Structural and surface studies of luminescent Ca/Eu phosphate nanomaterials: From the bulk to surface features.

Colloids Surf B Biointerfaces

Laboratorio de Estudios Cristalográficos, Instituto Andaluz de Ciencias de la Tierra (CSIC-UGR), Avda. Las Palmeras, nº 4. E-18100 Armilla, Granada, Spain.

Published: September 2022

AI Article Synopsis

  • Three types of luminescent europium-containing phosphate materials were created and analyzed for their structure and surface properties, and these were compared with a non-luminescent material, hydroxyapatite.
  • Each europium-based material showed different luminescence characteristics and lifetimes, influenced by their crystal structure and chemical makeup, despite all being nanosized.
  • The addition of europium reduced surface acidity, and while the mixed Eu/Ca materials had similar water interaction properties to hydroxyapatite, the pure europium phosphate exhibited stronger interactions with water molecules at the surface.

Article Abstract

Three luminescent Eu-containing phosphate materials (Ca-doped europium phosphate monohydrate, Eu-doped carbonated-apatite, and europium phosphate monohydrate) were prepared and analyzed on the level of bulk structure and surface properties and compared to the biomimetic non-luminescent counterpart hydroxyapatite. Europium-containing phosphate materials exhibited nanosized dimensions but different luminescence emissions and luminescence lifetimes depending on their crystalline structures (i.e., lanthanide phosphate or apatites) and chemical composition. The introduction of Eu in the crystal lattice leads to a notable decrease in the overall Lewis acidity of the surface cationic sites detected by CO probing. Further, the mixed Eu/Ca-containing materials surfaces were found to be very similar to the reference hydroxyapatite in terms of water adsorption energy, while the pure europium phosphate resulted to have the notably higher energy values of direct interaction of water molecules with the surface cations with no detected propagation of this effect towards water overlayers.

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Source
http://dx.doi.org/10.1016/j.colsurfb.2022.112620DOI Listing

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