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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Ivanova O. S., Edel'man I. S., Sventitsky E. S., Serdyuk A. A., Toropova E. S.
Заглавие : Adsorption and Catalytic Properties of Nanoparticles Fe3O4-Ag in Relation to Various Types of Organic Dyes
Коллективы : "Mechanisms of catalytic reactions", International conference, "Механизмы каталитических реакций", международная конференция, Институт катализа им. Г.К. Борескова Сибирского отделения РАН, Институт органической химии им. Н.Д. Зелинского РАН, Московский государственный университет им. М.В. Ломоносова, Сибирское отделение РАН, Центр компетенций НТИ "Водород как основа низкоуглеродной экономики"
Место публикации : XII lnternational conference "Mechanisms of catalvtic reactions": abstracts. - Novosibirsk, 2024. - Ст.PP-09. - P.174-175. - ISBN 978-5-906376-56-5
Примечания : Библиогр.: 2. - РНФ и Красноярский краевой фонд науки, проект 23-22-10025
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Ivanova O. S., Edelman I. S., Sokolov A. Е., Svetlitsky E. S., Zharkov S. M., Sukhachev A. L., Lin Ch. R., Chen Yu. Zh.
Заглавие : Adsorption of organic dyes by Fe3O4@C, Fe3O4@C@C, and Fe3O4@SiO2 magnetic nanoparticles
Место публикации : Bull. Russ. Acad. Sci. Phys. - 2023. - Vol. 87, Is. 3. - P.338-342. - ISSN 10628738 (ISSN), DOI 10.3103/S1062873822701192. - ISSN 19349432 (eISSN)
Примечания : Cited References: 17. - This research was funded partly by the Ministry of Science and Higher Education of the Russian Federation, project FWES-2021-0035. Ch. R. Lin and Yu. Zh. Chen thank the National Science and Technology Council of Taiwan for the financial support, MOST no. 110-2112-M-153-005- and no. 108-2923-M-153-001-MY3
Аннотация: Fe3O4@C, Fe3O4@C@C, and Fe3O4@SiO2 core–shell nanoparticles are synthesized via thermal decomposition and coprecipitation. Samples are characterized via X-ray spectroscopy, transmission electron microscopy, and magnetometry. It is shown that the magnetic core of all nanoparticles is nanocrystalline and has crystal parameters corresponding to only one phase of Fe3O4, covered with a uniform shell of amorphous carbon or silicon oxide around 8 nm thick. Special attention is given to adsorption properties of the nanoparticles with respect to four dyes: Methylene blue, Congo Red, Eosin Y, and Rhodamine C. The high selectivity of Fe3O4@C nanoparticles to various dyes is revealed.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Aver'yanov E. M., Rumyantsev V. G.
Заглавие : Manifestations of the higher moments of the orientation distribution function of molecules in the spectral properties of an impurity nematic
Место публикации : J. Exp. Theor. Phys.: AMER INST PHYSICS, 2004. - Vol. 98, Is. 6. - P1146-1151. - ISSN 1063-7761, DOI 10.1134/1.1777627
Примечания : Cited References: 15
Предметные рубрики: LIQUID-CRYSTAL
SCATTERING
PHASES
MATRIX
ORDER
DYES
Ключевые слова (''Своб.индексиров.''): absorption--band structure--impurities--molecular dynamics--polarization--spectrum analysis--distribution function--local field parameters--splitting--temperature dependence--nematic liquid crystals
Аннотация: The polarized electronic absorption spectra, orientation ordering, and the special local field features were studied for push-pull linear dye molecules with strong donor-acceptor electronic conjugation of terminal fragments in the matrix of a nematic liquid crystal. The temperature-induced inversion of the sign of the splitting of polarized impurity absorption bands was observed. This effect was shown to be caused by the statistical character of orientation ordering of impurity molecules and manifestation of the higher moments of the orientation distribution function. The dependence of local field parameters (Lorentz tensor components) of impurity molecules on their orientation ordering was established. This dependence was used to reproduce the temperature dependence of the orientation order parameter of the matrix. (C) 2004 MAIK "Nauka / Interperiodica".
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : AVERYANOV E. M.
Заглавие : POLARIZED LUMINESCENCE SPECTRUM OF IMPURITY LIQUID-CRYSTAL - THE DEGENERATION LIFTED AND RENEWED BY RELAXATION
Место публикации : Zhurnal Eksperimentalnoi Teor. Fiz.: MEZHDUNARODNAYA KNIGA, 1993. - Vol. 103, Is. 6. - P2018-2038. - ISSN 0044-4510
Примечания : Cited References: 45
Предметные рубрики: RESOLVED FLUORESCENCE DEPOLARIZATION
UNIAXIAL MOLECULAR SAMPLES
NEMATIC ORDER PARAMETERS
EXCITED-STATES
SPECTROSCOPY
MEMBRANES
FLUOROPHORES
ORIENTATION
TRANSITION
DYES
Аннотация: The general molecular-statistical approach is proposed for the analysis or the polarized luminescence spectrum for impurity molecule of an arbitrary symmetry in the nematic liquid crystal matrix. On the particular example of uniaxial molecules the influence of features of the molecular electron structure, orientational statistics, molecular dynamics, and features of the anisotropic intermolecular coupling upon the positions of maxima v(if)(t) of impurity fluorescence polarized bands J(ij)(t) is studied. For the first time it is shown that all these factors significantly affect the degree of spectrum v(ij)(t) degeneration. For t not-equal 0, relaxation of excited impurity molecule subsystem toward the orientational distribution lifts a partial degeneration of spectrum v(ij), occuring at t not-equal 0, and renews partial or total degeneration of spectrum v(ij) in the limit t = infinity. In the lack of the spectrum v(ij) degeneration for t = 0 the relaxation may restore partial degeneration for t not-equal 0 as a function of the features of electron structure of molecules. The results of work explain the familiar experimental data on the number of independent component v(ij) and relation between them, on dependence of v(ij) upon the order of matrix and impurity subsystem, on the mutual relation in the positions of impurity band polarized component in the absorption and fluorescence spectra.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : AVERYANOV E. M.
Заглавие : STATIONARY SPECTRUM OF ADMIXED LIQUID-CRYSTAL POLARIZED FLUORESCENCE
Место публикации : Zhurnal Eksperimentalnoi Teor. Fiz.: MEZHDUNARODNAYA KNIGA, 1994. - Vol. 106, Is. 3. - P767-779. - ISSN 0044-4510
Примечания : Cited References: 29
Предметные рубрики: LOCAL FIELD
SPECTROSCOPY
PARAMETERS
DYES
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Lin, Chun-Rong, Ivanova O. S., Edelman I. S., Knyazev Yu. V., Zharkov S. M., Petrov D. A., Sokolov A. Е., Svetlitsky E. S., Velikanov D. A., Solovyov, Leonid A., Chen, Ying-Zhen, Tseng, Yaw-Teng
Заглавие : Carbon double coated Fe3O4@C@C nanoparticles: Morphology features, magnetic properties, dye adsorption
Коллективы : Russian Foundation for Basic ResearchRussian Foundation for Basic Research (RFBR) [19-52-52002]; Ministry of Science and Technology of TaiwanMinistry of Science and Technology, Taiwan [108-2923-M-153-001-MY3, 109-2112-M-153-003]; Joint Scientific Center of the Siberian Federal University [FSRZ-2020-0011]; Ministry of Science and Higher Education of the Russian Federation
Место публикации : Nanomaterials. - 2022. - Vol. 12, Is. 3. - Ст.376. - ISSN 2079-4991(eISSN), DOI 10.3390/nano12030376
Примечания : Cited References: 44. - The work was supported financially by the Russian Foundation for Basic Research, Grant No. 19-52-52002 and Ministry of Science and Technology of Taiwan, Grants MOST No. 108-2923-M-153-001-MY3 and No. 109-2112-M-153-003-. The support was obtained also from the Joint Scientific Center of the Siberian Federal University supported by the State assignment (#FSRZ-2020-0011) of the Ministry of Science and Higher Education of the Russian Federation, where the Transmission Electron Microscopy studies were carried out
Предметные рубрики: SOLID-PHASE EXTRACTION
FE3O4 NANOPARTICLES
PROFILE REFINEMENT
Аннотация: This work is devoted to the study of magnetic Fe3O4 nanoparticles doubly coated with carbon. First, Fe3O4@C nanoparticles were synthesized by thermal decomposition. Then these synthesized nanoparticles, 20–30 nm in size were processed in a solution of glucose at 200 °C during 12 h, which led to an unexpected phenomenon – the nanoparticles self-assembled into large conglomerates of a regular shape of about 300 nm in size. The morphology and features of the magnetic properties of the obtained hybrid nanoparticles were characterized by transmission electron microscopy, differential thermo-gravimetric analysis, vibrating sample magnetometer, magnetic circular dichroism and Mössbauer spectroscopy. It was shown that the magnetic core of Fe3O4@C nanoparticles was nano-crystalline, corresponding to the Fe3O4 phase. The Fe3O4@C@C nanoparticles presumably contain Fe3O4 phase (80%) with admixture of maghemite (20%), the thickness of the carbon shell in the first case was of about 2–4 nm. The formation of very large nanoparticle conglomerates with a linear size up to 300 nm and of the same regular shape is a remarkable peculiarity of the Fe3O4@C@C nanoparticles. Adsorption of organic dyes from water by the studied nanoparticles was also studied. The best candidates for the removal of dyes were Fe3O4@C@C nanoparticles. The kinetic data showed that the adsorption processes were associated with the pseudo-second order mechanism for cationic dye methylene blue (MB) and anionic dye Congo red (CR). The equilibrium data were more consistent with the Langmuir isotherm and were perfectly described by the Langmuir–Freundlich model.
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Ivanova O. S., Edelman I. S., Svetlitsky E. S., Sokolov A. Е., Zharkov S. M., Petrov D. A., Sukhachev A. L., Toropova E. S., Chun-Rong Lin, Ying-Zhen Chen
Заглавие : Core-shell magnetite nanoparticles: morphology, magnetic properties, organic dyes adsorption
Коллективы : "Functional materials", International conference, Крымский федеральный университет имени В.И. Вернадского
Место публикации : Ovchinnikov S. G. International conference "Functional materials": book of abstracts/ ed. V. N. Berzhansky ; org. com. S. G. Ovchinnikov [et al.]. - Simferopol, 2023. - P.114
Примечания : Cited References: 1. - РФН № 23-22-10025
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Ivanova O. S., Edelman I. S., Lin, Chun-Rong, Svetlitsky E. S., Sokolov A. Е., Lukyanenko, Kirill A., Sukhachev A. L., Shestakov N. P., Chen, Ying-Zhen, Spivakov, Aleksandr A.
Заглавие : Core–shell Fe3O4@C nanoparticles for the organic dye adsorption and targeted magneto-mechanical destruction of Ehrlich ascites carcinoma cells
Место публикации : Materials. - 2023. - Vol. 16, Is. 1. - Ст.23. - ISSN 19961944 (eISSN), DOI 10.3390/ma16010023
Примечания : Cited References: 65. - This research was funded partly by the Ministry of Science and Higher Education of the Russian Federation, project FWES-2021-0035. C.-R.L., Y.-Z.C. and A.A.S. thank the National Science and Technology Council of Taiwan for the financial support, Grants NSTC № 108-2923-M-153-001-MY3 and № 110-2112-M-153-005-. Magnetic investigations were carried out in the Center for Collective Use of the Krasnoyarsk Regional Center of Research Equipment of Federal Research Center “Krasnoyarsk Science Center SB RAS”
Аннотация: The morphology, structure, and magnetic properties of Fe3O4 and Fe3O4@C nanoparticles, as well their effectiveness for organic dye adsorption and targeted destruction of carcinoma cells, were studied. The nanoparticles exhibited a high magnetic saturation value (79.4 and 63.8 emu/g, correspondingly) to facilitate magnetic separation. It has been shown that surface properties play a key role in the adsorption process. Both types of organic dyes—cationic (Rhodomine C) and anionic (Congo Red and Eosine)—were well adsorbed by the Fe3O4 nanoparticles’ surface, and the adsorption process was described by the polymolecular adsorption model with a maximum adsorption capacity of 58, 22, and 14 mg/g for Congo Red, Eosine, and Rhodomine C, correspondingly. In this case, the kinetic data were described well by the pseudo-first-order model. Carbon-coated particles selectively adsorbed only cationic dyes, and the adsorption process for Methylene Blue was described by the Freundlich model, with a maximum adsorption capacity of 14 mg/g. For the case of Rhodomine C, the adsorption isotherm has a polymolecular character with a maximum adsorption capacity of 34 mg/g. To realize the targeted destruction of the carcinoma cells, the Fe3O4@C nanoparticles were functionalized with aptamers, and an experiment on the Ehrlich ascetic carcinoma cells’ destruction was carried out successively using a low-frequency alternating magnetic field. The number of cells destroyed as a result of their interaction with Fe3O4@C nanoparticles in an alternating magnetic field was 27%, compared with the number of naturally dead control cells of 6%.
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Gunyakov V. A., Zhuikov V. A., Zyryanov V. Ya., Smorgon S. L., Shabanov V. F.
Заглавие : Dichroic dyes in oriented PDLC films
Коллективы : International Meeting on Optics of Liquid Crystals
Место публикации : 4th International Meeting on Optics of Liquid Crystals: abstracts. - 1991. - P.72
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10.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Gerasimova M. A., Tomilin F. N., Malyar E. Y., Varganov S. A., Fedorov D. G., Ovchinnikov S. G., Slyusareva E. A.
Заглавие : Fluorescence and photoinduced proton transfer in the protolytic forms of fluorescein: Experimental and computational study
Место публикации : Dyes Pigm. - 2020. - Vol. 173. - Ст.107851. - ISSN 01437208 (ISSN), DOI 10.1016/j.dyepig.2019.107851
Примечания : Cited References: 58. - This work is supported by the Russian Foundation for Basic Research, Russia (project 19-02-00450 ). S.A.V. thanks the National Science Foundation, United States for financial support through a CAREER Award ( CHE-1654547 ).
Аннотация: In contrast to the well-studied absorption spectra of different protolytic forms of fluorescein, the complex structure of the fluorescence spectra in a wide pH range is not completely understood because of the interplay between emission and photoinduced proton transfer in the electronic excited states. We provide insight into this interplay through a combined analysis of the experimental data, obtained by absorption and steady-state fluorescence spectroscopy at pH 0.3–10.5, and the time-dependent density functional theory (TD-DFT). The TD-DFT based computational model is validated on dianion and used to model the spectra of other protolytic forms. The protolytic/tautomeric forms of fluorescein are classified according to the partial charges on the triple chromophore ring, and electronic transitions are analyzed in terms of changes in molecular geometries and orbitals. A linear regression analysis between the calculated and experimental results based on both absorption and well-understood dianionic and cationic fluorescence peaks is used to assign the monoanionic (496 nm), neutral quinoid (550 nm) and neutral zwitterionic (483 nm) fluorescence peaks, whose positions were not clear prior to this work. The values of the excited-state dissociation microconstants pka* for different forms of fluorescein are calculated by means of the Forster cycle in conjunction with the spectroscopic measurements and computational data.
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11.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Krakhalev M. N., Prishchepa O. O., Zyryanov V. Ya.
Заглавие : Inverse mode of ion-surfactant method of director reorientation inside nematic droplets
Место публикации : Mol. Cryst. Liquid Cryst. - 2009. - Vol. 512, Is. 1. - P.1998-2003. - ISSN 1542-1406, DOI 10.1080/15421400903050814
Примечания : Cited Reference Count: 8. - Гранты: This work was partially supported by the grants Nos. NSh-3818.2008.3; 02.740.11.0220, and No. 08-03-01007 of RFBR, and Nos. 27.1; 110; 144 of SB RAS. M. Krakhalev acknowledges the financial support from K. I. Zamaraev MBN Foundation. O. Prishchepa acknowledges the financial support from Russian Science Support Foundation.Финансирующая организация: RFBR [NSh-3818.2008.3, 02.740.11.0220, 08-03-01007]; SB RAS [27.1; 110; 144]; Zamaraev MBN Foundation; Russian Science Support Foundation
Ключевые слова (''Своб.индексиров.''): electrically commanded surfaces--ion surfactant--nematic--polymer dispersed liquid crystals--surface anchoring--electrically commanded surfaces--ion surfactant--nematic--polymer dispersed liquid crystals--surface anchoring--applied voltages--crossed polarizers--director fields--director reorientation--droplet structure--electrically commanded surfaces--high concentration--homeotropic--initial state--ionic modification--liquid-crystal droplets--nematic droplets--nematic polymer--surface-active cations--surface-anchoring--trimethyl--ammonium compounds--cationic surfactants--crystals--drop formation--dyes--ionization of liquids--ions--liquid crystal displays--liquid crystals--liquids--nematic liquid crystals
Аннотация: Inverse mode of a novel electrooptical effect caused by the ionic modification of boundary conditions has been studied for liquid crystal droplets. We have considered the droplets of nematic 5CB doped with cationic surfactant cetyl-trimethyl-ammonium-bromide and dispersed in polyvinyl alcohol. In the initial state the surface anchoring was normal on the whole interface due to the high concentration of homeotropic surfactant. Applied voltage results in the purification of a section of the interface from the surface-active cations thereby restoring here a tangential anchoring and stimulating the significant transformation of droplet structure. At that three different types of director field distribution can be realized within the same droplet. The proper textures of the droplet both in the crossed polarizers and without analyzer are considered.
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12.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Slyusareva E. A., Sizykh A. G., Gerasimova M. A., Slabko V. V., Myslivets S. A.
Заглавие : Laser photolysis of fluorone dyes in a chitosan matrix
Место публикации : Quantum Electron.: Turpion LTD, 2012. - Vol. 42, Is. 8. - P.687-692. - ISSN 1063-7818, DOI 10.1070/QE2012v042n08ABEH014860
Примечания : Cited References: 32
Предметные рубрики: POLY(VINYL ALCOHOL) MATRIX
XANTHENE DYES
ROSE-BENGAL
FLUORESCENCE PROPERTIES
DELAYED FLUORESCENCE
ORGANIC-MOLECULES
TRIPLET-STATE
EXCITATION
ABSORPTION
PHOSPHORESCENCE
Ключевые слова (''Своб.индексиров.''): laser photolysis--fluorescein--dibromofluorescein--eosin y--erythrosin b--rose bengal--chitosan--photobleaching kinetics--two-step absorption
Аннотация: Kinetics of laser-induced photobleaching of fluorone dyes (fluorescein, dibromofluorescein, eosin Y, erythrosin B, Rose Bengal) is studied in a chitosan matrix. For all dyes the bleaching kinetics at the intensities of laser radiation 0.7 — 11.9 W cm-2 demonstrates quasi-monomolecular behaviour. The results are analysed using a kinetic model, based on the four-level (S0, S1, T1, Tn) scheme of the dye with chemically active triplet states taken into account. It is shown that the rate constants of the chemical reaction involving higher triplet states in the dyes studied amount to (3.9 — 18.6) × 106 s-1 and exceed the analogous values for the reaction involving the first lower triplet states by nine orders of magnitude. The rate of reaction involving the first triplet states appeared to be higher by one — two orders of magnitude than that in the case of higher triplet states involved because of low population of the latter. The possible mechanism of dye bleaching with participation of chitosan that consists in reduction of the dye to the leuco form by transfer of hydrogen from the chitosan matrix is discussed.
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13.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Ivanova O. S., Edelman I. S., Sokolov A. Е., Svetlitsky E. S., Chun-Rong Lin, Ying-Zhen Chen
Заглавие : Magnetic nanoparticles Fe3O4, Fe3O4@sIo2, Fe3O4@C, and Fe3O4@C@C for the organic dyes adsorption
Коллективы : Российская академия наук, Физико-технический институт им. Е.К. Завойского ФИЦ Казанского научного центра РАН, Казанский (Приволжский) федеральный университет, Euro-Asian Symposium "Trends in MAGnetism", "Trends in MAGnetism", Euro-Asian Symposium
Место публикации : VIII Euro-Asian symposium "Trends in magnetism" (EASTMAG-2022): Book of abstracts/ program com. S. G. Ovchinnikov [et al.]. - 2022. - Vol. 2, Sect. M: Magnetism in biology and medicine. - Ст.M.O4. - P.424-436. - ISBN 978-5-94469-051-7
Примечания : Cited References: 1. - Support by Ministry of Science and Technology of Taiwan, Grants MOST № 108-2923-M-153-001-MY3 and № 109-2112-M-153-003- is acknowledged
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14.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Lukinykh V. F., Myslivets S. A., Popov A. K., Slabko V. V.
Заглавие : Nonlinear optical frequency-mixing in DYE vapors
Разночтения заглавия :авие SCOPUS: Nonlinear optical frequency-mixing in dye vapors
Место публикации : APPLIED PHYSICS B-PHOTOPHYSICS AND LASER CHEMISTRY: SPRINGER VERLAG, 1985. - Vol. 38, Is. 2. - P143-146. - ISSN 0721-7269, DOI 10.1007/BF00697454
Примечания : Cited References: 18
Ключевые слова (''Своб.индексиров.''): 42.65--42.80--dyes and dyeing--lasers, solid state - applications--dye vapors--nonlinear optical frequency-mixing--light
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15.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Nazarov V. G., Gunyakov V. A., Parshin A. M., Zyryanov V. Ya., Shabanov V. F.
Заглавие : Optical anisotropy of uniaxially oriented films of polymer-encapsulated liquid crystals
Коллективы : International Seminar on Display Optics
Место публикации : J. Opt. Technol. - 2005. - Vol. 72, Is. 9. - P.675-677. - SEP. - ISSN 1070-9762, DOI 10.1364/JOT.72.000675
Примечания : Cited Reference Count: 13
Ключевые слова (''Своб.индексиров.''): dichroic dyes--laser radiation--optical anisotropy--uniaxially oriented films--anisotropy--density (optical)--dyes--helium neon lasers--light polarization--light scattering--light transmission--liquid crystal polymers--optical films
Аннотация: Uniaxially oriented films of polymer-encapsulated liquid crystals (PELCs) possess strong light-scattering anisotropy. The macroscopic transmittance anisotropy in uniaxially oriented PELC films can be strengthened by adding dichroic dyes to the LC drops. The ratio T-perpendicular to/T-parallel to of the principal components of the optical transmittance polarized perpendicular and parallel to the orientation of the PELCs, respectively, has been measured for He-Ne laser radiation transmitted through uniaxially oriented samples. The experiments showed that the transmittance anisotropy T-perpendicular to/T-parallel to for samples doped with dye is greater than the anisotropy caused only by light scattering. (c) 2005 Optical Society of America.
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16.

Вид документа : Статья из сборника (выпуск продолж. издания)
Шифр издания :
Автор(ы) : Rogova A. V., Gerasimova M. A., Tomilin F. N., Slyusareva E. A.
Заглавие : Quantum chemical study of the spectral characteristics of fluorescein dyes bound to chitosan
Коллективы : International Conference on Pulsed Lasers and Laser Applications
Место публикации : Proc. SPIE: SPIE, 2021. - Vol. 12086: 15th International Conference on Pulsed Lasers and Laser Applications (12 - 17 September 2021, Tomsk, Russia) Conference code: 176103. - Ст.120861V. - , DOI 10.1117/12.2613980
Примечания : Cited References: 17. - This study was supported by the Russian Foundation for Basic Research, project no. 19-02-00450-а and by the Ministry of Science and High Education of Russian Federation, project no. FSRZ-2020-0008
Аннотация: Recently, there has been an increased interest in natural polysaccharides, in particular, chitosan, which are widely used in medicine and industry. Chitosan labeled with fluorescein dyes acquires additional optical properties that can be used in sensing and delivery systems. Mechanism of binding of a polymer to a label largely determines the field of its possible applications. The quantum chemical calculation using the B3LYP/aug-cc-pVDZ theory level has been made in order to contribute to the understanding of intermolecular interactions. The geometry of fluorescein, eosin Y, and erythrosin B in the dianionic, monoanionic, and neutral quinoid forms interacting with chitosan has been optimized and the absorption spectra have been calculated using the time-dependent density functional theory taking into account the solvent. The comparison of the calculated absorption spectra with the experimental data has shown a major role of the electrostatic mechanism in binding of anionic dyes to the protonated chitosan groups.
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17.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Ivanova O. S., Edelman I. S., Sokolov A. Е., Svetlitsky E. S., Lin C.-R., Chen Y. -Z., Tseng Y.-T.
Заглавие : Selective adsorption capacity of Fe3O4@C nanoparticles with respect to organic cationic dyes
Коллективы : Asian School-Conference on Physics and Technology of Nanostructured Materials, Азиатская школа-конференция по физике и технологии наноструктурированных материалов
Место публикации : The Sixth Asian school-conference on physics and technology of nanostructured materials: Proceedings. - VLadivostok, 2022. - Ст.IV.p.14. - P.231-232. - ISBN 987-5-8044-1716-2
Примечания : Cited References: 3
Предметные рубрики:
Аннотация: The Fe3O4 and core-shell Fe3O4@C magnetic nanoparticles (NPs) with an average size of 15 ± 2 nm were synthesized and characterized. Comparative study of two types of NPs revealed their different sorption capacity of cationic and anionic dyes. The leading role of electrostaticinteractions in the dyes adsorption by Fe3O4@C NPs has been revealed.
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18.

Вид документа : Статья из сборника (выпуск продолж. издания)
Шифр издания :
Автор(ы) : Tomilin F. N., Rogova A. V., Kaufman E. V., Drevolsky A. S., Gerasimova M. A., Slyusareva E. A.
Заглавие : Solvent effect in the theoretical absorption and emission spectra of fluorescein dyes
Коллективы : International Conference on Pulsed Lasers and Laser Applications
Место публикации : International Conference on Pulsed Lasers and Laser Applications (14 ; 2019 ; 15-20 Sept. ; Tomsk). Proceedings of SPIE - The International Society for Optical Engineering. - 2019. - Vol. 11322: XIV International Conference on Pulsed Lasers and Laser Applications, AMPL 2019 (15-20 September 2019) Conference code: 156656. - Ст.113220O. - , DOI 10.1117/12.2548739
Примечания : Cited References: 13. - This work was supported by the Russian Foundation for Basic Research, project 19-02-00450
Аннотация: Fluorescein and its halogenated derivatives representing a family of homologous dyes with the gradual substitution of halogen atoms for hydrogen ones are widely used in biomedicine as fluorescent probes. This stimulates the intense experimental and theoretical studies of their fluorescent properties in aqueous solutions. However, the theoretical calculations are complicated by the necessity of taking into account the effect of a solvent (water) in the explicit form and the need for effective basic sets. This is especially important for the dyes that contain heavy atoms. In this study, the quantum-chemical investigations of the dianionic form of fluorescein and its Br- and I-substituted derivatives (eosin Y and erythrosin B) have been carried out using the time-dependent density functional theory (B3LYP functional) implemented in the GAMESS software suite. The effect of a solvent has been considered in the framework of the modified Thomas polarizable continuum model. The calculations have been made for vertical (absorption and emission) excitations in the adiabatic approximation and at the nonequilibrium solvation. The results obtained for the nonequilibrium solvation are in excellent agreement with the experimental data for fluorescein and its halogenated derivatives.
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19.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Chen C. -T., Lin T. -J., Molokeev M. S., Liu W. -R.
Заглавие : Synthesis, luminescent properties and theoretical calculations of novel orange-red-emitting Ca2Y8(SiO4)6O2:Sm3+ phosphors for white light-emitting diodes
Место публикации : Dyes Pigm. - 2018. - Vol. 150. - P.121-129. - ISSN 01437208 (ISSN), DOI 10.1016/j.dyepig.2017.10.047
Примечания : Cited References: 61. - This research was supported by Minister of Science and Technology under contract no. MOST 105-2622-E-033-003-CC2 and MOST 104-2628-E-033-002-MY3.
Ключевые слова (''Своб.индексиров.''): ca2y8(sio4)6o2--photoluminescence--phosphor--solid state reaction
Аннотация: The novel orange-red-emitting Ca2Y8(SiO4)6O2:Sm3+ phosphors (CYSO:Sm3+) were synthesized via conventional a solid state reaction. The crystal structure and atomic coordinates of CYSO:Sm3+ was characterized by Rietveld refinement. Luminesce properties of as-synthesized CYSO:Sm3+ phosphors are carried out by PL/PLE, decay life time, thermal quenching as well as reflectance spectrometer and LED fabrications. The results indicates that composition-optimized CYSO:1%Sm3+ exhibits orange-red emission peaks located on 564, 601, 608 and 648 nm attributed to the transitions of 4G5/2 → 6H5/2, 4G5/2 → 6H7/2, 4G5/2 → 6H7/2 and 4G5/2 → 6H9/2, respectively. The decay lifetime of CYSO:Sm3+ phosphors was in the range of 0.37–1.10 ms. The temperature-dependent photoluminescence is decreased to 80% from room temperature to 150 °C, which is superior to that of commercial red phsophpr-Y2O3:Eu3+. The results of LED fabrication by combing 405 chips and blue/green phosphors are demonstrated in this study. Finally, from viewpoint of theoretical calculations, band structure and density of state for CYSO and CYSO:Sm3+ are studied by first principles calculations. All the results indicate that CYSO:Sm3+ phosphors could be a potential material for white light-emitting diodes.
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20.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Slyusareva E. A., Tomilin F. N., Sizykh A. G., Tankevich E. Y., Kuzubov A. A., Ovchinnikov S. G.
Заглавие : The effect of halogen substitution on the structure and electronic spectra of fluorone dyes
Место публикации : Opt. Spectrosc.: MAIK NAUKA/INTERPERIODICA/SPRINGER, 2012. - Vol. 112, Is. 5. - P.671-678. - ISSN 0030-400X, DOI 10.1134/S0030400X12040194
Примечания : Cited References: 44. - This work was supported by the FTsP Kadry GK-P333 and by the Siberian Branch of the Russian Academy of Sciences (Integration project no. 2). We are grateful to the Joint Supercomputer Center of the Russian Academy of Sciences (Moscow) and to the Complex of High-Performance Computations of the IKIT of Siberian Federal University. E. A. Slyusareva acknowledges support from the German Academic Exchange Service and the Ministry of Education and Science of the Russian Federation (the program "Mikhail Lomonosov II") of scientific research at the University of Regensburg and in the Helmholtz Center in Berlin (Germany).
Предметные рубрики: POLARIZABLE CONTINUUM MODEL
BORIC-ACID GLASS
XANTHENE DYES
FLUORESCEIN DERIVATIVES
DELAYED FLUORESCENCE
EOSIN-Y
ABSORPTION
PHOSPHORESCENCE
TRANSITIONS
EXCITATION
Аннотация: By means of the B3LYP density functional method with the use of the polarized continuum model PCM, we have performed quantum-chemical computations of the electronic absorption and fluorescence spectra of fluorone dianions: fluorescein, dibromofluorescein, eosin, erythrosine, and Rose Bengal in vacuum and methanol. We have revealed conformational features of the structure of fluorone dianions (charge redistribution, changes in the bond lengths and angles between bonds) second by the halogen substitution, the transition from the ground state to an excited state, and the change of the solvent (vacuum-methanol). Absorption and fluorescence wavelengths, constant dipole moments, transition dipole moments, and oscillator strengths have been calculated. We have showed that, upon halogenation of fluorones, the absorption spectra are redshifted and the Stokes shift decreases, which is qualitatively consistent with experimental results.
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