Please use this identifier to cite or link to this item: http://hdl.handle.net/2445/135640
Title: Anomalously low dielectric constant of confined water
Author: Fumagalli, Laura, 1959-
Esfandiar, Ali
Fabregas, Rene
Hu, S.
Ares, Pablo
Janardanan, Amritha
Yang, Q.
Radha, Boya
Taniguchi, Takashi
Watanabe, K.
Gomila Lluch, Gabriel
Novoselov, K. S.
Geim, A. K.
Keywords: Constants físiques
Química de l'aigua
Physical constants
Water chemistry
Issue Date: 22-Jun-2018
Publisher: American Association for the Advancement of Science
Abstract: The dielectric constant ε of interfacial water has been predicted to be smaller than that of bulk water (ε ≈ 80) because the rotational freedom of water dipoles is expected to decrease near surfaces, yet experimental evidence is lacking. We report local capacitance measurements for water confined between two atomically flat walls separated by various distances down to 1 nanometer. Our experiments reveal the presence of an interfacial layer with vanishingly small polarization such that its out-of-plane ε is only ~2. The electrically dead layer is found to be two to three molecules thick. These results provide much-needed feedback for theories describing water-mediated surface interactions and the behavior of interfacial water, and show a way to investigate the dielectric properties of other fluids and solids under extreme confinement.
Note: Versió postprint del document publicat a: https://doi.org/10.1126/science.aat4191
It is part of: Science, 2018, vol. 360, num. 6395, p. 1339-1342
URI: http://hdl.handle.net/2445/135640
Related resource: https://doi.org/10.1126/science.aat4191
ISSN: 0036-8075
Appears in Collections:Articles publicats en revistes (Institut de Bioenginyeria de Catalunya (IBEC))
Articles publicats en revistes (Electrònica)

Files in This Item:
File Description SizeFormat 
688217.pdf2.82 MBAdobe PDFView/Open


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.