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

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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.

Сотрудники ресурсного центра Поволоцкая Анастасия Валерьевна и Панькин Дмитрий Васильевич в начале декабря посетили центр реставрации и консервации музеев Франции (Centre de Recherche et de Restavration des Musées de France http://en.c2rmf.fr/).

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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

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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.

Семинар «Детектирование и анализ взаимодействий биомолекул в реальном времени без красителей и меток»

Уважаемые коллеги! Приглашаем Вас принять участие в семинаре «Детектирование и анализ взаимодействий биомолекул в реальном времени без красителей и меток»
30 ноября 2017, 11.00.   Санкт-Петербург, Тихорецкий пр., д. 4,  Институт цитологии РАН, малый зал. Докладчик: Dr. Renata Gronczewska, Pall Fortebio

Школа - конференция, «Сохранение природной среды и особо охраняемые природные территории»

Уважаемые коллеги, студенты, аспиранты!, 23-го и 24-го числа, в усадьбе "Сергиевка" пройдёт ежегодная молодёжная конференция «Сохранение природной среды и особо охраняемые природные территории» (К 100-летию мониторинга экосистем Петергофа и его окрестностей)