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1.
Вид документа
: Статья из журнала
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Автор(ы)
: Zhang L., Fang M., Huang Z., Liu Y., Min X., Tang H., Chen K., Guan M., Molokeev M. S.
Заглавие
: Preparation and luminescence properties of the blue-emitting phosphor BaBPO5:Eu2+
Место публикации
: Sci. Adv. Mater. - 2016. - Vol. 8, Is. 5. - P.1086-1092. - ISSN 19472935 (ISSN),
DOI
10.1166/sam.2016.2704
Примечания
: Cited References: 22. - This work was financially supported by the National Natural Science Foundation of China (NSFC Grant no. 51172216) and the Fundamental Research Funds for the Central Universities (Grant no. 2652015022).
Предметные рубрики:
Energy-transfer
Diodes
Ions
Eu3+
Photoluminescence
Reduction
Tb3+
Ключевые слова
(''Своб.индексиров.''): babpo5--eu2+--phosphor--white light emitting diodes
Аннотация:
Blue-emitting BaBPO5:xEu2+ phosphors were prepared by a high-temperature solid-state reaction route. The crystal phase, luminescence properties, lifetime, and thermal stability were investigated, respectively. The phase analysis indicated that BaBPO5 crystallize with the structure of stillwellite-type compounds. Under the excitation at 310 nm, the phosphor exhibited an asymmetric broad-band blue emission with peak at 410 nm, which was ascribed to the 4f-5d transition of Eu2+. It was further calculated that the dipole-dipole interactions were responsible for a concentration quenching effect in BaBPO5:xEu2+ phosphors at x = 0.08. The lifetime decreased with the increasing concentration of Eu2+ ions. The temperature-dependent emission spectra indicated an excellent thermal stability of the BaBPO5:0.08Eu2+ samples. Surface morphology and CIE coordinate were also investigated. All the properties assessed indicated that the developed blue-emitting BaBPO5:Eu2+ phosphor is a good candidate for application in white-light emitting diodes. © 2016 by American Scientific Publishers.
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2.
Вид документа
: Статья из журнала
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Автор(ы)
: Kaptsov O. V., Verevkin I. V.
Заглавие
: Differential constraints and exact solutions of nonlinear diffusion equations
Место публикации
: J. Phys. A. - 2003. - Vol. 36, Is. 5. - P.1401-1414. - ISSN 0305-4470,
DOI
10.1088/0305-4470/36/5/315
Примечания
: Cited References: 29
Предметные рубрики:
REDUCTION
Аннотация:
The differential constraints are applied to obtain explicit solutions of nonlinear diffusion equations. Certain linear determining equations with parameters are used to find such differential constraints. They generalize the determining equations used in the search for classical Lie symmetries.
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3.
Вид документа
: Статья из журнала
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Автор(ы)
: Saykova, Diana, Saikova, Svetlana, Mikhlin, Yuri, Panteleeva, Marina, Ivantsov R. D., Belova E.
Заглавие
: Synthesis and characterization of core-shell magnetic nanoparticles NiFe2O4@Au
Место публикации
: Metals. - 2020. - Vol. 10, Is. 8. - Ст.1075. - ISSN 2075-4701(eISSN),
DOI
10.3390/met10081075
Примечания
: Cited References: 45
Предметные рубрики:
NICKEL FERRITE NANOPARTICLES
GOLD NANOPARTICLES
OXIDATION
REDUCTION
Аннотация:
In this study, NiFe2O4@Au core–shell nanoparticles were prepared by the direct
reduction
of gold on the magnetic surface using amino acid methionine as a reducer and a stabilizing agent simultaneously. The obtained nanoparticles after three steps of gold deposition had an average size of about 120 nm. The analysis of particles was performed by X-ray diffraction, transmission electron microscopy, X-ray photoelectron spectroscopy, and UV-Vis spectroscopy techniques. The results indicate successful synthesis of core–shell particles with the magnetic core, which consists of a few agglomerated nickel ferrite crystals with an average size 25.2 ± 2.0 nm, and the thick gold shell consists of fused Au0 nanoparticles (NPs). Magnetic properties of the obtained nanoparticles were examined with magnetic circular dichroism. It was shown that the magnetic behavior of NiFe2O4@Au NPs is typical for superparamagnetic NPs and corresponds to that for NiFe2O4 NPs without a gold shell. The results indicate the successful synthesis of core–shell particles with the magnetic nickel ferrite core and thick gold shell, and open the potential for the application of the investigated hybrid nanoparticles in hyperthermia, targeted drug delivery, magnetic resonance imaging, or cell separation. The developed synthesis strategy can be extended to other metal ferrites and iron oxides.
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4.
Вид документа
: Статья из журнала
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Автор(ы)
: Cazacu N., Chilom C. G., Iftimie S., Balasoiu M., Ladygina V. P., Stolyar S. V., Orelovich O. L., Kovalev Y. S., Rogachev A. V.
Заглавие
: Biogenic ferrihydrite nanoparticles produced by Klebsiella oxytoca: Characterization, physicochemical properties and bovine serum albumin interactions
Место публикации
: Nanomaterials. - 2022. - Vol. 12, Is. 2. - Ст.249. - ISSN 2079-4991(eISSN),
DOI
10.3390/nano12020249
Примечания
: Cited References: 59. - This research was funded by JINR Themes 02-1-1107-2011/2021, 04-5-1131-2017/2021 and 04-4-1133-2018/2023 and with the financial support of the RO-JINR Projects Nos. 366/11.05.2021 (items 7, 86, 97) and 365/11.05.2021 (items 8, 87 and 98). This work also benefited from the use of the SasView application, originally developed under NSF Award DMR-0520547. SasView also contains the code developed with funding from the EU Horizon 2020 program under the SINE2020 project Grant No 654000. The APC was funded by JINR Theme 02-1-1107-2011/2021, Project No. 366/11.05.2021, item 7. This study used the infrastructure of the Applied Genetics Resource Facility of MIPT (Suport Grant 075-15-2021-684)
Предметные рубрики:
MAGNETIC-PROPERTIES
REDUCTION
MOSSBAUER
FERRITIN
DOCKING
BINDING
Аннотация:
The synthesis of nanoparticles inside microorganisms is an economical alternative to chemical and physical methods of nanoparticle synthesis. In this study, ferrihydrite nanoparticles synthesized by Klebsiella oxytoca bacterium in special conditions were characterized by scanning electron microscopy (SEM), energy-dispersive X-ray analysis (EDS), small-angle X-ray (SAXS), UV-Vis spectroscopy, fluorescence, fluorescence resonance energy transfer (FRET), and molecular docking. The morphology and the structure of the particles were characterized by means of SEM and SAXS. The elemental content was determined by means of the EDS method. The absorption properties of the ferrihydrite nanoparticles were investigated by UV-Vis spectroscopy. The binding mechanism of the biogenic ferrihydrite nanoparticles to Bovine Serum Albumin (BSA) protein, studied by fluorescence, showed a static and weak process, combined with FRET. Protein denaturation by temperature and urea in the presence of the ferrihydrite nanoparticles demonstrated their influence on the unfolding process. The AutoDock Vina and UCSF Chimera programs were used to predict the optimal binding site of the ferrihydrite to BSA and to find the location of the hydrophobic cavities in the sub-domain IIA of the BSA structure.
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