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Zaccariello G, Back M, Benedetti A, Canton P, Cattaruzza E, Onoda H, Glisenti A, Alimonti A, Bocca B, Riello P. Bismuth titanate-based UV filters embedded mesoporous silica nanoparticles: Role of bismuth concentration in the self-sealing process. J Colloid Interface Sci 2019; 549:1-8. [PMID: 31015051 DOI: 10.1016/j.jcis.2019.04.042] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2019] [Revised: 04/08/2019] [Accepted: 04/14/2019] [Indexed: 10/27/2022]
Abstract
The development of new safe inorganic UV filters to effectively protect the skin from ultraviolet (UV) radiation effects is an emerging issue. Bismuth titanate-based UV filters embedded into mesoporous silica nanoparticles (MSN) represent a new class of inorganic sunscreens, with excellent UVA and UVB shielding properties. In addition, the presence of bismuth ions promotes a self-sealing process, allowing (i) the entrapment of the active phases in the deepest core of the system and (ii) the formation of an external glassy silica layer with a consequent suppression of the photocatalytic activity. In this work, aimed at studying in detail the self-sealing mechanism and accessing the role of bismuth ions in the formation of the system, a series of samples impregnated with a different amount of bismuth were investigated. The self-sealing process already occurs at the lowest content of bismuth and the mechanism is demonstrated to be triggered by the ability of Bi to work as a low-melting point agent for silica. Finally, a sunscreen formulation containing the new UV filter was prepared and the Sun Protection Factor (SPF), the pH and the viscosity were measured, demonstrating the potential of the proposed material for large-scale applications.
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Affiliation(s)
- Gloria Zaccariello
- Department of Molecular Sciences and Nanosystems and Centro di Microscopia Elettronica "Giovanni Stevanato", Ca' Foscari University of Venice, Via Torino 155/b, I-30170 Venezia-Mestre, Italy; Department of Informatics and Environmental Sciences, Kyoto Prefectural University, 1-5, Shimogamo Nakaragi-cyo, Sakyo-ku, 606-8522 Kyoto, Japan.
| | - Michele Back
- Department of Molecular Sciences and Nanosystems and Centro di Microscopia Elettronica "Giovanni Stevanato", Ca' Foscari University of Venice, Via Torino 155/b, I-30170 Venezia-Mestre, Italy.
| | - Alvise Benedetti
- Department of Molecular Sciences and Nanosystems and Centro di Microscopia Elettronica "Giovanni Stevanato", Ca' Foscari University of Venice, Via Torino 155/b, I-30170 Venezia-Mestre, Italy.
| | - Patrizia Canton
- Department of Molecular Sciences and Nanosystems and Centro di Microscopia Elettronica "Giovanni Stevanato", Ca' Foscari University of Venice, Via Torino 155/b, I-30170 Venezia-Mestre, Italy.
| | - Elti Cattaruzza
- Department of Molecular Sciences and Nanosystems and Centro di Microscopia Elettronica "Giovanni Stevanato", Ca' Foscari University of Venice, Via Torino 155/b, I-30170 Venezia-Mestre, Italy.
| | - Hiroaki Onoda
- Department of Informatics and Environmental Sciences, Kyoto Prefectural University, 1-5, Shimogamo Nakaragi-cyo, Sakyo-ku, 606-8522 Kyoto, Japan.
| | - Antonella Glisenti
- Department of Chemical Sciences, University of Padua, Via F. Marzolo, 1, 35131 Padova, Italy.
| | - Alessandro Alimonti
- Istituto Superiore di Sanità, Bioelement and Health Unit, Dept. Environment and Health, Italian National Institute for Health, Viale Regina Elena 299, 00161 Rome, Italy.
| | - Beatrice Bocca
- Istituto Superiore di Sanità, Bioelement and Health Unit, Dept. Environment and Health, Italian National Institute for Health, Viale Regina Elena 299, 00161 Rome, Italy.
| | - Pietro Riello
- Department of Molecular Sciences and Nanosystems and Centro di Microscopia Elettronica "Giovanni Stevanato", Ca' Foscari University of Venice, Via Torino 155/b, I-30170 Venezia-Mestre, Italy.
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