Ester-Based Quaternary Ammonium Salts: A Surface Tension and Small-Angle X-ray Scattering Study

June 3, 2026Langmuir

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Key Points

The study aims to examine how the structure of ester-based quaternary ammonium salts affects surface tension and micellar properties.
Conducted foaming tests at 1.0 mM concentration to assess foam heights and retention ratios.
Utilized small-angle X-ray scattering to analyze micellar structure and interfacial packing.
Examined different linker geometries: EQ-BA, EQ-TBA, and EQ-MA.
EQ-BA and EQ-TBA exhibit higher initial foam heights compared to EQ-MA at the same concentration.
Foam retention ratios remain similar across all compounds (0.95-0.96) over a 5-minute period.
The study indicates that linker geometry significantly impacts interfacial packing and micellar response.

Surface tension analysis reveals how linker geometry affects foam heights and micellar structure stability in esters.

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Min et al. (2026) studied this question.

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