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Electrostatic binding among equilibrating 2-D and 3-D self-assemblies.

Fredric M Menger1, Lei Shi

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PubMed
Summary
This summary is machine-generated.

Critical micelle concentration (CMC) measurements using surface tension can be misleading. Additives can saturate the air/water interface, causing false CMC readings, as seen with dodecyltrimethylammonium bromide (DTAB) and anionic additives.

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Area of Science:

  • Colloid and Surface Chemistry
  • Physical Chemistry
  • Materials Science

Background:

  • Cationic surfactants like dodecyltrimethylammonium bromide (DTAB) are widely used.
  • Critical micelle concentration (CMC) is a key parameter, typically determined by surface tension measurements.
  • The influence of anionic additives on DTAB's aggregation behavior is of significant interest.

Purpose of the Study:

  • To investigate the effect of anionic additives with varying charges on the CMC of DTAB.
  • To reconcile discrepancies between surface tension-derived CMC and bulk property measurements.
  • To challenge the universal assumption that surface tension breaks directly indicate micelle formation.

Main Methods:

  • Preparation of solutions with DTAB and six organic anionic additives at a 15:1 molar ratio.
  • Surface tension measurements to determine apparent CMC.
  • Conductivity and diffusion Nuclear Magnetic Resonance (NMR) measurements for bulk property analysis.
  • Analysis of DTAB/trianion complex formation at the air/water interface.

Main Results:

  • Surface tension plots showed a significant decrease in apparent CMC (up to 10-fold) in the presence of anionic additives.
  • Conductivity and diffusion NMR measurements yielded normal CMC values (around 14 mM) for DTAB/trianion mixtures.
  • A discrepancy was observed between surface tension-derived CMC and bulk measurements, particularly with hexanion.

Conclusions:

  • The air/water interface can become saturated with DTAB/anionic additive complexes below the actual micelle formation concentration.
  • Surface tension breaks in CMC plots may not always indicate true micelle formation.
  • Rethinking the interpretation of surface tension data in the presence of specific additives is necessary for accurate colloid chemistry analysis.