Neutron scattering reveals water confined in a watertight bilayer vesicle

• Verfasst von: Abuillan, Wasim [VerfasserIn]
• Verfasst von: Becker, Alexandra S. [VerfasserIn]
• Verfasst von: Tanaka, Motomu [VerfasserIn]
• Titel: Neutron scattering reveals water confined in a watertight bilayer vesicle
• Verf.angabe: Wasim Abuillan, Alexandra S. Becker, Bruno Demé, Tatsuya Homma, Hiroyuki Isobe, Koji Harano, Eiichi Nakamura, and Motomu Tanaka
• E-Jahr: 2018
• Jahr: August 17, 2018
• Umfang: 6 S.
• Fussnoten: Gesehen am 04.04.2019
• Titel Quelle: Enthalten in: American Chemical SocietyJournal of the American Chemical Society
• Ort Quelle: Washington, DC : American Chemical Society, 1879
• Jahr Quelle: 2018
• Band/Heft Quelle: 140(2018), 36, Seite 11261-11266
• ISSN Quelle: 1520-5126
• DOI: doi:10.1021/jacs.8b04066
• Datenträger: Online-Ressource
• Sprache: eng
• K10plus-PPN: 1662814704

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 a self-assembled vesicle of an anionic perfluoroalkylated [60]fullerene, unique for its outstanding stability and water tightness, containing 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 permeability that is 6 to 9 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 physicochemical studies of confined water as well as ions and molecules dissolved in it.