Posted in Новости
Optics and Spectroscopy, 2017, Vol. 123, No. 6, pp. 965–969. © Pleiades Publishing, Ltd., 2017
A. I. Petrova, D. V. Pankin, A. V. Povolotckaia, E. V. Borisov, M. O. Beznosova, T. A. Krivul’ko , and A. V. Kurochkin
«Identification of Pigments in Colored Layers of a Painting by Raman Spectroscopy»
Optics and Spectroscopy, 2017, Vol. 123, No. 6, pp. 965–969. © Pleiades Publishing, Ltd., 2017
DOI: 10.1134/S0030400X17120128
Using the method of Raman spectroscopy the pigment composition is investigated of, and the brushwork technique used in, the original layer of a 19th century painting is established. It is an overdoor worked, presumably, by Antoine Jean-Etienne Faivre. It is established that the artist used the following pigments: cinnabar and dyes on the basis of goethite and hematite (for red, yellow–orange, and brown shades), ultramarine and Prussian blue (for blue shades), and Emerald green and a mixture of blue and yellow shades (to obtain a green color). It is determined that white lead was used a primer.
Posted in Новости
Vice-director of OLMR Dr. Anastasia Povolotckaia and Raman researcher Dmitrii Pankin at the beginning of December had visited the Center for the Restoration and Conservation of the Museums of France (Centre de Recherche et de Restavration des Musées de France (C2RMF) http://en.c2rmf.fr/).
Continue Reading
Posted in Новости
Journal of Luminescence Volume 192, December 2017, Pages 40-46
I.E. Kolesnikov, A.A. Kalinichev, M.A. Kurochkin, D.V. Mamonova, E.Yu. Kolesnikov, A.V. Kurochkin, E. Lähderanta, M.D. Mikhailov
New strategy for thermal sensitivity enhancement of Nd3+-based ratiometric luminescence thermometers
Journal of Luminescence Volume 192, December 2017, Pages 40-46
DOI: 10.1016/j.jlumin.2017.06.024
Accurate luminescence thermal sensing using nanophosphors that operate within biological windows is of great interest in bio- and nanomedicine. Here, we show that Nd3+-doped YVO4 NPs can act as nanothermometers in the second biological window upon 808 nm excitation. Significant enhancement of thermal sensitivity andtemperature resolution was achieved by optimal choice of wavelengths for ratiometric thermal calibration. It was concluded that thermal calibration should be calculated using integral intensities. The obtained temperature uncertainty together with the emission and excitation lying in the biological windows open the venue to the possible application of Nd3+-doped YVO4 NPs for real time sub-tissue luminescence thermal sensing with a subdegree resolution.
Posted in Новости
Journal of Molecular Structure Volume 1149, December 2017, Pages 323-331
Anton Nikolaev, Ilya Kolesnikov, Olga Frank-Kamenetskaya, Maria Kuzmina
Europium concentration effect on сhаracteristics and luminescent properties of hydroxyapatite nanocrystalline powders
Journal of Molecular Structure Volume 1149, December 2017, Pages 323-331
DOI: 10.1016/j.molstruc.2017.08.005
Series of Eu-apatites were synthesized by precipitation from aqueous solutions with the Eu/Ca atomic ratio from 0.5% to 5% at T = 90 ˚C. Resulting precipitates were studied using different experimental techniques including X-ray powder diffraction, infrared and raman spectroscopy, scanning elecrton microscopy, EDX and photoluminescent spectroscopy. Eu-doped Ca-deficit nanosized non-stoichiometric hydroxyapatite with high water content has been obtained throughout the experiment. Europium content in the synthesized apatites reaches 0.24 apfu (Eu/Ca = 2.5%). Relations between Eu content is the solution and precipitate have been established. It was shown that Eu-monacite starts to precipitate as secondary phase at Eu/Ca ratio in starting solution 1% or higher. Maximum luminescence is observed in apatite with ~2% Eu/Ca ratio (which equals to ~0.2 apfu and corresponds to 3% Eu/Ca ratio in the starting solution). As an important and brand-new result, apatite with 2% Eu/Ca ratio can be considered as the most appropriate material for the producing biolabels for luminescent research in medicine and biology.
Posted in Новости
The seminar was conducted in the framework of the International Scientific and Practical Conference "Heritage, Science and Technology"
Dr. Pascal Lievaux, France. Head of the Research and Scientific Policy Pilot department at the General Direction for Heritage, French Ministry of Culture.
Michel Menu, Head of the department of Research, Centre de recherche et de restauration des musées de France (C2RMF), Paris, France.
Tatiana Laska, Senior lecturer of the Faculty of Arts SPbSU
Nicolai Kurganov, Senior lecturer of the Faculty of Arts SPbSU
English (UK) 
Русский (РФ)