Abstract
Encapsulation of active or valuable cargoes has become one of the most important methods for controlled delivery and release. However, many existing capsule technologies suffer from scalability issues, and capsules from surfactant- or polymer-stabilised emulsions tend to have weak shells or limited stability. Here we present a robust and scalable method for the surfactant-free preparation of silica hybrid capsules templated from Pickering emulsions stabilised by graphene oxide. These capsules are produced using a single step, undemanding formulation process with cheap and scalable precursors. The mechanical and chemical stability provided by the silica shell grown around these droplets is explored using surface pressure measurements and atomic force microscopy, demonstrating that a rigid and robust capsule is produced from higher loadings of silica precursor. In order to demonstrate the utility of these capsules, the sustained release of a fragrance molecule (vanillin) from the capsules is monitored, and compared to release from unencapsulated vanilla oil. It is seen that the capsules retain the fragrance for multiple weeks, offering new pathways for scalable encapsulation systems for the delivery of valuable actives.
| Original language | English |
|---|---|
| Pages (from-to) | 528-539 |
| Number of pages | 12 |
| Journal | Journal of Colloid and Interface Science |
| Volume | 552 |
| DOIs | |
| Publication status | Published - 15 Sep 2019 |
Keywords
- Core–shell particles
- Encapsulation
- Graphene oxide
- Silica shells
Cite this
}
Graphene oxide–silica hybrid capsules for sustained fragrance release. / Ali, Muthana; Meaney, Shane P.; Abedin, Md Joynul; Holt, Phillip; Majumder, Mainak; Tabor, Rico F.
In: Journal of Colloid and Interface Science, Vol. 552, 15.09.2019, p. 528-539.Research output: Contribution to journal › Article › Research › peer-review
TY - JOUR
T1 - Graphene oxide–silica hybrid capsules for sustained fragrance release
AU - Ali, Muthana
AU - Meaney, Shane P.
AU - Abedin, Md Joynul
AU - Holt, Phillip
AU - Majumder, Mainak
AU - Tabor, Rico F.
PY - 2019/9/15
Y1 - 2019/9/15
N2 - Encapsulation of active or valuable cargoes has become one of the most important methods for controlled delivery and release. However, many existing capsule technologies suffer from scalability issues, and capsules from surfactant- or polymer-stabilised emulsions tend to have weak shells or limited stability. Here we present a robust and scalable method for the surfactant-free preparation of silica hybrid capsules templated from Pickering emulsions stabilised by graphene oxide. These capsules are produced using a single step, undemanding formulation process with cheap and scalable precursors. The mechanical and chemical stability provided by the silica shell grown around these droplets is explored using surface pressure measurements and atomic force microscopy, demonstrating that a rigid and robust capsule is produced from higher loadings of silica precursor. In order to demonstrate the utility of these capsules, the sustained release of a fragrance molecule (vanillin) from the capsules is monitored, and compared to release from unencapsulated vanilla oil. It is seen that the capsules retain the fragrance for multiple weeks, offering new pathways for scalable encapsulation systems for the delivery of valuable actives.
AB - Encapsulation of active or valuable cargoes has become one of the most important methods for controlled delivery and release. However, many existing capsule technologies suffer from scalability issues, and capsules from surfactant- or polymer-stabilised emulsions tend to have weak shells or limited stability. Here we present a robust and scalable method for the surfactant-free preparation of silica hybrid capsules templated from Pickering emulsions stabilised by graphene oxide. These capsules are produced using a single step, undemanding formulation process with cheap and scalable precursors. The mechanical and chemical stability provided by the silica shell grown around these droplets is explored using surface pressure measurements and atomic force microscopy, demonstrating that a rigid and robust capsule is produced from higher loadings of silica precursor. In order to demonstrate the utility of these capsules, the sustained release of a fragrance molecule (vanillin) from the capsules is monitored, and compared to release from unencapsulated vanilla oil. It is seen that the capsules retain the fragrance for multiple weeks, offering new pathways for scalable encapsulation systems for the delivery of valuable actives.
KW - Core–shell particles
KW - Encapsulation
KW - Graphene oxide
KW - Silica shells
UR - http://www.scopus.com/inward/record.url?scp=85066260517&partnerID=8YFLogxK
U2 - 10.1016/j.jcis.2019.05.061
DO - 10.1016/j.jcis.2019.05.061
M3 - Article
VL - 552
SP - 528
EP - 539
JO - Journal of Colloid and Interface Science
JF - Journal of Colloid and Interface Science
SN - 0021-9797
ER -