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(a) Chemical structures of the surfactants used in the present research. The cationic trimethyl-ammonium surfactant has n = 8, 12, 14, and 16 carbon atoms in the hydrophobic tail, respectively; (b) schematic of the DNA-surfactant solution preparation. Firstly, 1.6 μL DNA (stock concentration 0.5 μg/μL) was loaded into a capillary cell, then the surfactant solution was added; (c) the procedure of depositing sample on mica for AFM imaging.
