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101.
CÉ Guinto Gamys Emmanuel Beyou Elodie Bourgeat‐Lami Pierre Alcouffe Laurent David 《Journal of polymer science. Part A, Polymer chemistry》2011,49(19):4193-4203
ABA‐based triblock copolymers of styrene as block ends and gelable 3‐acryloxypropyltriethoxysilane (APTES) as the middle block were successfully prepared through nitroxide‐mediated polymerization (NMP). The copolymers were bulk self‐assembled into films and the degree of phase separation between the two blocks was evaluated by differential scanning calorimetry (DSC). Their morphology was examined through small angle X‐ray scattering (SAXS) and transmission electron microscopy (TEM), whereas the mechanical properties of the corresponding cross‐linked self‐assembled nanostructures were characterized by dynamic mechanical analysis (DMA). Acidic treatment of the triblock copolymers favored the hydrolysis and condensation reactions of the APTES‐rich nanophase, and induced a mechanical reinforcement evidenced by the increase of storage modulus values and the shift of the glass transition temperature to higher temperatures due to confinement effects. In addition, the lamellar structure of the hybrid films was retained after the removal of the organic part by calcination. © 2011 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem, 2011 相似文献
102.
103.
Anxolabéhère-Mallart E Costentin C Fournier M Nowak S Robert M Savéant JM 《Journal of the American Chemical Society》2012,134(14):6104-6107
Electrochemical investigation of a boron-capped tris(glyoximato)cobalt clathrochelate complex in the presence of acid reveals that the catalytic activity toward hydrogen evolution results from an electrodeposition of cobalt-containing nanoparticles on the electrode surface at a modest cathodic potential. The deposited particles act as remarkably active catalysts for H(2) production in water at pH 7. 相似文献
104.
El Ghachtouli S Guillot R Aukauloo A Dorlet P Anxolabéhère-Mallart E Costentin C 《Inorganic chemistry》2012,51(6):3603-3612
We recently reported on the synthesis of a new pentadentate N(4)O ligand, tBuL(-), together with the X-ray diffraction structure of the corresponding mononuclear manganese(III)-hydroxo complex namely [(tBuL)Mn(III)OH](ClO(4)), (1 (ClO(4))). [El Ghachtouli et al. Energy Environ. Sci. 2011, 4, 2041.] In the present work, we evidence through electrochemical analysis that complex 1(+), in the presence of water, shows a peculiar behavior toward electron-transfer kinetics. The synthesis, single-crystal X-ray diffraction, and EPR spectroscopic characterization of two other mononuclear manganese(III)-chlorido and methoxo complexes-namely, [(tBuL)Mn(III)Cl](PF(6)), (2(PF(6))) and [(tBuL)Mn(III)OMe](ClO(4)), (3(ClO(4)))-are also reported. 2(PF(6)) and 3(ClO(4)) compounds will serve as reference complexes for the electron-transfer kinetics investigation. The peculiar behavior of 1(ClO(4)) is attributed to the specificity of hydroxide anion as ligand presumably allowing intermolecular hydrogen-bonding interactions and thus affecting electron-transfer properties. 相似文献
105.
Elodie Carsalade Alain Bernès Colette Lacabanne Sophie Perraud Michel Lafourcade Michel Savignac 《Journal of Thermal Analysis and Calorimetry》2010,101(3):849-857
The correlations between the transitions and the dielectric relaxation processes of the oriented poly(ethylene terephthalate)
(PET) pre-impregnated of the polyester thermoplastic adhesive have been investigated by differential scanning calorimetry
(DSC) and dynamic dielectric spectroscopy (DDS). The thermoplastic polyester adhesive and the oriented PET films have been
studied as reference samples. This study evidences that the adhesive chain segments is responsible for the physical structure
evolution in the PET-oriented film. The transitions and dielectric relaxation modes’ evolutions in the glass transition region
appear characteristic of the interphase between adhesive and PET film, which is discussed in terms of molecular mobility.
The storage at room temperature of the adhesive tape involves the heterogeneity of the physical structure, characterized by
glass transition dissociation. Thus, the correlation between the transitions and the dielectric relaxation processes evidences
a segregation of the amorphous phases. Therefore, the physical structure and the properties of the material have been linked
to the chemical characteristics. 相似文献
106.
Gustavsson T Bányász A Lazzarotto E Markovitsi D Scalmani G Frisch MJ Barone V Improta R 《Journal of the American Chemical Society》2006,128(2):607-619
The excited-state properties of uracil, thymine, and nine other derivatives of uracil have been studied by steady-state and time-resolved spectroscopy. The excited-state lifetimes were measured using femtosecond fluorescence upconversion in the UV. The absorption and emission spectra of five representative compounds have been computed at the TD-DFT level, using the PBE0 exchange-correlation functional for ground- and excited-state geometry optimization and the Polarizable Continuum Model (PCM) to simulate the aqueous solution. The calculated spectra are in good agreement with the experimental ones. Experiments show that the excited-state lifetimes of all the compounds examined are dominated by an ultrafast (<100 fs) component. Only 5-substituted compounds show more complex behavior than uracil, exhibiting longer excited-state lifetimes and biexponential fluorescence decays. The S(0)/S(1) conical intersection, located at CASSCF (8/8) level, is indeed characterized by pyramidalization and out of plane motion of the substituents on the C5 atom. A thorough analysis of the excited-state Potential Energy Surfaces, performed at the PCM/TD-DFT(PBE0) level in aqueous solution, shows that the energy barrier separating the local S(1) minimum from the conical intersection increases going from uracil through thymine to 5-fluorouracil, in agreement with the ordering of the experimental excited-state lifetime. 相似文献
107.
108.
Terephthalic acid can be readily converted to the corresponding monoalkyl terephthalate in high yield, via a two‐step procedure. This method is advantageously compared to the more representative methods described in the literature. The purification of the expected monoester, a crucial problem for this synthetic pathway, is discussed, and an original procedure has been developed. 相似文献
109.
Jean‐Marc Noel Nikolaos Kostopoulos Clia Achaibou Claire Fave Elodie Anxolabhre‐Mallart Frdric Kanoufi 《Angewandte Chemie (International ed. in English)》2020,59(38):16376-16380
Herein we report the first example of using scanning electrochemical microscopy (SECM) to quantitatively analyze O2 reductive activation in organic media catalyzed by three different Fe porphyrins. For each porphyrin, SECM can provide in one single experiment the redox potential of various intermediates, the association constant of FeII with O2, and the pKa of the FeIII(OOH?)/ FeIII(OO2?) couple. The results obtained can contribute to a further understanding of the parameters controlling the catalytic efficiency of the Fe porphyrin towards O2 activation and reduction. 相似文献
110.
Mattio Elodie Lamadie Fabrice Rodriguez-Ruiz Isaac Cames Beatrice Charton Sophie 《Journal of Radioanalytical and Nuclear Chemistry》2020,323(2):965-973
Journal of Radioanalytical and Nuclear Chemistry - The use of microfluidics technology and the miniaturization of analytical techniques is of high interest for the chemical and nuclear industries.... 相似文献