Hostname: page-component-745bb68f8f-v2bm5 Total loading time: 0 Render date: 2025-02-10T07:55:48.398Z Has data issue: false hasContentIssue false
  • English
  • Français

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

Published online by Cambridge University Press:  01 February 2011

Sang I. Seok ,
Bok Y. Ahn ,
Joo H. Kim  and
Tae S. Suh
Sang I. Seok
Affiliation:
Advanced Materials Division, Korea Research Institute of Chemical Technology, Taejon, 305-600, KOREA
Bok Y. Ahn
Affiliation:
Advanced Materials Division, Korea Research Institute of Chemical Technology, Taejon, 305-600, KOREA
Joo H. Kim
Affiliation:
Advanced Materials Division, Korea Research Institute of Chemical Technology, Taejon, 305-600, KOREA
Tae S. Suh
Affiliation:
Advanced Materials Division, Korea Research Institute of Chemical Technology, Taejon, 305-600, KOREA
Get access

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.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 726: Symposium Q – Hybrid Organic-Inorganic Materials , 2002 , Q6.34
Copyright
Copyright © Materials Research Society 2002

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

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