Neutron Scattering Reveals Water Confined in a Watertight Bilayer Vesicle
- 17 August 2018
- journal article
- research article
- Published by American Chemical Society (ACS) in Journal of the American Chemical Society
- Vol. 140 (36), 11261-11266
- https://doi.org/10.1021/jacs.8b04066
Abstract
Water molecules confined in a nanocavity possess distinctly different characteristics from those in bulk, yet the preparation of such nanocavities is still a major experimental challenge. We report here self-assembled vesicle of an anionic perfluoroalkylated [60]fullerene, unique for its outstanding stability and water tightness, contains water not bound to the membranes. Small-angle neutron scattering revealed that a vesicle of 14-nm outer radius contains a 2-nm thick fullerene bilayer, inside of which is a 3-nm thick membrane-bound water, and unbound water in the 4-nm innermost cavity. The vesicle shows astonishingly low water permea-bility that is six to nine orders of magnitude smaller than that of a lipid vesicle. As a result, a single vesicle isolated on a substrate can retain the interior water in air or even under high vacuum, indicating that the vesicle cavity provides a new tool for physico-chemical studies of confined water as well as ions and molecules dissolved in it.Keywords
Funding Information
- Ministry of Education, Culture, Sports, Science and Technology (16H00802, 17H03036, 15H05754)
- Helmholtz-Gemeinschaft
- Core Research for Evolutional Science and Technology (JPMJCR14L4)
- Deutsche Forschungsgemeinschaft (Ta259/12)
- Nakatani Foundation for Advancement of Measuring Technologies in Biomedical Engineering
- Alexander von Humboldt-Stiftung
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