01.06.2022 Защита магистерской диссертации

Поздравляем специалиста РЦ ОЛМИВ Бикбаеву Гулию Ильнуровну с успешной защитой магистерской диссертации по теме «Лазерный синтез периодических массивов плазмонных наноструктур для сенсорных приложений» на кафедре Лазерной Химии и Лазерного материаловедения Института Химии СПбГУ. Желаем дальнейших научных успехов и открытий! Желаем не останавливаться на достигнутом!

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01.06.2022 Multifunctional Gd2O3:Tm3+, Er3+, Nd3+ particles with luminescent and magnetic properties

by I. Shubina, I. Kolesnikov, P.Olshin, M. Likholetova, M. Mikhailov, A. Manshina, D. Mamonova

Ceramics International Vol. 48, Iss. 11, pp. 15832-15838

https://doi.org/10.1016/j.ceramint.2022.02.121

Development of novel materials with advanced properties is one of the main research directions of chemistry. New substances are not only crucial for many current technological applications but also should satisfy the needs of tomorrow. Industry often requires reliable, economically effective methods that can provide high quality reproducible results. Here we propose an inexpensive synthesis method that is suitable for synthesis of many types of particles. In this work we focused on Gd2O3:Tm3+, Er3+, Nd3+ particles with luminescence and magnetic properties. Based on the analysis of morphology, structural and optical properties of particles prepared by the standard Pechini methods and its variations, we found that the method with K2CO3 as additive yields particles with smaller sizes (down to tens of nm), higher crystallinity, and up to 1.7 times increased luminescence intensity. We also demonstrate that the unique combination of the particles’ characteristics, for example, the intensity ratio of the luminescent bands corresponding to different REI and the mass susceptibility, strongly depends on the composition, synthesis method, and structure. The variety of the combination of the properties makes these particles a promising candidate for safety markers applications.

25.05.2022 Прохождение курсов повышения квалификации

Сотрудники РЦ ОЛМИВ Поволоцкая А.В., Михайлова А.А и Капуткина С.Ю. прошли курсы повышения квалификации в рамках семинара «Новейшие разработки в области аналитического оборудования для исследования и контроля качества материалов». Организатор семинара компания ООО «Мелитек».

 

21.03.2022 Lanthanide(III)-Incorporating Polysiloxanes as Materials for Light-Emitting Devices

by A. Miroshnichenko, K. Deriabin, A. Baranov, V. Neplokh, D. Mitin, I. Kolesnikov, M. Dobrynin, E. Parshina, I. Mukhin, R. Islamova

ACS Appl. Polym. Mater. 2022, 4, 4, 2683–2690

https://doi.org/10.1021/acsapm.2c00017

Light-excited flexible and self-healing luminescent polymers have attracted extensive attention for developing advanced color-emitting films. Luminophores on the base of lanthanide(III)-incorporating polysiloxanes exhibit a high photoresponse and can be applied for controlled color lighting in flexible device applications. We present red-, green-, and blue-emitting Eu3+, Tb3+, and Tm3+-bipyridinedicarboxamide-co-polydimethylsiloxanes (Ln-Bipy-PDMS) produced with a two-step procedure of polycondensation and complexation. Bipyridinic ligands provide formation of coordinatively saturated complexes of lanthanide ions and strong photoluminescence (PL) in the case of Eu3+ and Tb3+. The thin Ln-Bipy-PDMS films are studied as ultraviolet-light converters, which can be mechanically stacked one above another to achieve the desired color. We demonstrate that these stacks can have intense PL in the spectral range from green to yellow and red. Due to the structural features, Ln-Bipy-PDMS also demonstrate a relatively high tensile (approximately 1.5 MPa) and elongation at break (approximately 185%) and non-autonomous self-healing on heating. The self-healing properties of Ln-Bipy-PDMS enable the stacking of films into monoliths with the required color of PL. Such systems do not require any synthesis stages, and a one-healed monolith film possesses two luminescence colors.

15.01.2022 DFT Modelling of Molecular Structure, Vibrational and UV-Vis Absorption Spectra of T-2 Toxin and 3-Deacetylcalonectrin

by D. Pankin, M. Smirnov, A. Povolotckaia, A. Povolotskiy, E. Borisov, M. Moskovskiy, A. Gulyaev, S. Gerasimenko, A. Aksenov, M. Litvinov and A. Dorochov

Materials 2022, 15(2), 649;

https://doi.org/10.3390/ma15020649

This paper discusses the applicability of optical and vibrational spectroscopies for the identification and characterization of the T-2 mycotoxin. Vibrational states and electronic structure of the T-2 toxin molecules are simulated using a density-functional quantum-mechanical approach. A numerical experiment aimed at comparing the predicted structural, vibrational and electronic properties of the T-2 toxin with analogous characteristics of the structurally similar 3-deacetylcalonectrin is performed, and the characteristic spectral features that can be used as fingerprints of the T-2 toxin are determined. It is shown that theoretical studies of the structure and spectroscopic features of trichothecene molecules facilitate the development of methods for the detection and characterization of the metabolites.

 

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