimetry (TG), differential therma…
New nanohybrids were synthesized by grafting organosilanes on silica nanoparticles. These nanohybrids containing dibipyridine, urea, and urethan functionalities can be used as new synthons for nanotechnology, catalysis, or nanocomposites. The influence of the organosilane amount was studied together with the pH and so…
We have developed a facile and direct procedure for the preparation of lanthanide chalcogenide nanocrystals (NCs) with controllable morphologies. Eu(II)S NCs were successfully obtained when protecting the reaction in inert environment, while opening the system to air resulted in lanthanide oxysulfide. Surface ligands…
Cooperativity between Brønsted acidic defect sites on oxide surfaces and Lewis acid catalyst sites consisting of grafted calixarene-Ti(IV) complexes is investigated for controlling epoxidation catalysis. Materials are synthesized that, regardless of the surface or calixarene substituent, demonstrate nearly identical U…
This paper is concerned with the vibration problem of initially stressed micro/nano-beams. The vibration problem is formulated on the basis of Eringen's nonlocal elasticity theory and the Timoshenko beam theory. The small scale effect is taken into consideration in the former theory while the effects of initial stress…
Thermal transitions of the three crystalline phases (γ, δ, and ε) of syndiotactic polystyrene (s-PS), presenting s(2/1)2 helices, have been compared by X-ray diffraction, differential scanning calorimetry (DSC), and dynamic-mechanical analyses. These analyses have been conducted on crystalline (δ and ε) films, obtaine…
Hepta(3,3,3-trifluoropropyl) polyhedral oligomeric silsesquioxane (POSS)-capped poly(ethylene oxide) (PEO) was synthesized via the reaction of hydrosilylation between hepta(3,3,3-trifluoropropyl)hydrosilsesquioxane and allyl-terminated PEO. The POSS-capped PEO was characterized by means of Fourier transform infrared (…
A novel perovskite oxide with the title composition has been prepared by soft-chemistry procedures followed by thermal treatments at 1000 °C. This polycrystalline sample has been characterized by temperature-dependent neutron powder diffraction (NPD), thermal analysis, electrical conductivity, and thermal expansion me…
Multi-walled carbon nanotubes (MWNTs) bearing hydroxyl groups (MWNTols) on the exterior surface have been synthesized by an alkaline-mediated hydrothermal treatment of MWNTs under autogenous pressure at 180 °C. X-Ray photoelectron spectroscopy shows that the content of hydroxyl groups increases with the concentration…
Cellulose derivatives having a cross-linkable mercapto group were prepared by esterification of cellulose acetate (CA) with mercaptoacetic acid. The molecular structure of a series of products (CA-MA) was characterized by (1)H and (1)H- (13)C HMQC NMR spectroscopy and gel permeation chromatography. The solubility of C…
By carefully controlling the reacting time, temperature, and humidity, we have prepared Co 3 O 4 nanowires by heating a pure cobalt foil in atmosphere. Scanning electronic microscopy demonstrates that the nanowires have a diameter ranging from 20 to 100 nm and their typical lengths are in the range of 10−20 μm. X-ray…
By changing ancillary tetradentate Schiff base ligands (L), two new one-dimensional azide-bridged manganese(III) coordination complexes [MnIII(L)(mu1,3-N3)]n [L = 5-Fsalen (1), 5-OCH3 (2); salen = N,N'-bis(salicylidene)-1,2-diaminoethane] as well as a mononuclear complex [MnIII(salophen)(N3)] (3) [salophen = N,N'-bis(…
Tb and Eu complexes of enantiopure ligands with a new modular design show strong overall luminescence and CPL activity in aqueous solution.
Multi-metal nanoparticles, particularly alloys and intermetallic compounds, are useful catalysts for a variety of chemical transformations. Supported intermetallic nanoparticle catalysts are usually prepared by depositing precursors onto a support followed by high-temperature annealing, which is necessary to generate…