共查询到20条相似文献,搜索用时 46 毫秒
1.
H. P. Zhang L. C. Yang L. J. Fu Q. Cao D. L. Sun Y. P. Wu R. Holze 《Journal of Solid State Electrochemistry》2009,13(10):1521-1527
Recent progress in studies of several types of core-shell structured electrode materials, including TiO2/C, Si/C, Si/SiO
x
, LiCoO2/C, and LiFePO4/C nanocomposites, including details of their preparation and their electrochemical performance is briefly reviewed. Results
clearly show that the coating shell can effectively prevent the aggregation of the nanosized cores, which are the electrochemically
active materials. In addition, the diffusion coefficients of lithium ions can be increased, and the reversibility of lithium
intercalation and deintercalation is improved. As a result, the cycling behavior is greatly improved. The reviewed results
suggest that core-shell nanocomposites are a good starting point for further development of new promising electrode materials.
相似文献
Y. P. WuEmail: |
R. Holze (Corresponding author)Email: |
2.
Renat R. Nazmutdinov Michael D. Bronshtein Dmitrii V. Glukhov Tamara T. Zinkicheva 《Journal of Solid State Electrochemistry》2008,12(4):445-451
Solvent dynamics effects on the electroreduction of [PtCl3(H2O)]− at a mercury electrode are explored in the framework of Sumi–Marcus model using an efficient computational scheme. According
to results of density functional calculations, the second electron transfer step may be regarded as rate controlling. The
nonmonotonous influence of solvent viscosity on the reaction rate is predicted and explained in terms of the saddle point
avoidance. The results of model calculations are employed to interpret experimental data reported earlier in the literature.
相似文献
Renat R. NazmutdinovEmail: |
3.
Fatemeh Hashemzadeh M. Mehdi Kashani Motlagh Amir Maghsoudipour 《Journal of Sol-Gel Science and Technology》2009,51(2):169-174
In this work, MnO2 nanostructure powders with different crystalline phases have been successfully prepared by hydrothermal and sol–gel methods.
The obtained products were characterized by XRD and SEM techniques and their crystallographic phases and morphological properties
compared. Results showed that α-MnO2, β-MnO2, and δ-MnO2 nanorods were synthesized by hydrothermal method and γ-MnO2 polymorph was obtained by sol–gel method.
相似文献
Amir MaghsoudipourEmail: |
4.
Attila Sipos Miklós Tóth Franziska K. U. Mueller Jochen Lehmann Sándor Berényi 《Monatshefte für Chemie / Chemical Monthly》2009,140(4):473-478
Abstract The synthesis of 4H-thiochromene derivatives of apomorphines, a novel class of isoquinoline alkaloid-related compounds, has been achieved by
different O-dealkylation methods applied on previously published heteroring-fused aporphinoids. Detailed DFT study has been presented
regarding the mechanism of the L-selectride-mediated multiple O-dealkylation of a seven-ring aporphine analogue. Dopamine-binding tests confirmed the essential function of 11-hydroxy moiety
of the aporphine skeleton and revealed a remarkable D1 over D2 specificity for the derivative having the 4H-thiochromene ring system attached to positions 2 and 3 of the aporphine backbone.
Graphical Abstract
相似文献
Attila SiposEmail: |
5.
T. N. Drebushchak M. A. Mikhailenko V. A. Drebushchak E. V. Boldyreva 《Structural chemistry》2007,18(4):449-456
The paper summarizes recent results on crystallization and characterization of two polymorphs of the sulfathiazole:pyridine
(1:1) adducts with substantially different space groups (P41 and P21/c) and packing. Intermolecular interactions in the adducts are compared. These two forms were obtained from solutions containing
different ratios of n-propanol, not participating directly in crystallization but obviously controlling the polymorphism, and pyridine. The adducts
are also formed by the contact of pure solid sulfathiazole (different polymorphs) with pyridine vapor. In air, the adducts
decompose giving initially the metastable polymorph I of sulfathiazole, and then the stable sulfathiazole-III.
相似文献
E. V. BoldyrevaEmail: |
6.
The compounds {[Fe(phen)3]2+(TCNQ–TCNQ)2−) · 2(CH3OH)} (FIWPRD), {[Fe(C5H5)(C5H4CH2NMe3)]+)(TCNQ−) (IKONOL), and {[Cu(1,4,5,12-tetraazacyclo-pentadecane)]2+(TCNQ−)2} (AVOJEA) were reported in the non-centrosymmetric space groups Cc (#9), Pna21 (#33), and P1 (#1). Examination of the several sets of atomic coordinates shows that the space groups are more likely to be C2/c (#15), Pnma (#63), and (#2), respectively. Confirmation of the centrosymmetric models requires access to the diffraction intensities; unfortunately
these are not in the public domain.
相似文献
Frank H. HerbsteinEmail: |
7.
Davorka Moslavac Forjan Marijana Vinković Darko Kontrec Andreja Lesac Vladimir Vinković 《Structural chemistry》2007,18(5):585-591
Doubling of resonances in NMR spectra of chiral selectors with naphthyl group attached to the tertiary amide nitrogen atom
has been noticed what revealed the presence of two isomers. To test the enantiorecognition ability of these chiral selectors
they are covalently bonded to the HPLC silica gel. Those kind of chiral stationary phases were compared with analogous commercial
leucine chiral stationary phase. They exhibit the better enantioseparation results which indicate that the existence of cis/trans isomers does not have the negative influence on their enantioselective ability.
相似文献
Vladimir VinkovićEmail: |
8.
Kenichiro Todoroki Hidemichi Etoh Hideyuki Yoshida Hitoshi Nohta Masatoshi Yamaguchi 《Analytical and bioanalytical chemistry》2009,394(1):321-327
We have developed a novel pre-column fluorescence derivatization reagent for amines, F-trap pyrene. This reagent comprises
a fluorescent pyrene moiety, an amine-reactive Marshall linker, and a fluorophilic perfluoroalkyl group known as fluorous
tag. When the reagent reacts with aliphatic amines and amino acids to give fluorescent derivatives, the fluorous tag in the
reagent is eliminated simultaneously. Therefore, excess unreacted reagents in the derivatization reaction solution still have
the fluorous tag and could be removed by fluorous solid-phase extraction selectively before high-performance liquid chromatography
(HPLC) analysis. By using this reagent, 13 kinds of aliphatic amine (C2–C16) derivatives can be separated within 40 min by reversed-phase HPLC with gradient elution. In this chromatogram, unreacted
reagents peak at around 28 min, greatly decrease after fluorous solid-phase extraction, and do not interfere with the quantification
of each amine. The detection limits (S/N = 3) for examined aliphatic amines are 3.6–25 fmol per 20 μL injection. We have also applied this reagent successfully to
the amino acid analysis.
相似文献
Kenichiro TodorokiEmail: |
9.
X-ray structures of Diels–Alder adducts of thiophene with N-methylmaleimide and 2,5-dimethylthiophene with N-phenylmaleimide were determined and compared to literature data. In addition, quantum chemical calculations at various levels
of theory were used to study their molecular and electronic structure. A comparison with experimental results showed that
MP2/6-31G*, HF/6-311+G** and PBE1PBE/6-31G* methods give the most accurate structures.
相似文献
Davor MargetićEmail: |
10.
Lithiation of Ph2P(p-tolyl) followed by quenching with dichloromethane affords the new diphosphine Ph(p-tolyl)PCH2PPh(p-tolyl) as a mixture of syn and anti isomers. Upon crystallisation the anti isomer can be isolated relatively pure and reaction of this with [Mo(CO)4(piperidine)2] gives anti-[Mo(CO)4{Ph(p-tolyl)PCH2PPh(p-tolyl)}] which has been crystallographically characterised.
Electronic supplementary material The online version of this article (doi:) contains supplementary material, which is available to authorized users.
相似文献
Graeme HogarthEmail: |
11.
Ilana Abayev Arie Zaban Vladimir G. Kytin Alexey A. Danilin Germà Garcia-Belmonte Juan Bisquert 《Journal of Solid State Electrochemistry》2007,11(5):647-653
Results on the density of sates of nanostructured TiO2 as a function of particle size and temperature are reported. In TiO2 nanoparticles with a mean diameter 10 nm, the density of states (DOS) is strongly temperature-dependent, indicating a rearrangement
of the bandgap states in which the exponential energy parameter (width of the distribution) increases from 0.080 to 50 °C.
For nanoparticles with mean diameters of 20 and 30 nm the DOS is much closer to an exponential distribution, and is much less
sensitive to temperature variations. It is suggested that nanometer confinement has a significant influence on the density
of electronic states for 10-nm particles, while band tailing is similar to that occurring in bulk semiconductors for the larger
particles.
相似文献
Juan BisquertEmail: |
12.
Saad Alshehri John Burgess Colin D. Hubbard Christopher J. Jones Amit K. Das 《Transition Metal Chemistry》2008,33(4):417-420
The kinetics of substitution by alcohols and by aniline at [tris(3,5-dimethylpyrazolyl)hydroborato]molybdenum nitrosyl dihalides in toluene solution at 298.2 K and at atmospheric pressure
are reported and interpreted in terms of an associative mechanism.
相似文献
Colin D. HubbardEmail: |
13.
The molecular geometries, relative stabilities, binding energies, and dissociation energies of NaDyBr4 and its molecular ion are discussed. Both the bidentate and tridentate isomers are stable for the neutral species, while
only the bidentate form is stable for NaDyBr4
+.
相似文献
Magdolna Hargittai (Corresponding author)Email: |
14.
Hiroyuki Takeno Shin Nakazato Toshiaki Dobashi Masahiro Nobe Atsumi Wakabayashi 《Colloid and polymer science》2007,285(9):1029-1036
We investigated the self-assembling processes of solutions of poly(vinyl methyl ether) in mixed solvents of 2-butanone and
water with and without zirconium oxide (ZrO2) particles with average size of 75 nm during vaporization of the solvents by means of optical microscopy. The self-assembling
processes can be classified into three regimes: (1) early stage (nucleation and growth regime), (2) intermediate stage (regularly
arranged regime), and (3) late stage (aggregation and coalescence regime). In the intermediate stage, the water droplets,
including the ZrO2 particles, were regularly arranged with an almost constant spacing. The mechanism of the self-assembling processes is discussed
on the basis of experimental results.
相似文献
Hiroyuki TakenoEmail: |
15.
Sarah Gold Julian Eastoe Roberto Grilli David C. Steytler 《Colloid and polymer science》2006,284(11):1333-1337
A series of highly branched trichain sulfosuccinate surfactants have been synthesized and studied in condensed CO2 and aqueous environments. Aqueous critical micelle concentrations (CMCs) showed a general trend of increasing CMC with decreasing chain length, whereas increased branching appeared to increase solubility in CO2 and aid the dispersion of water. Near infrared spectra confirmed observed cloud with a large increase in solubility above the cloud pressures in this solvent.
相似文献
Julian EastoeEmail: Phone: +44-117-9289180Fax: +44-117-9251295 |
16.
J. M. D. Coey F. M. F. Rhen P. Dunne S. McMurry 《Journal of Solid State Electrochemistry》2007,11(6):711-717
There are suggestions in the electrochemical literature that a body force F
∇c acts when an electrolyte with a non-uniform concentration c of paramagnetic ions is subject to a uniform magnetic field. We demonstrate, experimentally and theoretically, that no such
magnetic body force exists, to first order. A second-order correction associated with the demagnetizing field does lead to
a very small concentration-dependent body force, which is not expected to produce any observable effect in electrochemistry.
Contribution to special issue on Magnetic field effects in Electrochemistry.
相似文献
J. M. D. CoeyEmail: |
17.
Nataliya V. Roznyatovskaya Veronika K. Laurinavichute Galina A. Tsirlina Vladimir M. Mirsky 《Journal of Solid State Electrochemistry》2007,11(7):981-992
Various systems containing immobilized binuclear copper(II) and nickel(II) complexes with Robson type ligand ([M2L]Cl2) are studied and compared in relation to catalysis of hydrogen peroxide reduction. Molecular complexes adsorbed on mercury
and gold, crystalline complexes immobilized in the carbon paste electrode, and complex species entrapped into polyphenol-modified
gold electrodes are considered. Electrocatalysis is assumed to result from the formation of H2O2–[M2L]Cl2 adduct, not from mediating redox transformations. Possible geometry of the formed reaction layers supporting adduct formation
is discussed.
相似文献
Nataliya V. RoznyatovskayaEmail: |
18.
In the present work, an important point concerning the NEMCA effect is addressed. We analyse the reasons why the changes in the work function of the gas exposed catalyst-electrode surface are one to one related to the changes in the catalyst working electrode potential E with respect to a reference electrode. It is concluded that this is due to the unique properties of the catalyst/solid electrolyte interface: the structure of the double layer in this region is very different from that in liquid electrolytes, being the potential difference at this interface mainly determined by the specific adsorption of the mobile species in the solid electrolyte.
相似文献
Ezequiel P. M. LeivaEmail: |
19.
Hinne Hettema 《Foundations of Chemistry》2008,10(2):135-142
Michael Weisberg’s recent 2007 paper on the chemical bond makes the claim that the chemical notion of the covalent bond is
in trouble. This note casts doubts on that claim.
相似文献
Hinne HettemaEmail: |
20.
Guy Yardeni Israel Zilbermann Eric Maimon Haim Cohen Dan Meyerstein 《Research on Chemical Intermediates》2009,35(4):543-554
A new CeIII complex was synthesized by mixing the ligand “dioxocyclam” with CeIII ions at pH 8.0 and its redox properties were investigated.
相似文献
Dan Meyerstein (Corresponding author)Email: |