Amorphous Titanium Dioxide Nanoparticles and Their Unexpected Fragmentation in MALDI-TOF/MS

Autor(es)

Hennemann, Artur L. ; Nogueira, Helton P. ; Ramos, Miguel D. ; Correra, Thiago C. ; Hennemann, Bruno L. ; Araki, Koiti

• Tipo de documento: Artigo Científico
• Fonte: ACS OMEGA; v. N/A, p. 11-pg., 2024-11-18.

Resumo

Amorphous 3 nm large ultrasmall (usTiO2) and 7 nm large anatase (nTiO2) nanoparticles (NPs) were successfully prepared and characterized by TEM, FTIR, DRX, UV-vis, and DLS techniques. The MALDI-TOF/MS was shown to be effective in assessing the surface chemistry but fragmentation processes precluded its use for evaluation of particle size distribution. In fact, the laser causes the fragmentation not only of amorphous TiO2 NPs but also of the material subjected to heat treatment and crystallization at 450 degrees C for 4 h upon interaction with the DHB matrix and TFA ionizing agent. No significant difference could be observed in the spectrum by varying the particle size, indicating the high stability of the TiO2 dimer and its low aggregates in the gaseous phase. In short, MALDI-TOF/MS is effective for the direct analysis of nanoparticle surfaces, especially the interaction of functionalizing molecular species with the inorganic components, which in combination with the other techniques demonstrated to be ideal for the detailed characterization of nanomaterials. (AU)

• Processo FAPESP: 18/21489-1 - Nanotecnologia supramolecular: design, materiais e dispositivos
• Beneficiário: Henrique Eisi Toma
• Modalidade de apoio: Auxílio à Pesquisa - Temático
• Processo FAPESP: 21/06726-0 - Investigação de intermediários reativos em processos químicos e bioquímicos complexos
• Beneficiário: Thiago Carita Correra
• Modalidade de apoio: Auxílio à Pesquisa - Jovens Pesquisadores - Fase 2