Ашық рұқсат
Рұқсат берілді
Тек жазылушылар үшін
Том 470, № 2 (2016)
- Жылы: 2016
- Мақалалар: 5
- URL: https://journals.rcsi.science/0012-5008/issue/view/9233
Chemistry
New donor–acceptor copolymers with ultra-narrow band gap for photovoltaic application
Аннотация
Two novel donor–acceptor (D–A) copolymers P1 and P2 with the thiazoloquinoxaline repeating acceptor moiety and different donor moieties of benzo[1,2-b:4,5-b']dithiophene and isomeric benzo[2,1-b:3,4-b']dithiophene have been prepared. The polymers show light absorption at 300–1200 nm and a band gap width of 0.98 and 1.14 eV, respectively. The energies of the HOMO (–5.42 and–5.29 eV) and LUMO (–3.90 and–3.83 eV) levels of polymers P1 and P2 have been determined. The absorption maximum for polymer P1 in the long-wavelength region is red-shifted by 161 nm, which is caused by stronger charge transfer in P1 as compared with P2. This fact indicates that the benzo[1,2-b:4,5-b']dithiophene structural moiety has a higher electron-donating ability than the benzo[2,1-b:3,4-b']dithiophene moiety. The red shift of the absorption spectrum of polymer P1 in comparison with that of P2 indicates that interchain π–π stacking interactions are more efficient in P1 than in P2.
283-288
Polyarenes prepared by Suzuki–Miyaura reaction via condensation of sumanene and 3,4:9,10-perylenetetracarboxydiimide derivatives: Synthesis and chemical transformations
Аннотация
A sumanene-containing polyarene with side epoxy groups has been obtained for the first time by the sequential chemical transformations of initial polyarene. The latter was prepared by the condensation of diiodosumanene and diboryl derivative of perylenetetracarboxydiimide. The epoxy-containing polyarene can provide a basis for promising negative electron resist for 12-nanometer chip manufacturing technology.
289-292
Modeling of carbonaceous feedstock pyrolysis in a multichannel reactor
Аннотация
A mathematical model of unsteady-state carbonaceous feedstock pyrolysis in a multichannel tubular reactor was proposed. It was shown that the conversion of feedstock being heated at periodically varying temperature can exceed the conversion on heating at constant temperature. The main design parameters of the multichannel reactor were determined.
293-296
Electrochemical modification of steel by platinum nanoparticles
Аннотация
The aim of this study was to synthesize low-concentration catalysts with a highly developed surface based on nanodispersed platinum deposited onto the steel surface electrochemically modified with the use of an ionic liquid. Sintered fibers of austenitic steel without pretreatment (steel 1) and etched with hydrochloric acid to remove surface oxides (steel 2) were used as substrates. 1-Butyl-4-methylimidazolium acetate [BMIM][Ac] ionic liquid was used. Variation of the current intensity and anodic treatment time leads to the formation of different structures at the steel surface. For steel 2, optimal conditions leading to self-organization, namely, formation of hexagonal structures, have been selected. It has been demonstrated that formation of nanostructures at the steel surface can occur without the participation of fluoride ions. Low-concentration (Pt/steel 2) catalysts with a uniform distribution of platinum nanoparticles over the surface were prepared via galvanostatic deposition from an aqueous solution of H2PtCl6.
297-301
Chemical Technology
Optimal temperature conditions of carbonaceous feedstock pyrolysis
Аннотация
A problem of optimal control of the temperature conditions of carbonaceous feedstock pyrolysis in a plug-flow reactor was formulated, and it was shown that the optimal temperature profile depends significantly on the ratio between the activation energies of the desired and side reactions and also on the type of the main pyrolysis reactions (consecutive, parallel, or consecutive-parallel).
302-306