Solvophobic-controlled synthesis of smart magneto-fluorescent nanostructures for real-time inspection of metallic fractures

Author(s)

de Melo, Fernando Menegatti ^{[1, 2]} ; Mattioni, V, Joao ; Dias, Fernando ^[2] ; Fu, Ying ^[3] ; Toma, Henrique E. ^[4]

Affiliation

^[1] Univ Sao Paulo, Inst Chem, Supramol Nanotech Lab, Ave Prof Lineu Prestes 748, BR-05508000 Sao Paulo - Brazil

^[2] Met Chek Brasil Ind & Comercio, Res & Dev Dept, Rua Ind 135, BR-12926674 Braganca Paulista, SP - Brazil

^[3] Halmstad Univ, Sch Informat Technol, SE-30118 Halmstad - Sweden

^[4] Mattioni, Joao, V, Univ Sao Paulo, Inst Chem, Supramol Nanotech Lab, Ave Prof Lineu Prestes 748, BR-05508000 Sao Paulo - Brazil

• Document type: Journal article
• Source: NANOSCALE ADVANCES; v. 3, n. 12, p. 3593-3604, JUN 21 2021.
• Web of Science Citations: 0

Abstract

The production of materials that contain more than one functional constituent, the so-called multifunctional materials, is quite relevant in advanced technology. By acting as building blocks, nanoparticles can be suitably explored for generating higher-order multifunctional structures. In this regard, herein, a special clustered magneto-fluorescent superstructure has been developed for non-destructive detection of flaws and shallow subsurface discontinuities in industrial ferromagnetic materials. The strategy consists of the solvophobic-controlled assembly of organic-based maghemite cores and water-based II-VI quantum dots, in the presence of hexadecyltrimethyl-ammonium bromide, CTAB, as a compatibilizer agent. This composite exhibited a high magnetic response (sigma(max) = 66 emu g(-1)) and uniform size, in addition to tunable optical properties (QY = 78%). The strategy of utilizing nanoparticles as magneto-fluorescent nanoprobes to identify tiny slits represents a great advance, for improving the capability of precisely revealing the fracture boundary locations by visual real-time inspection. The nanoscale probes exhibit a low signal-to-noise ratio and a higher competitive performance in relation to the existing micrometric detection systems. (AU)

• FAPESP's process: 19/14771-5 - Development of superparamagnetic nanoparticles functionalized with complexing agents for the capture and exploitation of strategic metals
• Grantee: João Victor Mattioni
• Support Opportunities: Scholarships in Brazil - Doctorate (Direct)
• FAPESP's process: 18/21489-1 - Supramolecular nanotechnology: design, materials and devices
• Grantee: Henrique Eisi Toma
• Support Opportunities: Research Projects - Thematic Grants