Fig. 9. (Color online) IR transmission spectrum for a solution of LAB mixed with PPO (blue solid line, Sample B), compared to LAB alone (red dashed line, Sample A) and PPO according to AIST SDBS data (green dotted line). The blue and red-dashed spectra show similar transmission below 1500 cm-1, indicating a minimal influence of PPO in this region. Above 1500 cm-1, the transmission for the LAB+PPO solution slightly increases, reaching approximately a 1% difference by 3500 cm-1. Note that sharp peaks at 670 and 1650 cm-1 are experimental artifacts, while a significant drop around 2400 cm-1 corresponds to atmospheric CO2 absorption, illustrating a maximal 1% increase in transmission in the mixture compared to LAB alone, with meaningful variations around the major absorption peaks of LAB.
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