A discrete Fe18‘molecular chain’
The use of a new O,N,N,O chelate has led to two new Fe6 and Fe18 molecular compounds, the latter with an unusual double-headed serpentine chain structure.
Materials Literature
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Direct synthesis of ordered mesoporous silica containing iodopropyl groups. A useful function for chemical modifications
In this paper, we report a clever approach permitting, in one step, the synthesis of ordered (hexagonal phase) mesoporous silica functionalized with iodopropyl groups [I(CH2)3] located in the pore channels. This material was obtained by the hydrolysis and co-condensation of tetraethylorthosilicate (TEOS) and iodopropy…
Effective and efficient photoluminescence of salicylate-ligating terbium( iii ) clusters stabilized by multiple phenyl–phenyl interactions
A luminescent nonanuclear terbium(III) hydroxo cluster, Tb(9)(Hesa)(16)(mu-OH)(10)(NO(3)) (Hesa: hexyl salicylate), stabilized by unique two-way phenyl ring interactions, pi-pi stackings (d = 3.482-3.599 A) and C-H-pi interactions (d = 2.75-3.03 A) between adjacent pairs of salicylates, was structurally characterized…
Carbon coatings for medical implants
Purpose: In this paper we report in vitro and in vivo results of Nanocrystalline Diamond Coatings which are used in medicine onto medical implants The very important property of carbon coatings is the protection living organism against the metalosis. Different medical implants with complicated shapes are covering by N…
Derivation of the Rayleigh-Plesset equation in terms of volume
The most common nonlinear equations of motion for the pulsation of a spherical gas bubble in an infinite body of liquid arise in the various forms of the Rayleigh-Plesset equation, expressed in terms of the dependency of the bubble radius on the conditions pertaining in the gas and liquid. However over the past few de…
METAL NANOCLUSTER COMPOSITE SILICATE GLASSES
Abstract. Composite materials made by metal clusters embedded in silicate glass matrices ex-hibit striking optical properties, interesting for photonic application, as well as important magnetic properties, such as superparamagnetism. These composites are also good candidates for appli-cation in catalysis and sensor t…
An analytical tool for understanding the properties and behaviour of variable charge soils
Routine analyses for soil cation exchange properties usually give only limited insight into the properties and management of soils containing significant amounts of variable charge. In this paper a procedure for determining a soil Charge Fingerprint is fully described, a model developed from simplified theory to under…
Time-resolved in situ XAS study of the preparation of supported gold clusters
Incipient-wetness impregnation of gamma-Al(2)O(3) with HAuCl(4) and subsequent removal of chlorine with NaOH, and deposition-precipitation of HAuCl(4) on TiO(2) at pH 7 resulted in supported Au(3+) species. Time-resolved in situ XAS at the Au L(3) edge showed that the Al(2)O(3)-supported oxidic or hydroxidic species w…
Structure and properties of multilayered siloxane–organic hybrid films prepared using long-chain organotrialkoxysilanes containing CC double bonds
Oriented multilayered films composed of alternating siloxane layers and organic layers were prepared from mixtures of tetramethoxysilane [Si(OMe)4] and unsaturated organotrimethoxysilane [RSi(OMe)3, where R is CH2CH(CH2)8– or CH2CH(CH2)2CHCH(CH2)4–], and the structures and macroscopic properties of the films were stud…
Sweet brushes and dirty proteins
We studied the protein repellency of dextran brushes. Dextran was grafted to a polystyrene surface in a broad range of grafting densities using polystyrene-dextran block copolymers and the Langmuir-Blodgett deposition technique. Ellipsometry measurements confirmed a successful transfer of the dextran brush from the ai…
Effect of artificial thermal aging on the crystallinity of XLPE insulation cables: X-ray study
X-ray diffraction has been applied to reveal the effect of thermal aging on the crystallinity variation of XLPE insulation cables. The changes in the crystalline phase of XLPE during aging at different temperatures have been analyzed. The carried out investigations pointed out that thermal aging at temperatures above…
Electrical properties of Er-doped CdS thin films
Cadmium sulfide thin films were prepared by chemical bath on glass substrates at 80°C. CdS was Er-doped during the growth process by adding water-diluted Er(NO3)33∙H2O to the CdS aqueous growing solution. The relative volume of the doping solution was varied in order to obtain different doping levels. The crystalline…
Angle-resolved annular data acquisition method for microellipsometry
An ellipsometric data acquisition method is introduced to measure the optical properties of sample. It is based on a microellipsometer hardware layout integrated a high numerical aperture objective lens, which is aligned in the normal direction of sample surface. This technique enables to achieve ellipsometric data at…
Photoinduced electron-transfer processes of carbon nanohorns with covalently linked pyrene chromophores: charge-separation and electron-migration systems
Carbon nanohorns (CNHs) have been covalently functionalized with pyrene chromophores forming dispersible nanohybrids in CH2Cl2. Their photo-physical properties have been investigated by complementary steady-state and time-resolved absorption and fluorescence spectroscopies as well as electrochemistry. Upon photo-excit…
Spatial distribution of lithium ions in glasses studied by 7Li{6Li} spin echo double resonance
This manuscript introduces 7Li{6Li} spin echo double resonance (SEDOR) spectroscopy as a novel approach for studying the spatial distribution of lithium ions in solid electrolytes. Theoretical simulations using density operator theory as well as experimental validation on the model compound lithium carbonate reveal th…
Superplasticity of Cu-Al-Mn-Ni Shape Memory Alloy
The microstructure and superplastic behavior at 450°C and 500°C in Cu-Al-Mn-based shape memory alloys were investigated using optical microscopy and a tensile test. It was found that a fine α (fcc) + β (bcc) two-phase structure with a grain size of 3 μm in diameter can be obtained in Cu-Al-Mn-Ni alloy by annealing at…
Synthesis of HMDI-based segmented polyurethanes and their use in the manufacture of elastomeric composites for cardiovascular applications
For short-term cardiovascular application, segmented polyurethanes (SPUs) based on 4,4-methylenebis(cyclohexyl isocyanate) (HMDI), polytetramethylenglycol (PTMG) and 1,4-butanediol (BD) were synthesized and characterized by spectroscopy (FT-IR, (1)H-NMR) and thermal (TGA, DMA, DSC) and mechanical techniques. The segme…
Fine structure of nacre revealed by solid state 13C and 1H NMR
Solid-state NMR investigations of nacre reveal the presence of an amorphous surface layer around the aragonite platelets. This surface layer contains hydrogen carbonate groups, presumably at its outer surface and water molecules slightly hindered in their mobility in a proton ratio of 1 : 33, i.e. about 16 water molec…
Multi-layered molecular charge-transfer salts containing alkali metal ions
The synthesis, crystal structure and physical properties of two new BEDT-TTF charge-transfer salts containing the tris(oxalato)ferrate(III) anion are described. The most commonly found tris(oxalato)metallate(III) salts of BEDT-TTF contain alternating layers of BEDT-TTF cations and tris(oxalato)metallate anions, but th…
Nucleotide-stabilized cadmium sulfide nanoparticles
Cadmium sulfide nanoparticles stabilized by both natural and unnatural 5′-nucleotide triphosphates were investigated to elucidate the specific chemical functionalities involved in the synthesis of emissive materials. The roles of the nucleobase functionalities in semiconductor nanocrystal synthesis are deconvoluted us…