Fig. 3: Gas blowing of DL-methionine.
From: Crystallization of molecular layers produced under confinement onto a surface
a 3D molecular packing showing the α- and β-form of DL-methionine. C: gray, H: white, N: blue, O: red, S: gold; intermolecular hydrogen bonds are depicted by red dashed lines. b Images taken by AFM of the nanosheets deposited by gas blowing of 0.01 M aqueous solution at 1 bar and (c) corresponding height profiles of two crystals, indicated by the red and blue lines in panel b; the blue cross section line is shifted upwards by ~2 nm for clarity. d Raman spectrum of an individual nanosheet, showing that the crystals are α-DL-methionine, as compared to the Raman spectra of the α-form (in black) and β-form (in green) of DL-methionine crystals obtained by drop casting.
