Unusual enhancement of the radical production in the X-ray irradiated aqueous-organic systems containing W(VI) in homogeneous and nanoparticle forms

Shiryaeva, E.S.; Vanina, A.I.; Baranova, I.A.; Sanochkina, E.V.; Kameneva, S.V.; Taran, G.S.; Belousov, A.V.; Klechkovskaya, V.V.; Feldman, V.I.

Статья опубликована в высокорейтинговом журнале

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Дата последнего поиска статьи во внешних источниках: 15 мая 2024 г.

Авторы: Shiryaeva Ekaterina S., Vanina Anzhelika I., Baranova Irina A., Sanochkina Elizaveta V., Kameneva Svetlana V., Taran Glafira S., Belousov Alexandr V., Klechkovskaya Vera V., Feldman Vladimir I.
Журнал: Radiation Physics and Chemistry
Том: 222
Год издания: 2024
Издательство: Elsevier
Местоположение издательства: United States
Номер статьи: 111812
DOI: 10.1016/j.radphyschem.2024.111812
Аннотация: The metal and oxide nanoparticles (NPs) containing various elements with high atomic number (Z) are considered as prospective sensitizers for the production of radicals upon X-ray irradiation of aqueous solutions, which can be used for different applications in medical treatment and material modification. The common basis for the sensitizing effect in oxygen-free systems is concerned with increase of the absorbed dose due to the presence of high-Z atoms (known as physical enhancement, relatively insensitive to the NP size). In this work we report the first experimental evidence for extra enhancement of the radical yield in a model oxygen-free aqueous organic system irradiated with X-rays (45 kVp) in the presence of W(VI) compounds, both in homogeneous solutions of Na2WO4 and in the form of ultra-small NPs of WO3. Meanwhile, in the case of larger WO3 NPs the radical yield is consistent with physical enhancement mechanism. In the case of systems containing HfO2 NPs only physical enhancement was observed, independent of the NP size. Unusually large enhancement of radical production and size effect for W(VI) in homogeneous and NP forms was tentatively attributed to the radiation-chemical processes involving intermediate formation of metastable W(V) due to reactions of hydrated electron.
Добавил в систему: Ширяева Екатерина Сергеевна

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Unusual enhancement of the radical production in the X-ray irradiated aqueous-organic systems containing W(VI) in homogeneous and nanoparticle formsстатья

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