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. 2024 Jan 8;58(3):1495–1508. doi: 10.1021/acs.est.3c07874

Figure 1.

Figure 1

Molecular interaction study between SLS and BA or BPGA. Results from ten quasi-static compression–expansion LBT iso-cycles. (A) LBT Π–A isotherms from the first compression–expansion isocycle, three independent replicates. (B) Last cycle isotherm (out of a total of ten). SLS, SLS–BA and SLS–BPGA; three independent replicates. (C) Comparison of maximum surface pressures at the first and last (10th) cycles. (D) Compressibility modulus with both raw and smoothed data (Savitzky–Golay filter over nine points) shown. Arrows point to areas of interest in the graph (see text). (E) Hysteresis of the first and last cycles relative to the SLS first cycle. Experiments done at 25 °C. Preliminary results at 37 °C (Supporting Information Figure S2) did not allow us to investigate molecular interactions at high surface pressures. (F) Investigated vaping compounds. Significance values represent results from two-Way ANOVAs; “ns”: not significant (p > 0.05), *p < 0.05, **p < 0.01, ***p < 0.001, ****p < 0.0001.