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Surface charge of native mica, mica pre‐treated with Mg2+ or Ni2+: Representative SICM current‐distance curves performed in 150 mM NaCl on mica (A), mica pre‐treated with Mg2+ (B), and mica pre‐treated with Ni2+ (C) along with SCD statistics (D). Representative SICM current–distance curves performed in 150 mM KCl on mica (E), mica pre‐treated with Mg2+ (F), and mica pre‐treated with Ni2+ (G) along with SCD statistics (H).
