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!
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».
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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.
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.
by D. Pankin, M. Smirnov, A. Povolotckaia, A. Povolotskiy, E. Borisov, M. Moskovskiy, A. Gulyaev, A. Lavrov and A. Izmailov
Agronomy 2021, 11(12), 2402;
https://doi.org/10.3390/agronomy11122402
At present, one of the critical problems in agriculture is the identification of cereals, including oats, infected by Fusarium spp. genus fungi. Timely diagnostics can prevent the further disease spread and help to identify the already stored infected grains. In this regard, the aim of this work is to develop the spectroscopic approaches that determine the infected grains. As an object of the investigation the “Zalp” cultivar oat, both healthy and infected grains of the 2020 harvest were chosen. The spectroscopic diagnostics included FTIR in the mid-IR region, Raman, and luminescence methods. Combination of chemometric tools with FTIR and Raman spectroscopy allowed obtaining approaches based on identified characteristic spectral features which may be used as infection markers. These approaches make it possible to detect the infection on the grain husk. The carotenoid type fungi pigment was identified within the resonance conditions of Raman scattering excitation. The luminescence study of infected oat husk revealed the presence of characteristic chlorophyll α peak which is absent in healthy grain husk.
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