Fabrication of yttria microcapsules for radiotherapy from water/oil emulsion

Radiotherapy using ceramic microparticles that act as β-emitters after neutron bombardment is attractive as a minimally invasive option for cancer treatment. Yttria (Y2O3) microcapsules (20–30 µm in diameter) are capable of cutting off the nutrition supply in cancer cells through an embolization eff...

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Bibliographic Details
Published in:Journal of the Ceramic Society of Japan 2010/06/01, Vol.118(1378), pp.479-482
Main Authors: MIYAZAKI, Toshiki, KAI, Tomohiro, ISHIDA, Eiichi, KAWASHITA, Masakazu, HIRAOKA, Masahiro
Format: Article
Language:English
Subjects:
Cancer
Ceramics
Emulsion
Emulsions
Heat treatment
Hydroxides
Microcapsule
Radiotherapy
Sol–gel
Surfactants
Yttria (Y2O3)
Yttrium
Yttrium oxide
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Summary:Radiotherapy using ceramic microparticles that act as β-emitters after neutron bombardment is attractive as a minimally invasive option for cancer treatment. Yttria (Y2O3) microcapsules (20–30 µm in diameter) are capable of cutting off the nutrition supply in cancer cells through an embolization effect. In the present study, Y2O3 microcapsules were prepared via precipitation of yttrium hydroxide from a water/oil (W/O) emulsion and a subsequent heat treatment. The emulsion was prepared by dispersing yttrium hydroxide sol in 2-ethyl-1-hexanol. Microcapsules were obtained by an addition of the emulsion in butanol via dehydration and subsequent aggregation of the yttrium hydroxide. The effects of the rotation speed and surfactant concentration on the diameter of the particles were investigated. The diameter of the microcapsules showed a tendency to decrease with increases in rotation speed during emulsion preparation or surfactant concentration in the oil phase. A high yield of the Y2O3 microcapsules with a diameter of 20–30 µm were obtained after a heat treatment at the optimized rotation speed and surfactant concentration. The obtained microcapsules showed high chemical durability in a simulated body environment.
ISSN:1882-0743
1348-6535
DOI:10.2109/jcersj2.118.479