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Studying Surfactant Effects on Hydrate Crystallization at Oil-Water Interfaces Using a Low-Cost Integrated Modular Peltier Device
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Bile acid-surfactant interactions at the liquid crystal/aqueous interface.

Sihui He1, Wenlang Liang, Kung-Lung Cheng

  • 1CREOL, The College of Optics and Photonics, University of Central Florida, Orlando, Florida 32816, USA.

Soft Matter
|May 15, 2014
PubMed
Summary

Cholic acid (CA) displacement of sodium dodecyl sulfate (SDS) from liquid crystal interfaces is sensitive to surfactant interactions. Mixtures of 5PCH and 5CB enhance this sensitivity by an order of magnitude.

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Area of Science:

  • Physical Chemistry
  • Materials Science
  • Biochemistry

Background:

  • Bile acids and surfactants are crucial for fat digestion through interfacial interactions.
  • Liquid crystals (LCs) and surfactants form interfaces with applications in sensing.
  • Understanding competitive adsorption at these interfaces is key to developing new technologies.

Purpose of the Study:

  • To investigate the competitive adsorption of cholic acid (CA) at sodium dodecyl sulfate (SDS)-laden liquid crystal (LC) interfaces.
  • To evaluate the effect of cyanobiphenyl (nCB) alkyl chain length and 5PCH concentration on CA-SDS interactions.
  • To assess the potential of LC/aqueous interfaces for monitoring bile acid-surfactant interactions.

Main Methods:

  • Studied competitive adsorption of CA at SDS-laden nCB (n=5-8) and 5PCH-5CB binary mixture interfaces.
  • Varied nCB alkyl chain length and 5PCH concentration to determine critical CA concentrations for SDS displacement.
  • Quantified the sensitivity of the LC/aqueous interface for monitoring CA-SDS interactions.

Main Results:

  • The critical concentration of CA needed to displace SDS decreased with shorter nCB alkyl chains (160 μM to 16 μM).
  • Increasing 5PCH concentration in 5PCH-5CB mixtures significantly reduced the critical CA concentration (16 μM to 1.5 μM).
  • 5PCH-5CB mixtures showed a tenfold increase in sensitivity for monitoring CA-SDS interactions compared to 5CB alone.

Conclusions:

  • Alkyl chain length of nCB and 5PCH concentration modulate CA adsorption at LC/aqueous interfaces.
  • 5PCH-5CB mixtures offer enhanced sensitivity for detecting bile acid-surfactant interactions.
  • These findings advance the understanding of interfacial phenomena relevant to digestion and sensing applications.