| 1. |
- Galkin, M. V., et al.
(författare)
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Thermal lens spectrometry for the synthesis and study of nanocomposites on the basis of silver salts absorbed by a polyacrylate matrix
- 2010
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Ingår i: Moscow University Chemistry Bulletin. - : Allerton Press. - 0027-1314 .- 1935-0260. ; 65:2, s. 91-97
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Tidskriftsartikel (refereegranskat)abstract
- Thermal lens spectrometry is applied to determine the absorption of transparent nanocomposite materials, which are produced by the thermal decomposition of silver salts absorbed in the bulk of a polymethacrylate matrix. The high spatial resolution of determination, corresponding to the size of laser beams, makes it possible to evaluate the homogeneity for the distribution of coloration in the matrix. The advantages of thermal lens spectrometry over spectrophotometry include the weak effect of sample scattering on the results of its absorption determination and a higher sensitivity of determination, which may exceed that of spectrophotometry by one or two orders of magnitude. The possibility of achieving local syntheses of nanosized particles in the bulk of the matrix by virtue of the photoinduced decomposition of silver salts in initial polyacrylate materials is shown. Thermal lens experiments also allow the combination of the synthesis of silver nanoparticles and control of the absorbance for the prepared structural units.
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| 2. |
- Cherepov, Sergiy, et al.
(författare)
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Core-Core Dynamics in Spin Vortex Pairs
- 2012
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Ingår i: Physical Review Letters. - 0031-9007 .- 1079-7114. ; 109:9, s. 097204-
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Tidskriftsartikel (refereegranskat)abstract
- We investigate nanopillars in which two thin ferromagnetic particles are separated by a nanometer thin nonmagnetic spacer and can be set into stable spin vortex-pair configurations. We find that the previously unexplored limit of strong vortex core-core coupling can dominate the spin dynamics in the system. We observe experimentally and explain analytically and numerically how the 0.2 GHz gyrational resonance modes of the individual vortices are transformed into a 2 GHz collective rotational resonance mode in the configurations where the two cores form a bound pair.
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| 3. |
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| 4. |
- Terenin, V. I., et al.
(författare)
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1-(Trifluoromethyl)-3,4-dihydropyrrolo-[1,2-a] pyrazines: synthesis and reactions with O- and N-nucleophiles
- 2011
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Ingår i: Chemistry of Heterocyclic Compounds. - : Springer Science and Business Media LLC. - 0009-3122 .- 1573-8353. ; 46:10, s. 1271-1278
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Tidskriftsartikel (refereegranskat)abstract
- The method of synthesis has been developed and reactions of 1-(trifluoromethyl)-3,4-dihydro-pyrrolo[1,2-a]pyrazines with O- and N-nucleophiles have been studied. It was found that reactions of nucleophiles with 1-(trifluoro-methyl)pyrrolo[1,2-a]pyrazines transforms the trifluoromethyl group to amide and amidine groups together with aromatization of the pyrrolo[1,2-a]pyrazine system as a result of the formal elimination of a molecule of hydrogen fluoride.
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