Materials Literature
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The electronic properties of deformed armchair carbon nanotubes are modeled using constraint free density functional tight binding molecular dynamics simulations. Independent from CNT diameter, deforming path can be divided into three regimes. In the first regime, the nanotube deforms with negligible force. In the sec…
Abstract Two new isostructural complexes, dibromobis(1‐ethyltetrazole)copper( II ) ( 1 ) and dibromobis(1‐hexyltetrazole)copper( II ) ( 2 ), have been synthesised. Each bromine atom in the crystal structure of 1 and 2 is bonded to two copper atoms to give rise to a polymeric corrugated network. The polymeric layers ar…
The role and the nature of the continuum in Surface Enhanced Raman Spectroscopy (SERS) are unclear. Here, two-dimensional (2D) covariance and correlation analysis is applied to single molecule SERS spectra on silver colloids with and without rhodamine 6G (native colloid). The resulting 2D covariance and correlation ma…
Polybromophenylsilsesquioxane (Br x OPS), where x = 5.3 ( p:m = 65:25), because of its octahedral structure and nanometer size, represents a potentially very useful nanoconstruction site. We report here that Br 5.3 OPS reacts readily with borates of phenyl, biphenyl, naphthyl, 9,9-dimethylfluorene, and thiophene using…
Abstoßende Filme: Stark wasserabweisende leitfähige Poly(alkylpyrrol)-Filme (Kontaktwinkel für Wasser über 150°) sind stabil gegenüber Erhitzen, organischen Lösungsmitteln und Ölen. Die Oberfläche der Filme hat eine fraktale Struktur aus senkrecht zueinander angeordneten Nadeln (siehe Bild; Einschub: Foto eines Wasser…
Abstract A series of oxomolybdate( V ) complexes with methanol was prepared by the reaction of (PyH) 5 [MoOCl 4 (H 2 O)] 3 Cl 2 ( 1 ) or (PyH)[MoOBr 4 ] (PyH + = pyridinium cation, C 5 H 5 NH + ) in methanol. (PyH) 2 [MoOCl 4 (MeOH)]Cl ( 2 ) is obtained upon substitution of coordinated water for methanol in 1 . Small…
Abstract A reference solutions for phase change involving convection in the melt is currently missing. In the present study, we focus on the problem of melting of pure tin in a square cavity heated from the side, which is used as a benchmark test problem. The mathematical model used for the simulations is based on the…
The new biodegradable chitosan graft copolymer, chitosan-g-polycaprolactone, was synthesized by the ring-opening graft copolymerization of epsilon-caprolactone onto phthaloyl-protected chitosan (PHCS) at the hydroxyl group in the presence of tin(II) 2-ethylhexanoate catalyst via a protection-graft-deprotection procedu…
Covalently imprisoned within pore walls of mesostructured porous silica, organophosphanyl transition-metal complexes (Z, see picture) are still able to effect heterogeneous hydrogenation catalysis. The key to the synthetic protocol that leads to the well-defined metal sites lies in silylation of the material prior to…
The synthesis of a novel family of heterobinuclear cofacial biphenylene (B), anthracene (A), 9,9-dimethylxanthene (X), or dibenzofuran (O) bridged porphyrin-corrole complexes, (PCY)MClCoCl, is reported, M being either an iron(III) or manganese(III) ion. Each complex was characterized by electrochemistry, mass spectrom…
Red, green, and blue emissions are observed simultaneously for an organoterbium complex that displays remarkable multiphoton upconversion when excited by a near-infrared light source. The system undergoes two nonlinear optics processes simultaneously: second and third harmonic generation (SHG: red emission; THG: blue)…
4 pages This work was supported by the CNRS, the Ecole Polytechnique and the Université Pierre et Marie Curie.
Highly dense arrays of titania nanoparticles were fabricated using surface micellar films of poly(styrene-block-2-vinylpyridine) diblock copolymers (PS-b-P2VP) as reaction scaffolds. Titania could be introduced selectively within P2VP nanodomains in PS-b-P2VP films through the binary reaction between water molecules t…
We present a systematic study of how growth of hydrogen-bonded multilayers is affected by the substrate shape and charge as well as by the deposition conditions of a polycation precursor layer. We contrast growth of strongly bound poly( N -vinylpyrrolidone)/poly(methacrylic acid) (PVPON/PMAA) and weakly bound poly(eth…
The effect of dopant concentration on the blue upconversion (UPC) emission of Tm(3+) -doped ZrO(2) nanocrystals under different excitation wavelengths in the red region is reported. The UPC emissions are due to the f-f electronic transitions from excited states (1)G(4) and (1)D(2) of Tm(3+). We observed a chromatic ch…
Abstract Mo VI complexes with the general formula [MoO 2 X 2 L] [X = Cl, Br; L = 4,4'‐dimethyl‐2,2'‐bipyridine (dmbp) or 4‐hexyl‐4'‐methyl‐2,2'‐bipyridine (hmbp)] have been prepared and characterized by IR and solution NMR ( 1 H, 13 C, 17 O and 95 Mo) spectroscopy. The complexes were applied as catalysts in the homoge…
We have demonstrated that a one-dimensional molecular assembly created by an H-aggregated porphyrin.Cu(II) stack can be immobilized, without a morphological change, by sol-gel polycondensation of the peripheral triethoxysilyl groups. The resultant gel prepared according to this flowchart has gained a very high thermal…
The influence of protein stability on the adsorption and desorption behavior to surfaces with fundamentally different properties (negatively charged, positively charged, hydrophilic, and hydrophobic) was examined by surface plasmon resonance measurements. Three engineered variants of human carbonic anhydrase II were u…
ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTSingle Component Chitosan Hydrogel Microcapsule from a Layer-by-Layer ApproachYongjun Zhang, Ying Guan, and Shuiqin ZhouView Author Information Department of Chemistry and Center for Engineered Polymeric Materials at College of Staten Island, and The Institute for Macromolecula…
A new strategy for the heterogenization of chiral titanium complexes was developed by the in situ assembly of bridged multitopic BINOL ligands with [Ti(OiPr)4] without using a support. The assembled heterogeneous catalysts (self-supported) showed excellent enantioselectivity in both the carbonyl-ene reaction of alpha-…