Charge-separated peptide β-sheet with a positive charge on one side and a negative charge on the other side adsorbed on a mica surface with well-ordered geometry along the crystallographic direction of the mica surface. In MeOH and MeOH/H2O mixed solvent, the peptides do not form β-sheet structure. During the evaporation process of the solvent on a mica substrate, the peptides self-assembled to form β-sheet and adsorb on the surface via electrostatic interaction between negative charge of the mica surface and positive charge of the lysine side chain on one side of the β-sheet.
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