Poly(methyl methacrylate)-silica microcapsules synthesized by templating Pickering emulsion droplets

J. van Wijk, J.W.O. Salari, N.Z. Zaquen, J. Meuldijk, L. Klumperman

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Abstract

In this contribution, we present the silica microencapsulation of hydrophilic compounds by templating Pickering emulsion droplets without contamination of the dispersed phase with either a catalyst or the silica precursor. This is accomplished by the use of an amphiphilic catalyst, which situates around the Pickering emulsion droplets and directs the reaction to the interface. Both silica precursor and the amphiphilic catalyst are soluble in the oil phase and therefore initially do not reside in the hydrophilic microcapsule templates. The thickness of the capsules can be tuned by adjusting the amount of precursor. Thus, the permeability of the capsules can in principle be controlled. The possibility of tuning the permeability holds promise for a variety of applications of the microcapsules. Because of the straightforward synthesis method and by minimizing mixing of the core with contaminants, the technique is potentially suitable for the encapsulation of delicate matter including live organisms, drugs, enzymes or bacteria.
Original languageEnglish
Pages (from-to)2394-2406
Number of pages12
JournalJournal of Materials Chemistry B
Volume1
Issue number18
DOIs
Publication statusPublished - 2013

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Polymethyl Methacrylate
Emulsions
Polymethyl methacrylates
Silicon Dioxide
Capsules
Silica
Catalysts
Microencapsulation
Encapsulation
Bacteria
Contamination
Enzymes
Tuning
Impurities
Oils
Pharmaceutical Preparations

Cite this

van Wijk, J. ; Salari, J.W.O. ; Zaquen, N.Z. ; Meuldijk, J. ; Klumperman, L. / Poly(methyl methacrylate)-silica microcapsules synthesized by templating Pickering emulsion droplets. In: Journal of Materials Chemistry B. 2013 ; Vol. 1, No. 18. pp. 2394-2406.
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abstract = "In this contribution, we present the silica microencapsulation of hydrophilic compounds by templating Pickering emulsion droplets without contamination of the dispersed phase with either a catalyst or the silica precursor. This is accomplished by the use of an amphiphilic catalyst, which situates around the Pickering emulsion droplets and directs the reaction to the interface. Both silica precursor and the amphiphilic catalyst are soluble in the oil phase and therefore initially do not reside in the hydrophilic microcapsule templates. The thickness of the capsules can be tuned by adjusting the amount of precursor. Thus, the permeability of the capsules can in principle be controlled. The possibility of tuning the permeability holds promise for a variety of applications of the microcapsules. Because of the straightforward synthesis method and by minimizing mixing of the core with contaminants, the technique is potentially suitable for the encapsulation of delicate matter including live organisms, drugs, enzymes or bacteria.",
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Poly(methyl methacrylate)-silica microcapsules synthesized by templating Pickering emulsion droplets. / van Wijk, J.; Salari, J.W.O.; Zaquen, N.Z.; Meuldijk, J.; Klumperman, L.

In: Journal of Materials Chemistry B, Vol. 1, No. 18, 2013, p. 2394-2406.

Research output: Contribution to journalArticleAcademicpeer-review

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AB - In this contribution, we present the silica microencapsulation of hydrophilic compounds by templating Pickering emulsion droplets without contamination of the dispersed phase with either a catalyst or the silica precursor. This is accomplished by the use of an amphiphilic catalyst, which situates around the Pickering emulsion droplets and directs the reaction to the interface. Both silica precursor and the amphiphilic catalyst are soluble in the oil phase and therefore initially do not reside in the hydrophilic microcapsule templates. The thickness of the capsules can be tuned by adjusting the amount of precursor. Thus, the permeability of the capsules can in principle be controlled. The possibility of tuning the permeability holds promise for a variety of applications of the microcapsules. Because of the straightforward synthesis method and by minimizing mixing of the core with contaminants, the technique is potentially suitable for the encapsulation of delicate matter including live organisms, drugs, enzymes or bacteria.

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