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Force vs separation curve for a Si3N4 tip and a mica sample immersed in (a) water, (b) 10–3 M NaCl, (c) 10–3 M KCl, and (d) 10–3 M LiCl. Arrows indicate the extension, starting at the origin, of the interfacial region where the permittivity is lower than εtip = 7.
