Figure 4
Representative CFM adhesion images of an unmodified (a) and a PNIPAM modified (b) wood cell wall and lumen, obtained with a CH3-terminated tip at different temperatures. Adhesion changes of the modified areas occur due to the hydrophobic collapse of the PNIPAM polymer chains above the LCST. The adhesion and topography scales are the same for each image at the unmodified and PNIPAM modified structures.
