Ultrasmall Nanocapsules Obtained by Controlling Ostwald Ripening.

Autor: Doan-Nguyen TP; Max Planck-VISTEC Partner Laboratory for Sustainable Materials, Vidyasirimedhi Institute of Science and Technology (VISTEC), Rayong, 21210, Thailand.; Department of Materials Science and Engineering, School of Molecular Science and Engineering, Vidyasirimedhi Institute of Science and Technology (VISTEC), Rayong, 21210, Thailand., Jiang S; Max Planck-VISTEC Partner Laboratory for Sustainable Materials, Vidyasirimedhi Institute of Science and Technology (VISTEC), Rayong, 21210, Thailand.; Max Planck Institute for Polymer Research, 55128, Mainz, Germany., Koynov K; Max Planck Institute for Polymer Research, 55128, Mainz, Germany., Landfester K; Max Planck Institute for Polymer Research, 55128, Mainz, Germany., Crespy D; Max Planck-VISTEC Partner Laboratory for Sustainable Materials, Vidyasirimedhi Institute of Science and Technology (VISTEC), Rayong, 21210, Thailand.; Department of Materials Science and Engineering, School of Molecular Science and Engineering, Vidyasirimedhi Institute of Science and Technology (VISTEC), Rayong, 21210, Thailand.
Jazyk: angličtina
Zdroj: Angewandte Chemie (International ed. in English) [Angew Chem Int Ed Engl] 2021 Aug 09; Vol. 60 (33), pp. 18094-18102. Date of Electronic Publication: 2021 Jul 09.
DOI: 10.1002/anie.202103444
Abstrakt: We describe here a method to synthesize ultrasmall nanocapsules with a diameter of 6 nm, exhibiting a well-defined core-shell morphology. Remarkably, the nanocapules are synthesized in a miniemulsion process without the need of large amounts of surfactant as commonly used in the microemulsion process. Ultrasmall nanocapsules with an oil core and a silica shell are formed by the concurrent processes of a sol-gel reaction and Ostwald ripening. Using solvents with different water solubilities and alkoxysilanes with different reactivities, we demonstrate that sizes of obtained nanocapsules depend on the ripening rate and alkoxysilane conversion rate. The method can be also used for encapsulating natural oils such as peppermint oil and limonene. This work shows that the Ostwald ripening phenomenon can be employed beneficially for the preparation of very small colloids.
(© 2021 Wiley-VCH GmbH.)
Databáze: MEDLINE
Externí odkaz: