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Properties of Enantiomers and Optical Activity02:24

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Optically responsive dry cholesteric liquid crystal marbles.

Ceren Kocaman1, Ozge Batir2, Emre Bukusoglu2

  • 1Department of Chemical Engineering, Middle East Technical University, Dumlupınar Bulvarı No.1 Çankaya, Ankara, 06800, Turkiye; Laboratory of Advanced Separations (LAS), École Polytechnique Fédérale de Lausanne (EPFL), Sion 1950, Switzerland.

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Summary
This summary is machine-generated.

New dry liquid crystal marbles, encapsulated by cellulose nanocrystals, offer a sensitive and reusable platform for detecting toluene vapor gas sensors. These novel materials show fast responses and potential for various sensing applications.

Keywords:
Cellulose nanocrystalsCholesteric liquid crystalEncapsulationResponsive materials

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Chemical Sensing

Background:

  • Cholesteric liquid crystals (CLCs) are known for their optical properties.
  • Existing liquid crystal (LC)-based gas sensors often face limitations in handling and response time.
  • Cellulose nanocrystals (CNCs) offer a biocompatible and stable encapsulation matrix.

Purpose of the Study:

  • To develop and characterize dry liquid crystal marbles for gas sensing applications.
  • To evaluate the sensitivity and response of these marbles to toluene vapor.
  • To explore the potential of CNC-encapsulated CLC droplets in various technological fields.

Main Methods:

  • Preparation of chiral-doped thermotropic LCs encapsulated within CNC shells.
  • Drying of the CLC/CNC structures under ambient conditions.
  • Characterization of the dry LC marbles' response to gaseous stimuli, specifically toluene vapor.

Main Results:

  • Successfully created self-standing CNC shells encapsulating CLC droplets.
  • Demonstrated that dry LC marbles are responsive to external gaseous stimuli like toluene vapor.
  • Achieved a toluene detection limit below 500 ppm with a rapid response time (90% max response in ~13 seconds).
  • Confirmed the stability of CNC-encapsulated CLC droplets and the reusability of the dry LC marbles.

Conclusions:

  • Dry LC marbles represent a promising, easy-to-handle gas sensing material with fast response times.
  • The observed toluene detection mechanism involves changes in the CLC helical structure.
  • These LC marbles have potential applications beyond gas sensing, including drug delivery, optical devices, and biosensors.