| 초록 |
Lignin has been spotlighted as an abundant bio-renewable resource for material technology and industry such as biofuels, binders, composites, and nanomaterials for drug delivery. Despite its high potential for applications, only a small portion of produced lignin has been commercially utilized due to its complex and irregular structure, which makes it difficult to estimate interaction mechanism of lignin. Herein, a surface forces apparatus (SFA) was used to investigate pH-dependent molecular interaction between the lignin nanofilm and five different functionalized self-assembled monolayers (SAMs). The lignin nanofilm exhibited the strongest adhesion against NH2-SAM, indicating that the molecular interaction of lignin is mainly governed by electrostatic and cation-π interaction. The force-distance profile against CH3-SAM exhibited similar pH-dependent interaction compared to that of between lignin nanofilms, indicating that the dominant cohesion mechanism is hydrophobic interaction. |
