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. 2021 Nov 13;414(2):1029–1038. doi: 10.1007/s00216-021-03765-y

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© The Author(s) 2021

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Fig. 1 — TM-AFM images of APAC drop-casted on mica at various concentrations with and without addition of MgCl₂. The dilution of the APAC stock solution was a 1:50—no MgCl₂ added; b 1:100—no MgCl₂ added; c 1:200—no MgCl₂ added; d 1:100—MgCl₂ added; e 1:1000—MgCl₂ added; and f 1:20,000—MgCl₂ added