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. Author manuscript; available in PMC: 2015 Nov 13.
Published in final edited form as: Environ Sci Technol. 2015 Aug 12;49(17):10642–10650. doi: 10.1021/acs.est.5b01841

Figure 5.

Figure 5

Observed changes in SHG signal intensity following introduction of MPNH2-AuNPs (5 × 10−9 M number density) to POPC bilayers lacking LPS (black), or containing rough LPS (rLPS, green) or smooth LPS (sLPS, blue). The observed SHG signal arises from nanoparticle-induced resonance enhancement near the bilayer–solution interface. All experiments were performed in 0.002 M HEPES (pH 7.4) and 0.025 M NaCl.