Skip to main content Accessibility help
×
Home

Microencapsulation of Oil in Organically Modified Silicate Glass by Sol-Gel Process

  • Sang I. Seok (a1), Bok Y. Ahn (a1), Joo H. Kim (a1) and Tae S. Suh (a1)

Abstract

Microencapsulation provides protection and sustained or controlled release of active core agents. The sol-gel process has opened up a new way for encapsulating oil droplets within an inorganic capsule. Silica microcapsules were prepared in silica precursor-oil mixtures/NH4OH water microemulsion system. In this step, the formation of capsules incorporating oil depended strongly on the type of silica precursor. A spherical silica microsheres were only obtained when oligomer, synthesized by the hydrolysis and co-condensation of equiweight of TEOS (tetraethylorthosilicate) and MTMS (methyltrimethoxysilane), was used as the wall materials. The particles size of silica microcapsules was in the range of 1 ∼ 100 μm, depending on processing parameter such as a shear rate and O/W ratio etc. In controlled release system, the shell porosity is important to give an appropriate permeability, corresponding to the release rate. The pore structure, responsible for permeability, was adjusted by doping alkyl silane, and investigated with nitrogen sorption measurement.

Copyright

References

Hide All
1. Hong, K. and Park, S., Mater. Sci. and Eng., A 272, 418 (1999)
2. Kulkarni, A. R., Soppimath, K. S. and Aminabhavi, T. M., J. Microencapsulation, 17(4), 449 (2000)
3. Pearson, R. G., Williams, E. L., J. Polym. Sci., polym. Chem. 23, 9 (1985)
4. Santos, E. M., Radin, S. and Ducheyne, P., Biomaterials, 20, 1695 (1999)
5. Ibarz, G., Dahne, L., Donath, E. and Mohwald, H., Adv. Mater., 13(17), 1324 (2001)
6. Pandey, P. C., Upadhyay, S. and Pathak, H. C., Sensors and Actuators B, 60, 83 (1999)
7. Bardo, A. M., Collinson, M. M. and Higgins, D. A., Chem. Mater., 13, 2713 (2001)
8. Carturan, G., Pagani, E., Campostrini, R. and Ceccato, R., J. Sol-Gel Sci. Tech., 8, 1115 (1997)
9. Bottcher, H. and Slowik, P. and Süβ, W., J. Sol-Gel Sci. Tech., 13, 277 (1998)
10. Brink, C. J. and Sherer, G. W., Sol-Gel Science; The Physics and Chemistry of Sol-Gel Processing, Academic Press, NY (1990)
11. Stöber, W., Fink, A., Bohn, E., J. Colloid Interface Sci., 26, 62 (1968)

Metrics

Full text views

Total number of HTML views: 0
Total number of PDF views: 0 *
Loading metrics...

Abstract views

Total abstract views: 0 *
Loading metrics...

* Views captured on Cambridge Core between <date>. This data will be updated every 24 hours.

Usage data cannot currently be displayed