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Exfoliation of Molecular Solids by the Synergy of Ultrasound and Use of Surfactants: A Novel Method Applied to Boric Acid

TitleExfoliation of Molecular Solids by the Synergy of Ultrasound and Use of Surfactants: A Novel Method Applied to Boric Acid
Publication TypeArticolo su Rivista peer-reviewed
Year of Publication2024
AuthorsCalistri, S., Ubaldini A., Telloli C., Gennerini F., Marghella Giuseppe, Gessi Alessandro, Bruni Stefania, and Rizzo Antonella
JournalMolecules
Volume29
ISSN14203049
Keywordsarticle, boric acid, covalent bond, Graphene, Graphite, hydrogen bond, Liquid, nanoparticle, pharmaceutics, preliminary data, Sodium, solid, Stearic acid, surfactant, ultrasound
Abstract

Boric acid, H3BO3, is a molecular solid made up of layers held together by weak van der Waals forces. It can be considered a pseudo “2D” material, like graphite, compared to graphene. The key distinction is that within each individual layer, the molecular units are connected not only by strong covalent bonds but also by hydrogen bonds. Therefore, classic liquid exfoliation is not suitable for this material, and a specific method needs to be developed. Preliminary results of exfoliation of boric acid particles by combination of ultrasound and the use of surfactants are presented. Ultrasound provides the system with the energy needed for the process, and the surfactant can act to keep the crystalline flakes apart. A system consisting of a saturated solution and large excess solid residue of boric acid was treated in this way for a few hours at 40 °C in the presence of various sodium stearate, proving to be very promising, and an incipient exfoliation was achieved. © 2024 by the authors.

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URLhttps://www.scopus.com/inward/record.uri?eid=2-s2.0-85199604165&doi=10.3390%2fmolecules29143324&partnerID=40&md5=95ee1ad329904beb37c360db77ed609f
DOI10.3390/molecules29143324
Citation KeyCalistri2024