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Properties of Enantiomers and Optical Activity02:24

Properties of Enantiomers and Optical Activity

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It is essential to understand the difference between chiral and achiral interactions and the implications thereof in optical activity and their applications. Just as our feet, which are chiral, interact uniquely with chiral objects, such as a pair of shoes, but identically with achiral socks, enantiomers of a molecule exhibit different properties only when they interact with other chiral media. An example of a significant implication from this facet is the phenomenon known as optical activity,...
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Related Experiment Video

Updated: Jun 25, 2025

An Electrochemical Cholesteric Liquid Crystalline Device for Quick and Low-Voltage Color Modulation
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An Electrochemical Cholesteric Liquid Crystalline Device for Quick and Low-Voltage Color Modulation

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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.

Journal of Colloid and Interface Science
|May 30, 2024
PubMed
Summary

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.