We have synthesized Eu-doped NaBi(MoO₄)₂ nanoparticles functionalized with PAA whose properties make them excellent multimodal contrast agents for X-ray computed tomography and luminescent bioimaging, as illustrated using a C. Elegans animal model.

Uniform spherical lanthanide-doped NaY(MoO₄)₂ nanoparticles have been synthesized, which, under UV illumination, exhibit intense multicolor luminescence and a high ability for the photocatalytic degradation of rhodamine B.

This work describes the synthesis and characterization of GeO ₂ , MgGeO ₃ :Mn ²⁺ , and Mg ₂ GeO ₄ :Mn ²⁺ films deposited using ultrasonic spray pyrolysis. These films were deposited at 500 °C and subsequently heat-treated at 900 °C for 12 h to achieve the desired crystal structure. Characterization by x-ray diffraction revealed that the GeO _₂ films exhibited a hexagonal phase, whereas the MgGeO ₃ and Mg ₂ GeO ₄ host lattices formed an orthorhombic crystalline system. Scanning electron microscopy revealed rough surfaces on these films. X-ray Photoelectron Spectroscopy was conducted primarily to investigate the oxidation states of Mn ²⁺ and Mn ⁴⁺ ions revealing that Mn ²⁺ made the largest contribution. The photoluminescence (PL), cathodoluminescence (CL), decay time, and quantum efficiency (approximately 20%) properties were analyzed as a function of the Mn dopant concentration. The incorporation of manganese ions inside these two host lattices generated pure and very intense red emission, and near-infrared emission at 825 nm was observed. For the MgGeO ₃ :Mn ²⁺ matrix, the optimum value for PL was 4 at.% Mn ²⁺ , and for CL, it was 2 at.% Mn ²⁺ . In the Mg ₂ GeO ₄ matrix, the optimum value for both PL and CL was 2 at.% Mn ²⁺ .

Magnesium aluminate spinel nanoparticles (MgAl₂O₄-S-NPs) represent a promising class of nanoceramics with potential biomedical applications due to their physicochemical stability and antimicrobial properties. This study aimed to determine the structural characteristics, composition, and biological performance of MgAl₂O₄ spinel nanoparticles that were synthesized via a mechanochemical method. Structural and compositional characterization was performed using X-ray diffraction (XRD) and high-resolution transmission electron microscopy (HR-TEM). Antibacterial activity was evaluated against Helicobacter pylori and Enterococcus faecalis using bacterial viability assays. Structural and morphological analyses confirmed the successful formation of single-phase cubic MgAl₂O₄ with a polyhedral morphology and nanoscale size distribution. Bacterial viability was quantified through optical density measurements following exposure to MgAl₂O₄-S-NPs at different concentrations. The nanoparticles exhibited both bacteriostatic and bactericidal effects, with activity being demonstrated against the tested bacterial strains. Mechanochemically synthesized MgAl₂O₄-S-NPs are promising candidates for biomedical applications, including dental materials, antimicrobial coatings, and infection-control strategies. Overall, the findings highlight the potential of MgAl₂O₄-S-NPs as effective antimicrobial agents that can be produced through an environmentally friendly synthesis route.