Fig. 5

AFM analysis of rippled Si with varying wavelengths after protein adsorption and the corresponding cross sections along the continuous line. HPF adsorbed in a globular conformation for long (λ = 146 nm) wavelength Si ripples (a, b). For a shorter wavelength (λ = 68 nm) of the Si ripples, HPF adsorbed in a stretched conformation along the ripple backbones (c, d). For the shortest wavelength investigated (λ = 52 nm), the HPF still adsorbed in stretched conformation but with an orientation across the ripple backbones (e, f)