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Volume 16
Issue 7
10.3390/mi16070784
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Article

Assessment of SiO2 Nanotube Activity to Modify DL α-Tocopherol via 1O2 Generation Under Visible Light Irradiation

by
Mihai Anastasescu
1,†,
Radu Socoteanu
1,†,
Veronica Bratan
1,
Silviu Preda
1,
Crina Anastasescu
1,*,
Ioana Cătălina Gîfu
2,*,
Cristina Lavinia Nistor
2,
Rica Boscencu
3,
Emilian Chifor
4,*,
Catalin Negrila
5,
Ion Bordeianu
4,
Maria Zaharescu
1 and
Ioan Balint
1
1
Institute of Physical Chemistry “Ilie Murgulescu”, 202 Splaiul Independentei, 060021 Bucharest, Romania
2
National Research and Development Institute for Chemistry and Petrochemistry—ICECHIM, 202 Splaiul Independentei, 060021 Bucharest, Romania
3
Faculty of Pharmacy, “Carol Davila” University of Medicine and Pharmacy, 6 Traian Vuia St., 020956 Bucharest, Romania
4
Faculty of Medicine, Ovidius University, Aleea Universitatii nr.1, 900470 Constanţa, Romania
5
National Institute of Materials Physics, 405A Atomistilor St., 077125 Magurele, Romania
*
Authors to whom correspondence should be addressed.
†
These authors contributed equally to this work.
Micromachines 2025, 16(7), 784; https://doi.org/10.3390/mi16070784
Submission received: 9 May 2025 / Revised: 18 June 2025 / Accepted: 26 June 2025 / Published: 30 June 2025
(This article belongs to the Special Issue Emerging Trends in Optoelectronic Device Engineering)
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Abstract

This work investigates photoactive inorganic powders (SiO2, IrSiO2, and IrO2/IrSiO2) and their derivatives modified with metallated porphyrin, focusing on their ability to generate reactive oxygen species (ROS) under visible light exposure. The core material, SiO2, exhibits a tubular morphology and a high density of optically active defects. Modifiers such as metallic and iridium oxide nanoparticles, along with porphyrin, are employed to enhance light absorption and the generation of singlet oxygen (1O2) for potential biomedical applications. The time-dependent photogeneration of singlet oxygen is monitored using a Singlet Oxygen Green Sensor (SOSG), and its reactivity is evaluated in relation to DL α-Tocopherol through a spectrofluorimetric analysis. The photoactive materials, both before and after porphyrin modification, are characterized using Scanning Electron Microscopy (SEM), Atomic Force Microscopy (AFM), X-ray Diffraction (XRD), X-ray Fluorescence (XRF), UV–Vis Spectroscopy, X-ray Photoelectron Spectroscopy (XPS), N2 adsorption–desorption measurements, and zeta potential measurements.
Keywords: SiO2 nano/micro tubes; photoactivity; reactive oxygen species; DL α-Tocopherol SiO2 nano/micro tubes; photoactivity; reactive oxygen species; DL α-Tocopherol

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MDPI and ACS Style

Anastasescu, M.; Socoteanu, R.; Bratan, V.; Preda, S.; Anastasescu, C.; Gîfu, I.C.; Nistor, C.L.; Boscencu, R.; Chifor, E.; Negrila, C.; et al. Assessment of SiO2 Nanotube Activity to Modify DL α-Tocopherol via 1O2 Generation Under Visible Light Irradiation. Micromachines 2025, 16, 784. https://doi.org/10.3390/mi16070784

AMA Style

Anastasescu M, Socoteanu R, Bratan V, Preda S, Anastasescu C, Gîfu IC, Nistor CL, Boscencu R, Chifor E, Negrila C, et al. Assessment of SiO2 Nanotube Activity to Modify DL α-Tocopherol via 1O2 Generation Under Visible Light Irradiation. Micromachines. 2025; 16(7):784. https://doi.org/10.3390/mi16070784

Chicago/Turabian Style

Anastasescu, Mihai, Radu Socoteanu, Veronica Bratan, Silviu Preda, Crina Anastasescu, Ioana Cătălina Gîfu, Cristina Lavinia Nistor, Rica Boscencu, Emilian Chifor, Catalin Negrila, and et al. 2025. "Assessment of SiO2 Nanotube Activity to Modify DL α-Tocopherol via 1O2 Generation Under Visible Light Irradiation" Micromachines 16, no. 7: 784. https://doi.org/10.3390/mi16070784

APA Style

Anastasescu, M., Socoteanu, R., Bratan, V., Preda, S., Anastasescu, C., Gîfu, I. C., Nistor, C. L., Boscencu, R., Chifor, E., Negrila, C., Bordeianu, I., Zaharescu, M., & Balint, I. (2025). Assessment of SiO2 Nanotube Activity to Modify DL α-Tocopherol via 1O2 Generation Under Visible Light Irradiation. Micromachines, 16(7), 784. https://doi.org/10.3390/mi16070784

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