Materials Literature
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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…
Ferroelectric materials, which have a reversible spontaneous polarization and generate an electric potential when subjected to a mechanical stress (piezoelectricity), have applications in nonvolatile random access memory devices and micro-electromechanical systems. For such applications, materials that remain ferroele…
Studies of current dynamics in solids have been hindered by insufficiently brief trigger signals and electronic detection speeds. By combining a coherent control scheme with photoelectron spectroscopy, we generated and detected lateral electron currents at a metal surface on a femtosecond time scale with a contact-fre…
We report many-body calculations of the self-energy and lifetime of Shockley and image states on the (100) and (111) surfaces of Cu that go beyond the $GW$ approximation of many-body theory. The self-energy is computed in the framework of the GWΓapproximation by including short-range exchange-correlation (XC) effects…
We report on surface effects on the electronic properties of interfaces in epitaxial LaAlO 3 /SrTiO 3 heterostructures. Our results are based on first-principles electronic structure calculations for well-relaxed multilayer configurations, terminated by an ultrathin LaAlO 3 surface layer. On varying the thickness of t…