Synthesis, characterization, and incorporation of upconverting nanoparticles into a dental adhesive

Autor(es)

Pacheco, Rafael Rocha ^[1] ; Garcia-Flores, Ali Francisco ^[2] ; Soto-Montero, Jorge Rodrigo ^[3] ; Lesseux, Guilherme Gorgen ^[4] ; Rocha Acosta Lancelotti, Ailla Carla ^[4] ; Martinez, Eduardo David ^[4] ; Rettori, Carlos ^[2] ; Urbano, Ricardo Rodrigues ^[4] ; Rueggeberg, Frederick Allen ^[5] ; Giannini, Marcelo ^[6]

Afiliação do(s) autor(es)

^[1] Univ Detroit Mercy, Dept Restorat Dent, Detroit, MI 48221 - USA

^[2] Univ Fed ABC UFABC, Ctr Nat & Human Sci, Santo Andre, SP - Brazil

^[3] Univ Costa Rica, Fac Dent, Dept Restorat Sci, San Jose - Costa Rica

^[4] Univ Estadual Campinas Unicamp, Inst Phys Gleb Wataghin, Dept Quantum Elect, Campinas, SP - Brazil

^[5] Augusta Univ, Dent Coll Georgia, Dept Restorat Sci, Augusta, GA - USA

^[6] Univ Estadual Campinas Unicamp, Piracicaba Dent Sch, Dept Restorat Dent, Piracicaba, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Brazilian Oral Research; v. 35, 2021.
• Citações Web of Science: 0

Resumo

Abstract: The purpose of this study was to describe the synthesis, characterization, and functionalization of b-NaYF4:30%Yb/0.5%Tm upconverting nanocrystals for use as nanofillers in a dental adhesive and microscopically evaluate the interface between the particles and a commercial adhesive. The upconverting nanoparticles were synthesized and purified by thermal decomposition, and their chemical composition determined by energy dispersive X-Ray spectroscopy. The crystalline structure was characterized using X-Ray diffraction and morphology and size were observed with scanning and transmission electron microscopy. Upconverting emission was evaluated by spectrophotometry irradiating the particles with a 975 nm diode laser. Particles were functionalized with polyacrylic acid and the success was confirmed by measurement of Zeta Potential and transmission electron microscopy. The results of X-ray diffraction found a pure hexagonal phase crystalline pattern. Scanning electron microscopy showed uniform dispersion of hexagonal-shaped particles of approximately 150 nm. Upconversion emission was observed in 344 nm, 361 nm, 450 nm, 474nm, 646 nm, 803 nm. Functionalization success was confirmed by formation of a stable aqueous colloid with a Zeta potential of −29.5mV and the absence of voids in the particle-adhesive interface on the transmission electron microscopy images. The reported synthesis and functionalization process produced upconverting nanoparticles emitting photons within the blue spectral region (450 nm and 474 nm). (AU)

• Processo FAPESP: 11/19924-2 - Estudo e desenvolvimento de novos materiais avançados: eletrônicos, magnéticos e nanoestruturados: uma abordagem interdisciplinar
• Beneficiário: Carlos Rettori
• Modalidade de apoio: Auxílio à Pesquisa - Temático
• Processo FAPESP: 12/04870-7 - Estudos de novos materiais complexos e avançados
• Beneficiário: Pascoal Jose Giglio Pagliuso
• Modalidade de apoio: Auxílio à Pesquisa - Temático