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This study introduces a microcapillary liquid crystal (LC) sensor for detecting amphiphilic species in water. The reversible sensor tracks chemical and biological substances, crucial for health and safety.

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Area of Science:

  • Materials Science
  • Chemical Sensing
  • Liquid Crystals

Background:

  • Liquid crystals (LCs) exhibit stimuli-responsive and optical properties suitable for sensitive detection.
  • Amphiphilic species in aqueous media require effective tracking for biological and chemical monitoring.

Purpose of the Study:

  • To develop and demonstrate a microcapillary-based method for online detection of amphiphilic species.
  • To utilize liquid crystals' responsive properties for sensing applications in aqueous environments.
  • To enable continuous tracking of chemical and biological species.

Main Methods:

  • Utilized compartments of nematic 4-cyano-4'-pentylbiphenyl (5CB) within cylindrical glass microcapillaries.
  • Promoted homeotropic anchoring of LCs, with flat surfaces in contact with aqueous media.
  • Characterized equilibrium and nonequilibrium responses of LCs to changes in aqueous interface anchoring.

Main Results:

  • Observed the formation and movement of a positively charged defect upon anchoring transition, leading to a four-petal configuration.
  • Quantified the transition time to an average of 41 ± 19 minutes, attributed to elastic force imbalance.
  • Demonstrated reversible sensor behavior facilitating temporal and cumulative quantification, with metastable states removable via thermal treatment.

Conclusions:

  • The microcapillary LC sensor offers a sensitive and rapid method for detecting amphiphilic species.
  • The sensor's reversibility and quantification capabilities support continuous monitoring of chemical and biological targets.
  • This technology has potential applications in health and safety monitoring requiring real-time tracking.