The Effect of Bacterial Adhesion on Grafted Chains Revealed by the Non-Invasive Sum Frequency Generation Spectroscopy

Figure 2

Schematic ODT SAM conformations (the effect of ODT environment is strongly exaggerated for clarity). A: in air. B: in distilled water. C and D show the two extreme possibilities of methyl orientation adjustment allowed by the rotation of the C backbone planes about the average molecular axis. C and D correspond ideally to hydrophilic and hydrophobic interactions, respectively. The directions of the dipole moments of CH3 (symmetric 𝜇 s 3 , asymmetric in plane 𝜇 a s 3 i p and out of plane 𝜇 a s 3 o p ) are also indicated. Values of methyl axis tilt angle of the ODT SAM in different environments are added below.
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