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Nanoemulsion-based silver ion-selective optode based on colorimetrically silver ion-responsive ionic liquid-based

Shuto Oka1, Kenji Sueyoshi1, Tatsuro Endo1

  • 1Department of Applied Chemistry, Graduate School of Engineering, Osaka Metropolitan University, 1-1 Gakuen-cho, Naka-ku, Sakai, Osaka, 599-8531, Japan.

Analytical Sciences : the International Journal of the Japan Society for Analytical Chemistry
|April 12, 2023
PubMed
Summary
This summary is machine-generated.

This study introduces a fast-responsive nanoemulsion (NE)-based optode for silver ion (Ag+) detection. The novel ionic liquid-based dye (ILD) in NE offers rapid, highly sensitive, and selective Ag+ sensing for on-site analysis.

Keywords:
Cation exchangeIonic liquidNanoemulsionOptical sensorOptodeSilver ion sensor

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Area of Science:

  • Analytical Chemistry
  • Materials Science
  • Nanotechnology

Background:

  • Conventional poly(vinyl chloride) (PVC) membrane-based ion-selective optodes using ionic liquid-based dyes (ILDs) exhibit slow response times for silver ion (Ag+) sensing, particularly at high concentrations.
  • The slow response is attributed to the dye converting from a liquid to a solid form during Ag+ detection, hindering diffusion.
  • Nanoemulsification (NE) offers a potential solution to overcome these limitations due to its large surface area and enhanced diffusivity.

Purpose of the Study:

  • To develop a fast-responsive nanoemulsion (NE)-based optode for selective silver ion (Ag+) detection.
  • To overcome the slow response time associated with traditional ILD-based PVC membranes.
  • To enhance the sensitivity and selectivity of Ag+ sensing using a novel ILD-based NE.

Main Methods:

  • Fabrication of a silver ion (Ag+)-selective optode utilizing a fast-responsive nanoemulsion (NE) incorporating an ionic liquid-based dye (ILD).
  • The ILD consists of a cationic merocyanine dye (KD-M13-H+) and an anionic Ag+ ionophore (BDM-SO3-).
  • Characterization of the NE-based optode's response time, sensitivity, selectivity, and application in real sample analysis (tap water).

Main Results:

  • The ILD-based NE exhibited a significantly shorter response time (1 second) compared to ILD-based PVC membranes (minutes).
  • The NE demonstrated approximately 12 times higher sensitivity than conventional plasticizer-based NEs, with a high dye concentration (833 mmol kg-1).
  • Highly selective Ag+ sensing was achieved via a cation-exchange mechanism (log K = -3.0), with successful application to tap water samples (98-103% recovery, <5% RSD).

Conclusions:

  • The novel ILD-based NE provides a highly sensitive, rapid, and selective method for silver ion (Ag+) sensing.
  • The nanoemulsification technique effectively addresses the slow response issue of ILD-based optodes.
  • This ILD-based NE holds significant potential for developing high-performance on-site analytical devices for Ag+ detection.