Baumann, Sophia J. and Hirsch, Thomas and Baumann, Thomas (2026) Quantification of Alkali-Fluoride Nanoparticle Dissolution in Aqueous Media as a Function of Crystallinity and Surface Modification. PARTICLE & PARTICLE SYSTEMS CHARACTERIZATION, 43 (3). e00174. ISSN 0934-0866, 1521-4117
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Time-resolved fluoride release from alkali-fluoride nanoparticles in water is quantified to decouple lattice-intrinsic from surface-mediated effects on dissolution. Bare and coated and particles are examined under fixed matrix conditions using a dialysis-coupled fluoride ion-selective electrode (-ISE). Dissolution kinetics are fitted with a speciation-aware model to extract activity-based solubility constant and an effective rate constant ; TEM, DLS, and ICP-OES provide morphological and mass-related confirmation. dissolves faster and reaches higher fluoride plateaus than , despite the lower bulk solubility product of LiF, consistent with facet/morphology-controlled reactivity. Fits yield a quartz-like dependence on undersaturation for but indicate inhibition/passivation near equilibrium for . Surface chemistry primarily suppresses rates: mesoporous silica reduces by about an order of magnitude with little change in plateau concentration; poly(acrylic acid) decreases for both lattices and lowers the plateau for ; an amphiphilic polymer causes moderate suppression and shows localized notch etching at coating vacancies. Joint reporting of matrix-specific apparent and activity-based solubility enables cross-comparison. The resulting lattice-surface map provides design guidance for engineering lanthanide-doped nanoparticles with predictable aqueous stability for imaging, sensing, and theranostic applications.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | UP-CONVERSION NANOPARTICLES; UPCONVERTING NANOPARTICLES; AMPHIPHILIC-POLYMER; LUMINESCENCE; STABILITY; KINETICS; WATER; NAYF4YB3+,ER3+; DISINTEGRATION; NANOCRYSTALS; aqueous dissolution kinetics; fluoride release; lanthanide nanoparticles; speciation modeling; surface coatings |
| Subjects: | 500 Science > 540 Chemistry & allied sciences |
| Divisions: | Chemistry and Pharmacy > Institut für Analytische Chemie, Chemo- und Biosensorik |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 15 Jul 2026 06:19 |
| Last Modified: | 15 Jul 2026 06:19 |
| URI: | https://pred.uni-regensburg.de/id/eprint/66992 |
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